Custom Watchface Reference Document

This page is for designers of new Watchfaces. It will list all the keywords and features available when you want to create or animate a new watchface.

Custom Watchface Format

Custom Watchface is an open format designed for AAPS and associated to the new «AAPS (Custom)» watchface available on Watch.

The Watchface file is a simple zip file, but to be recognized as a Watchface file, the zip file must contain the following files:

• One image file named CustomWatchface (can be bitmap files CustomWatchface.jpg, CustomWatchface.png or a vector CustomWatchface.svg). This file is the little icon used to select the watchface when you click on «Load Watchface» button, and also the image visible within AAPS Wear plugin.

• One file named CustomWatchface.json (see JSON structure below). This second file is the core file that will include all information required to design the watchface. This json file must be valid (it’s probably the most tricky point when you edit manually this file within a text editor, because an missing or additional comma is enough to break the json format). This JSON file must also include a "metadata" bloc with a "name" key with not empty value. This will be the name of your custom watchface (see Metadata settings below)

• the size of this zip should be as small as possible (less than about 500kb). If this file is too big, it will just be blocked and not transmitted to the watch.

The zip file can also contain some additional resource files:

• Hardcoded file names for images that will be used used in standard views included in the watchface (like Background, CoverChart… see List of hardcoded resource files below). All these files can be either jpg, png or svg format. but for most of them, you will have to use png or svg that manage transparency (jpg are smaller in size compared to png, but with no transparency). Note that the best quality associated to the smallest size will generally be with svg files (vector format).

• Addtional resource files with free names. These additional files can be either image files, or font files (ttf and otf format are accepted for fonts). Note that for these additional files, the filename (without extension) will be used as the keyValue, within JSON file, to specify where or when these files should be used.

  • image files are often used as background of text views or for dynamic animation (like battery level from 0% to 100%)

  • font files allow you to use dedicated fonts within your watchface

JSON Structure

JSON files can be edited in Notepad (or notepad++) text editor (prefer notepad++ that recognize JSON and use color formating)

• it contains string keys "string_key": and key values that can be strings like "key value", integer, boolean like trueor false or block of data.

• each value is seperated by a comma ,

• A block of data starts by { and ends by }

• the json file is a whole block so it starts by { and ends by }, and inside this file all embeded blocks are associated to a "key" that should be unique within the block

• To improve readibility of json file, it’s generally indented (each new key is on a new line, each new block is shifted on the right by 4 spaces characters)

Metadata Settings

This block is the first block included into the json file and is mandatory. It contains all the informations associated to this watchface, like the name, the author, the date of creation or update, the author version or the plugin version.

See below an example of metadata block:

"metadata": {
    "name": "Default Watchface",
    "author": "myName",
    "created_at": "07\/10\/2023",
    "author_version": "1.0",
    "cwf_version": "1.0",
    "comment": "Default watchface, you can click on EXPORT WATCHFACE button to generate a template"
},

Note that / used for the date is a special character, so to be recognize correctly within json file, you have to put before an «escape» character \

You can see in some json file an additional key "filename", this key will be automatically created or updated when the custom watchface will be loaded within AAPS (it will be used to show to the user the zip filename within exports folder), so you can remove this key within metadata block.

General parameter settings

After the first block with metadata, you will set some general parameters (see List of general parameters below), this allow you to set Graph colors (Carbs, Bolus, BG values…), and also default colors for value in range, hyper or hypo (default colors of BG value and arrows)

See below an example of general parameters

"highColor": "#FFFF00",
"midColor": "#00FF00",
"lowColor": "#FF0000",
"lowBatColor": "#E53935",
"carbColor": "#FB8C00",
"basalBackgroundColor": "#0000FF",
"basalCenterColor": "#64B5F6",
"gridColor": "#FFFFFF",
"pointSize": 2,
"enableSecond": true,

ImageView settings

Custom image can be tuned using correct filename associated to each ImageView included into custom watchface Layout, then the json block is only here to define the position, the size, if the view is visible or not, and optionally tune the color:

See below an example of an Image block for second_hand, (in this case there are no image included into zip file so default second hand image will be used, but tuned with a custom color.

"second_hand": {
    "width": 400,
    "height": 400,
    "topmargin": 0,
    "leftmargin": 0,
    "visibility": "visible",
    "color": "#BC906A"
}

To have second_hand colored with default BG color (lowRange, midRange or highRange), you just have to modify the latest ligne with the keyValue bgColor

    "color": "bgColor"

TextView settings

TexView have more available parameters compare to ImageView: you can tune rotation (integer value in degrees), textsize (integer value in pixel), gravity (to define if text value will be centered (default value), or aligned left or right), set the font, fontStyle and fontColor, and also background color of the TextView

"basalRate": {
    "width": 91,
    "height": 32,
    "topmargin": 133,
    "leftmargin": 249,
    "rotation": 0,
    "visibility": "visible",
    "textsize": 23,
    "gravity": "center",
    "font": "default",
    "fontStyle": "bold",
    "fontColor": "#BDBDBD"
},

Note that if you don’t want to manage one view within your watchface, then put the "visibility" key to "gone" but also set size and position outside visible area like that:

"second": {
    "width": 0,
    "height": 0,
    "topmargin": 0,
    "leftmargin": 0,
    "rotation": 0,
    "visibility": "gone",
    "textsize": 46,
    "gravity": "center",
    "font": "default",
    "fontStyle": "bold",
    "fontColor": "#BDBDBD"
},

If size and position are within visible area, you can get some «flash» of the hidden value during the refresh of the watchface.

If you want to customize background image of a text view, then you can use the key "background": and put the filename of image included into zip file as keyValue, you can also just change the background color using "color:" key.

"background": "fileName"

You also have 4 specific textViews (named freetext1 to freetext4) that have a specific parameter "textvalue": that can be used to set for example a label

ChartView settings

Chart view is a very specific view that can share some parameters with ImageView or with TextView…

Standard settings for this view is very simple:

"chart": {
    "width": 400,
    "height": 170,
    "topmargin": 230,
    "leftmargin": 0,
    "visibility": "visible"
},

The 2 additional parameters you can include for Chart view is a background color (default is transparent), using "color" key or a background image using "background" key.

How to build/design your first Watchface

Tools required

• Text editor: my advice is to use NotePad++ (or equivalent) that is a simple text editor, but added value is you can see formated text with color code, so it’s easier to detect errors. any simple text editor do the jod. it will be used to tune json informations

• Image editor (bitmap and/or vector)

  • If you use Bitmap

    • Image editor should be able to manage transparency (required for all image above background), and png format (if you used bitmap image)

    • Background image can be in jpg format (smaller that png)

    • Image editor should allow you to measure in pixel graphical objects (can be a simple square) (top, left, width, heigth)

    • Image editor should be able to show you colors with RRVVBB code in hexadecimal

    • Image editor should be able to resize image to 400px x 400px (very important to work with this resolution)

  • If you use Vector

    • Vector image should be exported in svg format

Get template to not start from scratch

When you want to design your first watchface, the best is to start by the default watchface (this will ensure you to have latest version with all available views correctly sorted)

• You can get zip file by clicking on «Export Template» button within Wear plugin and get zip file within AAPS/exports folder

• Note that you will need to have a watch connected to AAPS to see Custom Watchface buttons (but watch is also required to check, test and tune your custom watchface)

Default watchface is very simple and zip file will contains only the 2 files:

• CustomWatchface.png (image of default watchface for WF selection)

• CustomWatchface.json

Organize your files within your computer

The easiest way to work is to have phone connected to the computer, and work with to specific folders:

• one explorer opened on a specific folder that will have all files (json, bitmap images, vector images, fonts), and the CustomWatchface.zip file within it

• another explorer (or navigation tree tuned) opened to have Phone/AAPS/exports folder available

That way working is very easy: each time you tune json file with a text editor, image with image editor (bitmap or vector) you have to just:

1. save your modifications in each app

2. drag and drop all files within CustomWatchface.zip file

3. drag and drop CustomWatchface.zip into AAPS/exports folder of the phone

4. send CustomWatchface to the watch to check the results

Initialize Watchface customization

First step you will have to define a watchface Name (necessary to select it easily for testing), and start to tune metadata keys at the begining of json file

Then you will have to define which information you want to show so which view should be visible or hidden.

• will you manage second or not?

• do you want to design an analog watch or a digital watch (or both…)

Now you can start to modify json file with the "visibility": key of each view set to "visible" or "gone" (if you want to keep or not the view)

You can also start to tune approximativaly top, left margin and width heigth values to start organizing the watchface (these values will be tuned later using image editor)

Note: everything is design within a 400px x 400px rectangle. So everything will be position in absolute coordinates within this size.

When you design your first watchface, you have to know that everything is organized by layer from the Back to the Top, so each view (ImageView or TextView) can hide something that is behind…

Then within json file all views are sorted from the Back to the Top (this will help you to remember what is behind what…)

If you design or tune your first custom watchface, start by simple things: change visibility of some views, include a dedicated background image without changing json file…

Manage colors

Within json file, you will have several keys to specify colors: "color", "fontColor"for views, but also "highColor", "midColor", "lowColor", … (see List of General Parameters)

Colors are specified with a text field that starts by # followed by RRGGBB (Red, Green, Blue) values in hexadecimal format:

• "#FFFFFF" is white, and "#000000" is black, "#FF0000" is red…

You can also include 2 additional values for alpha layer and specify a transparency level (AARRGGBB):

• "#00000000"is completly transparent, and "#FF000000" is completly opaque ( so "#FF000000" is equivalent to "#000000")

You can also use the specific keyvalue "bgColor" to automatically use "highColor", "midColor", "lowColor" specified in general parameters according to BG Value:

• "fontColor": "bgColor", will automatically set the font color of the view according to BG Value

• Note that sgv (for BG Value) and direction (for trend arrow) views automatically apply BG colors set into general parameters (for these 2 views, if you want to have different colors, you will have to use advanced dynData feature with one step color…)

For more information concerning ImageViews and "color": key, see dedicated chapter Tune image color below.

Include Hardcoded images

the easiest way to start tuning your watchface is to include within zip file some images with a specific names (see List of Hardcoded resource files)

• Image should be in .jpg, .png or .svg format. but be carefull, jpg doesn’t manage transparency, so should be only used for background layer. For all intermediate layers (cover_chart, cover_plate, hands) use eather .pngor .svg image

• If you have a vector image editor (like for example Illustrator), prefer this format that will produce small text files with .svg extension the best quality.

• You should take care to use exact filename (including High/lower case)

Now if you want a dedicated backgoung image, you only have to include within the zip file a file named Background.jpg (without changing anything else. send zip file into the watch and check result!.

If you want to customize hour_hand, minute_hand or second_hand for an analog watch, simply include HourHand.png (or HourHand.svg), MinuteHand.png and SecondHand.png.

• these images will automatically rotate around the center of the image, so the images should be set to 00:00:00 (and for a «full frame» analog watch, use a size of 400 x 400 px positioned at top 0 left 0)

You can also noticed within List of Hardcoded resource files that for each image view, you have two additional hardcoded filenames High and Low (for example you can include other images named BackgroundHigh.jpg and BackgroundLow.jpg within zip file). then image will automatically change according to you BG level (within Range, Hyper or Hypo). See AIMICO watchface as example.

Tune image color

"color" key can be used to tune default image color:

• applied on background view, it will set the background color (default black)

• applied on cover_plate (simple dial) or hands, it will change the default image (white) by the color specified (including "bgColor")

When you apply "color" key on a bitmap image (.jpg or .png), color will apply an interresting effect on color saturation. So you will still recognize your bitmap.

Finally on .svg image file, "color"key will have no effect, consider color of vector files as hardcoded within the image. If you want to change colors, you will have to include several svg files, and use advanced dynData feature to change it

Use additional fonts for TextViews

Several defaults font are already available within wear apk (see font keys included into key values chapter). But if you want to use additional fonts not available as default, you can include addtional fonts within zip file:

• the 2 accepted font format are .ttf and .otf files

• if you include a custom font within zip file, for example with a file named myCustomFont.ttf, then you will have to use the filename to use it within json file for a TextView:

"font": "myCustomFont",

Keep in mind that some fonts can be included into big files (and you are limited to a maximum size for zip file). So if you only use very few characters (numbers, ., ,), you can use free tools to remove unused characters (for example here) and then reduce font size.

Advanced features

Preferences Feature

CustomWatchface can automatically tune some watch preferences to have the correct visualization of the watchface (if authorization is given within Wear preferencesby the user).

But this feature should be used with care. Preferences are common with all other watchfaces. So several rules to respect with this feature:

• never set preferences concerning hidden views

• try to maximize the visible views

• feel free to oversize the width of certain views:

  • TBR can be shown as percentage (small width, but also as absolue values much wider)

  • delta or avg delta with detailed information can be wide

  • same for iob2: this view can have total iob, but if detailed iob is selected, then text size can be very long

If you still need some very specific settings to have a correct display (in example below, if there is not enough space for detailed iob, you can «force» this parameter to false of your watch, you can include within metadata block some settings constraint like that

"metadata": {
    "name": "Default Watchface",
    "author": "myName",
    "created_at": "07\/10\/2023",
    "author_version": "1.0",
    "cwf_version": "1.0",
    "comment": "Default watchface, you can click on EXPORT WATCHFACE button to generate a template",
    "key_show_detailed_iob": false
},

If user authorize custom watchface to modify watch parameter (setting within wear plugin) then Show detailed iob will be set to «disable», and locked to disable (no modification of this parameter possible, until authorization is disabled within wear plugin parameter, or another watchface is selected)

• Note that when a user select a watchface, he can see the number of «required parameter» during watchface selection

In example below Gota watchface has one required parameter. If authorization is not given it will be shown in white color, but authorization is given, then this parameter will be set and locked on the watch (in this case the number is in orange color)

TwinView Feature

Twin views provide an easy way to adjust the view position based on the visible views. This does not have the power of a layout entirely made up of LinearLayout, but can handle many common cases.

In example below you can see AAPS (Cockpit) watchface with all views visible within settings, and the same watchface with «Show rig battery» disabled and «Show avg delta» disabled

You can see that when one of the twin views is hidden, the other is shifted to be centered

in this example, you can see that within "uploader_battery" block, we have "twinView": key is added to define "rig_battery" view, and in "rig_battery" block "twinView": key define "uploader_battery" as twin. Then then additional key "leftOffsetTwinHidden": define the number of pixel to shift the view when twin is hidden.

To calculate this number, you can see that the difference between the leftMargin of each of the twin views is 50 pixels, so the offset to stay centered is half in one direction or the other.

If the twin views are positioned vertically, in this case you must use the key "topOffsetTwinHidden":

"uploader_battery": {
    "width": 49,
    "height": 30,
    "topmargin": 354,
    "leftmargin": 150,
    "rotation": 0,
    "visibility": "visible",
    "textsize": 23,
    "gravity": "center",
    "font": "roboto_condensed_bold",
    "fontStyle": "bold",
    "fontColor": "#FFFFFF",
    "twinView": "rig_battery",
    "leftOffsetTwinHidden": 25
},
"rig_battery": {
    "width": 49,
    "height": 30,
    "topmargin": 354,
    "leftmargin": 200,
    "rotation": 0,
    "visibility": "visible",
    "textsize": 23,
    "gravity": "center",
    "font": "roboto_condensed_bold",
    "fontStyle": "bold",
    "fontColor": "#FFFFFF",
    "twinView": "uploader_battery",
    "leftOffsetTwinHidden": -25
},

DynData Feature

DynData is the most powerfull feature if you want to include some animation within you watchface, according to some internal values (like BG value, BG level, delta, % of battery… see list of available data here)

To illustrate this feature, I will take the example of AAPS (SteamPunk) watchface:

In this watchface, we will have to manage the rotation of BG value (from 30 degrees to 330 degrees) on the right, the dynamic range of avg_delta (scale up to 5mgdl, 10mgdl or 20mgdl according to value), the rotation of pointer that should be synchronized to the scale, and also the different layer of the views…

To be able to manage this Watchface, see below all the images included into the zip file:

Note: to be able to see the transparency, all these images are on a yellow background and surrounded by a red square

• On the first row, Background.jpg and CoverPlate.png will be automatically mapped with associated view (default views filename), and steampunk_pointer.png will be managed by dynData

• On the second row you see the 3 scales of dynamic range for avg_delta that will also be managed by dynData

• On the third row, chartBackground.jpg will be linked manually within chart view, HourHand.png and finally MinuteHand.png files will be automatically mapped with associated views

Background management

First, concerning BG value image, no choice here, it can only be in the background layer (otherwize it will be in front of the chart view and chart will not be visible!). So we will have to map BG value to the background, and then rotate background image according to BG value.

Within "background" block, we will include 2 dedicated keys to make this rotation:

"background": {
    "width": 400,
    "height": 400,
    "topmargin": 0,
    "leftmargin": 0,
    "dynData": "rotateSgv",
    "rotationOffset": true,
    "visibility": "visible"
},

"dynData": key will define which block should be used to define the animation (value, range, convertion…) here this block was named «rotateSgv» (choose an explicit name when you use this feature),

"rotationOffset": true, will define that the expected animation according to value should be a rotation. (others available keys are "leftOffset" and "topOffset" if you want to create a slider)

Now we will go at the end of the file, after the last view:

"second_hand": {
    "width": 120,
    "height": 120,
    "topmargin": 140,
    "leftmargin": 140,
    "visibility": "gone"
},
"dynData": {
    "rotateSgv": {
        "valueKey": "sgv",
        "minData": 30,
        "maxData": 330
    },

You can see that after the latest view ("second_hand"), we added a new "dynData": { ... } block that will contains all the animations:

The block defined within "background"view was named "rotateSgv", it’s the first block you will find into "dynData"!

This block is simple: you have a first key named "valueKey": that will be used to define which value should be used. in this case "sgv" is a «keyValue» that defines BG value (note that in most cases the keyValue has the same name that the view that shows this information).

Concerning BG value, default min data is set to 39mgdl and max data is set to 400mgdl (see DynData reference key values below all available keyValues and associated min/max data values).

Within "rotateSgv" block the two additional keys ("minData": and "maxData":) will be used to tune min and max data to 30 and 330. With these min and max values, we will be able to directly use data value (without any convertion) to rotate background in degrees. In this situation all BG values above 330mgdl will be limited to 330, upper limit of the image.

Chart management

Default background of chart is transparent, so to hide BG scale included into background image, we will need to include a dedicated background image (this image will include the overall shadows of Steampunk watchface). The link to charBackground.jpg file is done with "background": key

Of course, the sizing and positioning of the view must be done to the pixel!

"chart": {
    "width": 216,
    "height": 107,
    "topmargin": 280,
    "leftmargin": 80,
    "visibility": "visible",
    "background": "chartBackground"
},

Avg delta management

To be able to manage dynamic range of avg delta, we will use the four freetext views. freetext1 will be used to manage the image scale, and freetext2 to freetext4 will be used to manage pointer rotation according to scale.

freetext1

As explain before, freetext views are in front of chart and in front of background, that’s why we included transparent area to see these images (right side and bottom side of the image)

Note that the removed bottom part of these images has been used as background of chart to have a perfect integration.

"freetext1": {
    "width": 400,
    "height": 400,
    "topmargin": 0,
    "leftmargin": 0,
    "rotation": 0,
    "visibility": "visible",
    "dynData": "avgDeltaBackground"
},

For this view we include the link to another "dynData"block named avgDeltaBackground. This block will manage avgDelta scale according to avgDelta value.

"avgDeltaBackground": {
    "valueKey": "avg_delta",
    "minData": -20,
    "maxData": 20,
    "invalidImage": "steampunk_gauge_mgdl_5",
    "image1": "steampunk_gauge_mgdl_20",
    "image2": "steampunk_gauge_mgdl_20",
    "image3": "steampunk_gauge_mgdl_10",
    "image4": "steampunk_gauge_mgdl_5",
    "image5": "steampunk_gauge_mgdl_5",
    "image6": "steampunk_gauge_mgdl_10",
    "image7": "steampunk_gauge_mgdl_20",
    "image8": "steampunk_gauge_mgdl_20"
},

• "valueKey": will make the link with "avg_delta" value

• min and max Data will also limit the range to the maximum value available within this watchface (from -20mgdl to 20mgdl). For mmol users, keep in mind that all internal values are always in mgdl within AAPS.

Then we will see here how to manage dynamic background image according to value.

"invalidImage": is the key to manage image to show when we have an invalid data (or missing data). Here we make the link to additional resource image including into zip file with 5 mgdl scale

Then we will use a serie of images, starting from "image1": to "image8":. The number of provided images will define the number of steps between minData and maxData.

• image1 will define image to show when avg_delta is equal or close to minData and the image with the highest number (here image8) will be used to define the image that should be shown when avg_delta is equal or close to maxData

• between -20mgdl and 20mgdl, the overall range is 40mgdl, devided by 8 (number of images provided), we will have 8 steps of 5mgdl

• Now we can map background images according to avg_delta value, starting from the lowest values: between -20 and -15, and also between -15 and -10 we will use steampunk_gauge_mgdl_20 for the scale, then between -10 and -5 steampunk_gauge_mgdl_10, and so on until +15 and +20 where we will again use steampunk_gauge_mgdl_20 background image

freetext2 to freetext4

For these views will will combine dynamic images and rotation feature explained before:

"freetext2": {
    "width": 276,
    "height": 276,
    "topmargin": 64,
    "leftmargin": 64,
    "rotation": 0,
    "visibility": "visible",
    "dynData": "avgDelta5",
    "rotationOffset": true
},
"freetext3": {
    "width": 276,
    "height": 276,
    "topmargin": 64,
    "leftmargin": 64,
    "rotation": 0,
    "visibility": "visible",
    "dynData": "avgDelta10",
    "rotationOffset": true
},
"freetext4": {
    "width": 276,
    "height": 276,
    "topmargin": 64,
    "leftmargin": 64,
    "rotation": 0,
    "visibility": "visible",
    "dynData": "avgDelta20",
    "rotationOffset": true
},

Here each view is dedicated to a specific scale (so is linked to a dedicated dynData block), you can alos notice that "rotationOffset": key is enabled for these 3 views.Now take a look on the first dynData block:

"avgDelta5": {
    "valueKey": "avg_delta",
    "minData": -20,
    "maxData": 20,
    "rotationOffset": {
        "minValue": -120,
        "maxValue": 120
    },
    "invalidImage": "null",
    "image1": "null",
    "image2": "null",
    "image3": "null",
    "image4": "steampunk_pointer",
    "image5": "steampunk_pointer",
    "image6": "null",
    "image7": "null",
    "image8": "null"
},

Here, even if dynamic range will be used only between -5 and +5 avg_delta datas, it’s important to keep the overall range of -20, +20mgdl to ensure that the pointer will be synchronize with the background during scale switches. That’s why we keep the same overall range than for avgDeltaBackground and the same number ot steps (8 images).

You can note that either "invalidImage" or several "imagexx" are with "null" key value (it could be any string not existing as a filename within zip file). When a filename is not found, then view background image will be transparent. So the setting ensure that pointer will only be visible for step 4 and step 5 (avg delta between -5mgdl and +5 mgdl), and will not be visible outside this range.

Now we can see a new block "rotationOffset": that will have inside two keys "minValue": and "maxValue":. These values are used to make the convertion between internal datas (in mgdl), and the angle rotation we want to have.

• Steampunk watchface is designed to have maximum from -30 degrees to 30 degrees rotation for the pointer. So according to the scale (here from -5mgdl to 5mgdl), we will want to have 30 degrees for these values. Because minData and maxDataare 4 times greater, then the corresponding minValues and maxValues are 4 * 30 degrees so -120 and +120 degrees. But for all rotation above or below +-30 degrees the pointer will be hidden (no image visible), and the pointer will only be visible for values between -5 and +5mgdl… So it’s exactly what is expected here.

The other dynData blocks are defined the same way to tune "avgDelt10"and "avgDelta20"

loop view

in Steampunk watchface loop green and red arrows (for status) are disabled, this is also managed with a dedicated dynData block associated to loop view.

    "loopArrows": {
        "invalidImage": "greyArrows",
        "image1": "greenArrows",
        "image2": "redArrows"
    }

Because this block is only called by loop View, and default data managed by this view is loop information, then "valueKey": key is optional.

Default minData and maxData for loop are defined to 0min and 28min, so with two images, all data values below 14 min will be shown with background image1 and all data values above 14 min will be shown with image2. 14 min is exactly the threshold to switch from green arrow to red arrow.

In this example, greyArrows, greenArrows and redArrows files are not included into zip file, so these arrows are just removed (invisible), but you can use this block «as is» if you want to tune status arrows with custom background images.

rig_battery and uploader_battery views

To finish the overview of dynData feature, we will take a look on battery management. The idea here is to customize text color according to battery level (from 0 to 100%)

"uploader_battery": {
    "width": 60,
    "height": 28,
    "topmargin": 100,
    "leftmargin": 170,
    "rotation": 0,
    "visibility": "visible",
    "textsize": 20,
    "gravity": "center",
    "font": "default",
    "fontStyle": "bold",
    "fontColor": "#00000000",
    "dynData": "batteryIcons",
    "twinView": "rig_battery",
    "topOffsetTwinHidden": -13
},
"rig_battery": {
    "width": 60,
    "height": 28,
    "topmargin": 74,
    "leftmargin": 170,
    "rotation": 0,
    "visibility": "visible",
    "textsize": 20,
    "gravity": "center",
    "font": "default",
    "fontStyle": "bold",
    "fontColor": "#00000000",
    "dynData": "batteryIcons",
    "twinView": "uploader_battery",
    "topOffsetTwinHidden": 13
},

You can see here that these both views share the same dynData block named batteryIcons. It’s possible because by default attached data is the one of the view (to without specifying a "valueKey": key within batteryIcons block, it will be applied with uploader_battery data or rig_battery data according to the view).

Note these two views also use TwinView feature explain here.

Now lets take a look on dynData block:

"batteryIcons": {
    "invalidFontColor": "#00000000",
    "fontColor1": "#A00000",
    "fontColor2": "#000000",
    "fontColor3": "#000000",
    "fontColor4": "#000000",
    "fontColor5": "#000000"        
},

Here we use exactly the same logic that for dynamic background image, but with dedicated keys ("invalidFontColor" and "fontColor1" to "fontColor5" to specify 5 steps of 20% each one).

• "fontColor1" (dark red) will be used for all values below 20%, and white will be used for all values above this threshold.

• If you want to lower the threshold to «below 10%», you just have to add 5 additional keys from "fontColor6" to "fontColor10" , but you can also adjust each color if you want progressive variation from green to yellow, orange and red…

DynPref Feature

Before reading this chapter, you have to understand how dynData works, because DynPref is an advanced usage of DynData: You will now be able to adjust each DynData block according to preferences set by the user:

To illustrate DynPref feature, we will use two example:

• Steampunk watchface (simple use to include into the same watchface mgdl and mmol version, watchface will automatically switch according to unit selected into aaps).

• AAPS V2 watchface will combine different preferences to be able to manage text color and background according to dark and match divider preferences.

Simple usage of dynPref within Steampunk watchface

Within Steampunk, we have to set of images according to units: background image that will have BG scale and will turn according to BG value. and freeText1 that contains dynamic scale according to avgDelta value.To be able to have one watchface that will automatically show correct units, we should select image according to unit selected.

To do that we will replace dynData key by a dynPrefkey within view block:

 "background": {
    "width": 400,
    "height": 400,
    "topmargin": 0,
    "leftmargin": 0,
    "dynPref": "rotateSgv",
    "rotationOffset": true,
    "visibility": "visible"
},

Usage of dynPrefkeys will be very close to dynDatakeys explained in previous chapter

Now we will take a look at the end of the json file, after dynData block:

"dynData": {
    ...
},
"dynPref": {
    "rotateSgv": {
        "prefKey": "key_units",
        "true": {
            "valueKey": "sgv",
            "minData": 30,
            "maxData": 330,
            "invalidImage": "Background_mgdl",
            "image1": "Background_mgdl"
        },
        "false": {
            "valueKey": "sgv",
            "minData": 30,
            "maxData": 330,
            "invalidImage": "Background_mmol",
            "image1": "Background_mmol"
        }
    },
    ...
}

You can see that the dynpref key defined within background view block ("dynPref": "rotateSgv") exists into the dynPref json block included at the end of json file:

This block should contains a "prefKey"key that will define which preference should be used. In this example the key "key_units" is linked to units selected within AAPS on phone, and value is "true"if selected unit is mgdl, "false"if selected unit is mmol.

Then you will find two json blocks that will use «dynData» format, and that will be used according to selected preference

Note that the «HardCoded» file name for Background image is now replaced by a dynamic image that will be the same wathever the BG value (Background_mgdl.pngfile if key_units is «true», Background_mmol.png if key_units is false), and we also include an `»invalidImage» key to allways have a background image even if no data has been received from the phone.

Combine different preferences within dynPref with AAPS V2

Most of the time, when you set a preference, it’s not to get «dynamic behaviour», but only the results according to what you select, but within dynPref, it’s considered as a dynamic feature…

• when in dynDatayou specify one full block of parameters (with images, fontColor, Color, …), with dynPref, you will be able to combine each parameter according to one specific preference.

• Here we will see how match devider preference will be associated to dark preference to show when it’s enabled (true) white text on black background on dark watchface (dark parameter true) or black text on white background on light watchface (dark false)…

First lets see the beginning of json file:

"dynPrefColor": "prefColorDark",
"pointSize": 2,
"enableSecond": false,
"background": {
    "width": 400,
    "height": 400,
    "topmargin": 0,
    "leftmargin": 0,
    "visibility": "visible",
    "dynPref": "dark"
},

"dynPrefColor": "prefColorDark" will specify the dynPref block of all default colors outside views. These colors will be tuned according to dark parameter within "prefColorDark":

And at the end, within the dynPref block, you will have a specific dynPref block for default colors:

"prefColorDark": {
    "prefKey": "key_dark",
    "true": {
        "highColor": "#FFFF00",
        "midColor": "#00FF00",
        "lowColor": "#FF0000",
        "lowBatColor": "#E53935",
        "carbColor": "#FB8C00",
        "basalBackgroundColor": "#0000FF",
        "basalCenterColor": "#64B5F6",
        "gridColor": "#FFFFFF"
    },
    "false": {
        "highColor": "#A0A000",
        "midColor": "#00A000",
        "lowColor": "#A00000",
        "lowBatColor": "#E53935",
        "carbColor": "#D07C00",
        "basalBackgroundColor": "#0000A0",
        "basalCenterColor": "#64B5F6",
        "gridColor": "#303030"
    }
}

The difference between this dynPref block and the other standard dynPref blocks used for views is that here you don’t have a dynData block for each value of "key_dark" parameter, but only the list of main colors (highColor, midColor , …)

Lets now take a look on items included into the «divider banner» (in example below "basalRate" view linked to "matchDivider" dynPref view:

"basalRate": {
    "width": 90,
    "height": 32,
    "topmargin": 127,
    "leftmargin": 242,
    "rotation": 0,
    ...
    "leftOffsetTwinHidden": 33,
    "dynPref": "matchDivider"
},

Then within dynPref block, you can see that Match divider parameter (key_match_divider key), include the 2 blocks «true» and «false», but these two blocs are only used to define that view will use either «dark» dynBlock (so exactly the same background and text color than the otherviews outside the banner), or «white» dynBLock that will set opposite colors for background and text…

"matchDivider": {
    "prefKey": "key_match_divider",
    "true": {
        "dynPref": "dark"
    },
    "false": {
        "dynPref": "white"
    }
},
"dark": {
    "prefKey": "key_dark",
    "true": {
        "color1": "#000000",
        "fontColor1": "#FFFFFF"
    },
    "false": {
        "color1": "#FFFFFF",
        "fontColor1": "#000000"
    }
},

Note that here you are within a «dynData» block, then to define a color or a fontColor, you will use a dynData (not specified here), and a single step ("color1" and 'fontColor1' are used)

• for all parameter other than image default «invalid value (if not set specifically by "invalidColor" key or "invalidFontColor" keys) will be "color1" and "fontColor1".

Then we will see a third example with iob views (iob1 and iob2), where we will use smaller text for detailled iob and bigger text for total iob:

"iob1": {
    "width": 125,
    "height": 33,
    "topmargin": 168,
    "leftmargin": 275,
    "rotation": 0,
    "visibility": "visible",
    "textsize": 19,
    ...
    "dynPref": "prefIob1"
},
"iob2": {
    "width": 125,
    "height": 33,
    "topmargin": 196,
    "leftmargin": 275,
    "rotation": 0,
    "visibility": "visible",
    "textsize": 24,
    ...
    "leftOffsetTwinHidden": -10,
    "dynPref": "prefIob2"
},

You will see within default view settings the text size (19 on iob1 and 24 on iob2) and the two different dynPref block that should tune textsize (according to detailed iob parameter), and colors (according to dark parameter)

"prefIob1": {
    "prefKey": "key_show_detailed_iob",
    "true": {
        "dynPref": "dark",
        "textsize1": 24
    },
    "false": {
        "dynPref": "dark"
    }
},
"prefIob2": {
    "prefKey": "key_show_detailed_iob",
    "true": {
        "dynPref": "dark",
        "textsize1": 19
    },
    "false": {
        "dynPref": "dark"
    }
},

You can see here that according to detailed iob parameter ("key_show_detailed_iob" key), when it’s «true» then textsize is defined to a fix value bigger than default (24 instead of 19): this is done using textsize «step» feature, within only one value so one step… (note that for all parameter others than images,if invalidTextSize is not set, then textsize1 will be used for invalid data)

Then «dark» dynPref block will be used to set colorand fontColor

In this example the dynData block that will be used for iob1 view will be if detailed IOB is enabled and dark enabled:

{
    "color1": "#000000",
    "fontColor1": "#FFFFFF",
    "textsize1": 24
},

So the text will be inwhite on black background and the size 24 will replace default size of 19 set into the view

The dynData block that will be used for the same view iob1 if detailed IOB is disabled and dark disabled will be:

{
    "color1": "#FFFFFF",
    "fontColor1": "#000000"
},

Now the text will be in black on white background with a size of 19

Tips and tricks for dynPref

• You can combine as many pref than you want, but be carefull, the number of blocks to describe can increase very fast (it’s exponential): if you chain 3 parameters and you want to define all situations, you will have 8 blocks to describe, if each parameter has only 2 values…

• Be carefull to not build «infinite loop» (for example if dynpref1 block should be completed by dynpref2 block that should be completed by dynpref1 block…). In this case the dynpref blocks will be considered as invalid…

• Do not forget to include the numéric index after the key (when you use for example "textsize"key within a view, you will have to use "textsize1"within the dynPref value block, because it’s a «dynData» format, so linked to value with a single step in this case)

• Only one key "valueKey" should be set for one view, so if the final dynData block is built from several dynPrefblocks, do not include several "valueKey" (and associated "minData", "maxData", …)

Key and KeyValue reference

List of Metadata keys

List of Standard information metadata keys

Key	Comment
name	Name of custom watchface
author	Name or pseudo of the author(s)
created_at	Creation (or update) date, be carefull / is a special character, so if you use it for the date put \before
cwf_version	Watchface plugin compatible with the design of your watchface
author_version	The author can specify here the version of his watchface
comment	Free text that can be used to give some information or limitation of current watchface

Preference keys

Key	Comment and
key_show_detailed_iob	true will lock detailed IOB data on view iob2, then iob1 (if visible and not replaced by an icon) will show iob total. false will lock total iob on iob2view. can be used if the width of iob2is too small to show correctly detailed iob
key_show_detailed_delta	false (only if design is not compatible with the width of detailed delta for deltaand avg_delta views)
key_show_bgi	true if your design requires bgi information
key_show_iob	true if your design requires iob1 or iob2views
key_show_cob	true if your design requires cob1 or cob2views
key_show_delta	true if your design requires delta information
key_show_avg_delta	true if your design requires avg_delta information
key_show_uploader_battery	true if your design requires uploader_battery (phone battery) information
key_show_rig_battery	true if your design requires rig_battery information
key_show_temp_basal	true if your design requires basalRate information
key_show_direction	true if your design requires direction information (BG variation arrows)
key_show_ago	true if your design requires timestamp information (minutes ago for last received BG)
key_show_bg	true if your design requires sgv information (BG value)
key_show_loop_status	true if your design requires loop information (loop status and ago)
key_show_week_number	true if your design requires week_number information (loop status and ago)
key_show_date	true if your design requires Date, Month or Day of the week information

Internal keys

Key	Comment and
filename	This key will be created (or updated) automatically when the watchface is loaded and will contains local zip filename within exports folder
cwf_authorization	this key will be created (when the watchface is loaded) and updated each time authorization preference is changed in Wear settings, and it will be used to synchronize authorization to watch

List of General parameters

Key	Comment
highColor	"#FFFF00"(default Yellow): Color of BG value, trend arrows and bg value in graph if bg is above upper limit (Hyper)
midColor	"#00FF00"(default Green): Color of BG value, trend arrows and bg value in graph if bg is within range
lowColor	"#FF0000"(default Red): Color of BG value, trend arrows and bg value in graph if bg is below lower limit (Hypo)
lowBatColor	"#E53935"(default Dark Red): Color of uploader_battery when value is low (below 20% tbc)
carbColor	"#FB8C00"(default Orange): Color of Carbs points within graph
basalBackgroundColor	"#0000FF"(default Dark blue): Color of TBR curve within graph
basalCenterColor	"#64B5F6"(default Light blue): Color of Bolus or SMB points within graph
gridColor	"#FFFFFF"(default White): Color of lines and text scale within graph
pointSize	2 (default): size of points in graph (1 for small point, 2 for big points)
enableSecond	false (default): specify if watchface will manage seconds or not within time, second or second_hand views. it’s important to be consistent between view visibility and this overall setting that will allow update every second of time information
dayNameFormat	«E» (default): from «E» to «EEEE» specify dayname format (number, short name, full name) tbc
monthFormat	«MMM» (default): from «M» to «MMMM» specify month format (number, short name, full name)

List of HardCoded resource files

For most images, High and Low suffix allow tuning of image according to BG level (in Range, Hyper or Hypo)

Filenames	Comment
CustomWatchface	Image shown for watchface selection and within Wear plugin
Background, BackgroundHigh, BackgroundLow	none (default black): Background image. background is allways visible and default color is black if no image provided. Color can be modified to fit watchface design
CoverChart, CoverChartHigh, CoverChartLow	none (default): Image in front of Chart (transparency should be available to see Chart behind) Can be used to limit boundaries of graph
CoverPlate, CoverPlateHigh, CoverPlateLow	simple dial (default): image in front of all text values. transparency mandatory to see all values that are behind
HourHand, HourHandHigh, HourHandLow	hour_hand (default): image of hour hand. a default image is provided and can be colored to fit analog design. Note axis for rotation will be the center of the image
MinuteHand, MinuteHandHigh, MinuteHandLow	minute_hand (default): image of minute hand. a default image is provided and can be colored to fit analog design. Note axis for rotation will be the center of the image
SecondHand, SecondHandHigh, SecondHandLow	second_hand (default): image of second hand. a default image is provided and can be colored to fit analog design. Note axis for rotation will be the center of the image
ArrowNone	?? (default): image shown when no valid arrow is available.
ArrowDoubleUp	↑↑ (default): image of double arrow up
ArrowSingleUp	↑ (default): image of single arrow up
Arrow45Up	↗ (default): image of fortyfive arrow up
ArrowFlat	→ (default): image of flat arrow
Arrow45Down	↘ (default): image of fortyfive arrow down
ArrowSingleDown	↓ (default): image of single arrow down
ArrowDoubleDown	↓↓ (default): image of double arrow down

For each above filenames, extension can be either .jpg, .png or .svg. But be carefull, .jpgdoesn’t manage transparency (so most of the files should be with .png or .svg to not hide view that are behind…)

List of View keys

This list is sorted from background to foreground this is very important when you organize your watchface to know this order because some image or text can be hidden by other images

Key	Type of view	Data attached	DynData Key
background	Image View
chart	Specific Chart View	Graphical curves
cover_chart	Image View
freetext1	Text View
freetext2	Text View
freetext3	Text View
freetext4	Text View
iob1	Text View	IOB label or IOB Total
iob2	Text View	IOB Total or IOB Detailed
cob1	Text View	Carb label
cob2	Text View	COB Value
delta	Text View	Short delta (5 min)	delta
avg_delta	Text View	Avg Delta (15 min)	avg_delta
uploader_battery	Text View	phone battery level (%)	uploader_battery
rig_battery	Text View	rig battery level (%)	rig_battery
basalRate	Text View	% or absolute value
bgi	Text View	mgdl/(5 min) or mmol/(5 min)
time	Text View	HH:MM or HH:MM:SS
hour	Text View	HH
minute	Text View	MM
second	Text View	SS
timePeriod	Text View	AM or PM
day_name	Text View	name of the day (cf. dayNameFormat)	day_name
day	Text View	DD date	day
week_number	Text View	(WW) week number	week_number
month	Text View	month name (cf. monthFormat)
loop	Text View	min ago since last run and status (color arrows in background), color arrows can be tuned with DynData	loop
direction	Image View	TrendArrows	direction
timestamp	Text View	integer (min ago)	timestamp
sgv	Text View	sgv value (mgdl or mmol)	sgv sgvLevel
cover_plate	Image View
hour_hand	Image View
minute_hand	Image View
second_hand	Image View

List of Json keys

Common keys

that can be used on all view types (Text View, image View, graph view)

Key	type	comment / value
width	int	width of view in pixel
height	int	heigth of view in pixel
topmargin	int	top margin in pixel
leftmargin	int	left margin in pixel
rotation	int	rotation angle in degrees
visibility	string	see key value table
dynData	string	key block name that will specify dynamic data to link and associated animation (colors, image, shift, rotation) "dynData": "customName", (see below )
leftOffset	boolean	include this key with key value true to enable horizontal shift (positive or negative value) due to dynData value
topOffset	boolean	include this key with key value true to enable vertical shift (positive or negative value) due to dynData value
rotationOffset	boolean	include this key with key value true to enable rotation (positive or negative value) due to dynData value
twinView	string	key of the other view (generally the other view also include the twinView parameter with the key of this view in it)
topOffsetTwinHidden	int	number of pixel to shift view position vertically if twin view is hidden (positive or negative value) topOffsetTwinHidden = (topOffset twinView - topOffset thisView)/2
leftOffsetTwinHidden	int	number of pixel to shift view position horizontally if twin view is hidden (positive or negative value) leftOffsetTwinHidden= (leftOffset twinView - leftOffset thisView)/2
dynPref	string	key block name that will specify dynamic pref to link and associated animation (colors, image, shift, rotation) "dynPref": "customName", (see below )

TextView keys

Key	type	comment
textsize	int	size of font in pixel (keep in mind that font can include top and bottom margin so the real text size will generally be smaller than the number of pixel set). Note that size should be smaller than view heigth to not be truncated
gravity	string	see key value table
font	string	see key value table for available fonts. Can also be font filename (without extension) for fonts included into zip file
fontStyle	string	see key value table
fontColor	string	Manage color of the font "#RRVVBB": color code in RVB format, hexdecimal values #FF0000 is red "#AARRVVBB": AA include Alpha information (transparency), 00 is transparent, FF is opaque "bgColor": keyValue bgColor is an easy way to use highColor, midColor or lowColor according to BG value
allCaps	boolean	true if you want text in uppercase (mainly day name or month name)
background	string	resource_filename you can include a resource image as background of the text view (resource file will be resized to fit heigth and width of text view, but keeping image ratio). text value will be in front of background image. - Note that this key can also be used for chart view to set a custom background to the chart, infront of background image
color	string	Manage the color of view Background or tune color of image (if bitmap only) "#RRVVBB": color code in RVB format, hexdecimal values #FF0000 is red "#AARRVVBB": AA include Alpha information (transparency), 00 is transparent, FF is opaque "bgColor": keyValue bgColor is an easy way to use highColor, midColor or lowColor according to BG value - For default embeded image (hand, dial) color will be applied directly, for bitmap image (jpg or png) this will apply a saturation gradient filter on imagae - For svg this parameter will have no effect (color of svg files cannot be modified) - Note that this key can also be used for chart view to set a custom background to the chart, infront of background image
textvalue	string	Key specific to the 4 free text views included into the layout (from freetext1 to freetext4), this allow you to set the text that should be included (can be a label, or just : if you want to add a separator between hour view and minute view…)

ImageView keys

Key	type	comment
color	string	Manage the color of view Background or tune color of image (if bitmap only) "#RRVVBB": color code in RVB format, hexdecimal values #FF0000 is red "#AARRVVBB": AA include Alpha information (transparency), 00 is transparent, FF is opaque "bgColor": keyValue bgColor is an easy way to use highColor, midColor or lowColor according to BG value - For default embeded image (hand, dial) color will be applied directly, for bitmap image (jpg or png) this will apply a saturation gradient filter on imagae - For svg this parameter will have no effect (color of svg files cannot be modified) - Note that this key can also be used for chart view to set a custom background to the chart, infront of background image

ChartView keys

Key	type	comment
color	string	Manage the color of view Background or tune color of image (if bitmap only) "#RRVVBB": color code in RVB format, hexdecimal values #FF0000 is red "#AARRVVBB": AA include Alpha information (transparency), 00 is transparent, FF is opaque "bgColor": keyValue bgColor is an easy way to use highColor, midColor or lowColor according to BG value - For default embeded image (hand, dial) color will be applied directly, for bitmap image (jpg or png) this will apply a saturation gradient filter on imagae - For svg this parameter will have no effect (color of svg files cannot be modified) - Note that this key can also be used for chart view to set a custom background to the chart, infront of background image
background	string	resource_filename you can include a resource image as background of the text view (resource file will be resized to fit heigth and width of text view, but keeping image ratio). text value will be in front of background image. - Note that this key can also be used for chart view to set a custom background to the chart, infront of background image

Key values

Key value	key	comment
gone	visibility	view hidden
visible	visibility	view visible in watchface (but visibility can be enable or disable in parameters)
center	gravity	text is vertical and horizontal centered into the view
left	gravity	text is vertical centered but left aligned into the view
right	gravity	text is vertical centered but right aligned into the view
sans_serif	font
default	font
default_bold	font
monospace	font
serif	font
roboto_condensed_bold	font
roboto_condensed_light	font
roboto_condensed_regular	font
roboto_slab_light	font
normal	fontStyle
bold	fontStyle
bold_italic	fontStyle
italic	fontStyle

DynData keys

Key	type	comment
dynData	block	define the block of all dynamic data blocks that will be used for the views. generally after the last view. All the keys defined within this block will be used as key Value within view block: "dynData": { dynData blocks } and each block is defined by a custom name and several keys inside: "customName": { one dynData block }
valueKey	string	name of dynamic data to use (generally same that associated view key). If not existing, the default will be the values used for the view that uses this block. for example you can define one block to customize battery level percentage without specifying valueKey, and then use the same block to customize uploader_battery and rig_battery
minData	int	specify the minimum value to take into account for AAPS data : for example if value is sgv (unit mgdl internaly), if minData is set to 50, all bg values below 50mgdl will be set to 50. - Note that minData and maxData will be used to calculate dynamic values (in pixel or in degrees).
maxData	int	specify the maximum value to take into account for AAPS data : for example if value is sgv (unit mgdl internaly), if maxData is set to 330, all bg values above 330mgdl will be set to 330.
leftOffset	block	Specify the horizontal shift of the view according to min and max values in pixels. - It includes minValue key, maxValueKey and invalidValue key (optional) - If data is below or equal minData, then the view will be shifted to minValue pixels, and if data is above or equal to maxData, then the view will be shifted to maxValue pixels Note that to apply this shift leftOffset should be set to true within the view
topOffset	block	Specify the vertical shift of the view according to min and max values in pixels. - It includes minValue key, maxValueKey and invalidValue key (optional) - If data is below or equal minData, then the view will be shifted to minValue pixels, and if data is above or equal to maxData, then the view will be shifted to maxValue pixels Note that to apply this shift topOffset should be set to true within the view
rotationOffset	block	Specify the rotation angle in degrees of the view according to min and max values in pixels. - It includes minValue key, maxValueKey and invalidValue key (optional) - If data is below or equal minData, then the view will rotate by minValue degrees, and if data is above or equal to maxData, then the view will rotate by maxValue degrees Note that to apply this rotation, rotationOffset should be set to true within the view
minValue	int	result value to apply to the view (key only applicable within a leftOffset, topOffset or rotationOffset block)
maxValue	int	result value to apply to the view (key only applicable within a leftOffset, topOffset or rotationOffset block)
invalidValue	int	result value to apply to the view if data is invalid (key only applicable within a leftOffset, topOffset or rotationOffset block)
invalidImage	string	resource_filename to use for the ImageView or background TextView if the data is invalid
image1_to_n	string	resource_filename image to use for each step between minData (or close to minData) with image1 and maxData (or close to maxData) with imagen If for example your put 5 images (from image1 to image5), the range between minData and maxData will be divided in 5 steps and according to data value, the corresponding image will be shown
invalidFontColor	string	Manage fontColor steps if the data is invalid "#RRVVBB" or "#AARRVVBB": Color to use if an invalid data is received (can be transparent if AA=00)
fontColor1_to_n	string	Manage fontColor steps "#RRVVBB" or "#AARRVVBB": color to use for each step between minData (or close to minData) with fontColor1 and maxData (or close to maxData) with fontColorn
invalidColor	string	Manage background color or image color steps if the data is invalid "#RRVVBB" or "#AARRVVBB": Color to use if an invalid data is received (can be transparent if AA=00)
color1_to_n	string	Manage background color or image Color steps "#RRVVBB" or "#AARRVVBB": color to use for each step between minData (or close to minData) with color1 and maxData (or close to maxData) with colorn
invalidTextSize	int	Manage text size steps if the data is invalid
textsize1_to_n	int	Manage text size to use for each step between minData (or close to minData) with textsize1 and maxData (or close to maxData) with textsizen
invalidLeftOffset	int	Manage leftOffset steps if the data is invalid
leftOffset1_to_n	int	Manage leftOffset to use for each step between minData (or close to minData) with leftOffset1 and maxData (or close to maxData) with leftOffsetn Note, can be used with dynPref to shift a view when another is hidden…
invalidTopOffset	int	Manage topOffset steps if the data is invalid
topOffset1_to_n	int	Manage topOffset to use for each step between minData (or close to minData) with topOffset1 and maxData (or close to maxData) with topOffsetn Note, can be used with dynPref to shift a view when another is hidden…
invalidRotationOffset	int	Manage rotationOffset steps if the data is invalid
rotationOffset1_to_n	int	Manage rotationOffset to use for each step between minData (or close to minData) with rotationOffset1 and maxData (or close to maxData) with rotationOffsetn

DynData key values

Key value	key	comment
sgv	valueKey	default minData = 39 mgdl default maxData = 400 mgdl - Note that real maxData is linked to your sensor and units are always in mgdl for internal values
sgvLevel	valueKey	default minData = -1 (Hypo) default maxData = 1 (Hyper) if BG is within Range = 0
direction	valueKey	default minData = 1 (double Down) default maxValue = 7 (double Up) flat arrow data = 4 Error or missing data = 0 (??)
delta	valueKey	default minData = -25 mgdl default maxData = 25 mgdl - Note that real min and maxData can be above, and units are always mgdl for internal values
avg_delta	valueKey	default minData = -25 mgdl default maxData = 25 mgdl - Note that real min and maxData can be above, and units are always mgdl for internal values
uploader_battery	valueKey	default minData = 0 % default maxData = 100%
rig_battery	valueKey	default minData = 0 % default maxData = 100%
timestamp	valueKey	default minData = 0 min default maxData = 60 min
loop	valueKey	default minData = 0 min default maxData = 28 min - Note that status arrows are in green below 14 min and in red above 14 min so if you put 2 images, you can replace status background with your custom images with default min and maxData
day	valueKey	default minData = 1 default maxData = 31
day_name	valueKey	default minData = 1 default maxData = 7
month	valueKey	default minData = 1 default maxData = 12
week_number	valueKey	default minData = 1 default maxData = 53

DynPref keys

Key	type	comment
dynPref	block	define the block of all dynamic preference blocks that will be used for the views. Generally after the last view or after the dynData block. All the keys defined within this block will be used as key Value within view block: "dynPref": { dynPref blocks } and each block is defined by a custom name and several keys inside: "customName": { one dynPref block }
dynPref	string	Within a view Block name of dynamic dynPref block to use (generally same that associated view key or associated preference).
dynPref	string	Within a partial dynData Block included into a dynPref Block name of dynamic dynPref block to use to complete the dynData block. This allow you to tune a dynData block according to several preferences
dynPrefColor	string	this key is specific to the main block with all main colors (highColor, midColor, lowColor, graph colors…). you will use it if you want to tune main colors according to preferences
prefKey	string	specify the preference key Value that will be used to get user preferences (see PrefKey values below). This key should be used within a dynPref block. Then according to preference key, the dynPrefblock should contains as many keys than prefKey has values. Note that most of the time preferences are «Boolean» so you should find within the dynPref block these two dynData blocks: "true": { dynData Block }, "false": { dynData Block }
true	block	most preferences will set a boolean "true" or "false". You will specify the dynData block to use if preference selected by user is true. Note that if the block also contains a "dynPref":key, the dynData block wil be merged with other block. This allow you to tune for example color according to one preference, and textsize according to another preference
false	block	most preferences will set a boolean "true" or "false". You will specify the dynData block to use if preference selected by user is false. Note that if the block also contains a "dynPref":key, the dynData block wil be merged with other block. This allow you to tune for example color according to one preference, and textsize according to another preference

PrefKey values

All keys included into Preference keys chapter above can be used to tune view parameters

You can also you these additional key below included into AAPS (Custom) specific parameters:

Key	type	comment
key_units	boolean	true: if units selected on AAPS is mgdl false: if units selected on AAPS is mmol
key_dark	boolean	true: to use a dark background false: to use a light background Note: this parameter is often use into previous AAPS watchfaces (AAPS, AAPS V2…)
key_match_divider	boolean	true: divider included into AAPS, AAPS v2 watchfaces will not be visible false: divider included into AAPS, AAPS v2 watchfaces will be visible Note: this setting is often combine with dark preference (using dynPref key into dynDatablock) to set text color (and background) on the same or opposite color than dark parameter…