Resource Icons is a Foundry VTT module that adds customizable icons to tokens to track resources.
Resource Icons are configured in the Resources tab of the Token Configuration window.
To activate an icon, select a resource for it to track. To deactivate an icon, select "None."
If no icon image is selected, the default icon image is a white circle.
The border, background, and tint of each icon can be individually set.
The border shape (circle/square), where the resource icons are anchored (above/below/left of/right of token), and icon alignemnt (inside/outside of token) can be changed in the module settings (per user with an option to use world default set by GM).
Resource Icons patches (via lib-wrapper) CONFIG.Token.objectClass.prototype.draw to implement resource icon drawing. This drawing is handled by a new method added to the Token object class: drawResourceIcons. This method adds three PIXI container children to the token. Each of these PIXI containers themselves are assigned three PIXI children (based on resource icon configuration): background (which encompasses border), icon image, and value text.
Resource Icons also patches CONFIG.Token.objectClass.prototype._onUpdate to handle changes to resource icon configuration (in which case drawResourceIcons is called to re-draw the icons) and to handle changes to resoure values when a token's actor is updated. This updated is handled by another new method added to the Token object class: updateResourceIconValues. This method simply changes the value text child of each PIXI container to the new value of the assigned resource.