Sprites are small raster images that are drawn on top of Viewports by a ViewDecoration. Their purpose is to draw the user's attention to something of importance.
There are two classes in the Sprites subsystem: Sprite (a Sprite image) and SpriteLocation. Sprite are the images that define the way a type of sprite looks and are generally loaded one time and saved for the rest of a session. A SpriteLocation defines the current position of a single Sprite in a Viewport.
A SpriteLocation can be either active or inactive. It becomes active by specifying a location (an x,y point) and a Sprite to draw at that point. A Sprite can be used many times by many SpriteLocations and a single SpriteLocation can change both position and which Sprite is shown at that position over time.
|constructor(src: ImageSource | string): Sprite||construct a Sprite from an ImageSource or a Url|
|image||undefined | HTMLImageElement||The image for this Sprite.|
|isLoaded Accessor ReadOnly||boolean||Whether this sprite has be successfully loaded.|
|loadPromise||Promise<HTMLImageElement>||Promise fulfilled when this sprite is loaded.|
|offset Accessor ReadOnly||Point2d||The offset to the middle of this Sprite.|
|size||Point2d||The size of this Sprite.|
Last Updated: 20 September, 2019