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DocumentationTencent Cloud Super App as a ServiceGuildlines for Mini Program DevelopmentAPICanvasCanvas
Canvas
Last updated: 2025-03-25 18:15:55
Attributes
Canvas Width: The breadth of the canvas.
Canvas Height: The vertical extent of the canvas.
Method Set
cancelAnimationFrame
The method is utilized as follows: Canvas.cancelAnimationFrame(number requestID)
Function Description: Cancels the animation frame request scheduled by requestAnimationFrame. It is compatible with both 2D Canvas and WebGL Canvas, however, it does not support the concurrent use of 2D and WebGL methods.
Parameters and Description: Number requestID.
createImageData
The method is utilized as follows: Image Canvas.createImage()
Function Description: Creates an ImageData object. Only supported in 2D Canvas.
Parameters and Description: Image.
createImage
The method is utilized as follows: ImageData Canvas.createImageData()
Function Description: Creates an image object. Supports use under 2D Canvas and WebGL Canvas, but does not support mixing 2D and WebGL methods.
Parameters and Description: ImageData.
createPath2D
The method is utilized as follows: Path2D Canvas.createPath2D(Path2D path)
Function Description: Creates a Path2D object.
Parameters and Description: Path2D path.
Return Value: Path2D.
getContext
Function Description: This method returns the drawing context of the Canvas.
Parameters and Description: string contextType, the context type.
Value | Note |
2d | 2D drawing context |
webgl | WebGL drawing context |
webgl2 | WebGL2 drawing context |
Return Value:RenderingContext, facilitating the acquisition of 2D and WebGL drawing contexts.
requestAnimationFrame
The method is utilized as follows: number Canvas.requestAnimationFrame(function callback)
Function Description: Executes upon the next redraw. Compatible with both 2D Canvas and WebGL Canvas, however, the methods of 2D and WebGL cannot be used interchangeably.
Parameters and Description: function callback, the callback to be executed.
Return Value: number, the request ID.
toDataURL
The method is employed as follows: string Canvas.toDataURL(string type, number encoderOptions)
Function Description: Returns a data URI that displays the image. The type parameter can be used to specify its format, with PNG as the default.
Parameters and Descriptions:
string type: The image format, default is image/png.
number encoderOptions: When the image format is specified as image/jpeg or image/webp, the image quality can be selected within the range of 0 to 1. If it exceeds the value range, the default value of 0.92 will be used. Other parameters will be disregarded.
Return Value: string.
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