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    Canvas

    Last updated: 2024-11-21 18:41:53
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      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.

      createPathe2D

      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

      The method is utilized as follows: RenderingContext Canvas.getContext(string contextType)
      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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