共用方式為

strokeRect method

  • 發行項

Creates an outline of the specified rectangle on a canvas by using the current stroke, line width, and join styles.

 

Syntax

object.strokeRect(x, y, w, h);

Parameters

  • x [in]
    Type: number

    The x-coordinate, in pixels, of the upper-left corner of the rectangle in relation to the coordinates of the canvas.

  • y [in]
    Type: number

    The y-coordinate, in pixels, of the upper-left corner of the rectangle in relation to the coordinates of the canvas.

  • w [in]
    Type: number

    The width, in pixels, of the rectangle in relation to the coordinates of the canvas.

  • h [in]
    Type: number

    The height, in pixels, of the rectangle in relation to the coordinates of the canvas.

Return value

This method does not return a value.

Standards information

Remarks

The ICanvasRenderingContext2D::strokeRect method creates a path that requires the use of the ICanvasRenderingContext2D::stroke method to render the rectangle. The outline uses the current ICanvasRenderingContext2D::strokeStyle, ICanvasRenderingContext2D::lineWidth, ICanvasRenderingContext2D::lineJoin, and, when appropriate, ICanvasRenderingContext2D::miterLimit properties. If the w or h parameter is zero, a line is drawn. If the w and h parameters are zero, the rectangle is not drawn.