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Returns an object that provides methods and properties for drawing and manipulating images and graphics on a canvas element in a document. A context object includes information about colors, line widths, fonts, and other graphic parameters that can be drawn on a canvas.
.png){kind=icon} .png){kind=icon} |
Syntax
CanvasRenderingContext2D retVal = object.getContext(contextId, contextAttribute);
Parameters
contextId [in]
Type: stringThe identifier (ID) of the type of canvas to create.
Internet Explorer 9 and Internet Explorer 10 support only a 2-D context using
canvas.getContext("2d");IE11 also supports 3-D or WebGL context using
canvas.getContext("experimental-webgl");contextAttribute [in, optional]
IE11 supports an optional set of WebGLContextAttributes for WebGL content. See getContextAttributes for more info.
Standards information
- The canvas element, Section 4.8.11
Remarks
The IHTMLCanvasElement::getContext method returns NULL if the contextId value is not supported.
Note A canvas object only supports one context. Additional calls to IHTMLCanvasElement::getContext this object return the same context.
Note If you are developing on an intranet and have rendering issues for HTML5, you can add a "meta http-equiv-'X-UA-Compatible' content= edge" to the <head> block of a webpage to force Windows Internet Explorer to use the latest standards. You shouldn't use this meta-tag for production webpages. For more information about document compatibility, see Defining Document Compatibility.