HTML canvas rotate () method
Examples
Rotate the rectangle 20 degrees:
JavaScript:
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.rotate(20*Math.PI/180);
ctx.fillRect(50,20,100,50);
var ctx=c.getContext("2d");
ctx.rotate(20*Math.PI/180);
ctx.fillRect(50,20,100,50);
try it"
Browser Support
Internet Explorer 9, Firefox, Opera, Chrome and Safari support rotate () method.
Note: 8 and earlier versions of Internet Explorer do not support the <canvas> element.
Definition and Usage
rotate () method to rotate the current drawing.
Note: The rotation will only affect the drawing after the completion of the rotation.
JavaScript syntax: | context .rotate (angle); |
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Parameter Value
参数 | 描述 |
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angle | 旋转角度,以弧度计。 如需将角度转换为弧度,请使用degrees*Math.PI/180 公式进行计算。 实例:如需旋转 5 度,可规定下面的公式:5*Math.PI/180。 |
HTML canvas Reference Manual