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); |
|---|
Parameter Value
| 参数 | 描述 |
|---|---|
| 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。 |