HTML canvas createLinearGradient () method
Examples
Definition from black to white gradient (left to right), a rectangle fill style:
JavaScript:
var ctx=c.getContext("2d");
var grd=ctx.createLinearGradient(0,0,170,0);
grd.addColorStop(0,"black");
grd.addColorStop(1,"white");
ctx.fillStyle=grd;
ctx.fillRect(20,20,150,100);
try it"
Browser Support
Internet Explorer 9, Firefox, Opera, Chrome and Safari support createLinearGradient () method.
Note: 8 and earlier versions of Internet Explorer do not support the <canvas> element.
Definition and Usage
createLinearGradient () method creates a linear gradient object.
Gradient can be used to fill rectangles, circles, lines, text, and so on.
Tip: Use this object as strokeStyle or fillStyle value of the property.
Tip: Use addColorStop () method specifies a different color, as well as where to locate the color gradient object.
| JavaScript syntax: | context .createLinearGradient (x0, y0, x1, y1); |
|---|
Parameter Value
| 参数 | 描述 |
|---|---|
| x0 | 渐变开始点的 x 坐标 |
| y0 | 渐变开始点的 y 坐标 |
| x1 | 渐变结束点的 x 坐标 |
| y1 | 渐变结束点的 y 坐标 |
More examples
Examples
Define a gradient (top to bottom) as a rectangle fill style:
JavaScript:
var ctx=c.getContext("2d");
var my_gradient=ctx.createLinearGradient(0,0,0,170);
my_gradient.addColorStop(0,"black");
my_gradient.addColorStop(1,"white");
ctx.fillStyle=my_gradient;
ctx.fillRect(20,20,150,100);
try it"
Examples
Define a from black to red and then to white gradient, a rectangle fill style:
JavaScript:
var ctx=c.getContext("2d");
var my_gradient=ctx.createLinearGradient(0,0,170,0);
my_gradient.addColorStop(0,"black");
my_gradient.addColorStop(0.5,"red");
my_gradient.addColorStop(1,"white");
ctx.fillStyle=my_gradient;
ctx.fillRect(20,20,150,100);
try it"
HTML canvas Reference Manual