HTML canvas createLinearGradient()Method
Canvas ObjectExample
Define a gradient from black to white (from left to right), as the fill style of the rectangle:
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);
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Browser Support
Internet Explorer 9, Firefox, Opera, Chrome, and Safari support the createLinearGradient() method.
Note:Internet Explorer 8 and earlier versions do not support the <canvas> element.
Definition and Usage
The createLinearGradient() method creates a linear gradient object.
Gradients can be used to fill rectangles, circles, lines, text, and so on.
Tip:Use this object as the value of thestrokeStyleorfillStylevalue of the property.
Tip:Use theaddColorStop()method to specify different colors and where to position colors in the gradient object.
| JavaScript Syntax: | context.createLinearGradient(x0,y0,x1,y1); |
|---|
Parameter Values
| Parameter | Description |
|---|---|
| x0 | The x-coordinate of the start point of the gradient |
| y0 | The y-coordinate of the start point of the gradient |
| x1 | The x-coordinate of the end point of the gradient |
| y1 | The y-coordinate of the end point of the gradient |
More Examples
Example
Define a gradient (from top to bottom) as the fill style of the rectangle:
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 Yourself »
Example
Define a gradient from black to red to white, as the fill style of the rectangle:
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);
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Other Extensions