Example
Clear a rectangle within a given rectangle:
JavaScript:
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.fillStyle="red";
ctx.fillRect(0,0,300,150);
ctx.clearRect(20,20,100,50);
Try it Yourself »
Browser Support
The numbers in the table specify the first browser version that fully supports the method.
| Method | |||||
|---|---|---|---|---|---|
| clearRect() | Yes | 9.0 | Yes | Yes | Yes |
Definition and Usage
The clearRect() method clears the specified pixels within a given rectangle.
| JavaScript syntax: | context.clearRect(x,y,width,height); |
|---|
Parameter Values
| Parameter | Description | Play it |
|---|---|---|
| x | The x-coordinate of the upper-left corner of the rectangle to clear | Play it » |
| y | The y-coordinate of the upper-left corner of the rectangle to clear | Play it » |
| width | The width of the rectangle to clear, in pixels | Play it » |
| height | The height of the rectangle to clear, in pixels | Play it » |