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HTML5 canvas clearRect Method

HTML5 track Tag Reference HTML5 canvas reference

Example

Clear all pixels inside a 100*50 pixels rectangle:

Yor browser does not support the canvas tag.

JavaScript:

var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.fillStyle="red";
ctx.fillRect(0,0,300,150);
ctx.fillStyle="yellow";
ctx.fillRect(40,40,150,100);
ctx.strokeRect(30,10,150,100);
ctx.clearRect(20,20,100,50);

Try it yourself »

Definition and Usage

The clearRect method clears all pixels inside the specified rectangle.

The clearRect method takes four parameters (x,y,w,h).

The first two parameters represents the x and y coordinates of where to begin erasing in the canvas.

The last two parameters represents the size (width and height) of the erasing rectangle.

JavaScript syntax: context.clearRect(x,y,width,height);

Browser Support

Internet Explorer Firefox Opera Google Chrome Safari

The clearRect method is supported in all major browsers.

Parameter Values

Parameter Values Description Play it
x x-coordinate The canvas' x-coordinate of where to place the upperleft corner of the rectangle Play it »
y y-coordinate The canvas' y-coordinate of where to place the upperleft corner of the rectangle Play it »
width width The width of the rectangle, in pixels Play it »
height height The height of the rectangle, in pixels Play it »

HTML5 track Tag Reference HTML5 canvas reference

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