HTML canvas clearRect() Method

Introduction

Clear a rectangle within a given rectangle:

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<!DOCTYPE html>
<html>
<body>

<canvas id="myCanvas" width="300" height="180" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>

<script>
var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 400, 150);//from  ww w  .  j  ava 2s.  c om
ctx.clearRect(20, 20, 100, 50);
</script>

</body>
</html>

The clearRect() method clears the specified pixels within a given rectangle. 

context.clearRect(x, y, width, height);

Parameter Values

Parameter Description
x The x-coordinate of the upper-left corner of the rectangle to clear
y The y-coordinate of the upper-left corner of the rectangle to clear
width The width of the rectangle to clear, in pixels
heightThe height of the rectangle to clear, in pixels



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