HTML5 Game - Canvas Clip

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Introduction

We can use the clip method to clip a region.

Name DescriptionReturns
clip() Creates a new clipping region void

Once we define a clipping region, only paths that occur inside of the region are shown on the screen.

The example draws a rectangle that fills the canvas, creates a smaller clipping region and then draws another canvas-filling rectangle.

Only the part of the second rectangle which fits within the clipping region is drawn.

Demo

ResultView the demo in separate window 

<!DOCTYPE HTML>
<html>
    <head>
        <title>Example</title>
        <style>
            canvas {border: thin solid black}
            body > * {float:left;}
        </style>
    </head>
    <body>
        <canvas id="canvas" width="500" height="140">
            Your browser doesn't support the <code>canvas</code> element
        </canvas>
        <script>
            let ctx = document.getElementById("canvas").getContext("2d");

            ctx.fillStyle = "yellow";
            ctx.beginPath();/*from   w  ww.  j  av  a2s. c o m*/
            ctx.rect(0, 0, 500, 140);
            ctx.fill();

            ctx.beginPath();
            ctx.rect(100, 20, 300, 100);
            ctx.clip();
          
            ctx.fillStyle = "red";
            ctx.beginPath();
            ctx.rect(0, 0, 500, 140);
            ctx.fill();
          
        </script>
    </body>
</html>

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