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Create a pattern using HTML5 Canvas

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Sep 02, 2023 pm 02:57 PM

使用HTML5 Canvas创建一个图案

Create a pattern with HTML5 Canvas using the following method: createPattern(image, repetition)− This method will use an image to create a pattern. The second parameter can be a string with one of the following values: repeat, repeat-x, repeat-y, and no-repeat. If an empty string or null is specified, a duplicate will be assumed.

Example

You can try running the following code to see how to create a pattern -

<!DOCTYPE HTML>
<html>
   <head>
      <style>
         #test {
            width:100px;
            height:100px;
            margin: 0px auto;
         }
      </style>
      <script>
         function drawShape(){
            // get the canvas element using the DOM
            var canvas = document.getElementById(&#39;mycanvas&#39;);
           
            // Make sure we don&#39;t execute when canvas isn&#39;t supported
            if (canvas.getContext){
               // use getContext to use the canvas for drawing
               var ctx = canvas.getContext(&#39;2d&#39;);
               
               // create new image object to use as pattern
               var img = new Image();
               img.src = &#39;images/pattern.jpg&#39;;
               img.onload = function(){
                  // create pattern
                  var ptrn = ctx.createPattern(img,&#39;repeat&#39;);
                  ctx.fillStyle = ptrn;
                  ctx.fillRect(0,0,150,150);
               }
            } else {
               alert(&#39;You need Safari or Firefox 1.5+ to see this demo.&#39;);
            }
         }
      </script>
   </head>
   <body id = "test" onload = "drawShape();">
      <canvas id = "mycanvas"></canvas>
   </body>
</html>

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