Canvas How to - Resize and crop image

Question

We would like to know how to resize and crop image.
Answer


<!--from   www.j ava2s  . c  o m-->
<!DOCTYPE html>

<html>
  <head>
    
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
    
    <script type="text/javascript">
      $(document).ready(function() {  
        var canvas = $("#myCanvas");
        var context = canvas.get(0).getContext("2d");
        
        /*
        var image = new Image();
        image.src = "http://www.java2s.com/style/download.png";
        $(image).load(function() {
          context.drawImage(image, 0, 0, 500, 333);
        });
        */
        /*
        var image = new Image();
        image.src = "http://www.java2s.com/style/download.png";
        $(image).load(function() {
          context.drawImage(image, 0, 0, 250, 250, 0, 0, 250, 250);
        });
        */
        
        /*
        var image = new Image();
        image.src = "http://www.java2s.com/style/download.png";
        $(image).load(function() {
          context.drawImage(image, 0, 0, 250, 250, 0, 0, 500, 500);
        });
        */
        
        
        // Cropping an image will affect shadows
        context.shadowBlur = 20;
        context.shadowColor = "rgb(0, 0, 0)";
        
        var image = new Image();
        image.src = "http://www.java2s.com/style/download.png";
        $(image).load(function() {
          //context.drawImage(image, 0, 0, 250, 250, 50, 50, 250, 250);
          
          // Shadows will show if you don't crop the image
          context.drawImage(image, 50, 50, 300, 200);
        });
        
      });
    </script>
  </head>
  
  <body>
    <canvas id="myCanvas" width="500" height="500">
      <!-- Insert fallback content here -->
    </canvas>
  </body>
</html>
The code above is rendered as follows: