HTML5 Game - Scale from the center point

  1. HOME
  2. HTML5 Game
  3. Canvas
  4. Scale

Description

Scale from the center point

Demo

ResultView the demo in separate window 

<!DOCTYPE html>  
<html> 
<head> 
<style> 
#canvas { /*from   w  ww .  j a v  a  2  s .  co m*/
  border:1px solid #03F; 
  background:#CFC; 
} 
</style> 
</head> 
<body> 
<canvas id="canvas" width="640" height="480"></canvas> 
<script> 
  let context = document.getElementById('canvas').getContext('2d'); 
          //now draw a red square 
      context.setTransform(1,0,0,1,0,0); 
      let x = 100; 
      let y = 100; 
      let width = 50; 
      let height = 50; 
      context.translate(x+.5*width, y+.5*height); 
      context.scale(2,2); 
      context.fillStyle = "red"; 
      context.fillRect(-.5*width,-.5*height , width, height); 


</script> 



</body> 
</html>

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