HTML5 Game - Rotation and the Canvas state

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

Description

Rotation and the Canvas state

Demo

ResultView the demo in separate window 

<!DOCTYPE html>  
<html> 
<head> 
<style> 
#canvas { /*from   w  ww.  j  a v  a 2  s.  c  o  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'); 
    
      //draw black square 
      context.fillStyle = "black"; 
      context.fillRect(20,20,25,25); 

      //now draw a red square 
      context.setTransform(1,0,0,1,0,0); 
      let angleInRadians = 45 * Math.PI / 180; 
      context.rotate(angleInRadians); 
      context.fillStyle = "red"; 
      context.fillRect(100,100,50,50); 



</script> 



</body> 
</html>

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