HTML5 Game - Rotating a spaceship

Description

Rotating a spaceship
Demo

<!doctype html>
<html lang="en">
<body>
<div style="position: absolute; top: 50px; left: 50px;">
<canvas id="canvas" width="200" height="200">
 Your browser does not support the HTML 5 Canvas. 
</canvas>/*from  ww  w  .j a va2 s.  co  m*/
<script type="text/javascript">
  let theCanvas = document.getElementById('canvas');
    let context = theCanvas.getContext('2d');
  let rotation=0;
  let x=50;
  let y=50;

  function drawScreen() {
    // draw background and text 
    context.fillStyle = '#000000';
      context.fillRect(0, 0, 200, 200);
    
    //transformation
    let angleInRadians = rotation * Math.PI / 180;
    context.save(); //save current state in stack 
    context.setTransform(1,0,0,1,0,0); // reset to identity
    
    //translate the canvas origin to the center of the player
    context.translate(x,y);
    context.rotate(angleInRadians);

    //drawShip
    context.strokeStyle = '#ffffff';
    context.beginPath();
    context.moveTo(10,0); 
    context.lineTo(19,19);
    context.lineTo(10,9);
    context.moveTo(9,9); 
    context.lineTo(0,19);
    context.lineTo(9,0);
    
    
    context.stroke();
    context.closePath();
    
    //restore context
    context.restore(); //pop old state on to screen
    
    //add to rotation
    rotation++;
    

  }

  
  const FRAME_RATE=40;
  let intervalTime=1000/FRAME_RATE;
  gameLoop();
  
  function gameLoop() {
    drawScreen();
    window.setTimeout(gameLoop, intervalTime);
  }
  
</script> 

</div>
</body>
</html>
HTML5 Game - Rotating a spaceship

Description

Demo

Related Topic
