title: Finding coordinates after canvas Rotation
body: <p>0 to 0,-70 by this :</p>
  
  <pre><code>ctx.strokeStyle = "red";
  ctx.lineWidth = 2;
  ctx.rotate(Math.PI/-10;);
  ctx.beginPath();
  ctx.moveTo(0,0); 
  ctx.lineTo(0,-70);
  ctx.stroke();
  </code></pre>
  
  <p>And I can rotate that by 'PI/-10', and that works.</p>
  
  <p>How i can get the x,y points of this after using rotate? </p>