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<!DOCTYPE html>
<html>
 <head>
 <style>
     #myCanvas {
         border: 1px solid black;
     }
 </style>
 <script>
   var canvas, ctx;
 
   function init() {
     // This function is called after the page is loaded
     // 1 - Get the canvas
     canvas = document.getElementById('myCanvas');
     // 2 - Get the context
     ctx=canvas.getContext('2d');
     // 3 - we can draw, try to change these values
     drawMonster(0, 0);
   }
   
   function drawMonster(x, y) {     
     // head
     ctx.fillStyle='lightgreen';
     ctx.fillRect(0,0,200,200);
     
     // eyes
     ctx.fillStyle='red';
     ctx.fillRect(35,30,20,20);
     ctx.fillRect(140,30,20,20);
     
     // interior of eye
     ctx.fillStyle='yellow';
     ctx.fillRect(43,37,10,10);
     ctx.fillRect(143,37,10,10);
     
     // Nose
     ctx.fillStyle='black';
     ctx.fillRect(90,70,20,80);
     
     // Mouth
     ctx.fillStyle='purple';
     ctx.fillRect(60,165,80,20);
     
     // coordinate system at (0, 0)
     drawArrow(ctx, 0, 0, 100, 0, 10, 'red');
     drawArrow(ctx, 0, 0, 0, 100, 10, 'red');
   }
 </script>
 </head>
<body onload="init();">
    <canvas id="myCanvas" width="400" height="400">
            Your browser does not support the canvas tag.
    </canvas>
</body>
</html>
 
// Borrowed and adapted from : http://stackoverflow.com/questions/808826/draw-arrow-on-canvas-tag
function drawArrow(ctx, fromx, fromy, tox, toy, arrowWidth, color){
  //variables to be used when creating the arrow
  var headlen = 10;
  var angle = Math.atan2(toy-fromy,tox-fromx);
​
  ctx.save();
  ctx.strokeStyle = color;
​
  //starting path of the arrow from the start square to the end square and drawing the stroke
  ctx.beginPath();
  ctx.moveTo(fromx, fromy);
  ctx.lineTo(tox, toy);
  ctx.lineWidth = arrowWidth;
  ctx.stroke();
​
  //starting a new path from the head of the arrow to one of the sides of the point
  ctx.beginPath();
  ctx.moveTo(tox, toy);
  ctx.lineTo(tox-headlen*Math.cos(angle-Math.PI/7),toy-headlen*Math.sin(angle-Math.PI/7));
​
  //path from the side point of the arrow, to the other side point
  ctx.lineTo(tox-headlen*Math.cos(angle+Math.PI/7),toy-headlen*Math.sin(angle+Math.PI/7));
​
  //path from the side point back to the tip of the arrow, and then again to the opposite side point
  ctx.lineTo(tox, toy);
  ctx.lineTo(tox-headlen*Math.cos(angle-Math.PI/7),toy-headlen*Math.sin(angle-Math.PI/7));
​
  //draws the paths created above
  ctx.stroke();
  ctx.restore();
}
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