Source code file: Canvas/app/assets/javascripts/drawing.js:
draw = function( ) { c = document.getElementById("myCanvas"); ctx = c.getContext("2d"); ctx.fillStyle = "#FF0000"; ctx.fillRect(20,50,150,75); ctx.beginPath( ); ctx.arc(95, 50, 40, 0, 2 * Math.PI); ctx.stroke( ); ctx.font = "20px Arial"; ctx.fillText("JavaScript Art", 150, 20); }