Graph.prototype.drawEquationAnimated = function (equation, color, thickness) {
var context = this.context,
x = this.minX,
xi = x,
graph = this;

var step = function () {
xi += graph.iteration;
if (x <= graph.maxX) {
context.save();
context.save();
graph.transformContext();

context.beginPath();
context.moveTo(x, equation.call(null, x));
context.lineTo(xi, equation.call(null, xi));

context.restore();
context.lineJoin = "round";
context.lineWidth = thickness;
context.strokeStyle = color;
context.stroke();
context.restore();

// Increment x
x = xi;

setTimeout(step, 25);
}
}
setTimeout(step, 25);
};