gistfile1.cs

		//does the actual coloring
		void DrawPoints (CGContext dctx)
		{
			dctx.BeginPath ();
			dctx.MoveTo (Points.First().X, Points.First().Y);
			dctx.SetLineWidth(swatchSlider.Value);
			dctx.SetBlendMode  (CGBlendMode.Normal);

			foreach (var crayon in Crayons) {
				if(crayon.Selected) {
					if (crayon.Name == "Eraser") {
						dctx.SetStrokeColor (1.0f, 1.0f, 1.0f, 1.0f);
					} else {
						dctx.SetStrokeColor (crayon.R / 255f, crayon.G / 255f, crayon.B / 255f, 1f);
					}
					dctx.SetLineCap (CGLineCap.Round);
				}
			}
			//set fill color with current crayons
			foreach (var point in Points) {
				dctx.AddLineToPoint(point.X, point.Y);
			}
			dctx.StrokePath();
		}