5, sharp(y2s(0)));
			context.lineTo(w - 20.5, sharp(y2s(0)));
			context.moveTo(sharp(x2s(0)), h - 20.5);
			context.lineTo(sharp(x2s(0)), 20.5);
			context.stroke();
			context.closePath();

			context.beginPath();
			context.setLineDash([3, 2]);
			context.moveTo(20.5, sharp(y2s(0)));
			context.lineTo(-0.5, sharp(y2s(0)));
			context.moveTo(w - 20.5, sharp(y2s(0)));
			context.lineTo(w + 0.5, sharp(y2s(0)));
			context.moveTo(sharp(x2s(0)), h - 20.5);
			context.lineTo(sharp(x2s(0)), h + 0.5);
			contex