_canvas") {
			context.fillStyle="#d64562";
		} else if(canvas_name == "interpolation_canvas") {
			context.fillStyle="#457fd6";
		} else if(canvas_name == "both_canvas") {
			if(i < ips)
				context.fillStyle="#457fd6";
			else
				context.fillStyle="#d64562";
		}
		context.beginPath();
		context.arc(points[i][0], points[i][1], 4, 0, 2*Math.PI);
		context.fill();
		context.closePath();
	}
}

// under
function reset_all_for_approximation() {
	points_for_approximation = [[37, 195], [66, 345], [197, 473], [42