private string ArcTo01(ICanvasRenderingContext2D ctx)
{
int x0 = 200, x1 = 250, x2 = 150, x3 = 200, y = 10, y3 = 80;
double y2 = 0.1;
int r = 10;
disc(ctx, x0, y, 4, "red");
disc(ctx, x1, y, 4, "red");
disc(ctx, x2, y + y2, 4, "red");
disc(ctx, x3, y3, 4, "green");
line(ctx, x0, y, x1, y, 1, "blue");
line(ctx, x1, y, x2, y + y2, 1, "blue");
ctx.lineWidth = 2;
ctx.strokeStyle = "black";
ctx.beginPath();
ctx.moveTo(x0, y);
ctx.arcTo(x1, y, x2, y + y2, r);
ctx.lineTo(x3, y3);
ctx.stroke();
return @"Originals\Shapes\ArcTo01.png";
}