Expression painter:arcto(x1,y1,x2,y2,r) appends an arc of a circle to the current path defined by the radius r and two tangent lines current point (x0,y0) to (x1,y1) and from (x1,y1) to (x2,y2).

When the current point is set, a line segment joins the current point to the first endpoint of the arc. The second endpoint becomes the new current point.

See also: PostScript operators arct and arcto.