Implements arc-to according to the SVG spec.
A convenience function that implements the SVG arc_to
functionality.
After this, x, y will be the new current point.
X radius
Y radius
the rotation of the ellipsis
whether to add the large arc
whether to sweep in the positive direction
the X coordinate of the endpoint
the Y coordinate of the endpoint
Implements arc-to according to the SVG spec.
A convenience function that implements the SVG arc_to
functionality.
After this, x, y will be the new current point.