Implements arc-to according to the HTML Canvas spec.
All coordinates are given relative to the current point.
This is the relative version of gsk.path_builder.PathBuilder.htmlArcTo.
X coordinate of first control point
Y coordinate of first control point
X coordinate of second control point
Y coordinate of second control point
Radius of the circle
Implements arc-to according to the HTML Canvas spec.
All coordinates are given relative to the current point.
This is the relative version of gsk.path_builder.PathBuilder.htmlArcTo.