code: func (dc *Context) ClosePath() {
  	if dc.hasCurrent {
  		dc.strokePath.Add1(dc.start.Fixed())
  		dc.fillPath.Add1(dc.start.Fixed())
  		dc.current = dc.start
  	}
  }
docs: // ClosePath adds a line segment from the current point to the beginning
  // of the current subpath. If there is no current point, this is a no-op.