Function isLoop

plotter/contour.go:287–291

isLoop returns true iff a vg.Path is a closed loop.

(p vg.Path)

// isLoop returns true iff a vg.Path is a closed loop.
func isLoop(p vg.Path) bool {
	s := p[0]
	e := p[len(p)-1]
	return s.Pos == e.Pos
}

// contourPaths returns a collection of vg.Paths describing contour lines based
// on the input data in m cut at the given levels. The trX and trY function