gg/ox/polygon.go

package ox

import (
	"surdeus.su/core/gg"
	"surdeus.su/core/gg/mx"
)

// Grouped triangles type.
type Polygon struct {
	ObjectImpl
	Transform
	mx.Triangles
}

func (p Polygon) GetContainedPoints(
	pts mx.Vectors,
) (mx.Vectors) {
	return p.MakeTriangles().
		GetContainedPoints(pts)
}

func (p Polygon) MakeTriangles() mx.Triangles {
	m := p.Transform.GetMatrice()
	ret := make(mx.Triangles, len(p.Triangles))
	for i, t := range p.Triangles {
		ret[i] = mx.Triangle{
			t[0].Apply(m),
			t[1].Apply(m),
			t[2].Apply(m),
		}
	}
	
	return ret
}

func (p Polygon) GetVertices() mx.Vectors {
	return p.MakeTriangles().GetVertices()
}

func (p Polygon) GetEdges() mx.Lines {
	return p.MakeTriangles().GetEdges()
}

var _ = gg.Drawer(&DrawablePolygon{})
// Polygon that can be drawn.
type DrawablePolygon struct {
	Polygon

	Drawity
}

func (p *DrawablePolygon) Draw(c gg.Context) *gg.Drawing {
	tri := &DrawableTriangles{}
	tri.Triangles = p.MakeTriangles()
	tri.Drawity = p.Drawity
	return tri.Draw(c)
}