59 lines
1.1 KiB
Go
59 lines
1.1 KiB
Go
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package geo
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import "fmt"
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type Box struct {
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TopLeft *Point
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Width float64
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Height float64
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}
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func NewBox(tl *Point, width, height float64) *Box {
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return &Box{
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TopLeft: tl,
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Width: width,
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Height: height,
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}
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}
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func (b *Box) Copy() *Box {
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if b == nil {
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return nil
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}
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return NewBox(b.TopLeft.Copy(), b.Width, b.Height)
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}
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func (b *Box) Center() *Point {
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return NewPoint(b.TopLeft.X+b.Width/2, b.TopLeft.Y+b.Height/2)
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}
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func (b *Box) Intersections(s Segment) []*Point {
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pts := []*Point{}
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tl := b.TopLeft
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tr := NewPoint(tl.X+b.Width, tl.Y)
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br := NewPoint(tr.X, tr.Y+b.Height)
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bl := NewPoint(tl.X, br.Y)
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if p := IntersectionPoint(s.Start, s.End, tl, tr); p != nil {
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pts = append(pts, p)
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}
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if p := IntersectionPoint(s.Start, s.End, tr, br); p != nil {
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pts = append(pts, p)
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}
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if p := IntersectionPoint(s.Start, s.End, br, bl); p != nil {
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pts = append(pts, p)
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}
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if p := IntersectionPoint(s.Start, s.End, bl, tl); p != nil {
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pts = append(pts, p)
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}
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return pts
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}
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func (b *Box) ToString() string {
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if b == nil {
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return ""
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}
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return fmt.Sprintf("{TopLeft: %s, Width: %.0f, Height: %.0f}", b.TopLeft.ToString(), b.Width, b.Height)
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}
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