62 lines
1.4 KiB
Go
62 lines
1.4 KiB
Go
package pixel
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// Sprite is a drawable Picture. It's always anchored by the center of it's Picture.
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type Sprite struct {
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tri *TrianglesData
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d Drawer
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}
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// NewSprite creates a Sprite from the supplied Picture.
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func NewSprite(pic Picture) *Sprite {
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tri := MakeTrianglesData(6)
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s := &Sprite{
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tri: tri,
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d: Drawer{Triangles: tri},
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}
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s.SetPicture(pic)
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return s
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}
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// SetPicture changes the Sprite's Picture. The new Picture may have a different size, everything
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// works.
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func (s *Sprite) SetPicture(pic Picture) {
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oldPic := s.d.Picture
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s.d.Picture = pic
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if oldPic != nil && oldPic.Bounds() == pic.Bounds() {
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return
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}
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var (
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bounds = pic.Bounds()
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center = bounds.Center()
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horizontal = V(bounds.W()/2, 0)
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vertical = V(0, bounds.H()/2)
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)
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(*s.tri)[0].Position = -horizontal - vertical
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(*s.tri)[1].Position = +horizontal - vertical
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(*s.tri)[2].Position = +horizontal + vertical
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(*s.tri)[3].Position = -horizontal - vertical
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(*s.tri)[4].Position = +horizontal + vertical
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(*s.tri)[5].Position = -horizontal + vertical
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for i := range *s.tri {
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(*s.tri)[i].Color = NRGBA{1, 1, 1, 1}
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(*s.tri)[i].Picture = center + (*s.tri)[i].Position
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(*s.tri)[i].Intensity = 1
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}
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s.d.Dirty()
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}
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// Picture returns the current Sprite's Picture.
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func (s *Sprite) Picture() Picture {
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return s.d.Picture
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}
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// Draw draws the Sprite onto the provided Target.
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func (s *Sprite) Draw(t Target) {
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s.d.Draw(t)
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}
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