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optimize Sprite

This commit is contained in:
faiface 2017-01-25 19:04:37 +01:00
parent bc97fa00b8
commit 16c1672c61
1 changed files with 19 additions and 11 deletions
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30
graphics.go
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@ -156,15 +156,25 @@ func (td *TrianglesDrawer) Append(t Triangles) {
// Sprite is a picture that can be drawn onto a Target. To change the position/rotation/scale of
// the Sprite, use Target's SetTransform method.
type Sprite struct {
td TrianglesDrawer
pic *Picture
td TrianglesDrawer
data *TrianglesData
pic *Picture
}
// NewSprite creates a Sprite with the supplied Picture. The dimensions of the returned Sprite match
// the dimensions of the Picture.
func NewSprite(pic *Picture) *Sprite {
data := &TrianglesData{
{Position: V(0, 0), Color: NRGBA{1, 1, 1, 1}, Texture: V(0, 0)},
{Position: V(0, 0), Color: NRGBA{1, 1, 1, 1}, Texture: V(1, 0)},
{Position: V(0, 0), Color: NRGBA{1, 1, 1, 1}, Texture: V(1, 1)},
{Position: V(0, 0), Color: NRGBA{1, 1, 1, 1}, Texture: V(0, 0)},
{Position: V(0, 0), Color: NRGBA{1, 1, 1, 1}, Texture: V(1, 1)},
{Position: V(0, 0), Color: NRGBA{1, 1, 1, 1}, Texture: V(0, 1)},
}
s := &Sprite{
td: TrianglesDrawer{Triangles: &TrianglesData{}},
td: TrianglesDrawer{Triangles: data},
data: data,
}
s.SetPicture(pic)
return s
@ -173,14 +183,12 @@ func NewSprite(pic *Picture) *Sprite {
// SetPicture changes the Picture of the Sprite and resizes it accordingly.
func (s *Sprite) SetPicture(pic *Picture) {
w, h := pic.Bounds().Size.XY()
s.td.Update(&TrianglesData{
{Position: V(0, 0), Color: NRGBA{1, 1, 1, 1}, Texture: V(0, 0)},
{Position: V(w, 0), Color: NRGBA{1, 1, 1, 1}, Texture: V(1, 0)},
{Position: V(w, h), Color: NRGBA{1, 1, 1, 1}, Texture: V(1, 1)},
{Position: V(0, 0), Color: NRGBA{1, 1, 1, 1}, Texture: V(0, 0)},
{Position: V(w, h), Color: NRGBA{1, 1, 1, 1}, Texture: V(1, 1)},
{Position: V(0, h), Color: NRGBA{1, 1, 1, 1}, Texture: V(0, 1)},
})
(*s.data)[0].Position = V(0, 0)
(*s.data)[2].Position = V(w, h)
(*s.data)[1].Position = V(w, 0)
(*s.data)[3].Position = V(0, 0)
(*s.data)[4].Position = V(w, h)
(*s.data)[5].Position = V(0, h)
s.pic = pic
}