add Sprite.SetMatrix and Sprite.SetColorMask
package pixel
-// Sprite is a drawable Picture. It's always anchored by the center of it's Picture.
+// Sprite is a drawable Picture. It's anchored by the center of it's Picture.
+//
+// To achieve different anchoring, transformations and color masking, use SetMatrix and SetColorMask
+// methods.
type Sprite struct {
tri *TrianglesData
bounds Rect
d Drawer
+
+ matrix Matrix
+ mask NRGBA
}
// NewSprite creates a Sprite from the supplied Picture.
@@ -14,6 +20,8 @@ func NewSprite(pic Picture) *Sprite {
tri: tri,
d: Drawer{Triangles: tri},
}
+ s.matrix = IM
+ s.mask = NRGBA{1, 1, 1, 1}
s.SetPicture(pic)
return s
}
@@ -28,6 +36,40 @@ func (s *Sprite) SetPicture(pic Picture) {
}
s.bounds = pic.Bounds()
+ s.calcData()
+}
+
+// Picture returns the current Sprite's Picture.
+func (s *Sprite) Picture() Picture {
+ return s.d.Picture
+}
+
+// SetMatrix sets a Matrix that this Sprite will be transformed by. This overrides any previously
+// set Matrix.
+//
+// Note, that this has nothing to do with BasicTarget's SetMatrix method. This only affects this
+// Sprite and is usable with any Target.
+func (s *Sprite) SetMatrix(matrix Matrix) {
+ s.matrix = matrix
+ s.calcData()
+}
+
+// SetColorMask sets a color that this Sprite will be multiplied by. This overrides any previously
+// set color mask.
+//
+// Note, that this has nothing to do with BasicTarget's SetColorMask method. This only affects this
+// Sprite and is usable with any Target.
+func (s *Sprite) SetColorMask(mask NRGBA) {
+ s.mask = mask
+ s.calcData()
+}
+
+// Draw draws the Sprite onto the provided Target.
+func (s *Sprite) Draw(t Target) {
+ s.d.Draw(t)
+}
+
+func (s *Sprite) calcData() {
var (
center = s.bounds.Center()
horizontal = X(s.bounds.W() / 2)
@@ -42,20 +84,12 @@ func (s *Sprite) SetPicture(pic Picture) {
(*s.tri)[5].Position = -horizontal + vertical
for i := range *s.tri {
- (*s.tri)[i].Color = NRGBA{1, 1, 1, 1}
+ (*s.tri)[i].Color = s.mask
(*s.tri)[i].Picture = center + (*s.tri)[i].Position
(*s.tri)[i].Intensity = 1
- }
-
- s.d.Dirty()
-}
-// Picture returns the current Sprite's Picture.
-func (s *Sprite) Picture() Picture {
- return s.d.Picture
+ (*s.tri)[i].Position = s.matrix.Project((*s.tri)[i].Position)
}
-// Draw draws the Sprite onto the provided Target.
-func (s *Sprite) Draw(t Target) {
- s.d.Draw(t)
+ s.d.Dirty()
}
