From 055da8dfbb73e793e1baa141cf0c00bbd6729877 Mon Sep 17 00:00:00 2001
From: faiface <faiface@ksp.sk>
Date: Tue, 7 Mar 2017 22:47:55 +0100
Subject: [PATCH] add Sprite
---
graphics.go | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
create mode 100644 graphics.go
diff --git a/graphics.go b/graphics.go
new file mode 100644
index 0000000..70f3dd4
--- /dev/null
+++ b/graphics.go
@@ -0,0 +1,53 @@
+package pixel
+
+// Sprite is a drawable Picture. It's always anchored by the center of it's Picture.
+type Sprite struct {
+ tri *TrianglesData
+ d Drawer
+}
+
+// NewSprite creates a Sprite from the supplied Picture.
+func NewSprite(pic Picture) *Sprite {
+ tri := MakeTrianglesData(6)
+ s := &Sprite{
+ tri: tri,
+ d: Drawer{Triangles: tri},
+ }
+ s.SetPicture(pic)
+ return s
+}
+
+// SetPicture changes the Sprite's Picture. The new Picture may have a different size, everything
+// works.
+func (s *Sprite) SetPicture(pic Picture) {
+ var (
+ bounds = pic.Bounds()
+ center = bounds.Center()
+ horizontal = V(bounds.W()/2, 0)
+ vertical = V(0, bounds.H()/2)
+ )
+ (*s.tri)[0].Position = -horizontal - vertical
+ (*s.tri)[1].Position = +horizontal - vertical
+ (*s.tri)[2].Position = +horizontal + vertical
+ (*s.tri)[3].Position = -horizontal - vertical
+ (*s.tri)[4].Position = +horizontal + vertical
+ (*s.tri)[5].Position = -horizontal + vertical
+ for i := range *s.tri {
+ (*s.tri)[i].Color = NRGBA{1, 1, 1, 1}
+ (*s.tri)[i].Picture = center + (*s.tri)[i].Position
+ (*s.tri)[i].Intensity = 1
+ }
+
+ s.d.Dirty()
+ s.d.Picture = pic
+}
+
+// Picture returns the current Sprite's Picture.
+func (s *Sprite) Picture() Picture {
+ return s.d.Picture
+}
+
+// Draw draws the Sprite onto the provided Target.
+func (s *Sprite) Draw(t Target) {
+ s.d.Draw(t)
+}
--
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