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examples/spritse: Speed optimization

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This commit is contained in:
Hajime Hoshi 2016-10-28 00:39:55 +09:00
parent 2c4dc3681a
commit 26e290b2bc
1 changed files with 17 additions and 18 deletions
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19
examples/sprites/main.go
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@ -38,7 +38,8 @@ var (
) )
type Sprite struct { type Sprite struct {
image *ebiten.Image imageWidth int
imageHeight int
x int x int
y int y int
vx int vx int
@ -51,18 +52,15 @@ func (s *Sprite) Update() {
if s.x < 0 { if s.x < 0 {
s.x = -s.x s.x = -s.x
s.vx = -s.vx s.vx = -s.vx
} else if screenWidth <= s.x+s.imageWidth {
s.x = 2*(screenWidth-s.imageWidth) - s.x
s.vx = -s.vx
} }
if s.y < 0 { if s.y < 0 {
s.y = -s.y s.y = -s.y
s.vy = -s.vy s.vy = -s.vy
} } else if screenHeight <= s.y+s.imageHeight {
w, h := s.image.Size() s.y = 2*(screenHeight-s.imageHeight) - s.y
if screenWidth <= s.x+w {
s.x = 2*(screenWidth-w) - s.x
s.vx = -s.vx
}
if screenHeight <= s.y+h {
s.y = 2*(screenHeight-h) - s.y
s.vy = -s.vy s.vy = -s.vy
} }
} }
@ -150,7 +148,8 @@ func main() {
x, y := rand.Intn(screenWidth-w), rand.Intn(screenHeight-h) x, y := rand.Intn(screenWidth-w), rand.Intn(screenHeight-h)
vx, vy := 2*rand.Intn(2)-1, 2*rand.Intn(2)-1 vx, vy := 2*rand.Intn(2)-1, 2*rand.Intn(2)-1
sprites.sprites[i] = &Sprite{ sprites.sprites[i] = &Sprite{
image: ebitenImage, imageWidth: w,
imageHeight: h,
x: x, x: x,
y: y, y: y,
vx: vx, vx: vx,