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examples/sprite: Refactoring

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This commit is contained in:
Hajime Hoshi 2018-06-17 18:44:32 +09:00
parent 1849b59741
commit 9f34b79297
1 changed files with 7 additions and 5 deletions
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12
examples/sprites/main.go
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@ -56,19 +56,21 @@ 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 { } else if mx := screenWidth - s.imageWidth; mx <= s.x {
s.x = 2*(screenWidth-s.imageWidth) - s.x s.x = 2*mx - s.x
s.vx = -s.vx 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 { } else if my := screenHeight - s.imageHeight; my <= s.y {
s.y = 2*(screenHeight-s.imageHeight) - s.y s.y = 2*my - s.y
s.vy = -s.vy s.vy = -s.vy
} }
s.angle++ s.angle++
s.angle %= maxAngle if s.angle == maxAngle {
s.angle = 0
}
} }
type Sprites struct { type Sprites struct {