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examples/airship: Bug fix: stop if z value equals to or is less than 0

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This commit is contained in:
Hajime Hoshi 2018-03-12 03:23:04 +09:00
parent 6213ee66f7
commit 762fcfc2db
1 changed files with 3 additions and 0 deletions
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3
examples/airship/main.go
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@ -198,6 +198,9 @@ func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) {
// z is in [1, -1] // z is in [1, -1]
rate := float64(j) / float64(ph) rate := float64(j) / float64(ph)
z := (1-rate)*1 + rate*-1 z := (1-rate)*1 + rate*-1
if z <= 0 {
break
}
op := &ebiten.DrawImageOptions{} op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(-float64(pw)/2, 0) op.GeoM.Translate(-float64(pw)/2, 0)
op.GeoM.Scale(1/z, 8) // 8 is an arbitrary number not to make empty lines. op.GeoM.Scale(1/z, 8) // 8 is an arbitrary number not to make empty lines.