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examples/airship: better approximate scaling

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This commit is contained in:
Hajime Hoshi 2017-06-07 00:41:23 +09:00
parent b526aed817
commit 2ec4e31d60
1 changed files with 2 additions and 2 deletions
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4
examples/airship/main.go
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@ -173,7 +173,7 @@ func updateGroundImage(ground *ebiten.Image) {
func scaleForLine(x int) float64 {
// This is an very rough approximate calculation.
return math.Pow(float64(x), 1.2)
return math.Pow(float64(x)/2.5, 1.2)
}
func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) {
@ -188,7 +188,7 @@ func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) {
op.GeoM.Reset()
x := scaleForLine(i)
j := scaleForLine(i)
dx0, dy0, dx1, dy1 := -x, j, float64(w)+x, j+4
dx0, dy0, dx1, dy1 := -x, j, float64(w)+x, j+6
sw := float64(dx1-dx0) / float64(w)
sh := float64(dy1 - dy0)
op.GeoM.Scale(sw, sh)