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examples/airship: Better scaling

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This commit is contained in:
Hajime Hoshi 2016-07-18 00:52:54 +09:00
parent 39fd17cdac
commit a3396bd415
1 changed files with 18 additions and 11 deletions
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29
examples/airship/main.go
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@ -59,8 +59,8 @@ func (p *player) MoveForward() {
mx := w * 16
my := h * 16
s, c := math.Sincos(float64(p.angle) * 2 * math.Pi / maxAngle)
p.x16 += int(round(16 * c))
p.y16 += int(round(16 * s))
p.x16 += int(round(16*c) * 2)
p.y16 += int(round(16*s) * 2)
for mx <= p.x16 {
p.x16 -= mx
}
@ -115,17 +115,20 @@ func (p *player) Angle() int {
}
func updateGroundImage(ground *ebiten.Image) error {
if err := ground.Clear(); err != nil {
return err
}
x16, y16 := thePlayer.Position()
a := thePlayer.Angle()
gw, gh := ground.Size()
w, h := gophersImage.Size()
for j := -1; j <= 1; j++ {
for i := -1; i <= 1; i++ {
for j := -2; j <= 2; j++ {
for i := -2; i <= 2; i++ {
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(-x16)/16, float64(-y16)/16)
op.GeoM.Translate(float64(w*i), float64(h*j))
op.GeoM.Rotate(float64(-a)*2*math.Pi/maxAngle + math.Pi*3.0/2.0)
op.GeoM.Translate(float64(gw)/2, float64(gh))
op.GeoM.Translate(float64(gw)/2, float64(gh)-32)
if err := ground.DrawImage(gophersImage, op); err != nil {
return err
}
@ -148,14 +151,18 @@ func (g *groundParts) Src(i int) (int, int, int, int) {
return 0, i, w, i + 1
}
func (g *groundParts) scaleForLine(x float64) float64 {
_, h := g.image.Size()
x = float64(h) - x
return 200*((-x+50)/(x+50)+1) - 200*((-float64(h)+50)/(float64(h)+50)+1)
}
func (g *groundParts) Dst(i int) (int, int, int, int) {
w, _ := g.image.Size()
r := i * 2
j := 1.0
for idx := 0; idx < i; idx++ {
j += float64(idx) / 40
}
return -r, int(j), w + r, int(float64(j)+float64(i)/40) + 1
r := g.scaleForLine(float64(i))
j1 := g.scaleForLine(float64(i))
j2 := g.scaleForLine(float64(i + 1))
return -int(r), int(j1), w + int(r), int(math.Ceil(j2))
}
func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) error {