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examples/airship: Refactoring

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This commit is contained in:
Hajime Hoshi 2017-06-04 19:01:07 +09:00
parent 3390393014
commit 5cc7c68698
1 changed files with 45 additions and 42 deletions
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87
examples/airship/main.go
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@ -31,6 +31,7 @@ import (
const (
screenWidth = 320
screenHeight = 240
groundWidth = screenWidth + 70
maxAngle = 256
maxLean = 16
)
@ -48,6 +49,43 @@ var (
fogImage *ebiten.Image
)
func init() {
var err error
gophersImage, _, err = ebitenutil.NewImageFromFile("_resources/images/gophers.jpg", ebiten.FilterNearest)
if err != nil {
panic(err)
}
groundImage, _ = ebiten.NewImage(groundWidth, screenHeight*2/3+50, ebiten.FilterNearest)
const repeat = 5
w, h := gophersImage.Size()
repeatedGophersImage, _ = ebiten.NewImage(w*repeat, h*repeat, ebiten.FilterNearest)
for j := 0; j < repeat; j++ {
for i := 0; i < repeat; i++ {
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(w*i), float64(h*j))
repeatedGophersImage.DrawImage(gophersImage, op)
}
}
}
func init() {
const fogHeight = 8
fogRGBA := image.NewRGBA(image.Rect(0, 0, groundWidth, fogHeight))
for j := 0; j < fogHeight; j++ {
a := uint32(float64(fogHeight-1-j) * 0xff / (fogHeight - 1))
clr := skyColor
r, g, b, oa := uint32(clr.R), uint32(clr.G), uint32(clr.B), uint32(clr.A)
clr.R = uint8(r * a / oa)
clr.G = uint8(g * a / oa)
clr.B = uint8(b * a / oa)
clr.A = uint8(a)
for i := 0; i < groundWidth; i++ {
fogRGBA.SetRGBA(i, j, clr)
}
}
fogImage, _ = ebiten.NewImageFromImage(fogRGBA, ebiten.FilterNearest)
}
type player struct {
x16 int
y16 int
@ -140,10 +178,14 @@ func scaleForLine(h int, x int) float64 {
func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) {
w, h := ground.Size()
g := ebiten.GeoM{}
g.Translate(-float64(w)/2, 0)
g.Rotate(-1 * float64(thePlayer.lean) / maxLean * math.Pi / 8)
g.Translate(float64(w)/2, 0)
g.Translate(float64(screenWidth-w)/2, screenHeight/3)
op := &ebiten.DrawImageOptions{}
for i := 0; i < h; i++ {
op.GeoM.Reset()
// TODO: Refactoring
r := scaleForLine(h, i)
j1 := scaleForLine(h, i)
j2 := scaleForLine(h, i+1)
@ -152,21 +194,14 @@ func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) {
sh := float64(dy1 - dy0)
op.GeoM.Scale(sw, sh)
op.GeoM.Translate(float64(dx0), float64(dy0))
op.GeoM.Translate(-float64(w)/2, 0)
op.GeoM.Rotate(-1 * float64(thePlayer.lean) / maxLean * math.Pi / 8)
op.GeoM.Translate(float64(w)/2, 0)
op.GeoM.Translate(float64(screenWidth-w)/2, screenHeight/3)
op.GeoM.Concat(g)
src := image.Rect(0, i, w, i+1)
op.SourceRect = &src
screen.DrawImage(ground, op)
}
op = &ebiten.DrawImageOptions{}
op.GeoM.Translate(-float64(w)/2, 0)
op.GeoM.Rotate(-1 * float64(thePlayer.lean) / maxLean * math.Pi / 8)
op.GeoM.Translate(float64(w)/2, 0)
op.GeoM.Translate(float64(screenWidth-w)/2, screenHeight/3)
op.GeoM = g
screen.DrawImage(fogImage, op)
}
@ -199,38 +234,6 @@ func update(screen *ebiten.Image) error {
}
func main() {
var err error
gophersImage, _, err = ebitenutil.NewImageFromFile("_resources/images/gophers.jpg", ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
w, h := gophersImage.Size()
const repeat = 5
repeatedGophersImage, _ = ebiten.NewImage(w*repeat, h*repeat, ebiten.FilterNearest)
for j := 0; j < repeat; j++ {
for i := 0; i < repeat; i++ {
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(w*i), float64(h*j))
repeatedGophersImage.DrawImage(gophersImage, op)
}
}
groundWidth := screenWidth + 70
groundImage, _ = ebiten.NewImage(groundWidth, screenHeight*2/3+50, ebiten.FilterNearest)
const fogHeight = 8
fogRGBA := image.NewRGBA(image.Rect(0, 0, groundWidth, fogHeight))
for j := 0; j < fogHeight; j++ {
a := uint32(float64(fogHeight-1-j) * 0xff / (fogHeight - 1))
clr := skyColor
r, g, b, oa := uint32(clr.R), uint32(clr.G), uint32(clr.B), uint32(clr.A)
clr.R = uint8(r * a / oa)
clr.G = uint8(g * a / oa)
clr.B = uint8(b * a / oa)
clr.A = uint8(a)
for i := 0; i < groundWidth; i++ {
fogRGBA.SetRGBA(i, j, clr)
}
}
fogImage, _ = ebiten.NewImageFromImage(fogRGBA, ebiten.FilterNearest)
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Air Ship (Ebiten Demo)"); err != nil {
log.Fatal(err)
}