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examples/airship: Add fog

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This commit is contained in:
Hajime Hoshi 2016-07-18 05:19:22 +09:00
parent a3396bd415
commit 008b15f61d
1 changed files with 32 additions and 1 deletions
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33
examples/airship/main.go
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@ -16,6 +16,7 @@ package main
import (
"fmt"
"image"
"image/color"
"log"
"math"
@ -41,6 +42,7 @@ var (
}
gophersImage *ebiten.Image
groundImage *ebiten.Image
fogImage *ebiten.Image
)
type player struct {
@ -176,6 +178,14 @@ func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) error {
if err := screen.DrawImage(ground, op); err != nil {
return err
}
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)
if err := screen.DrawImage(fogImage, op); err != nil {
return err
}
return nil
}
@ -220,7 +230,28 @@ func main() {
if err != nil {
log.Fatal(err)
}
groundImage, err = ebiten.NewImage(screenWidth+70, screenHeight*2/3+50, ebiten.FilterNearest)
groundWidth := screenWidth + 70
groundImage, err = ebiten.NewImage(groundWidth, screenHeight*2/3+50, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
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)
println(r, g, b, oa)
clr.R = uint8(r * a / oa)
clr.G = uint8(g * a / oa)
clr.B = uint8(b * a / oa)
clr.A = uint8(a)
fmt.Println(clr)
for i := 0; i < groundWidth; i++ {
fogRGBA.SetRGBA(i, j, clr)
}
}
fogImage, err = ebiten.NewImageFromImage(fogRGBA, ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}