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examples/infinitescroll: Refactoring

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This commit is contained in:
Hajime Hoshi 2018-01-29 00:05:12 +09:00
parent 2f0909e705
commit 0fd8afd495
1 changed files with 29 additions and 53 deletions
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82
examples/infinitescroll/main.go
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@ -20,7 +20,6 @@ import (
"fmt" "fmt"
_ "image/png" _ "image/png"
"log" "log"
"math"
"github.com/hajimehoshi/ebiten" "github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil" "github.com/hajimehoshi/ebiten/ebitenutil"
@ -32,10 +31,19 @@ const (
) )
var ( var (
theViewport = &viewport{} bgImage *ebiten.Image
bgImage *ebiten.Image )
repeatedBgImage *ebiten.Image
groundImage *ebiten.Image func init() {
var err error
bgImage, _, err = ebitenutil.NewImageFromFile(ebitenutil.JoinStringsIntoFilePath("_resources", "images", "tile.png"), ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
}
var (
theViewport = &viewport{}
) )
type viewport struct { type viewport struct {
@ -43,80 +51,48 @@ type viewport struct {
y16 int y16 int
} }
func round(x float64) float64 {
return math.Floor(x + 0.5)
}
func (p *viewport) Move() { func (p *viewport) Move() {
w, h := bgImage.Size() w, h := bgImage.Size()
mx := w * 16 maxX16 := w * 16
my := h * 16 maxY16 := h * 16
p.x16 += w / 32 p.x16 += w / 32
p.y16 += h / 32 p.y16 += h / 32
p.x16 %= maxX16
for mx <= p.x16 { p.y16 %= maxY16
p.x16 -= mx
}
for my <= p.y16 {
p.y16 -= my
}
for p.x16 < 0 {
p.x16 += mx
}
for p.y16 < 0 {
p.y16 += my
}
} }
func (p *viewport) Position() (int, int) { func (p *viewport) Position() (int, int) {
return p.x16, p.y16 return p.x16, p.y16
} }
func updateGroundImage(ground *ebiten.Image) {
ground.Clear()
x16, y16 := theViewport.Position()
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(-x16)/16, float64(-y16)/16)
ground.DrawImage(repeatedBgImage, op)
}
func drawGroundImage(screen *ebiten.Image, ground *ebiten.Image) {
op := &ebiten.DrawImageOptions{}
screen.DrawImage(ground, op)
}
func update(screen *ebiten.Image) error { func update(screen *ebiten.Image) error {
theViewport.Move() theViewport.Move()
if ebiten.IsRunningSlowly() { if ebiten.IsRunningSlowly() {
return nil return nil
} }
updateGroundImage(groundImage)
drawGroundImage(screen, groundImage)
msg := fmt.Sprintf("FPS: %0.2f", ebiten.CurrentFPS()) x16, y16 := theViewport.Position()
ebitenutil.DebugPrint(screen, msg) offsetX, offsetY := float64(-x16)/16, float64(-y16)/16
return nil
}
func main() { // Draw bgImage on the screen repeatedly.
var err error const repeat = 3
bgImage, _, err = ebitenutil.NewImageFromFile(ebitenutil.JoinStringsIntoFilePath("_resources", "images", "tile.png"), ebiten.FilterNearest)
if err != nil {
log.Fatal(err)
}
w, h := bgImage.Size() w, h := bgImage.Size()
const repeat = 5
repeatedBgImage, _ = ebiten.NewImage(w*repeat, h*repeat, ebiten.FilterNearest)
for j := 0; j < repeat; j++ { for j := 0; j < repeat; j++ {
for i := 0; i < repeat; i++ { for i := 0; i < repeat; i++ {
op := &ebiten.DrawImageOptions{} op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(w*i), float64(h*j)) op.GeoM.Translate(float64(w*i), float64(h*j))
repeatedBgImage.DrawImage(bgImage, op) op.GeoM.Translate(offsetX, offsetY)
screen.DrawImage(bgImage, op)
} }
} }
groundImage, _ = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
ebitenutil.DebugPrint(screen, fmt.Sprintf("FPS: %0.2f", ebiten.CurrentFPS()))
return nil
}
func main() {
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Infinite Scroll (Ebiten Demo)"); err != nil { if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Infinite Scroll (Ebiten Demo)"); err != nil {
log.Fatal(err) log.Fatal(err)
} }