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Improve example/paint

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This commit is contained in:
Hajime Hoshi 2015-01-09 02:33:26 +09:00
parent 1dd1403aac
commit fb19f05b83
1 changed files with 20 additions and 9 deletions
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29
example/paint/main.go
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@ -18,6 +18,7 @@ import (
"fmt" "fmt"
"github.com/hajimehoshi/ebiten" "github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil" "github.com/hajimehoshi/ebiten/ebitenutil"
"image"
"image/color" "image/color"
"log" "log"
"math" "math"
@ -29,9 +30,9 @@ const (
) )
var ( var (
count int count int
brushRenderTarget *ebiten.Image brushImage *ebiten.Image
canvasRenderTarget *ebiten.Image canvasImage *ebiten.Image
) )
func update(screen *ebiten.Image) error { func update(screen *ebiten.Image) error {
@ -47,12 +48,12 @@ func update(screen *ebiten.Image) error {
op.ColorM.Scale(1.0, 0.25, 0.25, 1.0) op.ColorM.Scale(1.0, 0.25, 0.25, 1.0)
theta := 2.0 * math.Pi * float64(count%60) / 60.0 theta := 2.0 * math.Pi * float64(count%60) / 60.0
op.ColorM.Concat(ebiten.RotateHue(theta)) op.ColorM.Concat(ebiten.RotateHue(theta))
if err := canvasRenderTarget.DrawImage(brushRenderTarget, op); err != nil { if err := canvasImage.DrawImage(brushImage, op); err != nil {
return err return err
} }
} }
if err := screen.DrawImage(canvasRenderTarget, nil); err != nil { if err := screen.DrawImage(canvasImage, nil); err != nil {
return err return err
} }
@ -64,17 +65,27 @@ func update(screen *ebiten.Image) error {
func main() { func main() {
var err error var err error
brushRenderTarget, err = ebiten.NewImage(4, 4, ebiten.FilterNearest) const a0, a1, a2 = 0x40, 0xc0, 0xff
pixels := []uint8{
a0, a1, a1, a0,
a1, a2, a2, a1,
a1, a2, a2, a1,
a0, a1, a1, a0,
}
brushImage, err = ebiten.NewImageFromImage(&image.Alpha{
Pix: pixels,
Stride: 4,
Rect: image.Rect(0, 0, 4, 4),
}, ebiten.FilterNearest)
if err != nil { if err != nil {
log.Fatal(err) log.Fatal(err)
} }
brushRenderTarget.Fill(color.White)
canvasRenderTarget, err = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest) canvasImage, err = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
if err != nil { if err != nil {
log.Fatal(err) log.Fatal(err)
} }
canvasRenderTarget.Fill(color.White) canvasImage.Fill(color.White)
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Paint (Ebiten Demo)"); err != nil { if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Paint (Ebiten Demo)"); err != nil {
log.Fatal(err) log.Fatal(err)