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