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examples: Use RunGame

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Updates #1111
This commit is contained in:
Hajime Hoshi
2020-05-12 02:11:09 +09:00
parent a5d570a7a8
commit dc3ed76e3e
5 changed files with 130 additions and 83 deletions
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74
examples/masking/main.go
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@@ -38,10 +38,6 @@ var (
fgImage *ebiten.Image
maskedFgImage *ebiten.Image
spotLightImage *ebiten.Image
spotLightX = 0
spotLightY = 0
spotLightVX = 1
spotLightVY = 1
)
func init() {
@@ -84,37 +80,59 @@ func init() {
spotLightImage, _ = ebiten.NewImageFromImage(a, ebiten.FilterDefault)
}
func update(screen *ebiten.Image) error {
spotLightX += spotLightVX
spotLightY += spotLightVY
if spotLightX < 0 {
spotLightX = -spotLightX
spotLightVX = -spotLightVX
type Game struct {
spotLightX int
spotLightY int
spotLightVX int
spotLightVY int
}
func NewGame() *Game {
return &Game{
spotLightX: 0,
spotLightY: 0,
spotLightVX: 1,
spotLightVY: 1,
}
if spotLightY < 0 {
spotLightY = -spotLightY
spotLightVY = -spotLightVY
}
func (g *Game) Update(screen *ebiten.Image) error {
if g.spotLightVX == 0 {
g.spotLightVX = 1
}
if g.spotLightVY == 0 {
g.spotLightVY = 1
}
g.spotLightX += g.spotLightVX
g.spotLightY += g.spotLightVY
if g.spotLightX < 0 {
g.spotLightX = -g.spotLightX
g.spotLightVX = -g.spotLightVX
}
if g.spotLightY < 0 {
g.spotLightY = -g.spotLightY
g.spotLightVY = -g.spotLightVY
}
w, h := spotLightImage.Size()
maxX, maxY := screenWidth-w, screenHeight-h
if maxX < spotLightX {
spotLightX = -spotLightX + 2*maxX
spotLightVX = -spotLightVX
if maxX < g.spotLightX {
g.spotLightX = -g.spotLightX + 2*maxX
g.spotLightVX = -g.spotLightVX
}
if maxY < spotLightY {
spotLightY = -spotLightY + 2*maxY
spotLightVY = -spotLightVY
}
if ebiten.IsDrawingSkipped() {
return nil
if maxY < g.spotLightY {
g.spotLightY = -g.spotLightY + 2*maxY
g.spotLightVY = -g.spotLightVY
}
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
// Reset the maskedFgImage.
maskedFgImage.Fill(color.White)
op := &ebiten.DrawImageOptions{}
op.CompositeMode = ebiten.CompositeModeCopy
op.GeoM.Translate(float64(spotLightX), float64(spotLightY))
op.GeoM.Translate(float64(g.spotLightX), float64(g.spotLightY))
maskedFgImage.DrawImage(spotLightImage, op)
// Use 'source-in' composite mode so that the source image (fgImage) is used but the alpha
@@ -133,8 +151,10 @@ func update(screen *ebiten.Image) error {
screen.Fill(color.RGBA{0x00, 0x00, 0x80, 0xff})
screen.DrawImage(bgImage, &ebiten.DrawImageOptions{})
screen.DrawImage(maskedFgImage, &ebiten.DrawImageOptions{})
}
return nil
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
}
func max(a, b int) int {
@@ -152,7 +172,9 @@ func min(a, b int) int {
}
func main() {
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Masking (Ebiten Demo)"); err != nil {
ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
ebiten.SetWindowTitle("Masking (Ebiten Demo)")
if err := ebiten.RunGame(&Game{}); err != nil {
log.Fatal(err)
}
}