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Implement paint.go

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This commit is contained in:
Hajime Hoshi 2014-12-14 23:06:21 +09:00
parent e55f53cfab
commit 00a7cb1bac
1 changed files with 22 additions and 2 deletions
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24
example/paint.go
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@ -14,15 +14,26 @@ const (
) )
type Game struct { type Game struct {
brushRenderTarget ebiten.RenderTargetID
canvasRenderTarget ebiten.RenderTargetID canvasRenderTarget ebiten.RenderTargetID
} }
func (g *Game) Update() error { func (g *Game) Update() error {
// TODO: Implement
return nil return nil
} }
func (g *Game) Draw(gr ebiten.GraphicsContext) error { func (g *Game) Draw(gr ebiten.GraphicsContext) error {
if g.brushRenderTarget.IsNil() {
var err error
g.brushRenderTarget, err = ebiten.NewRenderTargetID(1, 1, ebiten.FilterNearest)
if err != nil {
return err
}
gr.PushRenderTarget(g.brushRenderTarget)
gr.Fill(0, 0, 0)
gr.PopRenderTarget()
}
if g.canvasRenderTarget.IsNil() { if g.canvasRenderTarget.IsNil() {
var err error var err error
g.canvasRenderTarget, err = ebiten.NewRenderTargetID(screenWidth, screenHeight, ebiten.FilterNearest) g.canvasRenderTarget, err = ebiten.NewRenderTargetID(screenWidth, screenHeight, ebiten.FilterNearest)
@ -33,9 +44,18 @@ func (g *Game) Draw(gr ebiten.GraphicsContext) error {
gr.Fill(0xff, 0xff, 0xff) gr.Fill(0xff, 0xff, 0xff)
gr.PopRenderTarget() gr.PopRenderTarget()
} }
mx, my := ebiten.CursorPosition()
if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
gr.PushRenderTarget(g.canvasRenderTarget)
geo := ebiten.GeometryMatrixI()
geo.Translate(float64(mx), float64(my))
ebiten.DrawWhole(gr.RenderTarget(g.brushRenderTarget), 1, 1, geo, ebiten.ColorMatrixI())
gr.PopRenderTarget()
}
ebiten.DrawWhole(gr.RenderTarget(g.canvasRenderTarget), screenWidth, screenHeight, ebiten.GeometryMatrixI(), ebiten.ColorMatrixI()) ebiten.DrawWhole(gr.RenderTarget(g.canvasRenderTarget), screenWidth, screenHeight, ebiten.GeometryMatrixI(), ebiten.ColorMatrixI())
mx, my := ebiten.CursorPosition()
ebitenutil.DebugPrint(gr, fmt.Sprintf("(%d, %d)", mx, my)) ebitenutil.DebugPrint(gr, fmt.Sprintf("(%d, %d)", mx, my))
return nil return nil
} }