mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-14 06:57:27 +01:00
87 lines
2.3 KiB
Go
87 lines
2.3 KiB
Go
/*
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Copyright 2014 Hajime Hoshi
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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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/color"
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"log"
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"math"
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)
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const (
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screenWidth = 320
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screenHeight = 240
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)
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type Game struct {
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inited bool
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count int
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brushRenderTarget *ebiten.RenderTarget
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canvasRenderTarget *ebiten.RenderTarget
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}
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func (g *Game) Update(gr ebiten.GraphicsContext) error {
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if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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g.count++
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}
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if !g.inited {
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gr.PushRenderTarget(g.brushRenderTarget)
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gr.Fill(0xff, 0xff, 0xff)
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gr.PopRenderTarget()
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gr.PushRenderTarget(g.canvasRenderTarget)
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gr.Fill(0xff, 0xff, 0xff)
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gr.PopRenderTarget()
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g.inited = true
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}
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mx, my := ebiten.CursorPosition()
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if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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gr.PushRenderTarget(g.canvasRenderTarget)
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geo := ebiten.TranslateGeometry(float64(mx), float64(my))
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clr := ebiten.ScaleColor(color.RGBA{0xff, 0x40, 0x40, 0xff})
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theta := 2.0 * math.Pi * float64(g.count%60) / 60.0
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clr.Concat(ebiten.RotateHue(theta))
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ebiten.DrawWholeRenderTarget(gr, g.brushRenderTarget, geo, clr)
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gr.PopRenderTarget()
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}
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ebiten.DrawWholeRenderTarget(gr, g.canvasRenderTarget, ebiten.GeometryMatrixI(), ebiten.ColorMatrixI())
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ebitenutil.DebugPrint(gr, fmt.Sprintf("(%d, %d)", mx, my))
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return nil
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}
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func main() {
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g := new(Game)
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var err error
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g.brushRenderTarget, err = ebiten.NewRenderTarget(1, 1, ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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g.canvasRenderTarget, err = ebiten.NewRenderTarget(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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if err := ebiten.Run(g.Update, screenWidth, screenHeight, 2, "Paint (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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