mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-25 19:28:57 +01:00
77 lines
1.9 KiB
Go
77 lines
1.9 KiB
Go
// Copyright 2014 Hajime Hoshi
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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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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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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)
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func Update(screen *ebiten.Image) error {
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if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
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count++
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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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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(mx), float64(my))
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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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canvasRenderTarget.DrawImage(brushRenderTarget, op)
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}
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screen.DrawImage(canvasRenderTarget, nil)
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ebitenutil.DebugPrint(screen, 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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var err error
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brushRenderTarget, err = ebiten.NewImage(4, 4, 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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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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if err := ebiten.Run(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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