mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
81 lines
2.1 KiB
Go
81 lines
2.1 KiB
Go
/*
|
|
Copyright 2014 Hajime Hoshi
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"github.com/hajimehoshi/ebiten"
|
|
"github.com/hajimehoshi/ebiten/ebitenutil"
|
|
"image/color"
|
|
"log"
|
|
"math"
|
|
)
|
|
|
|
const (
|
|
screenWidth = 320
|
|
screenHeight = 240
|
|
)
|
|
|
|
type Game struct {
|
|
inited bool
|
|
count int
|
|
brushRenderTarget *ebiten.RenderTarget
|
|
canvasRenderTarget *ebiten.RenderTarget
|
|
}
|
|
|
|
func (g *Game) Update(r *ebiten.RenderTarget) error {
|
|
if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
|
|
g.count++
|
|
}
|
|
if !g.inited {
|
|
g.brushRenderTarget.Fill(color.White)
|
|
g.canvasRenderTarget.Fill(color.White)
|
|
g.inited = true
|
|
}
|
|
|
|
mx, my := ebiten.CursorPosition()
|
|
|
|
if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
|
|
geo := ebiten.TranslateGeometry(float64(mx), float64(my))
|
|
clr := ebiten.ScaleColor(color.RGBA{0xff, 0x40, 0x40, 0xff})
|
|
theta := 2.0 * math.Pi * float64(g.count%60) / 60.0
|
|
clr.Concat(ebiten.RotateHue(theta))
|
|
ebiten.DrawWholeTexture(g.canvasRenderTarget, g.brushRenderTarget.Texture(), geo, clr)
|
|
}
|
|
|
|
ebiten.DrawWholeTexture(r, g.canvasRenderTarget.Texture(), ebiten.GeometryMatrixI(), ebiten.ColorMatrixI())
|
|
|
|
ebitenutil.DebugPrint(r, fmt.Sprintf("(%d, %d)", mx, my))
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
g := new(Game)
|
|
var err error
|
|
g.brushRenderTarget, err = ebiten.NewRenderTarget(1, 1, ebiten.FilterNearest)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
g.canvasRenderTarget, err = ebiten.NewRenderTarget(screenWidth, screenHeight, ebiten.FilterNearest)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
if err := ebiten.Run(g.Update, screenWidth, screenHeight, 2, "Paint (Ebiten Demo)"); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|