mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
78 lines
1.9 KiB
Go
78 lines
1.9 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
|
|
)
|
|
|
|
var (
|
|
count int
|
|
brushRenderTarget *ebiten.Image
|
|
canvasRenderTarget *ebiten.Image
|
|
)
|
|
|
|
func Update(screen *ebiten.Image) error {
|
|
if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
|
|
count++
|
|
}
|
|
|
|
mx, my := ebiten.CursorPosition()
|
|
|
|
if ebiten.IsMouseButtonPressed(ebiten.MouseButtonLeft) {
|
|
clr := ebiten.ScaleColor(1.0, 0.25, 0.25, 1.0)
|
|
theta := 2.0 * math.Pi * float64(count%60) / 60.0
|
|
clr.Concat(ebiten.RotateHue(theta))
|
|
canvasRenderTarget.DrawImage(brushRenderTarget, &ebiten.DrawImageOptions{
|
|
GeoM: ebiten.TranslateGeo(float64(mx), float64(my)),
|
|
ColorM: clr,
|
|
})
|
|
}
|
|
|
|
screen.DrawImage(canvasRenderTarget, nil)
|
|
|
|
ebitenutil.DebugPrint(screen, fmt.Sprintf("(%d, %d)", mx, my))
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
var err error
|
|
brushRenderTarget, err = ebiten.NewImage(4, 4, ebiten.FilterNearest)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
brushRenderTarget.Fill(color.White)
|
|
|
|
canvasRenderTarget, err = ebiten.NewImage(screenWidth, screenHeight, ebiten.FilterNearest)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
canvasRenderTarget.Fill(color.White)
|
|
|
|
if err := ebiten.Run(Update, screenWidth, screenHeight, 2, "Paint (Ebiten Demo)"); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|