mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
89 lines
1.9 KiB
Go
89 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 (
|
|
"image/color"
|
|
_ "image/png"
|
|
"log"
|
|
|
|
"github.com/hajimehoshi/ebiten"
|
|
"github.com/hajimehoshi/ebiten/examples/common"
|
|
)
|
|
|
|
const (
|
|
screenWidth = 320
|
|
screenHeight = 240
|
|
)
|
|
|
|
var (
|
|
count int
|
|
ebitenImage *ebiten.Image
|
|
)
|
|
|
|
type imageParts struct {
|
|
diff float64
|
|
}
|
|
|
|
func (p *imageParts) Src(i int) (int, int, int, int) {
|
|
w, h := ebitenImage.Size()
|
|
return 0, 0, w, h
|
|
}
|
|
|
|
func (p *imageParts) Dst(i int) (int, int, int, int) {
|
|
x := int(float64(i%10)*p.diff + 15)
|
|
y := int(float64(i/10)*p.diff + 20)
|
|
w, h := ebitenImage.Size()
|
|
return x, y, x + w, y + h
|
|
}
|
|
|
|
func (p *imageParts) Len() int {
|
|
return 10 * 10
|
|
}
|
|
|
|
func update(screen *ebiten.Image) error {
|
|
count++
|
|
count %= ebiten.FPS * 10
|
|
diff := float64(count) * 0.2
|
|
switch {
|
|
case 480 < count:
|
|
diff = 0
|
|
case 240 < count:
|
|
diff = float64(480-count) * 0.2
|
|
}
|
|
|
|
screen.Fill(color.NRGBA{0x00, 0x00, 0x80, 0xff})
|
|
op := &ebiten.DrawImageOptions{}
|
|
op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
|
|
op.ImageParts = &imageParts{
|
|
diff: diff,
|
|
}
|
|
if err := screen.DrawImage(ebitenImage, op); err != nil {
|
|
return err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
var err error
|
|
ebitenImage, _, err = common.AssetImage("ebiten.png", ebiten.FilterNearest)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Alpha Blending (Ebiten Demo)"); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|