2014-12-24 03:04:10 +01:00
|
|
|
// 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.
|
2014-12-20 08:15:21 +01:00
|
|
|
|
2018-03-14 17:26:21 +01:00
|
|
|
// +build example jsgo
|
2016-08-25 17:40:39 +02:00
|
|
|
|
2014-12-20 08:15:21 +01:00
|
|
|
package main
|
|
|
|
|
|
|
|
import (
|
2018-03-14 17:16:41 +01:00
|
|
|
"bytes"
|
|
|
|
"image"
|
2014-12-20 08:15:21 +01:00
|
|
|
"image/color"
|
|
|
|
_ "image/png"
|
|
|
|
"log"
|
2016-02-15 17:13:04 +01:00
|
|
|
|
|
|
|
"github.com/hajimehoshi/ebiten"
|
2018-03-14 17:16:41 +01:00
|
|
|
"github.com/hajimehoshi/ebiten/examples/resources/images"
|
2014-12-20 08:15:21 +01:00
|
|
|
)
|
|
|
|
|
|
|
|
const (
|
|
|
|
screenWidth = 320
|
|
|
|
screenHeight = 240
|
|
|
|
)
|
|
|
|
|
2014-12-22 17:26:44 +01:00
|
|
|
var (
|
2016-04-22 18:34:02 +02:00
|
|
|
count int
|
|
|
|
ebitenImage *ebiten.Image
|
2014-12-22 17:26:44 +01:00
|
|
|
)
|
2014-12-20 08:15:21 +01:00
|
|
|
|
2014-12-23 16:08:22 +01:00
|
|
|
func update(screen *ebiten.Image) error {
|
2014-12-22 17:26:44 +01:00
|
|
|
count++
|
2016-03-12 20:48:13 +01:00
|
|
|
count %= ebiten.FPS * 10
|
2014-12-22 17:26:44 +01:00
|
|
|
diff := float64(count) * 0.2
|
2014-12-20 11:11:06 +01:00
|
|
|
switch {
|
2014-12-22 17:26:44 +01:00
|
|
|
case 480 < count:
|
2014-12-20 11:11:06 +01:00
|
|
|
diff = 0
|
2014-12-22 17:26:44 +01:00
|
|
|
case 240 < count:
|
|
|
|
diff = float64(480-count) * 0.2
|
2014-12-20 08:15:21 +01:00
|
|
|
}
|
2018-01-22 15:07:55 +01:00
|
|
|
|
2017-05-16 03:35:58 +02:00
|
|
|
if ebiten.IsRunningSlowly() {
|
|
|
|
return nil
|
|
|
|
}
|
2018-01-22 15:07:55 +01:00
|
|
|
|
2017-03-04 15:00:19 +01:00
|
|
|
screen.Fill(color.NRGBA{0x00, 0x00, 0x80, 0xff})
|
2018-01-22 15:07:55 +01:00
|
|
|
|
|
|
|
// Draw 100 Ebitens
|
2016-04-22 18:34:02 +02:00
|
|
|
op := &ebiten.DrawImageOptions{}
|
|
|
|
op.ColorM.Scale(1.0, 1.0, 1.0, 0.5)
|
2017-05-27 19:24:23 +02:00
|
|
|
for i := 0; i < 10*10; i++ {
|
|
|
|
op.GeoM.Reset()
|
|
|
|
x := float64(i%10)*diff + 15
|
|
|
|
y := float64(i/10)*diff + 20
|
|
|
|
op.GeoM.Translate(x, y)
|
|
|
|
screen.DrawImage(ebitenImage, op)
|
2016-04-22 18:34:02 +02:00
|
|
|
}
|
2014-12-20 08:15:21 +01:00
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
|
|
|
func main() {
|
2018-03-16 04:05:53 +01:00
|
|
|
// Decode image from a byte slice instead of a file so that
|
|
|
|
// this example works in any working directory.
|
|
|
|
// If you want to use a file, there are some options:
|
|
|
|
// 1) Use os.Open and pass the file to the image decoder.
|
|
|
|
// This is a very regular way, but doesn't work on browsers.
|
|
|
|
// 2) Use ebitenutil.OpenFile and pass the file to the image decoder.
|
|
|
|
// This works even on browsers.
|
|
|
|
// 3) Use ebitenutil.NewImageFromFile to create an ebiten.Image directly from a file.
|
|
|
|
// This also works on browsers.
|
2018-03-14 17:16:41 +01:00
|
|
|
img, _, err := image.Decode(bytes.NewReader(images.Ebiten_png))
|
2014-12-20 08:15:21 +01:00
|
|
|
if err != nil {
|
|
|
|
log.Fatal(err)
|
|
|
|
}
|
2018-03-14 17:16:41 +01:00
|
|
|
ebitenImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
|
|
|
|
|
2014-12-23 16:08:22 +01:00
|
|
|
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Alpha Blending (Ebiten Demo)"); err != nil {
|
2014-12-20 08:15:21 +01:00
|
|
|
log.Fatal(err)
|
|
|
|
}
|
|
|
|
}
|