mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 04:57:26 +01:00
93 lines
2.6 KiB
Go
93 lines
2.6 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.
|
|
|
|
// +build example jsgo
|
|
|
|
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"image"
|
|
_ "image/jpeg"
|
|
"log"
|
|
|
|
"github.com/hajimehoshi/ebiten/v2"
|
|
"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
|
|
)
|
|
|
|
const (
|
|
screenWidth = 320
|
|
screenHeight = 240
|
|
)
|
|
|
|
var (
|
|
gophersImage *ebiten.Image
|
|
)
|
|
|
|
type Game struct{}
|
|
|
|
func (g *Game) Update() error {
|
|
return nil
|
|
}
|
|
|
|
func (g *Game) Draw(screen *ebiten.Image) {
|
|
// Split the image into horizontal lines and draw them with different scales.
|
|
op := &ebiten.DrawImageOptions{}
|
|
w, h := gophersImage.Size()
|
|
for i := 0; i < h; i++ {
|
|
op.GeoM.Reset()
|
|
|
|
// Move the image's center to the upper-left corner.
|
|
op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
|
|
|
|
// Scale each lines and adjust the position.
|
|
lineW := w + i*3/4
|
|
x := -float64(lineW) / float64(w) / 2
|
|
op.GeoM.Scale(float64(lineW)/float64(w), 1)
|
|
op.GeoM.Translate(x, float64(i))
|
|
|
|
// Move the image's center to the screen's center.
|
|
op.GeoM.Translate(screenWidth/2, screenHeight/2)
|
|
|
|
screen.DrawImage(gophersImage.SubImage(image.Rect(0, i, w, i+1)).(*ebiten.Image), op)
|
|
}
|
|
}
|
|
|
|
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
|
|
return screenWidth, screenHeight
|
|
}
|
|
|
|
func main() {
|
|
// 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.
|
|
img, _, err := image.Decode(bytes.NewReader(images.Gophers_jpg))
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
gophersImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
|
|
|
|
ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
|
|
ebiten.SetWindowTitle("Perspective (Ebiten Demo)")
|
|
if err := ebiten.RunGame(&Game{}); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|