mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
69 lines
1.7 KiB
Go
69 lines
1.7 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
|
|
|
|
package main
|
|
|
|
import (
|
|
"image"
|
|
_ "image/jpeg"
|
|
"log"
|
|
|
|
"github.com/hajimehoshi/ebiten"
|
|
"github.com/hajimehoshi/ebiten/ebitenutil"
|
|
)
|
|
|
|
const (
|
|
screenWidth = 320
|
|
screenHeight = 240
|
|
)
|
|
|
|
var (
|
|
gophersImage *ebiten.Image
|
|
)
|
|
|
|
func update(screen *ebiten.Image) error {
|
|
if ebiten.IsRunningSlowly() {
|
|
return nil
|
|
}
|
|
op := &ebiten.DrawImageOptions{}
|
|
w, h := gophersImage.Size()
|
|
for i := 0; i < h; i++ {
|
|
op.GeoM.Reset()
|
|
width := w + i*3/4
|
|
x := ((h - i) * 3 / 4) / 2
|
|
op.GeoM.Scale(float64(width)/float64(w), 1)
|
|
op.GeoM.Translate(float64(x), float64(i))
|
|
maxWidth := float64(w) + float64(h)*3/4
|
|
op.GeoM.Translate(-maxWidth/2, -float64(h)/2)
|
|
op.GeoM.Translate(screenWidth/2, screenHeight/2)
|
|
r := image.Rect(0, i, w, i+1)
|
|
op.SourceRect = &r
|
|
screen.DrawImage(gophersImage, op)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func main() {
|
|
var err error
|
|
gophersImage, _, err = ebitenutil.NewImageFromFile(ebitenutil.JoinStringsIntoFilePath("_resources", "images", "gophers.jpg"), ebiten.FilterNearest)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
if err := ebiten.Run(update, screenWidth, screenHeight, 2, "Perspective (Ebiten Demo)"); err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
}
|