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main.go
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main.go
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// Copyright 2018 The Ebiten Authors
//
// 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"
_ "image/jpeg"
"log"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
)
type Game struct {
highDPIImageCh chan *ebiten.Image
highDPIImage *ebiten.Image
}
func NewGame() *Game {
g := &Game{
highDPIImageCh: make(chan *ebiten.Image),
}
// Licensed under Public Domain
// https://commons.wikimedia.org/wiki/File:As08-16-2593.jpg
const url = "https://upload.wikimedia.org/wikipedia/commons/1/1f/As08-16-2593.jpg"
// Load the image asynchronously.
go func() {
img, err := ebitenutil.NewImageFromURL(url)
if err != nil {
log.Fatal(err)
}
g.highDPIImageCh <- img
close(g.highDPIImageCh)
}()
return g
}
func (g *Game) Update() error {
if g.highDPIImage != nil {
return nil
}
// Use select and 'default' clause for non-blocking receiving.
select {
case img := <-g.highDPIImageCh:
g.highDPIImage = img
default:
}
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
if g.highDPIImage == nil {
ebitenutil.DebugPrint(screen, "Loading the image...")
return
}
sw, sh := screen.Size()
w, h := g.highDPIImage.Size()
op := &ebiten.DrawImageOptions{}
// Move the images's center to the upper left corner.
op.GeoM.Translate(float64(-w)/2, float64(-h)/2)
// The image is just too big. Adjust the scale.
op.GeoM.Scale(0.25, 0.25)
// Scale the image by the device ratio so that the rendering result can be same
// on various (different-DPI) environments.
scale := ebiten.DeviceScaleFactor()
op.GeoM.Scale(scale, scale)
// Move the image's center to the screen's center.
op.GeoM.Translate(float64(sw)/2, float64(sh)/2)
op.Filter = ebiten.FilterLinear
screen.DrawImage(g.highDPIImage, op)
ebitenutil.DebugPrint(screen, fmt.Sprintf("(Init) Device Scale Ratio: %0.2f", scale))
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
// The unit of outsideWidth/Height is device-independent pixels.
// By multiplying them by the device scale factor, we can get a hi-DPI screen size.
s := ebiten.DeviceScaleFactor()
return int(float64(outsideWidth) * s), int(float64(outsideHeight) * s)
}
func main() {
ebiten.SetWindowSize(640, 480)
ebiten.SetWindowTitle("High DPI (Ebitengine Demo)")
if err := ebiten.RunGame(NewGame()); err != nil {
log.Fatal(err)
}
}