ebiten/examples/fullscreen/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.
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//go:build example
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// +build example
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package main
import (
"bytes"
"errors"
"fmt"
"image"
"image/color"
_ "image/jpeg"
"log"
"math"
"golang.org/x/image/font"
"golang.org/x/image/font/opentype"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/examples/resources/fonts"
"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
"github.com/hajimehoshi/ebiten/v2/text"
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)
var (
gophersImage *ebiten.Image
mplusFont font.Face
regularTermination = errors.New("regular termination")
)
func init() {
// 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)
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}
func initFont() {
tt, err := opentype.Parse(fonts.MPlus1pRegular_ttf)
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if err != nil {
log.Fatal(err)
}
const dpi = 72
mplusFont, err = opentype.NewFace(tt, &opentype.FaceOptions{
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Size: 12 * ebiten.DeviceScaleFactor(),
DPI: dpi,
Hinting: font.HintingFull,
})
if err != nil {
log.Fatal(err)
}
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}
type Game struct {
count int
}
func (g *Game) Update() error {
g.count++
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if ebiten.IsKeyPressed(ebiten.KeyQ) {
return regularTermination
}
return nil
}
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func (g *Game) Draw(screen *ebiten.Image) {
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scale := ebiten.DeviceScaleFactor()
w, h := gophersImage.Size()
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
op.GeoM.Scale(scale, scale)
op.GeoM.Rotate(float64(g.count%360) * 2 * math.Pi / 360)
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sw, sh := screen.Size()
op.GeoM.Translate(float64(sw)/2, float64(sh)/2)
op.Filter = ebiten.FilterLinear
screen.DrawImage(gophersImage, op)
fw, fh := ebiten.ScreenSizeInFullscreen()
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msgs := []string{
"This is an example of the finest fullscreen. Press Q to quit.",
fmt.Sprintf("Screen size in fullscreen: %d, %d", fw, fh),
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fmt.Sprintf("Game's screen size: %d, %d", sw, sh),
fmt.Sprintf("Device scale factor: %0.2f", scale),
}
for i, msg := range msgs {
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text.Draw(screen, msg, mplusFont, int(50*scale), int(50+float64(i)*16*scale), color.White)
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}
}
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func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
s := ebiten.DeviceScaleFactor()
return int(float64(outsideWidth) * s), int(float64(outsideHeight) * s)
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}
func main() {
// Call initFont here instead of init funcs since ebiten.DeviceScaleFactor is not available in init.
initFont()
ebiten.SetFullscreen(true)
ebiten.SetWindowTitle("Fullscreen (Ebiten Demo)")
if err := ebiten.RunGame(&Game{}); err != nil && err != regularTermination {
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log.Fatal(err)
}
}