ebiten/examples/windowsize/main.go

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// Copyright 2015 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
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package main
import (
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"fmt"
"image/color"
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_ "image/jpeg"
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"log"
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"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
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)
const (
initScreenWidth = 320
initScreenHeight = 240
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initScreenScale = 2
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)
var (
gophersImage *ebiten.Image
keyStates = map[ebiten.Key]int{
ebiten.KeyUp: 0,
ebiten.KeyDown: 0,
ebiten.KeyLeft: 0,
ebiten.KeyRight: 0,
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ebiten.KeyS: 0,
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}
)
func update(screen *ebiten.Image) error {
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for key := range keyStates {
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if !ebiten.IsKeyPressed(key) {
keyStates[key] = 0
continue
}
keyStates[key]++
}
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screenScale := ebiten.ScreenScale()
d := int(32 / screenScale)
screenWidth, screenHeight := screen.Size()
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if keyStates[ebiten.KeyUp] == 1 {
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screenHeight += d
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}
if keyStates[ebiten.KeyDown] == 1 {
if 16 < screenHeight && d < screenHeight {
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screenHeight -= d
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}
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}
if keyStates[ebiten.KeyLeft] == 1 {
if 16 < screenWidth && d < screenWidth {
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screenWidth -= d
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}
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}
if keyStates[ebiten.KeyRight] == 1 {
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screenWidth += d
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}
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if keyStates[ebiten.KeyS] == 1 {
switch screenScale {
case 1:
screenScale = 1.5
case 1.5:
screenScale = 2
case 2:
screenScale = 1
default:
panic("not reach")
}
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}
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ebiten.SetScreenSize(screenWidth, screenHeight)
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ebiten.SetScreenScale(screenScale)
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if ebiten.IsRunningSlowly() {
return nil
}
screen.Fill(color.RGBA{0x80, 0x80, 0xc0, 0xff})
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w, h := gophersImage.Size()
w2, h2 := screen.Size()
op := &ebiten.DrawImageOptions{}
op.GeoM.Translate(float64(-w+w2)/2, float64(-h+h2)/2)
screen.DrawImage(gophersImage, op)
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x, y := ebiten.CursorPosition()
msg := fmt.Sprintf(`Press arrow keys to change the window size
Press S key to change the window scale
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Cursor: (%d, %d)
FPS: %0.2f`, x, y, ebiten.CurrentFPS())
ebitenutil.DebugPrint(screen, msg)
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return nil
}
func main() {
var err error
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gophersImage, _, err = ebitenutil.NewImageFromFile("_resources/images/gophers.jpg", ebiten.FilterNearest)
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if err != nil {
log.Fatal(err)
}
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if err := ebiten.Run(update, initScreenWidth, initScreenHeight, initScreenScale, "Window Size (Ebiten Demo)"); err != nil {
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log.Fatal(err)
}
}