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"
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"image"
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"image/color"
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_ "image/jpeg"
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"log"
"math"
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"math/rand"
"time"
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"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
"github.com/hajimehoshi/ebiten/inpututil"
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)
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func init() {
rand.Seed(time.Now().UnixNano())
}
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const (
initScreenWidth = 320
initScreenHeight = 240
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initScreenScale = 2
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)
var (
gophersImage *ebiten.Image
count = 0
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)
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func createRandomIconImage() image.Image {
const size = 32
r := uint8(rand.Intn(0x100))
g := uint8(rand.Intn(0x100))
b := uint8(rand.Intn(0x100))
img := image.NewNRGBA(image.Rect(0, 0, size, size))
for j := 0; j < size; j++ {
for i := 0; i < size; i++ {
img.Pix[j*img.Stride+4*i] = r
img.Pix[j*img.Stride+4*i+1] = g
img.Pix[j*img.Stride+4*i+2] = b
img.Pix[j*img.Stride+4*i+3] = uint8(float64(i+j) / float64(2*size) * 0xff)
}
}
return img
}
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func update(screen *ebiten.Image) error {
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screenScale := ebiten.ScreenScale()
d := int(32 / screenScale)
screenWidth, screenHeight := screen.Size()
fullscreen := ebiten.IsFullscreen()
runnableInBackground := ebiten.IsRunnableInBackground()
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cursorVisible := ebiten.IsCursorVisible()
if inpututil.IsKeyJustPressed(ebiten.KeyUp) {
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screenHeight += d
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}
if inpututil.IsKeyJustPressed(ebiten.KeyDown) {
if 16 < screenHeight && d < screenHeight {
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screenHeight -= d
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}
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}
if inpututil.IsKeyJustPressed(ebiten.KeyLeft) {
if 16 < screenWidth && d < screenWidth {
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screenWidth -= d
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}
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}
if inpututil.IsKeyJustPressed(ebiten.KeyRight) {
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screenWidth += d
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}
if inpututil.IsKeyJustPressed(ebiten.KeyS) {
switch screenScale {
case 1:
screenScale = 1.5
case 1.5:
screenScale = 2
case 2:
screenScale = 1
default:
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panic("not reached")
}
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}
if inpututil.IsKeyJustPressed(ebiten.KeyF) {
fullscreen = !fullscreen
}
if inpututil.IsKeyJustPressed(ebiten.KeyB) {
runnableInBackground = !runnableInBackground
}
if inpututil.IsKeyJustPressed(ebiten.KeyC) {
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cursorVisible = !cursorVisible
}
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ebiten.SetScreenSize(screenWidth, screenHeight)
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ebiten.SetScreenScale(screenScale)
ebiten.SetFullscreen(fullscreen)
ebiten.SetRunnableInBackground(runnableInBackground)
ebiten.SetCursorVisible(cursorVisible)
if inpututil.IsKeyJustPressed(ebiten.KeyI) {
ebiten.SetWindowIcon([]image.Image{createRandomIconImage()})
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}
count++
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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)
dx := math.Cos(2*math.Pi*float64(count)/360) * 10
dy := math.Sin(2*math.Pi*float64(count)/360) * 10
op.GeoM.Translate(dx, dy)
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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Press F key to switch the fullscreen state
Press B key to switch the run-in-background state
Press C key to switch the cursor visibility
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Press I key to change the window icon
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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() {
fmt.Printf("Device scale factor: %0.2f\n", ebiten.DeviceScaleFactor())
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var err error
gophersImage, _, err = ebitenutil.NewImageFromFile("_resources/images/gophers.jpg", ebiten.FilterNearest)
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if err != nil {
log.Fatal(err)
}
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ebiten.SetWindowIcon([]image.Image{createRandomIconImage()})
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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)
}
}