mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 03:38:55 +01:00
112 lines
2.6 KiB
Go
112 lines
2.6 KiB
Go
// Copyright 2015 Hajime Hoshi
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package main
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import (
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"fmt"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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"image/color"
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_ "image/jpeg"
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"log"
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)
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const (
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initScreenWidth = 320
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initScreenHeight = 240
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initScreenScale = 2
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)
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var (
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gophersImage *ebiten.Image
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screenWidth = initScreenWidth
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screenHeight = initScreenHeight
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screenScale = initScreenScale
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keyStates = map[ebiten.Key]int{
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ebiten.KeyUp: 0,
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ebiten.KeyDown: 0,
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ebiten.KeyLeft: 0,
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ebiten.KeyRight: 0,
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ebiten.KeyS: 0,
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}
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)
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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) {
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keyStates[key] = 0
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continue
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}
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keyStates[key]++
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}
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d := 0
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switch screenScale {
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case 1:
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d = 32
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case 2:
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d = 16
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}
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if keyStates[ebiten.KeyUp] == 1 {
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screenHeight += d
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}
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if keyStates[ebiten.KeyDown] == 1 {
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if 16 < screenHeight {
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screenHeight -= d
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}
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}
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if keyStates[ebiten.KeyLeft] == 1 {
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if 16 < screenWidth {
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screenWidth -= d
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}
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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 {
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screenScale = 3 - screenScale // Swap 1 and 2
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}
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ebiten.SetScreenSize(screenWidth, screenHeight)
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ebiten.SetScreenScale(screenScale)
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screen.Fill(color.RGBA{0x80, 0x80, 0xc0, 0xff})
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w, h := gophersImage.Size()
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w2, h2 := screen.Size()
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op := &ebiten.DrawImageOptions{}
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op.GeoM.Translate(float64(-w+w2)/2, float64(-h+h2)/2)
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if err := screen.DrawImage(gophersImage, op); err != nil {
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return err
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}
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x, y := ebiten.CursorPosition()
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msg := fmt.Sprintf(`Press arrow keys to change the window size
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Press S key to change the window scale
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Cursor: (%d, %d)
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FPS: %0.2f`, x, y, ebiten.CurrentFPS())
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ebitenutil.DebugPrint(screen, msg)
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return nil
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}
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func main() {
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var err error
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gophersImage, _, err = ebitenutil.NewImageFromFile("images/gophers.jpg", ebiten.FilterNearest)
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if err != nil {
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log.Fatal(err)
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}
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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)
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}
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}
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