mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 03:38:55 +01:00
77 lines
1.9 KiB
Go
77 lines
1.9 KiB
Go
// Copyright 2014 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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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil"
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_ "image/jpeg"
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"log"
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"math"
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)
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const (
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screenWidth = 320
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screenHeight = 240
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)
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var (
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count int
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horizontalCount int
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verticalCount int
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gophersImage *ebiten.Image
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)
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func update(screen *ebiten.Image) error {
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count++
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if ebiten.IsKeyPressed(ebiten.KeyLeft) {
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horizontalCount--
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}
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if ebiten.IsKeyPressed(ebiten.KeyRight) {
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horizontalCount++
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}
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if ebiten.IsKeyPressed(ebiten.KeyDown) {
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verticalCount--
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}
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if ebiten.IsKeyPressed(ebiten.KeyUp) {
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verticalCount++
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}
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w, h := gophersImage.Size()
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geo := ebiten.TranslateGeometry(-float64(w)/2, -float64(h)/2)
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scaleX := math.Pow(1.05, float64(horizontalCount))
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scaleY := math.Pow(1.05, float64(verticalCount))
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geo.Concat(ebiten.ScaleGeometry(scaleX, scaleY))
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geo.Concat(ebiten.RotateGeometry(float64(count%720) * 2 * math.Pi / 720))
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geo.Concat(ebiten.TranslateGeometry(screenWidth/2, screenHeight/2))
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if err := screen.DrawImage(gophersImage, &ebiten.DrawImageOptions{
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GeometryMatrix: geo,
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}); err != nil {
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return err
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}
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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, screenWidth, screenHeight, 2, "Image (Ebiten Demo)"); err != nil {
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log.Fatal(err)
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}
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}
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