ebiten/examples/minify/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.
// This example is an experiment to minify images with various filters.
// When linear filter is used, mipmap images should be used for high-quality rendering (#578).
package main
import (
"bytes"
"fmt"
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"image"
_ "image/jpeg"
"log"
"math"
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"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
"github.com/hajimehoshi/ebiten/v2/inpututil"
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)
const (
screenWidth = 800
screenHeight = 480
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)
var (
gophersImage *ebiten.Image
)
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type Game struct {
rotate bool
clip bool
counter int
}
func (g *Game) Update() error {
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g.counter++
if g.counter == 480 {
g.counter = 0
}
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if inpututil.IsKeyJustPressed(ebiten.KeyR) {
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g.rotate = !g.rotate
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}
if inpututil.IsKeyJustPressed(ebiten.KeyC) {
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g.clip = !g.clip
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}
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return nil
}
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func (g *Game) Draw(screen *ebiten.Image) {
s := 1.5 / math.Pow(1.01, float64(g.counter))
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clippedGophersImage := gophersImage.SubImage(image.Rect(100, 100, 200, 200)).(*ebiten.Image)
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for i, f := range []ebiten.Filter{ebiten.FilterNearest, ebiten.FilterLinear} {
w, h := gophersImage.Bounds().Dx(), gophersImage.Bounds().Dy()
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op := &ebiten.DrawImageOptions{}
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if g.rotate {
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op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
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op.GeoM.Rotate(float64(g.counter) / 300 * 2 * math.Pi)
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op.GeoM.Translate(float64(w)/2, float64(h)/2)
}
op.GeoM.Scale(s, s)
op.GeoM.Translate(32+float64(i*w)*s+float64(i*4), 64)
op.Filter = f
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if g.clip {
screen.DrawImage(clippedGophersImage, op)
} else {
screen.DrawImage(gophersImage, op)
}
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}
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msg := fmt.Sprintf(`Minifying images (Nearest filter vs Linear filter):
Press R to rotate the images.
Press C to clip the images.
Scale: %0.2f`, s)
ebitenutil.DebugPrint(screen, msg)
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}
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func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
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}
func main() {
// Decode an image from the image file's byte slice.
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img, _, err := image.Decode(bytes.NewReader(images.Gophers_jpg))
if err != nil {
log.Fatal(err)
}
gophersImage = ebiten.NewImageFromImage(img)
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ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("Minify (Ebitengine Demo)")
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if err := ebiten.RunGame(&Game{}); err != nil {
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log.Fatal(err)
}
}