ebiten/examples/minify/main.go

119 lines
3.0 KiB
Go
Raw Normal View History

2018-07-29 11:56:58 +02:00
// 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.
2021-06-24 14:49:37 +02:00
//go:build example
2020-10-06 17:45:54 +02:00
// +build example
2018-07-29 11:56:58 +02:00
// 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"
2018-07-29 11:56:58 +02:00
"image"
_ "image/jpeg"
"log"
"math"
2020-10-03 19:35:13 +02:00
"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"
2018-07-29 11:56:58 +02:00
)
const (
screenWidth = 800
screenHeight = 480
2018-07-29 11:56:58 +02:00
)
var (
gophersImage *ebiten.Image
)
2020-05-11 19:11:09 +02:00
type Game struct {
rotate bool
clip bool
counter int
}
func (g *Game) Update() error {
2020-05-11 19:11:09 +02:00
g.counter++
if g.counter == 480 {
g.counter = 0
}
2018-07-29 16:24:18 +02:00
if inpututil.IsKeyJustPressed(ebiten.KeyR) {
2020-05-11 19:11:09 +02:00
g.rotate = !g.rotate
2018-07-29 16:24:18 +02:00
}
if inpututil.IsKeyJustPressed(ebiten.KeyC) {
2020-05-11 19:11:09 +02:00
g.clip = !g.clip
2018-07-29 11:56:58 +02:00
}
2020-05-11 19:11:09 +02:00
return nil
}
2018-07-29 11:56:58 +02:00
2020-05-11 19:11:09 +02:00
func (g *Game) Draw(screen *ebiten.Image) {
s := 1.5 / math.Pow(1.01, float64(g.counter))
2018-07-29 11:56:58 +02:00
2018-11-08 17:08:32 +01:00
clippedGophersImage := gophersImage.SubImage(image.Rect(100, 100, 200, 200)).(*ebiten.Image)
2018-07-29 11:56:58 +02:00
for i, f := range []ebiten.Filter{ebiten.FilterNearest, ebiten.FilterLinear} {
2018-07-29 16:24:18 +02:00
w, h := gophersImage.Size()
2018-07-29 11:56:58 +02:00
op := &ebiten.DrawImageOptions{}
2020-05-11 19:11:09 +02:00
if g.rotate {
2018-07-29 16:24:18 +02:00
op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
2020-05-11 19:11:09 +02:00
op.GeoM.Rotate(float64(g.counter) / 300 * 2 * math.Pi)
2018-07-29 16:24:18 +02:00
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
2020-05-11 19:11:09 +02:00
if g.clip {
screen.DrawImage(clippedGophersImage, op)
} else {
screen.DrawImage(gophersImage, op)
}
2018-07-29 11:56:58 +02:00
}
2022-04-09 16:27:51 +02:00
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)
2020-05-11 19:11:09 +02:00
}
2018-07-29 11:56:58 +02:00
2020-05-11 19:11:09 +02:00
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
2018-07-29 11:56:58 +02:00
}
func main() {
// Decode an image from the image file's byte slice.
// Now the byte slice is generated with //go:generate for Go 1.15 or older.
2021-09-20 08:16:09 +02:00
// If you use Go 1.16 or newer, it is strongly recommended to use //go:embed to embed the image file.
// See https://pkg.go.dev/embed for more details.
2018-07-29 11:56:58 +02:00
img, _, err := image.Decode(bytes.NewReader(images.Gophers_jpg))
if err != nil {
log.Fatal(err)
}
gophersImage = ebiten.NewImageFromImage(img)
2018-07-29 11:56:58 +02:00
2020-05-11 19:11:09 +02:00
ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("Minify (Ebiten Demo)")
if err := ebiten.RunGame(&Game{}); err != nil {
2018-07-29 11:56:58 +02:00
log.Fatal(err)
}
}