ebiten/examples/mosaic/main.go
2022-11-03 12:55:14 +09:00

85 lines
2.0 KiB
Go

// Copyright 2014 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.
//go:build example
package main
import (
"bytes"
"image"
_ "image/jpeg"
"log"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
)
const (
screenWidth = 320
screenHeight = 240
)
const mosaicRatio = 16
var (
gophersImage *ebiten.Image
)
func init() {
// Decode an image from the image file's byte slice.
img, _, err := image.Decode(bytes.NewReader(images.Gophers_jpg))
if err != nil {
log.Fatal(err)
}
gophersImage = ebiten.NewImageFromImage(img)
}
type Game struct {
gophersRenderTarget *ebiten.Image
}
func (g *Game) Update() error {
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
// Shrink the image once.
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(1.0/mosaicRatio, 1.0/mosaicRatio)
g.gophersRenderTarget.DrawImage(gophersImage, op)
// Enlarge the shrunk image.
// The filter is the nearest filter, so the result will be mosaic.
op = &ebiten.DrawImageOptions{}
op.GeoM.Scale(mosaicRatio, mosaicRatio)
screen.DrawImage(g.gophersRenderTarget, op)
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
}
func main() {
w, h := gophersImage.Size()
g := &Game{
gophersRenderTarget: ebiten.NewImage(w/mosaicRatio, h/mosaicRatio),
}
ebiten.SetWindowSize(screenWidth*2, screenHeight*2)
ebiten.SetWindowTitle("Mosaic (Ebitengine Demo)")
if err := ebiten.RunGame(g); err != nil {
log.Fatal(err)
}
}