ebiten/examples/filter/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.
// +build example jsgo
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package main
import (
"bytes"
"image"
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_ "image/png"
"log"
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
"github.com/hajimehoshi/ebiten/examples/resources/images"
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)
const (
screenWidth = 640
screenHeight = 480
)
var (
ebitenImage *ebiten.Image
)
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type Game struct {
}
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func (g *Game) Update(screen *ebiten.Image) error {
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
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ebitenutil.DebugPrint(screen, "Nearest Filter (default) VS Linear Filter")
op := &ebiten.DrawImageOptions{}
op.GeoM.Scale(4, 4)
op.GeoM.Translate(64, 64)
// By default, nearest filter is used.
screen.DrawImage(ebitenImage, op)
op = &ebiten.DrawImageOptions{}
op.GeoM.Scale(4, 4)
op.GeoM.Translate(64, 64+240)
// Specify linear filter.
op.Filter = ebiten.FilterLinear
screen.DrawImage(ebitenImage, op)
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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 image from a byte slice instead of a file so that
// this example works in any working directory.
// If you want to use a file, there are some options:
// 1) Use os.Open and pass the file to the image decoder.
// This is a very regular way, but doesn't work on browsers.
// 2) Use ebitenutil.OpenFile and pass the file to the image decoder.
// This works even on browsers.
// 3) Use ebitenutil.NewImageFromFile to create an ebiten.Image directly from a file.
// This also works on browsers.
img, _, err := image.Decode(bytes.NewReader(images.Ebiten_png))
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if err != nil {
log.Fatal(err)
}
// Specifying filter on NewImage[FromImage] is just for backward compatibility.
// Now specifying filter at DrawImageOptions is recommended.
// Specify FilterDefault here, that means to prefer filter specified at DrawImageOptions.
ebitenImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("Filter (Ebiten Demo)")
if err := ebiten.RunGame(&Game{}); err != nil {
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log.Fatal(err)
}
}