ebiten/examples/filter/main.go
2018-03-15 01:26:21 +09:00

76 lines
1.9 KiB
Go

// 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
package main
import (
"bytes"
"image"
_ "image/png"
"log"
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
"github.com/hajimehoshi/ebiten/examples/resources/images"
)
const (
screenWidth = 640
screenHeight = 480
)
var (
ebitenImage *ebiten.Image
)
func update(screen *ebiten.Image) error {
if ebiten.IsRunningSlowly() {
return nil
}
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)
return nil
}
func main() {
// 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.
img, _, err := image.Decode(bytes.NewReader(images.Ebiten_png))
if err != nil {
log.Fatal(err)
}
ebitenImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
if err := ebiten.Run(update, screenWidth, screenHeight, 1, "Filter (Ebiten Demo)"); err != nil {
log.Fatal(err)
}
}