ebiten/examples/filter/main.go
2022-11-03 20:24:09 +09:00

80 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.
package main
import (
"bytes"
"image"
_ "image/png"
"log"
"github.com/hajimehoshi/ebiten/v2"
"github.com/hajimehoshi/ebiten/v2/ebitenutil"
"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
)
const (
screenWidth = 640
screenHeight = 480
)
var (
ebitenImage *ebiten.Image
)
type Game struct {
}
func (g *Game) Update() error {
return nil
}
func (g *Game) Draw(screen *ebiten.Image) {
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)
}
func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
return screenWidth, screenHeight
}
func main() {
// Decode an image from the image file's byte slice.
img, _, err := image.Decode(bytes.NewReader(images.Ebiten_png))
if err != nil {
log.Fatal(err)
}
ebitenImage = ebiten.NewImageFromImage(img)
ebiten.SetWindowSize(screenWidth, screenHeight)
ebiten.SetWindowTitle("Filter (Ebitengine Demo)")
if err := ebiten.RunGame(&Game{}); err != nil {
log.Fatal(err)
}
}