mirror of
https://github.com/hajimehoshi/ebiten.git
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139 lines
3.3 KiB
Go
139 lines
3.3 KiB
Go
// Copyright 2018 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// This example is an experiment to minify images with various filters.
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// When linear filter is used, mipmap images should be used for high-quality rendering (#578).
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package main
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import (
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"bytes"
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"image"
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_ "image/jpeg"
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"log"
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"math"
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"github.com/ebitengine/debugui"
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"github.com/hajimehoshi/ebiten/v2"
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"github.com/hajimehoshi/ebiten/v2/examples/resources/images"
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)
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const (
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screenWidth = 1000
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screenHeight = 640
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)
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var (
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gophersImage *ebiten.Image
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)
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type Game struct {
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debugui debugui.DebugUI
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rotate bool
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clip bool
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autoScale bool
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counter int
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scale float64
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}
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func (g *Game) Update() error {
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if g.scale == 0 {
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g.scale = 1
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}
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g.counter++
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if g.counter == 480 {
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g.counter = 0
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}
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if g.autoScale {
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g.scale = 1.5 / math.Pow(1.01, float64(g.counter))
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}
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if _, err := g.debugui.Update(func(ctx *debugui.Context) error {
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ctx.Window("Control", image.Rect(10, 10, 260, 160), func(layout debugui.ContainerLayout) {
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ctx.SetGridLayout([]int{-1, -2}, nil)
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ctx.Text("Rotate")
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ctx.Checkbox(&g.rotate, "")
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ctx.Text("Clip")
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ctx.Checkbox(&g.clip, "")
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ctx.Text("Scale")
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ctx.SliderF(&g.scale, 0.01, 2, 0.01, 2)
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ctx.Text("Auto Scale")
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ctx.Checkbox(&g.autoScale, "")
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})
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ctx.Window("Info", image.Rect(270, 10, 520, 160), func(layout debugui.ContainerLayout) {
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ctx.Text("Minifying Images\nLeft: Nearest filter\nCenter: Linear filter (w/ mipmaps)\nRight: Linear Filter (w/o mipmaps)")
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})
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return nil
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}); err != nil {
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return err
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}
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return nil
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}
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func (g *Game) Draw(screen *ebiten.Image) {
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s := g.scale
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clippedGophersImage := gophersImage.SubImage(image.Rect(100, 100, 200, 200)).(*ebiten.Image)
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for i := range 3 {
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w, h := gophersImage.Bounds().Dx(), gophersImage.Bounds().Dy()
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op := &ebiten.DrawImageOptions{}
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if g.rotate {
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op.GeoM.Translate(-float64(w)/2, -float64(h)/2)
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op.GeoM.Rotate(float64(g.counter) / 300 * 2 * math.Pi)
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op.GeoM.Translate(float64(w)/2, float64(h)/2)
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}
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op.GeoM.Scale(s, s)
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op.GeoM.Translate(32+float64(i*w)*s+float64(i*4), 200)
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if i == 0 {
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op.Filter = ebiten.FilterNearest
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} else {
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op.Filter = ebiten.FilterLinear
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}
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if i == 2 {
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op.DisableMipmaps = true
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}
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if g.clip {
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screen.DrawImage(clippedGophersImage, op)
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} else {
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screen.DrawImage(gophersImage, op)
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}
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}
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g.debugui.Draw(screen)
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}
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func (g *Game) Layout(outsideWidth, outsideHeight int) (int, int) {
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return screenWidth, screenHeight
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}
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func main() {
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// Decode an image from the image file's byte slice.
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img, _, err := image.Decode(bytes.NewReader(images.Gophers_jpg))
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if err != nil {
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log.Fatal(err)
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}
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gophersImage = ebiten.NewImageFromImage(img)
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ebiten.SetWindowSize(screenWidth, screenHeight)
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ebiten.SetWindowTitle("Minify (Ebitengine Demo)")
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if err := ebiten.RunGame(&Game{}); err != nil {
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log.Fatal(err)
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}
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}
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