ebiten/examples/moire/main.go

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// Copyright 2017 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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// This example is just to check if Ebiten can draw fine checker pattern evenly.
// If there is something wrong in the implementation, the result might include
// uneven patterns (#459).
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package main
import (
"log"
"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/inpututil"
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)
const (
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screenWidth = 640
screenHeight = 480
initScreenScale = 1
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)
var (
dots []uint8
dotsWidth int
dotsHeight int
)
func getDots(width, height int) []uint8 {
if dotsWidth == width && dotsHeight == height {
return dots
}
dotsWidth = width
dotsHeight = height
dots = make([]uint8, width*height*4)
for j := 0; j < height; j++ {
for i := 0; i < width; i++ {
if (i+j)%2 == 0 {
dots[(i+j*width)*4+0] = 0xff
dots[(i+j*width)*4+1] = 0xff
dots[(i+j*width)*4+2] = 0xff
dots[(i+j*width)*4+3] = 0xff
}
}
}
return dots
}
func update(screen *ebiten.Image) error {
screenScale := ebiten.ScreenScale()
fullscreen := ebiten.IsFullscreen()
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if inpututil.IsKeyJustPressed(ebiten.KeyS) {
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switch screenScale {
case 1:
screenScale = 1.5
case 1.5:
screenScale = 2
case 2:
screenScale = 1
default:
panic("not reached")
}
}
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if inpututil.IsKeyJustPressed(ebiten.KeyF) {
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fullscreen = !fullscreen
}
ebiten.SetScreenScale(screenScale)
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ebiten.SetFullscreen(fullscreen)
if ebiten.IsDrawingSkipped() {
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return nil
}
screen.ReplacePixels(getDots(screen.Size()))
return nil
}
func main() {
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if err := ebiten.Run(update, screenWidth, screenHeight, initScreenScale, "Moire (Ebiten Demo)"); err != nil {
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log.Fatal(err)
}
}