ebiten/examples/moire/main.go

130 lines
2.7 KiB
Go

// 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
package main
import (
"log"
"github.com/hajimehoshi/ebiten"
)
const (
initScreenWidth = 640
initScreenHeight = 480
initScreenScale = 1
)
var (
gophersImage *ebiten.Image
keyStates = map[ebiten.Key]int{
ebiten.KeyUp: 0,
ebiten.KeyDown: 0,
ebiten.KeyLeft: 0,
ebiten.KeyRight: 0,
ebiten.KeyS: 0,
ebiten.KeyF: 0,
}
)
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 {
for key := range keyStates {
if !ebiten.IsKeyPressed(key) {
keyStates[key] = 0
continue
}
keyStates[key]++
}
screenScale := ebiten.ScreenScale()
d := int(32 / screenScale)
screenWidth, screenHeight := screen.Size()
fullscreen := ebiten.IsFullscreen()
if keyStates[ebiten.KeyUp] == 1 {
screenHeight += d
}
if keyStates[ebiten.KeyDown] == 1 {
if 16 < screenHeight && d < screenHeight {
screenHeight -= d
}
}
if keyStates[ebiten.KeyLeft] == 1 {
if 16 < screenWidth && d < screenWidth {
screenWidth -= d
}
}
if keyStates[ebiten.KeyRight] == 1 {
screenWidth += d
}
if keyStates[ebiten.KeyS] == 1 {
switch screenScale {
case 1:
screenScale = 1.5
case 1.5:
screenScale = 2
case 2:
screenScale = 1
default:
panic("not reached")
}
}
if keyStates[ebiten.KeyF] == 1 {
fullscreen = !fullscreen
}
ebiten.SetScreenSize(screenWidth, screenHeight)
ebiten.SetScreenScale(screenScale)
ebiten.SetFullscreen(fullscreen)
if ebiten.IsRunningSlowly() {
return nil
}
screen.ReplacePixels(getDots(screen.Size()))
return nil
}
func main() {
if err := ebiten.Run(update, initScreenWidth, initScreenHeight, initScreenScale, "Moire (Ebiten Demo)"); err != nil {
log.Fatal(err)
}
}