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// http://fabiensanglard.net/doom_fire_psx/
package main
import (
"errors"
"fmt"
"image"
"image/color"
"log"
"math/rand"
"time"
"github.com/disintegration/imaging"
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil"
"github.com/hajimehoshi/ebiten/inpututil"
)
var palette = color.Palette{
color.RGBA{0x07, 0x07, 0x07, 0xff},
color.RGBA{0x1f, 0x07, 0x07, 0xff},
color.RGBA{0x2f, 0x0f, 0x07, 0xff},
color.RGBA{0x47, 0x0f, 0x07, 0xff},
color.RGBA{0x57, 0x17, 0x07, 0xff},
color.RGBA{0x67, 0x1f, 0x07, 0xff},
color.RGBA{0x77, 0x1f, 0x07, 0xff},
color.RGBA{0x8f, 0x27, 0x07, 0xff},
color.RGBA{0x9f, 0x2f, 0x07, 0xff},
color.RGBA{0xaf, 0x3f, 0x07, 0xff},
color.RGBA{0xbf, 0x47, 0x07, 0xff},
color.RGBA{0xc7, 0x47, 0x07, 0xff},
color.RGBA{0xdf, 0x4f, 0x07, 0xff},
color.RGBA{0xdf, 0x57, 0x07, 0xff},
color.RGBA{0xdf, 0x57, 0x07, 0xff},
color.RGBA{0xd7, 0x5f, 0x07, 0xff},
color.RGBA{0xd7, 0x67, 0x0f, 0xff},
color.RGBA{0xcf, 0x6f, 0x0f, 0xff},
color.RGBA{0xcf, 0x77, 0x0f, 0xff},
color.RGBA{0xcf, 0x7f, 0x0f, 0xff},
color.RGBA{0xcf, 0X87, 0x17, 0xff},
color.RGBA{0xc7, 0x87, 0x17, 0xff},
color.RGBA{0xc7, 0x8f, 0x17, 0xff},
color.RGBA{0xc7, 0x97, 0x1f, 0xff},
color.RGBA{0xbf, 0X9f, 0X1f, 0xff},
color.RGBA{0xbf, 0x9f, 0x1f, 0xff},
color.RGBA{0xbf, 0xa7, 0x27, 0xff},
color.RGBA{0xbf, 0xa7, 0x27, 0xff},
color.RGBA{0xbf, 0xaf, 0x2f, 0xff},
color.RGBA{0xb7, 0xaf, 0x2f, 0xff},
color.RGBA{0xb7, 0xb7, 0x2f, 0xff},
color.RGBA{0xb7, 0xb7, 0x37, 0xff},
color.RGBA{0xcf, 0xcf, 0x6f, 0xff},
color.RGBA{0xdf, 0xdf, 0x9f, 0xff},
color.RGBA{0xef, 0xef, 0xc7, 0xff},
color.RGBA{0xff, 0xff, 0xff, 0xff},
}
const (
screenWidth = 320
screenHeight = 200
scale = 2
)
type drawContext struct {
img *image.Paletted
isOn bool
debug bool
}
func newDrawContext(x, y int) *drawContext {
rand.Seed(time.Now().UnixNano())
img := image.NewPaletted(image.Rect(0, 0, x, y), palette)
return &drawContext{img: img}
}
func (dc *drawContext) toggle() *drawContext {
var c uint8
if !dc.isOn {
c = uint8(len(palette) - 1)
}
for x := 0; x < screenWidth; x++ {
dc.img.SetColorIndex(x, 0, c)
}
dc.isOn = !dc.isOn
return dc
}
func (dc *drawContext) update(screen *ebiten.Image) error {
switch {
case inpututil.IsKeyJustPressed(ebiten.KeyQ):
return errors.New("exit")
case inpututil.IsKeyJustPressed(ebiten.KeyD):
dc.debug = !dc.debug
case inpututil.IsKeyJustPressed(ebiten.KeySpace):
dc.toggle()
}
for x := 0; x < dc.img.Bounds().Max.X; x++ {
for y := 1; y < dc.img.Bounds().Max.Y; y++ {
z := rand.Intn(3)
n := dc.img.ColorIndexAt(x, y-1)
if n > 0 && z == 1 {
n--
}
dc.img.SetColorIndex(x-z+1, y, n)
}
}
if !ebiten.IsDrawingSkipped() {
screen.ReplacePixels(imaging.FlipV(dc.img).Pix)
if dc.debug {
ebitenutil.DebugPrint(screen, fmt.Sprintf("TPS: %0.2f", ebiten.CurrentTPS()))
}
}
return nil
}
func main() {
dc := newDrawContext(screenWidth, screenHeight).toggle()
ebiten.SetRunnableInBackground(true)
if err := ebiten.Run(dc.update, screenWidth, screenHeight, scale, "Fire"); err != nil {
log.Fatal(err)
}
}
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