124 lines
1.7 KiB
Go
124 lines
1.7 KiB
Go
package main
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import (
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"log"
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"time"
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"github.com/faiface/pixel"
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"github.com/faiface/pixel/imdraw"
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"github.com/faiface/pixel/pixelgl"
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"golang.org/x/image/colornames"
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)
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func run() {
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cfg := pixelgl.WindowConfig{
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Title: "Relay",
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Bounds: pixel.R(0, 0, 2048, 512),
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VSync: true,
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}
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w, err := pixelgl.NewWindow(cfg)
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if err != nil {
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panic(err)
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}
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s := newState()
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start := time.Now()
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for !w.Closed() && !s.won {
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w.Clear(colornames.Peru)
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s = updateState(s)
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render(s, w, time.Since(start))
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w.Update()
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if s.won {
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log.Println("You win!")
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}
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}
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}
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func main() {
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pixelgl.Run(run)
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}
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func render(s state, w *pixelgl.Window, d time.Duration) {
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b := w.Bounds()
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i := imdraw.New(nil)
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offset := b.Size().X / steps
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for _, bot := range s.bots {
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if bot.active {
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i.Color = pixel.RGB(0, 1, 0)
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} else {
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i.Color = pixel.RGB(1, 0, 0)
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}
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from := pixel.V(b.Min.X+25, b.Center().Y)
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pos := from.Add(pixel.V(float64(bot.pos)*offset, 0))
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i.Push(pos)
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i.Clear()
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i.Circle(50, 0)
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i.Draw(w)
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}
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}
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type state struct {
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bots []bot
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won bool
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}
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func newState() state {
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return state{
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bots: []bot{
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{pos: 0, active: true},
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{pos: steps / 2},
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},
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}
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}
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type bot struct {
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pos int
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active bool
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}
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func updateState(sOld state) state {
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s := sOld
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var active *bot
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for i := range s.bots {
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if !s.bots[i].active {
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continue
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}
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active = &s.bots[i]
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}
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active.pos++
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maybePassBaton(active, &s)
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if won(*active, s) {
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s.won = true
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}
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return s
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}
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func maybePassBaton(b *bot, s *state) {
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for i, bb := range s.bots {
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if b == &bb {
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continue
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}
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if bb.pos-b.pos == 1 {
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b.active = false
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s.bots[i].active = true
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return
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}
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}
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}
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func won(b bot, s state) bool {
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return b.pos == steps
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}
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const steps = 150
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