first commit

LICENSE

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+MIT License
+
+Copyright (c) 2019 y-hatano-github
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+![gocandle](gocandle.gif)
+
+# What is this?
+Fire effect written in Golang.
+Seeing fire make you feel calm.
+
+## How to get and run the code.
+### 1st step
+Get the code.
+```
+go get -d github.com/y-hatano-github/go-candle
+```
+### 2nd step
+Change directory to the source code directory.
+```
+cd $GOPATH/src/github.com/y-hatano-github/go-candle
+```
+### 3rd step
+Run the code.
+```
+go run main.go
+```
+
+## Key bindings
+[esc / CTRL+C] - exit<br>
+
+## Win/Mac/Linux binary
+https://github.com/y-hatano-github/go-candle/releases/

go.mod

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+module github.com/y-hatano-github/go-candle
+
+go 1.12
+
+require (
+	github.com/mattn/go-runewidth v0.0.7 // indirect
+	github.com/nsf/termbox-go v0.0.0-20190817171036-93860e161317
+)

go.sum

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+github.com/mattn/go-runewidth v0.0.7 h1:Ei8KR0497xHyKJPAv59M1dkC+rOZCMBJ+t3fZ+twI54=
+github.com/mattn/go-runewidth v0.0.7/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
+github.com/nsf/termbox-go v0.0.0-20190817171036-93860e161317 h1:hhGN4SFXgXo61Q4Sjj/X9sBjyeSa2kdpaOzCO+8EVQw=
+github.com/nsf/termbox-go v0.0.0-20190817171036-93860e161317/go.mod h1:IuKpRQcYE1Tfu+oAQqaLisqDeXgjyyltCfsaoYN18NQ=

main.go

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+package main
+
+import (
+	"github.com/nsf/termbox-go"
+	"math/rand"
+	//	"strconv"
+	"time"
+)
+
+const WIDTH = 16
+const HEIGHT = 16
+const FLUCTUATION = 5
+
+func main() {
+	var m [WIDTH][HEIGHT]int
+	for y := 0; y < HEIGHT; y++ {
+		for x := 0; x < WIDTH; x++ {
+			m[x][y] = 0
+		}
+	}
+
+	colors := ([]termbox.Attribute{
+		0,
+		197,
+		203,
+		209,
+		215,
+		221,
+		227,
+		228,
+		229,
+		230,
+		231})
+
+	rand.Seed(time.Now().UnixNano())
+
+	err := termbox.Init()
+	if err != nil {
+		panic(err)
+	}
+	defer termbox.Close()
+	termbox.SetOutputMode(termbox.Output256)
+	termbox.Clear(termbox.ColorDefault, termbox.ColorDefault)
+
+	ch := make(chan termbox.Event)
+	go keyEvent(ch)
+
+loop:
+	for {
+
+		select {
+		case ev := <-ch:
+			switch ev.Type {
+			case termbox.EventKey:
+				if ev.Key == termbox.KeyCtrlC || ev.Key == termbox.KeyEsc {
+					break loop
+				}
+			}
+			break
+		default:
+			termbox.Clear(termbox.ColorDefault, termbox.ColorDefault)
+			fire(&m, colors)
+			drawFire(m, colors)
+			termbox.Flush()
+		}
+	}
+}
+
+func fire(m *[WIDTH][HEIGHT]int, colors []termbox.Attribute) {
+	for x := 0; x < WIDTH; x++ {
+		for y := 0; y < HEIGHT; y++ {
+
+			if y < HEIGHT-2 {
+				if x == WIDTH-1 {
+					m[x][y] = (m[x][y] + m[x-1][y+1] + m[x][y+1] + m[x][y+2]) / 5
+				} else if x == 0 {
+					m[x][y] = (m[x][y] + m[x][y+1] + m[x+1][y+1] + m[x][y+2]) / 5
+				} else {
+					m[x][y] = (m[x][y] + m[x-1][y+1] + m[x][y+1] + m[x+1][y+1] + m[x][y+2]) / 5
+				}
+			} else if y < HEIGHT-1 {
+				if x == WIDTH-1 {
+					m[x][y] = (m[x][y] + m[x-1][y+1] + m[x][y+1]) / 5
+				} else if x == 0 {
+					m[x][y] = (m[x][y] + m[x][y+1] + m[x+1][y+1]) / 5
+				} else if x < 3 || x > WIDTH-4 {
+					m[x][y] = (m[x][y] + m[x-1][y+1] + m[x][y+1] + m[x+1][y+1]) / 5
+				}
+			} else {
+				if x < 3 || x > WIDTH-4 {
+					m[x][y] = m[x][y] / 5
+				}
+			}
+			if rand.Intn(FLUCTUATION) == 1 {
+				m[x][y] = m[x][y] - 1
+			}
+			if m[x][y] < 0 {
+				m[x][y] = 0
+			}
+		}
+	}
+
+	for x := 5; x < WIDTH-5; x++ {
+		m[x][HEIGHT-1] = rand.Intn(3) + len(colors) - 3
+
+	}
+	for x := 4; x < WIDTH-4; x++ {
+		m[x][HEIGHT-2] = rand.Intn(3) + len(colors) - 3
+	}
+
+}
+
+func keyEvent(ch chan termbox.Event) {
+	for {
+		ch <- termbox.PollEvent()
+	}
+}
+
+func drawFire(m [WIDTH][HEIGHT]int, colors []termbox.Attribute) {
+	for x := 0; x < WIDTH; x++ {
+		for y := 0; y < HEIGHT; y++ {
+			termbox.SetCell(x+2, y+2, ' ', termbox.ColorDefault, colors[m[x][y]])
+		}
+	}
+}