better logging

conway.go

@@ -1,7 +1,9 @@
 package main
 
 import (
-	"github.com/go-resty/resty/v2"
+	"errors"
+	"math/rand"
+	"time"
 )
 
 type Cell struct {
@@ -10,20 +12,101 @@ type Cell struct {
 	live bool
 }
 
-func (c *Cell) NeighborCount() int {
+func (c *Cell) NeighborCount(arr [][]Cell) int {
+	// Read grid dimensions
+	width := len(arr)
+	height := len(arr[0])
 
+	count := 0
+	// Iterate through 3x3 neighboring grid
+	for i := -1; i <= 1; i++ {
+		for j := -1; j <= 1; j++ {
+			// Ignore own position
+			if i == 0 && j == 0 {
+				continue
+			}
+			// Get neighbor coordinates
+			nx := (c.x + i + width) % width
+			ny := (c.y + j + height) % height
+			// Count if neighbor is alive
+			if arr[nx][ny].live {
+				count++
+			}
+		}
+	}
+	return count
 }
 
-func coordinatesToIndex(x int, y int) int {
-	return x + y*width
+func initGrid(width, height int, parent ...[][]Cell) ([][]Cell, error) {
+	exists := len(parent) == 1
+	if exists && len(parent) > 1 {
+		return nil, errors.New("Too many parents specified")
+	}
+
+	// Make first dimension
+	cells := make([][]Cell, width)
+	for i := 0; i < width; i++ {
+		// Make second dimension
+		cells[i] = make([]Cell, height)
+		for j := 0; j < height; j++ {
+			// Make cells
+			cells[i][j].x = i
+			cells[i][j].y = j
+			// If specified, copy state from parent
+			if exists {
+				cells[i][j].live = parent[0][i][j].live
+			} else {
+				cells[i][j].live = rand.Intn(2) == 1
+			}
+		}
+	}
+	return cells, nil
 }
 
-var grid []Cell
+func setup(callback func([][]Cell), width, height int, FPS time.Duration) chan bool {
+	// Initialize grid
+	grid, _ := initGrid(width, height)
 
-func setup(client *resty.Client, url, width int, height int) {
+	// Prepare ticker and finishing flag
+	ticker := time.NewTicker((1000 / FPS) * time.Millisecond)
+	done := make(chan bool)
 
+	// Run game loop
+	go func() {
+		for {
+			select {
+			case <-done:
+				return
+			case <-ticker.C:
+				grid = draw(grid, callback)
+			}
+		}
+	}()
+
+	// Return flag to be stopped outside
+	return done
 }
 
-func draw() {
-
+func draw(grid [][]Cell, callback func([][]Cell)) [][]Cell {
+	generation, _ := initGrid(len(grid), len(grid[0]), grid)
+	// Iterate through grid
+	for i := 0; i < len(grid); i++ {
+		for j := 0; j < len(grid[0]); j++ {
+			// Count neighbors
+			cout := grid[i][j].NeighborCount(grid)
+			// Get state
+			curr := grid[i][j].live
+			// Apply rules
+			died := curr && (cout < 2 || cout > 3)
+			born := !curr && cout == 3
+			next := curr && !died || born
+			// Set state
+			generation[i][j].live = next
+			//   A * !(A * (B + C)) + !A * D
+			// = A * !B * !C + !A * D
+			// curr && cout >= 2 && cout <= 3 || !curr && cout == 3
+		}
+	}
+	callback(generation)
+	return generation
 }

go.mod

@@ -3,7 +3,12 @@ module example.com/MatrixGameOfLife
 go 1.22.1
 
 require (
-	github.com/go-resty/resty/v2 v2.12.0 // indirect
-	github.com/joho/godotenv v1.5.1 // indirect
-	golang.org/x/net v0.24.0 // indirect
+	github.com/go-resty/resty/v2 v2.12.0
+	github.com/joho/godotenv v1.5.1
+	github.com/buger/goterm v1.0.4
+)
+
+require (
+	golang.org/x/net v0.24.0 // indirect
+	golang.org/x/sys v0.19.0 // indirect
 )

go.sum

@@ -1,3 +1,5 @@
+github.com/buger/goterm v1.0.4 h1:Z9YvGmOih81P0FbVtEYTFF6YsSgxSUKEhf/f9bTMXbY=
+github.com/buger/goterm v1.0.4/go.mod h1:HiFWV3xnkolgrBV3mY8m0X0Pumt4zg4QhbdOzQtB8tE=
 github.com/go-resty/resty/v2 v2.12.0 h1:rsVL8P90LFvkUYq/V5BTVe203WfRIU4gvcf+yfzJzGA=
 github.com/go-resty/resty/v2 v2.12.0/go.mod h1:o0yGPrkS3lOe1+eFajk6kBW8ScXzwU3hD69/gt2yB/0=
 github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
@@ -23,6 +25,7 @@ golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.1.0/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210331175145-43e1dd70ce54/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
@@ -30,6 +33,8 @@ golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/sys v0.18.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.19.0 h1:q5f1RH2jigJ1MoAWp2KTp3gm5zAGFUTarQZ5U386+4o=
+golang.org/x/sys v0.19.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/term v0.5.0/go.mod h1:jMB1sMXY+tzblOD4FWmEbocvup2/aLOaQEp7JmGp78k=
@@ -42,6 +47,7 @@ golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/text v0.7.0/go.mod h1:mrYo+phRRbMaCq/xk9113O4dZlRixOauAjOtrjsXDZ8=
 golang.org/x/text v0.9.0/go.mod h1:e1OnstbJyHTd6l/uOt8jFFHp6TRDWZR/bV3emEE/zU8=
 golang.org/x/text v0.14.0/go.mod h1:18ZOQIKpY8NJVqYksKHtTdi31H5itFRjB5/qKTNYzSU=
+golang.org/x/time v0.5.0 h1:o7cqy6amK/52YcAKIPlM3a+Fpj35zvRj2TP+e1xFSfk=
 golang.org/x/time v0.5.0/go.mod h1:3BpzKBy/shNhVucY/MWOyx10tF3SFh9QdLuxbVysPQM=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=

main.go

@@ -1,13 +1,42 @@
 package main
 
 import (
+	"fmt"
 	"log"
 
+	"github.com/buger/goterm"
 	"github.com/go-resty/resty/v2"
 	"github.com/joho/godotenv"
 )
 
+func output(client *resty.Client, url string, width, height int, arr [][]Cell) {
+	goterm.MoveCursor(1, 2)
+	// Prepare instructions for matrix
+	instructions := make([]interface{}, 0)
+	// Append all live cells as pixel instructions
+	for j := 0; j < height; j++ {
+		for i := 0; i < width; i++ {
+			if arr[i][j].live {
+				instructions = append(instructions, Pixel{X: i, Y: j, Endpoint: PIXEL})
+				goterm.Print("X")
+				continue
+			}
+			goterm.Print(" ")
+		}
+		goterm.Println()
+	}
+	// Append update instruction
+	instructions = append(instructions, Update{Endpoint: UPDATE})
+	// Send to matrix
+	sendRequest(client, url, instructions)
+
+	// Update terminal UI
+	goterm.Flush()
+}
+
 func main() {
+	const FPS = 10
+
 	// Load .env file if it exists
 	err := godotenv.Load(".env")
 	if err != nil {
@@ -16,23 +45,20 @@ func main() {
 
 	// Load env server data
 	url, width, height := loadMatrixData()
-	log.Printf("At '%s': %d x %d\n", url, width, height)
+	goterm.Printf("On '%s' at [%d x %d] with %d FPS\n", url, width, height, FPS)
 
 	// Initialize resty client
 	client := resty.New()
+	// Initialize pixel color
+	sendRequest(client, url, []interface{}{Color{R: 255, G: 255, B: 255, Endpoint: COLOR}})
 
-	// Initialize custom matrix data
-	col := Color{R: 255, G: 0, B: 255, Endpoint: COLOR}
-	rct := Rectangle{X: 0, Y: 0, W: 10, H: 10, Endpoint: RECTANGLE}
+	// Run Game of Life
+	done := setup(func(c [][]Cell) {
+		output(client, url, width, height, c)
+	}, width, height, FPS)
 
-	// Send request to remote server
-	sendRequest(client, url, []interface{}{col, rct})
-
-	// Initialize custom matrix data
-	col = Color{R: 255, G: 255, B: 0, Endpoint: COLOR}
-	rct = Rectangle{X: 15, Y: 15, W: 15, H: 15, Endpoint: RECTANGLE}
-	upd := Update{Endpoint: UPDATE}
-
-	// Send request to remote server
-	sendRequest(client, url, []interface{}{col, rct, upd})
+	// Wait for user input to quit
+	fmt.Scanln()
+	// Stop Game of Life, wait for routine
+	done <- true
 }

types.go

@@ -9,24 +9,31 @@ type Endpoint string
 const (
 	RECTANGLE Endpoint = "rectangle"
 	UPDATE    Endpoint = "update"
+	PIXEL     Endpoint = "pixel"
 	COLOR     Endpoint = "color"
 )
 
+type Rectangle struct {
+	X        int      `json:"x"`
+	Y        int      `json:"y"`
+	W        uint     `json:"w"`
+	H        uint     `json:"h"`
+	Endpoint Endpoint `json:"endpoint"`
+}
+
 type Update struct {
 	Endpoint Endpoint `json:"endpoint"`
 }
 
+type Pixel struct {
+	X        int      `json:"x"`
+	Y        int      `json:"y"`
+	Endpoint Endpoint `json:"endpoint"`
+}
+
 type Color struct {
 	R        uint8    `json:"r"`
 	G        uint8    `json:"g"`
 	B        uint8    `json:"b"`
 	Endpoint Endpoint `json:"endpoint"`
 }
-
-type Rectangle struct {
-	X        int      `json:"x"`
-	Y        int      `json:"y"`
-	W        uint     `json:"w"`
-	H        uint     `json:"h"`
-	Endpoint Endpoint `json:"endpoint"`
-}