From 23fc55a003793f7309058162294c7f7fd2a6e216 Mon Sep 17 00:00:00 2001
From: Jake Hillion <jake@hillion.co.uk>
Date: Sun, 3 May 2020 23:44:38 +0100
Subject: [PATCH] Added go stuff

---
 go/Dockerfile                 |   8 +
 go/go.mod                     |   3 +
 go/go.sum                     |   0
 go/main.go                    |  71 ++++++++
 go/patterns/character.go      | 303 ++++++++++++++++++++++++++++++++++
 go/patterns/patterns.go       |   3 +
 go/patterns/scrolling_text.go |  59 +++++++
 go/patterns/solid_colour.go   |  16 ++
 go/patterns/super_rgb.go      |  25 +++
 9 files changed, 488 insertions(+)
 create mode 100644 go/Dockerfile
 create mode 100644 go/go.mod
 create mode 100644 go/go.sum
 create mode 100644 go/main.go
 create mode 100644 go/patterns/character.go
 create mode 100644 go/patterns/patterns.go
 create mode 100644 go/patterns/scrolling_text.go
 create mode 100644 go/patterns/solid_colour.go
 create mode 100644 go/patterns/super_rgb.go

diff --git a/go/Dockerfile b/go/Dockerfile
new file mode 100644
index 0000000..9ece61b
--- /dev/null
+++ b/go/Dockerfile
@@ -0,0 +1,8 @@
+FROM golang:1.14-alpine
+
+WORKDIR /go/src/app
+COPY . .
+
+RUN go install
+
+CMD ["dancefloor"]
diff --git a/go/go.mod b/go/go.mod
new file mode 100644
index 0000000..a0db936
--- /dev/null
+++ b/go/go.mod
@@ -0,0 +1,3 @@
+module dancefloor
+
+go 1.14
diff --git a/go/go.sum b/go/go.sum
new file mode 100644
index 0000000..e69de29
diff --git a/go/main.go b/go/main.go
new file mode 100644
index 0000000..5e17332
--- /dev/null
+++ b/go/main.go
@@ -0,0 +1,71 @@
+package main
+
+import (
+	"bytes"
+	"dancefloor/patterns"
+	"encoding/json"
+	"net/http"
+	"sync"
+)
+
+var client http.Client
+var lock sync.Mutex
+var pattern Pattern
+
+var width, height int
+
+func main() {
+	width = 6
+	height = 5
+
+	go drawLoop()
+
+	SetPattern(&patterns.ScrollingText{Text: "Jake is the best!", Colour: [3]uint8{0, 0, 255}, Background: [3]uint8{24, 24, 24}})
+
+	select {}
+}
+
+type Pattern interface {
+	Draw(width, height int) *[][]patterns.Colour
+}
+
+func SetPattern(new Pattern) {
+	lock.Lock()
+	defer lock.Unlock()
+	pattern = new
+}
+
+func draw() *[][]patterns.Colour {
+	lock.Lock()
+	defer lock.Unlock()
+	return pattern.Draw(width, height)
+}
+
+func render(data *[][]patterns.Colour) {
+	content, err := json.Marshal(struct {
+		Data [][]patterns.Colour `json:"data"`
+	}{
+		Data: *data,
+	})
+
+	if err != nil {
+		panic(err)
+	}
+
+	req, err := http.NewRequest("PUT", "http://10.10.0.26:5000/update", bytes.NewReader(content))
+	if err != nil {
+		panic(err)
+	}
+	req.Header.Add("Content-Type", "application/json")
+
+	_, err = client.Do(req)
+	if err != nil {
+		panic(err)
+	}
+}
+
+func drawLoop() {
+	for {
+		render(draw())
+	}
+}
diff --git a/go/patterns/character.go b/go/patterns/character.go
new file mode 100644
index 0000000..034310c
--- /dev/null
+++ b/go/patterns/character.go
@@ -0,0 +1,303 @@
+package patterns
+
+// character maps referenced [y][x]
+var masks = make(map[rune]*[5][]bool)
+
+type Character struct {
+	Character  rune
+	Colour     Colour
+	Background Colour
+
+	initiated bool
+	drawn     [][]Colour
+}
+
+func (s *Character) Draw(width, height int) *[][]Colour {
+	if !s.initiated {
+		s.init(width, height)
+		s.initiated = true
+	}
+	return &s.drawn
+}
+
+func (s *Character) init(width, height int) {
+	if width == 0 {
+		if _, ok := masks[s.Character]; ok {
+			width = len(masks[s.Character][0])
+		}
+	}
+
+	s.drawn = make([][]Colour, width)
+	for i := 0; i < width; i++ {
+		s.drawn[i] = make([]Colour, height)
+		for j := 0; j < height; j++ {
+			s.drawn[i][j] = s.Background
+			if val, ok := masks[s.Character]; ok {
+				y := 5 - j - 1
+				if i < len(val[y]) && val[y][i] {
+					s.drawn[i][j] = s.Colour
+				}
+			}
+		}
+	}
+}
+
+func init() {
+	masks['a'] = &[5][]bool{
+		{true, true, true, true, true},
+		{true, false, false, false, true},
+		{true, true, true, true, true},
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+	}
+	masks['A'] = masks['a']
+
+	masks['b'] = &[5][]bool{
+		{true, true, true, true, false},
+		{true, false, false, false, true},
+		{true, true, true, true, true},
+		{true, false, false, false, true},
+		{true, true, true, true, false},
+	}
+	masks['B'] = masks['b']
+
+	masks['c'] = &[5][]bool{
+		{true, true, true, true, true},
+		{true, false, false, false, false},
+		{true, false, false, false, false},
+		{true, false, false, false, false},
+		{true, true, true, true, true},
+	}
+	masks['C'] = masks['c']
+
+	masks['d'] = &[5][]bool{
+		{true, true, true, true, false},
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+		{true, true, true, true, false},
+	}
+	masks['D'] = masks['d']
+
+	masks['e'] = &[5][]bool{
+		{true, true, true, true, true},
+		{true, false, false, false, false},
+		{true, true, true, true, false},
+		{true, false, false, false, false},
+		{true, true, true, true, true},
+	}
+	masks['E'] = masks['e']
+
+	masks['f'] = &[5][]bool{
+		{true, true, true, true, true},
+		{true, false, false, false, false},
+		{true, true, true, true, false},
+		{true, false, false, false, false},
+		{true, false, false, false, false},
+	}
+	masks['F'] = masks['f']
+
+	masks['g'] = &[5][]bool{
+		{true, true, true, true, true},
+		{true, false, false, false, false},
+		{true, false, true, true, true},
+		{true, false, false, false, true},
+		{true, true, true, true, true},
+	}
+	masks['G'] = masks['g']
+
+	masks['h'] = &[5][]bool{
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+		{true, true, true, true, true},
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+	}
+	masks['H'] = masks['h']
+
+	masks['i'] = &[5][]bool{
+		{true, true, true, true, true},
+		{false, false, true, false, false},
+		{false, false, true, false, false},
+		{false, false, true, false, false},
+		{true, true, true, true, true},
+	}
+	masks['I'] = masks['i']
+
+	masks['j'] = &[5][]bool{
+		{true, true, true, true},
+		{false, false, true, false},
+		{false, false, true, false},
+		{true, false, true, false},
+		{true, true, true, false},
+	}
+	masks['J'] = masks['j']
+
+	masks['k'] = &[5][]bool{
+		{true, false, false, true},
+		{true, false, true, false},
+		{true, true, false, false},
+		{true, false, true, false},
+		{true, false, false, true},
+	}
+	masks['K'] = masks['k']
+
+	masks['l'] = &[5][]bool{
+		{true, false, false, false, false},
+		{true, false, false, false, false},
+		{true, false, false, false, false},
+		{true, false, false, false, false},
+		{true, true, true, true, true},
+	}
+	masks['L'] = masks['l']
+
+	masks['m'] = &[5][]bool{
+		{true, false, false, false, true},
+		{true, true, false, true, true},
+		{true, false, true, false, true},
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+	}
+	masks['M'] = masks['m']
+
+	masks['n'] = &[5][]bool{
+		{true, false, false, false, true},
+		{true, true, false, false, true},
+		{true, false, true, false, true},
+		{true, false, false, true, true},
+		{true, false, false, false, true},
+	}
+	masks['N'] = masks['n']
+
+	masks['o'] = &[5][]bool{
+		{true, true, true, true, true},
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+		{true, true, true, true, true},
+	}
+	masks['O'] = masks['o']
+
+	masks['p'] = &[5][]bool{
+		{true, true, true, true, true},
+		{true, false, false, false, true},
+		{true, true, true, true, true},
+		{true, false, false, false, false},
+		{true, false, false, false, false},
+	}
+	masks['P'] = masks['p']
+
+	masks['q'] = &[5][]bool{
+		{true, true, true, true, true},
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+		{true, false, false, true, true},
+		{true, true, true, true, true},
+	}
+	masks['Q'] = masks['q']
+
+	masks['r'] = &[5][]bool{
+		{true, true, true, true, true},
+		{true, false, false, false, true},
+		{true, true, true, true, true},
+		{true, false, false, true, false},
+		{true, false, false, false, true},
+	}
+	masks['R'] = masks['r']
+
+	masks['s'] = &[5][]bool{
+		{true, true, true, true, true},
+		{true, false, false, false, false},
+		{true, true, true, true, true},
+		{false, false, false, false, true},
+		{true, true, true, true, true},
+	}
+	masks['S'] = masks['s']
+
+	masks['t'] = &[5][]bool{
+		{true, true, true, true, true},
+		{false, false, true, false, false},
+		{false, false, true, false, false},
+		{false, false, true, false, false},
+		{false, false, true, false, false},
+	}
+	masks['T'] = masks['t']
+
+	masks['u'] = &[5][]bool{
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+		{true, true, true, true, true},
+	}
+	masks['U'] = masks['u']
+
+	masks['v'] = &[5][]bool{
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+		{false, true, false, true, false},
+		{false, true, false, true, false},
+		{false, false, true, false, false},
+	}
+	masks['V'] = masks['v']
+
+	masks['w'] = &[5][]bool{
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+		{true, false, false, false, true},
+		{true, false, true, false, true},
+		{true, true, false, true, true},
+	}
+	masks['W'] = masks['w']
+
+	masks['x'] = &[5][]bool{
+		{true, false, false, false, true},
+		{false, true, false, true, false},
+		{false, false, true, false, false},
+		{false, true, false, true, false},
+		{true, false, false, false, true},
+	}
+	masks['X'] = masks['x']
+
+	masks['y'] = &[5][]bool{
+		{true, false, false, false, true},
+		{false, true, false, true, false},
+		{false, false, true, false, false},
+		{false, false, true, false, false},
+		{false, false, true, false, false},
+	}
+	masks['Y'] = masks['y']
+
+	masks['z'] = &[5][]bool{
+		{true, true, true, true, true},
+		{false, false, false, true, false},
+		{false, false, true, false, false},
+		{false, true, false, false, false},
+		{true, true, true, true, true},
+	}
+	masks['Z'] = masks['z']
+
+	masks[' '] = &[5][]bool{
+		{false},
+		{false},
+		{false},
+		{false},
+		{false},
+	}
+
+	masks['.'] = &[5][]bool{
+		{false},
+		{false},
+		{false},
+		{false},
+		{true},
+	}
+
+	masks['!'] = &[5][]bool{
+		{true},
+		{true},
+		{true},
+		{false},
+		{true},
+	}
+}
diff --git a/go/patterns/patterns.go b/go/patterns/patterns.go
new file mode 100644
index 0000000..03ccef5
--- /dev/null
+++ b/go/patterns/patterns.go
@@ -0,0 +1,3 @@
+package patterns
+
+type Colour [3]uint8
diff --git a/go/patterns/scrolling_text.go b/go/patterns/scrolling_text.go
new file mode 100644
index 0000000..a482435
--- /dev/null
+++ b/go/patterns/scrolling_text.go
@@ -0,0 +1,59 @@
+package patterns
+
+type ScrollingText struct {
+	Text       string
+	Colour     Colour
+	Background Colour
+
+	initiated  bool
+	fullRender [][]Colour
+	step       int
+	substep    int
+}
+
+func (s *ScrollingText) Draw(width, height int) *[][]Colour {
+	if !s.initiated {
+		s.init(width, height)
+		s.initiated = true
+	}
+
+	out := s.fullRender[s.step : s.step+width]
+
+	s.substep++
+	s.substep %= 12
+	if s.substep == 0 {
+		s.step++
+		s.step %= len(s.fullRender) - width
+	}
+	return &out
+}
+
+func (s *ScrollingText) init(width, height int) {
+	// add extra cells so it flows in from the right
+	for i := 0; i < width-1; i++ {
+		s.fullRender = append(s.fullRender, s.blankCol(height))
+	}
+
+	var c rune
+	for _, c = range s.Text {
+		subpattern := Character{Character: c, Colour: s.Colour, Background: s.Background}
+		drawnSubpattern := subpattern.Draw(0, height)
+		for _, v := range *drawnSubpattern {
+			s.fullRender = append(s.fullRender, v)
+		}
+		s.fullRender = append(s.fullRender, s.blankCol(height))
+	}
+
+	// add extra cells to avoid overflow
+	for i := 0; i < width-1; i++ {
+		s.fullRender = append(s.fullRender, s.blankCol(height))
+	}
+}
+
+func (s *ScrollingText) blankCol(height int) (col []Colour) {
+	col = make([]Colour, height)
+	for j := 0; j < height; j++ {
+		col[j] = s.Background
+	}
+	return
+}
\ No newline at end of file
diff --git a/go/patterns/solid_colour.go b/go/patterns/solid_colour.go
new file mode 100644
index 0000000..3680acb
--- /dev/null
+++ b/go/patterns/solid_colour.go
@@ -0,0 +1,16 @@
+package patterns
+
+type SolidColour struct {
+	Colour
+}
+
+func (p *SolidColour) Draw(width, height int) *[][][3]uint8 {
+	out := make([][][3]uint8, width)
+	for i := 0; i < width; i++ {
+		out[i] = make([][3]uint8, height)
+		for j := 0; j < height; j++ {
+			out[i][j] = p.Colour
+		}
+	}
+	return &out
+}
\ No newline at end of file
diff --git a/go/patterns/super_rgb.go b/go/patterns/super_rgb.go
new file mode 100644
index 0000000..5e142ff
--- /dev/null
+++ b/go/patterns/super_rgb.go
@@ -0,0 +1,25 @@
+package patterns
+
+type SuperRgb struct {
+	Brightness uint8
+	iteration  int
+}
+
+func (p *SuperRgb) Draw(width, height int) *[][]Colour {
+	out := make([][]Colour, width)
+	for i := 0; i < width; i++ {
+		out[i] = make([]Colour, height)
+		for j := 0; j < height; j++ {
+			switch (i + j + p.iteration/12) % 4 {
+			case 0, 2:
+				out[i][j] = [3]uint8{p.Brightness, 0, 0}
+			case 1:
+				out[i][j] = [3]uint8{0, p.Brightness, 0}
+			case 3:
+				out[i][j] = [3]uint8{0, 0, p.Brightness}
+			}
+		}
+	}
+	p.iteration++
+	return &out
+}