main.go: symmetry color conversion, all float32 -> float64

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"math"
 	"math/bits"
 	"os"
 	"strings"
@@ -40,9 +41,9 @@ func (g *LCG) random() uint32 {
 	return uint32(g.seed)
 }
 
-func (g *LCG) binomial(p float32) bool {
+func (g *LCG) binomial(p float64) bool {
 	/* Sample from Binomial distribution with probability p */
-	var sample = float32(g.random()) * float32(1.0/4294967295.0)
+	var sample = float64(g.random()) * float64(1.0/4294967295.0)
 	return sample > p
 }
 
@@ -52,13 +53,13 @@ func (g *LCG) pickOne(s []string) string {
 	return s[g.random()%N]
 }
 
-func (g *LCG) pickOneFloat(s []float32) float32 {
+func (g *LCG) pickOneFloat(s []float64) float64 {
 	/* Pick one element from list - float version*/
 	var N = uint32(len(s))
 	return s[g.random()%N]
 }
 
-func (g *LCG) pickAorB(p float32, a string, b string) string {
+func (g *LCG) pickAorB(p float64, a string, b string) string {
 	/* Pick a or b with probability p of picking a */
 	if g.binomial(p) {
 		return a
@@ -79,12 +80,12 @@ type RGB struct {
 }
 
 type HSV struct {
-	h float32
-	s float32
-	v float32
+	h float64
+	s float64
+	v float64
 }
 
-func f2rgb(r, g, b float32) *RGB {
+func f2rgb(r, g, b float64) *RGB {
 	// make RGB from 3 floats
 	c := new(RGB)
 	c.r = uint8(r * 1.0 / 255)
@@ -93,6 +94,15 @@ func f2rgb(r, g, b float32) *RGB {
 	return c
 }
 
+func f2hsv(h, s, v float64) *HSV {
+	// make HSV from 3 floats
+	c := new(HSV)
+	c.h = h
+	c.s = s
+	c.v = v
+	return c
+}
+
 func rgb(s string) *RGB {
 	c := new(RGB)
 	fmt.Sscanf(s, "#%02x%02x%02x", c.r, c.g, c.b)
@@ -100,11 +110,41 @@ func rgb(s string) *RGB {
 }
 
 func (c *RGB) to_hsv() *HSV {
+	var h float64
+	var s float64
+	var v float64
+	r := 255.0 * float64(c.r)
+	g := 255.0 * float64(c.g)
+	b := 255.0 * float64(c.b)
+	min := math.Min(math.Min(r, g), b)
+	v = math.Max(math.Max(r, g), b)
+	C := v - min
+	s = 0.0
+	if v != 0.0 {
+		s = C / v
+	}
+	h = 0.0
+	if min != v {
+		if v == r {
+			h = math.Mod((g - b) / C, 6.0)
+		}
+		if v == g {
+			h = (b - r) / C + 2.0
+		}
+		if v == b {
+			h = (r - g) / C + 4.0
+		}
+		h *= 60.0
+		if h < 0.0 {
+			h += 360.0
+		}
+	}
+	return f2hsv(h, s, v) 
 }
 
 func (c *HSV) to_rgb() *RGB {
 	h := int((c.h / 60))
-	f := c.h/60 - float32(h)
+	f := c.h/60 - float64(h)
 	p := c.v * (1 - c.s)
 	q := c.v * (1 - c.s*f)
 	t := c.v * (1 - c.s*(1-f))
@@ -155,7 +195,7 @@ func (c *RGB) darkerThan(ref RGB, delta uint8) string {
 	return fmt.Sprintf("#%02x%02x%02x", sub255(c.r, delta), sub255(c.g, delta), sub255(c.b, delta))
 }
 
-func (c RGB) withAlpha(alpha float32) string {
+func (c RGB) withAlpha(alpha float64) string {
 	return fmt.Sprintf("#%02x%02x%02x", c.r, c.g, c.b, uint8(255*alpha))
 }
 
@@ -166,7 +206,7 @@ func maleAvatar(seed uint64) string {
 		"#91553d", "#533d32", "#3b3024", "#554838", "#4e433f", "#504444", "#6a4e42", "#a7856a", "#977961"})).brighterOrDarkerThan(*rgb(skinColor), 17)
 	var eyesColor = g.pickOne([]string{"#76778b", "#697b94", "#647b90", "#5b7c8b", "#588387"})
 	var eyebrowsColor = rgb(rgb(hairColor).darkerThan(*rgb(skinColor), 7)).darkerThan(*rgb(hairColor), 10)
-	var mustacheColor = rgb(rgb(hairColor).darkerThan(*rgb(skinColor), 7)).withAlpha(g.pickOneFloat([]float32{1, 0.75, 0.5}))
+	var mustacheColor = rgb(rgb(hairColor).darkerThan(*rgb(skinColor), 7)).withAlpha(g.pickOneFloat([]float64{1, 0.75, 0.5}))
 	var mouthColor = rgb(g.pickOne([]string{"#eec1ad", "#dbac98", "#d29985"})).brighterOrDarkerThan(*rgb(skinColor), 10)
 	var glassesColor = g.pickOne([]string{"#5f705c", "#43677d", "#5e172d", "#ffb67a", "#a04b5d", "#191919", "#323232", "#4b4b4b"})
 	var clothesColor = g.pickOne([]string{"#5bc0de", "#5cb85c", "#428bca", "#03396c", "#005b96", "#6497b1", "#1b85b8", "#5a5255", "#559e83", "#ae5a41", "#c3cb71", "#666547", "#ffe28a"})