steven/mandelmapper
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Added colors to web

Browse Source
This commit is contained in:
Steven Polley 2018-07-31 16:21:41 -06:00
parent a9b8108924
commit 82312a9d24
2 changed files with 85 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

87
web/render.go
View File

@ -1,16 +1,20 @@
package main
import (
"fmt"
"image"
"image/color"
"image/png"
"log"
"math"
"math/cmplx"
"net/http"
"runtime"
"strconv"
"strings"
"sync"
"deadbeef.codes/steven/mandelbrot/palette"
)
const (
@ -19,6 +23,10 @@ const (
Brighten = 1024
)
var (
colors []color.RGBA
)
func mandelbrot(c complex128) uint16 {
var z complex128
@ -33,7 +41,7 @@ func mandelbrot(c complex128) uint16 {
}
type pixel struct {
out *image.Gray16
out *image.RGBA
x, y int
tileX, tileY int64
tileZoom uint8
@ -50,8 +58,8 @@ func computeThread() {
(float64(p.y)/Size+float64(p.tileY))/float64(uint(1<<p.tileZoom)),
),
)
p.out.SetGray16(p.x, p.y, color.Gray16{val * Brighten})
p.out.SetRGBA(p.x, p.y, colors[val])
p.wg.Done()
}
}
@ -63,6 +71,10 @@ func main() {
go computeThread()
}
colorStep := float64(256)
colors = interpolateColors("Plan9", colorStep)
fmt.Println(len(colors))
log.Fatal(http.ListenAndServe(":6161", nil))
}
@ -95,7 +107,7 @@ func renderTile(w http.ResponseWriter, r *http.Request) {
wg.Add(Size * Size)
img := image.NewGray16(image.Rect(0, 0, Size, Size))
img := image.NewRGBA(image.Rect(0, 0, Size, Size))
for x := 0; x < Size; x++ {
for y := 0; y < Size; y++ {
@ -112,3 +124,72 @@ func renderTile(w http.ResponseWriter, r *http.Request) {
func init() {
http.HandleFunc("/mandelbrot/", renderTile)
}
func interpolateColors(paletteCode string, numberOfColors float64) []color.RGBA {
var factor float64
steps := []float64{}
cols := []uint32{}
interpolated := []uint32{}
interpolatedColors := []color.RGBA{}
for _, v := range palette.ColorPalettes {
factor = 1.0 / numberOfColors
switch v.Keyword {
case paletteCode:
if paletteCode != "" {
for index, col := range v.Colors {
if col.Step == 0.0 && index != 0 {
stepRatio := float64(index+1) / float64(len(v.Colors))
step := float64(int(stepRatio*100)) / 100 // truncate to 2 decimal precision
steps = append(steps, step)
} else {
steps = append(steps, col.Step)
}
r, g, b, a := col.Color.RGBA()
r /= 0xff
g /= 0xff
b /= 0xff
a /= 0xff
uintColor := uint32(r)<<24 | uint32(g)<<16 | uint32(b)<<8 | uint32(a)
cols = append(cols, uintColor)
}
var min, max, minColor, maxColor float64
if len(v.Colors) == len(steps) && len(v.Colors) == len(cols) {
for i := 0.0; i <= 1; i += factor {
for j := 0; j < len(v.Colors)-1; j++ {
if i >= steps[j] && i < steps[j+1] {
min = steps[j]
max = steps[j+1]
minColor = float64(cols[j])
maxColor = float64(cols[j+1])
uintColor := cosineInterpolation(maxColor, minColor, (i-min)/(max-min))
interpolated = append(interpolated, uint32(uintColor))
}
}
}
}
for _, pixelValue := range interpolated {
r := pixelValue >> 24 & 0xff
g := pixelValue >> 16 & 0xff
b := pixelValue >> 8 & 0xff
a := 0xff
interpolatedColors = append(interpolatedColors, color.RGBA{uint8(r), uint8(g), uint8(b), uint8(a)})
}
}
}
}
return interpolatedColors
}
func cosineInterpolation(c1, c2, mu float64) float64 {
mu2 := (1 - math.Cos(mu*math.Pi)) / 2.0
return c1*(1-mu2) + c2*mu2
}
func linearInterpolation(c1, c2, mu uint32) uint32 {
return c1*(1-mu) + c2*mu
}

2
web/web.go
View File

@ -16,7 +16,7 @@ func init() {
fmt.Fprintf(w, `<!DOCTYPE html>
<html>
<head>
<title>Mandelbrot Map</title>
<title>MandelMapper</title>
<script src="https://maps.googleapis.com/maps/api/js?sensor=false"></script>
<script>
var mandelbrotTypeOptions = {