From a9b8108924385328210edb57d1042614d729d3e1 Mon Sep 17 00:00:00 2001
From: Steven Polley <himself@stevenpolley.net>
Date: Mon, 30 Jul 2018 22:41:39 -0600
Subject: [PATCH] Move color step and xpos, ypos to variables scoped in main

---
 main.go | 51 ++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 36 insertions(+), 15 deletions(-)

diff --git a/main.go b/main.go
index 2c0c371..9d9abc1 100644
--- a/main.go
+++ b/main.go
@@ -16,16 +16,14 @@ import (
 
 var (
 	colorPalette string
-	colorStep    float64
-	xpos, ypos   float64
 )
 
 var waitGroup sync.WaitGroup
 
 func init() {
-	flag.Float64Var(&colorStep, "step", 12000, "Color smooth step. Value should be greater than iteration count, otherwise the value will be adjusted to the iteration count.")
-	flag.Float64Var(&xpos, "xpos", -0.00275, "Point position on the real axis (defined on `x` axis)")
-	flag.Float64Var(&ypos, "ypos", 0.78912, "Point position on the imaginary axis (defined on `y` axis)")
+	//flag.Float64Var(&xpos, "xpos", -0.00275, "Point position on the real axis (defined on `x` axis)")
+	//flag.Float64Var(&ypos, "ypos", 0.78912, "Point position on the imaginary axis (defined on `y` axis)")
+
 	flag.StringVar(&colorPalette, "palette", "Plan9", "Hippi | Plan9 | AfternoonBlue | SummerBeach | Biochimist | Fiesta")
 	flag.Parse()
 }
@@ -33,11 +31,17 @@ func init() {
 func main() {
 
 	//var escapeRadius float64 = 0.125689
-	var escapeRadius float64 = -0.01
-	maxIteration := 800
+	//var escapeRadius float64 = 0
+	var escapeRadius float64 = 4
+	var colorStep float64 = 12000
+	//var xpos float64 = -0.01925
+	//var ypos float64 = 0.796272
+	var xpos float64 = -1.0
+	var ypos float64 = -1.0
+	maxIteration := 2000
 	imageSmoothness := 1
-	width := 1920
-	height := 1080
+	width := 640
+	height := 480
 
 	if colorStep < float64(maxIteration) {
 		colorStep = float64(maxIteration)
@@ -47,10 +51,27 @@ func main() {
 	if len(colors) > 0 {
 		fmt.Println("Rendering images...")
 
-		for i := 1; i <= 15000; i++ {
-			render(maxIteration, colors, escapeRadius, imageSmoothness, width, height, fmt.Sprintf("images/%08d.png", i))
-			escapeRadius += 0.001
-			maxIteration += 1
+		for i := 1; i <= 2000; i++ {
+			render(maxIteration, colors, escapeRadius, xpos, ypos, imageSmoothness, width, height, fmt.Sprintf("images/%08d.png", i))
+
+			//ypos += 0.00020
+			//xpos -= 0.00010
+
+			//	if i%3 == 0 {
+			maxIteration++
+			//	}
+
+			if i > 100 {
+				escapeRadius *= 0.995
+
+			}
+
+			if xpos > -1.4 {
+				if i > 100 {
+					//	xpos *= 1.005
+				}
+			}
+			fmt.Println(xpos)
 		}
 
 	}
@@ -117,8 +138,8 @@ func interpolateColors(paletteCode *string, numberOfColors float64) []color.RGBA
 	return interpolatedColors
 }
 
-func render(maxIteration int, colors []color.RGBA, escapeRadius float64, imageSmoothness, width, height int, outputFile string) {
-	fmt.Printf("rendering image %s\n", outputFile)
+func render(maxIteration int, colors []color.RGBA, escapeRadius, xpos, ypos float64, imageSmoothness, width, height int, outputFile string) {
+	fmt.Printf("Mandelbrot set escapeRadius=%f image=%s\n", escapeRadius, outputFile)
 
 	width = width * imageSmoothness
 	height = height * imageSmoothness