From 1fe2ad42f8bfc44ea5507023e162f79304d82023 Mon Sep 17 00:00:00 2001
From: Rose Hogenson <rosehogenson@posteo.net>
Date: Tue, 29 Aug 2023 07:48:25 -0700
Subject: Simplify the code.

I removed the dependency on term by just always printing a small image.
It's more of a proof-of-concept.
---
 mandelbrot.go | 66 +++++++++++++++--------------------------------------------
 1 file changed, 17 insertions(+), 49 deletions(-)

diff --git a/mandelbrot.go b/mandelbrot.go
index 27d7bdb..5876383 100644
--- a/mandelbrot.go
+++ b/mandelbrot.go
@@ -2,73 +2,37 @@ package main
 
 import (
 	"fmt"
-	"golang.org/x/term"
-	"log"
 	"math/big"
 	"time"
 )
 
-type color int
+var rat4 = big.NewRat(4, 1)
 
-const (
-	black color = iota
-	red
-	yellow
-	green
-	cyan
-	blue
-	magenta
-)
-
-func (c color) print() {
-	var i int
-	switch c {
-	case red:
-		i = 41
-	case yellow:
-		i = 43
-	case green:
-		i = 42
-	case cyan:
-		i = 46
-	case blue:
-		i = 44
-	case magenta:
-		i = 45
-	default:
-		i = 40
-	}
-	if _, err := fmt.Printf("\033[%dm ", i); err != nil {
-		log.Fatal(err)
-	}
-}
-
-var rat2 = big.NewRat(2, 1)
-
-func mandelbrot(x0, y0 *big.Rat) color {
+func mandelbrot(x0, y0 *big.Rat) int {
 	x := new(big.Rat)
 	y := new(big.Rat)
 	x2 := new(big.Rat)
 	y2 := new(big.Rat)
+	temp := new(big.Rat)
 	i := 0
-	for ; x2.Cmp(rat2) <= 0 && y2.Cmp(rat2) <= 0; i++ {
+	for ; temp.Add(x2, y2).Cmp(rat4) <= 0; i++ {
 		y.Add(y, y).Mul(y, x).Add(y, y0)
 		x.Sub(x2, y2).Add(x, x0)
 		x2.Mul(x, x)
 		y2.Mul(y, y)
 	}
-	return color(i-1)%magenta + 1
+	return (i-1)%6 + 1
 }
 
-func printMandelbrot(xMin, xRange, yMin, yRange *big.Rat) {
-	width, height, err := term.GetSize(0)
-	if err != nil {
-		log.Fatalf("Terminal size: %s.", err)
-	}
+func printMandelbrot(xMin, xRange, yMin, yRange *big.Rat) error {
+	const (
+		width  = 80
+		height = 25
+	)
 
+	grid := make([]int, width*height)
 	xStep := new(big.Rat).Quo(xRange, big.NewRat(int64(width), 1))
 	yStep := new(big.Rat).Quo(yRange, big.NewRat(int64(height), 1))
-	grid := make([]color, width*height)
 	y := new(big.Rat)
 	x := new(big.Rat)
 	y.Set(yMin)
@@ -83,9 +47,13 @@ func printMandelbrot(xMin, xRange, yMin, yRange *big.Rat) {
 		y.Add(y, yStep)
 	}
 	time.Sleep(time.Minute)
-	for _, c := range grid {
-		c.print()
+	for i := 0; i < height; i++ {
+		for j := 0; j < width; j++ {
+			fmt.Printf("\033[%dm ", 40+grid[i*width+j])
+		}
+		fmt.Println("\033[49m")
 	}
+	return nil
 }
 
 func main() {
-- 
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