java/mandelbrot/mandelbrot/mandelbrot.java

   1 /*
   2  * Mandelbrot set ASCII visualisation
   3  * http://en.wikipedia.org/wiki/Mandelbrot_set
   4  * http://www.root.cz/clanky/barvy-pro-shell/
   5  * Copylefted by: Harvie 2oo9
   6
   7
   8                                      aa
   9                                      aa
  10                                      aa
  11                                      aa
  12                                   aaaccaaa
  13                                  aaai  iaaa
  14                             aabaab        baabaa
  15                              aab            baa
  16                             aad              daa
  17                              aab            baa
  18                             aaaaad        daaaaa
  19                          aaacccl            lcccaaa
  20                      dbaaab                      baaabd
  21                     aab                              baa
  22                     aab                              baa
  23                 aaaaah                                haaaaa
  24           ba aaaak   c                                c   kaaaa ab
  25             aabc                                            cbaa
  26               aacabab                                babacaa
  27                     aae         ZEN OF CODING        eaa
  28                      aaa                            aaa
  29                       ae  n          cc          n  ea
  30                       aaa  ab aa afa    afa aa ba  aaa
  31
  32  */
  33
  34 package mandelbrot;
  35 import java.math.*;
  36
  37 public class mandelbrot {
  38         public String[] chars = " .`-_\':,;^=+/\\\"|)\\<>)iv%xclrs{*}I?!][1taeo7zjLunT#JCwfy325Fp6mqSghVd4EgXPGZbYkOA&8U$@KHDBWNMR0Q".split("");
  39         public int max_iteration = 140;
  40         public float zoom = 65;
  41
  42         public double x_from = -2;
  43         public double x_to = 2;
  44         public double y_from = -2.1;
  45         public double y_to = 2.1;
  46
  47         public boolean color = false;
  48         public boolean background = false;
  49
  50
  51         public mandelbrot() {
  52                 max_iteration = 140;
  53         zoom = 65;
  54
  55                 x_from = -2;
  56                 x_to = 2;
  57                 y_from = -2.1;
  58                 y_to = 2.1;
  59
  60                 color = false;
  61                 background = false;
  62         }
  63
  64         public int get_pixel_value(double x0, double y0) {
  65         double x = 0;
  66         double y = 0;
  67
  68         int iteration = 0;
  69
  70         while( x*x + y*y <= (2*2)  && iteration < max_iteration ) {
  71         double xtemp = x*x - y*y + x0;
  72         y = 2*x*y + y0;
  73         x = xtemp;
  74         iteration++;
  75         }
  76
  77         if( iteration >= max_iteration ) {
  78                         return 0;
  79                 }       else {
  80                         return iteration;
  81                 }
  82
  83         }
  84
  85         public String get_pixel_character(double x, double y) {
  86                 float i =  ((float)get_pixel_value(x, y)/(float)max_iteration) * (chars.length-1);
  87                 chars[0]=" ";
  88                 return chars[Math.round(i)];
  89         }
  90
  91         public String get_pixel_xterm_color(double x, double y) {
  92                 int i = Math.round( ((float)get_pixel_value(x, y)/max_iteration)*14 );
  93                 return "\033["+((int)(i%2))+";"+(30+(int)(i/2))+"m";
  94         }
  95
  96         public String get_pixel_xterm_background(double x, double y) {
  97                 int i = 40+Math.round( ((float)get_pixel_value(x, y)/max_iteration)*7 );
  98                 return "\033["+i+"m";
  99         }
 100
 101         public static void cls() {
 102                 System.out.print("\033[2J");
 103         }
 104
 105         public static void top() {
 106                 System.out.print("\033[0;0H");
 107         }
 108
 109         public void stat() {
 110                 System.out.print("ASCII Mandelbrot Set Visualisation (Harvie 2oo9) - Iterations: "+max_iteration+", zoom: "+zoom+"     \n");
 111         }
 112
 113         public void render() {
 114                 //if(color || background) max_iteration = 14;
 115
 116                 double x, y;
 117                 for(x=x_from; x<=x_to; x+=5/zoom) { for(y=y_from; y<=y_to; y+=2/zoom) {
 118                         if(color) System.out.print(get_pixel_xterm_color(x, y));
 119                         if(background) System.out.print(get_pixel_xterm_background(x, y));
 120
 121                         System.out.print(get_pixel_character(x, y));
 122                         //System.out.print(get_pixel_color(x, y)+" ");
 123                 } System.out.println("\033[0m"); }
 124         }
 125
 126 }