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  1. #include <graphics.h>
  2. #include <stdio.h>
  3. #include <conio.h>
  4. #include <math.h>
  5.  
  6. void tree(int x, int y, int height, float angle);
  7.  
  8. float branch_rotation = 30.0f;
  9. float branch_height_factor = 0.73;
  10.  
  11. void draw_loop()
  12. {
  13.     int x = getmaxx() / 2;
  14.     int y = getmaxy();
  15.     int height = y - 32;
  16.     float angle = -90;
  17.  
  18.     setcolor(15);
  19.  
  20.     while (1)
  21.     {
  22.         clrscr();
  23.  
  24.         char message[128];
  25.         sprintf(message, "height: %d; rotation: %f (z/x); branch offset %f (a/s)",
  26.             height, branch_rotation, branch_height_factor);
  27.         outtextxy(10, 10, message);
  28.  
  29.         setcolor(11);
  30.         tree(x, y, height, angle);
  31.  
  32.         switch (getch())
  33.         {
  34.             case 'z':
  35.                 branch_rotation -= 1.0f;
  36.                 break;
  37.  
  38.             case 'x':
  39.                 branch_rotation += 1.0f;
  40.                 break;
  41.  
  42.             case 'a':
  43.                 branch_height_factor -= 0.01f;
  44.                 break;
  45.  
  46.             case 's':
  47.                 branch_height_factor += 0.01f;
  48.                 break;
  49.  
  50.             case ' ':
  51.             case 'q':
  52.             case 27: // Escape.
  53.                 return;
  54.  
  55.             default:
  56.                 break;
  57.         }
  58.     }
  59. }
  60.  
  61. int main()
  62. {
  63.     int gddriver = DETECT, gmode, errorcode;
  64.     initgraph(&gddriver, &gmode, "");
  65.     draw_loop();
  66.     closegraph();
  67.     return 0;
  68. }
  69.  
  70.  
  71.  
  72. void tree(int x, int y, int height, float angle)
  73. {
  74.     // Convert angle to radians.
  75.     float angle_rad = angle * (M_PI / 180.0);
  76.  
  77.     // Calculate a direction vector.
  78.     float xf = cos(angle_rad);
  79.     float yf = sin(angle_rad);
  80.  
  81.     // Draw subtrees.
  82.     int branch_height = (int) (height * branch_height_factor);
  83.     int branch_start_x = x + (int) (xf * (height - branch_height));
  84.     int branch_start_y = y + (int) (yf * (height - branch_height));
  85.  
  86.     // Stop recursion for extreme cases.
  87.     if (branch_height < 1 || branch_height >= height)
  88.     {
  89.         return;
  90.     }
  91.  
  92.     // Draw the center of the (sub)tree.
  93.     line(x, y, x + (int) (xf * height ), y + (int) (yf * height));
  94.  
  95.     tree(branch_start_x, branch_start_y, branch_height, angle - branch_rotation);
  96.     tree(branch_start_x, branch_start_y, branch_height, angle + branch_rotation);
  97. }
  98.  
  99.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
compilation info 
prog.cpp:1:22: fatal error: graphics.h: No such file or directory
compilation terminated.
stdout 
Standard output is empty
https://ideone.com/AHun0n
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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