Redirected from Sierpinski triangle/Image credits
/* Copyright 2002 Damian Yerrick Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #include <allegro.h> const char init_siertri[6][6] = { {0, 0, 1, 1, 0, 0}, {0, 0, 2, 2, 0, 0}, {0, 1, 2, 2, 1, 0}, {0, 1, 0, 0, 1, 0}, {1, 2, 1, 1, 2, 1}, {2, 2, 2, 2, 2, 2} }; const PALETTE pal_3gray = { {63, 63, 63}, {32, 32, 32}, {0, 0, 0} }; const PALETTE pal_bw = { {63, 63, 63}, {0, 0, 0} }; int main(void) { int x, y; BITMAP *bmp; install_allegro(SYSTEM_NONE, &errno, atexit); set_color_depth(8); bmp = create_bitmap(768, 768); if(!bmp) { allegro_message("Could not create bitmap\n"); return 1; } /* set initial sierpinski triangle */ for(y = 0; y < 6; y++) for(x = 0; x < 6; x++) putpixel(bmp, x, y, init_siertri[y][x]); for(x = 0; x < 7; x++) { unsigned int scale = 3 << x; /* create bottom row */ blit(bmp, bmp, 0, 0, 0, 2*scale, 2*scale, 2*scale); blit(bmp, bmp, 0, 0, 2*scale, 2*scale, 2*scale, 2*scale); /* remove top row */ rectfill(bmp, 0, 0, 4*scale-1, 2*scale-1, 0); /* create new top row */ blit(bmp, bmp, 2*scale, 2*scale, scale, 0, 2*scale, 2*scale); } save_bitmap("sierpinski-triangle.pcx", bmp, pal_3gray); destroy_bitmap(bmp); bmp = create_bitmap(729, 729); if(!bmp) { allegro_message("Could not create bitmap\n"); return 1; } /* set initial sierpinski carpet */ rectfill(bmp, 0, 0, 2, 2, 1); putpixel(bmp, 1, 1, 0); for(x = 3; x < 729; x *= 3) { /* create top row */ blit(bmp, bmp, 0, 0, x, 0, x, x); blit(bmp, bmp, 0, 0, 2*x, 0, x, x); /* create middle row */ blit(bmp, bmp, 0, 0, 0, x, x, x); rectfill(bmp, x, x, 2*x-1, 2*x-1, 0); blit(bmp, bmp, 0, 0, 2*x, x, x, x); /* create bottom row */ blit(bmp, bmp, 0, 0, 0, 2*x, 3*x, x); } save_bitmap("sierpinski-carpet.pcx", bmp, pal_bw); destroy_bitmap(bmp); return 0; }
Here is a text-mode Perl version of the triangle only (Copying rights as above):
perl -e 'for $y(0..15) {print " " x (1 + $y); for $x (0..15) { print $x & $y ? " " : "\\7";} print "\n"}'
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