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5.0 KiB
5.0 KiB
Autostereogram
TODO
Random Dots
TODO
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]w@x4EY!{ .:,oX#]w@x4EY!{ .:,oX#]w@x4EY!{ .:,oX#]w@x4EY!{ .:,oX#]w@x4EY!{ .:,oX#]w@x4EY!{ .:,oX#
If you look at this image the correct way, you'll see a 3D image of big letters spelling out LRS.
The following is a C program that generates the above image.
#include <stdio.h>
#define PATTERN_SIZE 16
#define RES_X 75
#define RES_Y 20
#define PATTERN_SEED_SIZE 32
char patternSeed[PATTERN_SEED_SIZE] = " .:,oX#r-'/=*miQ)35;_0p]w@x4EY!{";
char depth[RES_X * RES_Y + 1] = // must be big and simple to be easily seen
" "
" "
" "
" 1111111111111 "
" 11111111111 22222222222222222 "
" 1111111 222222222222222222 1111111111 "
" 1111111 2222222 2222222 1111111111111111 "
" 1111111 2222222 222222 11111111 111111 "
" 1111111 2222222 222222 1111111 111111 "
" 1111111 2222222 2222222 11111111 "
" 1111111 2222222222222222 111111111111 "
" 1111111 11 2222222222222222 111111111111 "
" 1111111 11 2222222 222222 111111111 "
" 1111111 1111 2222222 222222 1111111 11111111 "
" 1111111111111111111 2222222 222222 1111111 1111111 "
" 11111111111111111111 22222222 2222222 11111111 11111111 "
" 2222222222 22222222 1111111111111111111 "
" 1111111111111 "
" "
" ";
char buffer1[PATTERN_SIZE + 1];
char buffer2[PATTERN_SIZE + 1];
int charToDepth(char c)
{
return c == ' ' ? 0 : (c - '0');
}
int main(void)
{
const char *c = depth;
char *lineCurrent, *linePrev;
buffer1[PATTERN_SIZE] = 0;
buffer2[PATTERN_SIZE] = 0;
for (int j = 0; j < RES_Y; ++j)
{
for (int i = 0; i < PATTERN_SIZE; ++i) // initiate first pattern from seed
buffer1[i] = patternSeed[(i + (j * 13)) % PATTERN_SEED_SIZE];
lineCurrent = buffer1;
linePrev = buffer2;
for (int i = 0; i < RES_X; ++i)
{
if (i % PATTERN_SIZE == 0)
{
printf("%s",lineCurrent); // print the rendered line
char *tmp = lineCurrent; // swap previous and current buffer
lineCurrent = linePrev;
linePrev = tmp;
}
lineCurrent[i % PATTERN_SIZE] = // draw the offset pixel
linePrev[(PATTERN_SIZE + i + charToDepth(*c)) % PATTERN_SIZE];
c++;
}
printf("%s\n",lineCurrent); // print also the last buffer
}
return 0;
}