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Code: Select all

directions = ['>', '>', '<', 'v', 'v', '>', '>', '^', '^', 'v', '>', 'v', '>', '>', '^', '<', 'v', 'v', '>', '>', '>', '^', '^', '^', '>', '>', 'v', '<', '<', '>', '>', 'v', 'v', '>', '^', '^', '^', '>', 'v', '>', 'v', '>', 'v', '>', '^', '^', '^', 'v', 'v', 'v', '>', '>', '>', '^', '<', '<', '^', '^', '>', '>', '>', 'v', '>', 'v', '>', 'v', '>', '^', '>', '^', '>', '^', '>', 'v', '>', 'v', '>', 'v', '>', '^', '>', '^', '>', '^', '>', '>', '>', '<', '<', 'v', 'v', '>', '<', 'v', '>', '>', '>', '^', '^', '^', '>', '>', 'v', 'v', '<', '<', '>', 'v', '>', '>', '>', '>', '^', '^', 'v', 'v', '>', '>', '^', '<', '^', '>', '<', 'v', '>', 'v', '>', '>', '>', '^', '^', '^', '>', '>', '<', '<', 'v', 'v', '>', '<', 'v', '>', '>', '>', '>', '^', '^', '^', '<', '>', '>', '<', 'v', 'v', 'v', '>', '>', '>', '^', '^', '^', '>', '>', '<', '<', 'v', 'v', 'v', '>', '>', '>', '^', '^', '^', 'v', '>', '>', '^', 'v', 'v', 'v', '>']
from PIL import Image
im = Image.open('telecran.png')
x,y = 10,10
colour = (0,0,0)
for i in directions:
    for j in xrange(6):
        im.putpixel((x,y),colour)
        if i == '>': x+=1
        if i == '<': x-=1
        if i == 'v': y+=1
        if i == '^': y-=1
im.show()
im.close()

Code: Select all

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <ctype.h>
#include <gd.h>

#define BY_PIXELS 4

struct coord {
    int x;
    int y;
};

void
usage(char *name) {
    fprintf(stderr, "%s output-file <direction string>\n", name);
}

int
main(int argc, char **argv) {
    gdImagePtr im;
    FILE *jpegout;
    int black, white, chr;
    char *sp;
    struct coord xy;

    if (argc < 3) {
        fprintf(stderr, "Didn't provide sufficient arguments.\n");
        usage(argv[0]);
        exit(EXIT_FAILURE);
    }

    im = gdImageCreate(256, 256);

    black = gdImageColorAllocate(im, 0,0,0);
    white = gdImageColorAllocate(im, 255,255,255);
    xy.x = 10;
    xy.y = 128;

    sp = argv[2];

    while (*sp != '\0') {
        chr = tolower((int)*sp);

        switch (chr) {
            case 'u':
               gdImageLine(im, xy.x, xy.y, xy.x, xy.y - BY_PIXELS, white);
               xy.y -= BY_PIXELS;
               break;
            case 'd':
               gdImageLine(im, xy.x, xy.y, xy.x, xy.y + BY_PIXELS, white);
               xy.y += BY_PIXELS;
               break;
            case 'l':
               gdImageLine(im, xy.x, xy.y, xy.x - BY_PIXELS, xy.y, white);
               xy.x -= BY_PIXELS;
               break;
            case 'r':
               gdImageLine(im, xy.x, xy.y, xy.x + BY_PIXELS, xy.y, white);
               xy.x += BY_PIXELS;
               break;
            default:
               fprintf(stderr, "Bad character given.\n");
               gdImageDestroy(im);
               exit(EXIT_FAILURE);
        }
        sp++;
    }

    if ((jpegout = fopen(argv[1], "wb")) == NULL) {
        perror(argv[1]);
        gdImageDestroy(im);
        exit(EXIT_FAILURE);
    }

    gdImageJpeg(im, jpegout, -1);
    gdImageDestroy(im);

    fclose(jpegout);

    return 0;
}