C, (78 + 26 * strlen) codici
Ciò è stato sorprendentemente difficile da ottimizzare, soprattutto a causa della possibilità di collisioni di colore nelle linee vicine.
I caratteri vengono convertiti in base 12, quindi ogni personaggio è un numero di 2 cifre. Ogni linea standard contiene quanto segue: puntatore (ora a destra per le linee dispari, a sinistra per le linee pari), duplicato (il numero 12, che è il primo nella pila), premere (1a cifra), moltiplicare, premere (2a cifra), aggiungere , outc, push (1 per le linee dispari, 3 per le linee pari), duplicato, spazi bianchi, puntatore (ora in basso alla fine della linea).
Per evitare le collisioni di colore nelle linee vicine, viene ricordato lo stato dopo il riempimento degli spazi bianchi e la generazione viene ripristinata su di essa se si verifica una collisione. Il prossimo tentativo inizia lì con il colore successivo.
Uscita per "Hello Piet!":
asciipiet2.c
#include "img.h"
#define WIDTH 26
#define OP(op, h, d) int op() { hue += h; dark += d; hue %= 6; dark %= 3; return setp(); }
#define CCMP(c1, c2) (((c1).r == (c2).r) && ((c1).g == (c2).g) && ((c1).b == (c2).b))
#define OPCNT(op) if(op) continue
Color piet[6][2] =
{
{{0xff, 0xc0, 0xc0}, {0xff, 0x00, 0x00}, {0xc0, 0x00, 0x00}},
{{0xff, 0xff, 0xc0}, {0xff, 0xff, 0x00}, {0xc0, 0xc0, 0x00}},
{{0xc0, 0xff, 0xc0}, {0x00, 0xff, 0x00}, {0x00, 0xc0, 0x00}},
{{0xc0, 0xff, 0xff}, {0x00, 0xff, 0xff}, {0x00, 0xc0, 0xc0}},
{{0xc0, 0xc0, 0xff}, {0x00, 0x00, 0xff}, {0x00, 0x00, 0xc0}},
{{0xff, 0xc0, 0xff}, {0xff, 0x00, 0xff}, {0xc0, 0x00, 0xc0}}
};
Color white = {0xff, 0xff, 0xff};
Image img;
int hue, dark, x, y, dx = 1;
void nextline()
{
x -= dx;
dx = -dx;
y += 1;
}
int setp()
{
if(y > 0 && CCMP(piet[hue][dark], imgGetP(img, x, y - 1)))
{
return 1;
}
imgSetP(img, x, y, piet[hue][dark]);
x += dx;
return 0;
}
void whiteto(int to)
{
if(dx == 1)
{
while(x < to) imgSetP(img, x++, y, white);
}
else
{
while(x >= WIDTH - to) imgSetP(img, x--, y, white);
}
}
OP(fill, 0, 0)
OP(pushraw, 0, 1)
OP(pop, 0, 2)
OP(add, 1, 0)
OP(sub, 1, 1)
OP(mul, 1, 2)
OP(divi, 2, 0)
OP(mod, 2, 1)
OP(not, 2, 2)
OP(gt, 3, 0)
OP(pnt, 3, 1)
OP(sw, 3, 2)
OP(dup, 4, 0)
OP(roll, 4, 1)
OP(in, 4, 2)
OP(inc, 5, 0)
OP(out, 5, 1)
OP(outc, 5, 2)
int push(int num);
int pushn(int num) { int i; for(i = 0; i < num - 1; ++i) { if(fill()) return 1; } return pushraw(); }
int push0() { return (push(1) || not()); }
int push8() { return (push(2) || dup() || dup() || mul() || mul()); }
int push9() { return (push(3) || dup() || mul()); }
int push10() { return (push(9) || push(1) || add()); }
int push11() { return (push(9) || push(2) || add()); }
int push(int num)
{
switch(num)
{
case 0: return push0();
case 8: return push8();
case 9: return push9();
case 10: return push10();
case 11: return push11();
default: return pushn(num);
}
}
int main(int argc, char* argv[])
{
char* str;
int len, i;
if(argc != 2)
{
printf("Usage: %s \"string to print\"\n", argv[0]);
return -1;
}
str = argv[1];
len = strlen(str);
imgCreate(img, WIDTH, len + 3);
fill(); push(4); push(3); mul(); push(1); dup(); whiteto(WIDTH - 2);
for(i = 0; i < len; ++i)
{
int var, sx = x, sy = y, sdx = dx, fin = 0, off = rand();
for(var = 0; var < 18 && !fin; var++)
{
x = sx; y = sy; dx = sdx;
hue = ((var + off) % 18) / 3; dark = ((var + off) % 18) % 3;
OPCNT(fill()); OPCNT(pnt());
nextline(); pnt(); dup();
OPCNT(push(str[i] / 12)); OPCNT(mul()); OPCNT(push(str[i] % 12)); OPCNT(add()); OPCNT(outc()); OPCNT(push(2 - dx)); if(i != len - 1) { OPCNT(dup()); }
whiteto(WIDTH - 2);
fin = 1;
}
if (!fin)
{
printf("collision unavoidable\n");
return -1;
}
}
x -= dx;
{
int var, sx = x, sy = y, sdx = dx, fin = 0;
for(var = 0; var < 18 && !fin; var++)
{
x = sx; y = sy; dx = sdx;
hue = var / 3; dark = var % 3;
OPCNT(fill()); OPCNT(pnt()); OPCNT(fill());
fin = 1;
}
if (!fin)
{
printf("collision unavoidable\n");
return -1;
}
}
x -= 2 * dx;
y += 1;
imgSetP(img, x, y, white);
x -= dx;
y += 1;
hue = 0; dark = 1;
fill(); fill(); fill();
imgSave(img, "piet.pnm");
return 0;
}
img.h
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
typedef struct
{
unsigned char r;
unsigned char g;
unsigned char b;
} Color;
typedef struct
{
Color* data;
int width;
int height;
} Image;
#define imgCreate(img, w, h) {\
int length;\
(img).width = (w);\
(img).height = (h);\
length = (img).width * (img).height * sizeof(Color);\
(img).data = malloc(length);\
memset((img).data, 0, length);\
}
#define imgDestroy(img) {\
free((img).data);\
(img).width = 0;\
(img).height = 0;\
}
#define imgGetP(img, x, y) ((img).data[(int)(x) + (int)(y) * (img).width])
#define imgSetP(img, x, y, c) {\
(img).data[(int)(x) + (int)(y) * (img).width] = c;\
}
#define imgLine(img, x, y, xx, yy, c) {\
int x0 = (x), y0 = (y), x1 = (xx), y1 = (yy);\
int dx = abs(x1 - x0), sx = x0 < x1 ? 1 : -1;\
int dy = -abs(y1 - y0), sy = y0 < y1 ? 1 : -1;\
int err = dx + dy, e2;\
\
for(;;)\
{\
imgSetP((img), x0, y0, c);\
if (x0 == x1 && y0 == y1) break;\
e2 = 2 * err;\
if (e2 >= dy) {err += dy; x0 += sx;}\
if (e2 <= dx) {err += dx; y0 += sy;}\
}\
}
#define imgSave(img, fname) {\
FILE* f = fopen((fname), "wb");\
fprintf(f, "P6\n%d %d\n255\n", (img).width, (img).height);\
fwrite((img).data, sizeof(Color), (img).width * (img).height, f);\
fclose(f);\
}
#define imgLoad(img, fname) {\
FILE* f = fopen((fname), "rb");\
char buffer[16];\
int index = 0;\
int field = 0;\
int isP5 = 0;\
unsigned char c = ' ';\
while(field < 4)\
{\
do\
{\
if(c == '#') while(c = fgetc(f), c != '\n');\
} while(c = fgetc(f), isspace(c) || c == '#');\
index = 0;\
do\
{\
buffer[index++] = c;\
} while(c = fgetc(f), !isspace(c) && c != '#' && index < 16);\
buffer[index] = 0;\
switch(field)\
{\
case 0:\
if (strcmp(buffer, "P5") == 0) isP5 = 1;\
else if (strcmp(buffer, "P6") == 0) isP5 = 0;\
else fprintf(stderr, "image format \"%s\" unsupported (not P5 or P6)\n", buffer), exit(1);\
break;\
case 1:\
(img).width = atoi(buffer);\
break;\
case 2:\
(img).height = atoi(buffer);\
break;\
case 3:\
index = atoi(buffer);\
if (index != 255) fprintf(stderr, "image format unsupported (not 255 values per channel)\n"), exit(1);\
break;\
}\
field++;\
}\
imgCreate((img), (img).width, (img).height);\
if (isP5)\
{\
int length = (img).width * (img).height;\
for(index = 0; index < length; ++index)\
{\
(img).data[index].r = (img).data[index].g = (img).data[index].b = fgetc(f);\
}\
}\
else\
{\
fread((img).data, sizeof(Color), (img).width * (img).height, f);\
}\
fclose(f);\
}
