add util functions for (x,y) to (file, rank) and vice versa - chess-puzzles - chess puzzle book generator
(HTM) git clone git://git.codemadness.org/chess-puzzles
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---
(DIR) commit 6af435b4416d90cb27e447e2f0bf505721374e12
(DIR) parent b7a52ecde26555a060898faaa5643851368c7467
(HTM) Author: Hiltjo Posthuma <hiltjo@codemadness.org>
Date: Mon, 25 Dec 2023 18:49:58 +0100
add util functions for (x,y) to (file, rank) and vice versa
Diffstat:
M fen.c | 46 +++++++++++++++++++++++--------
1 file changed, 35 insertions(+), 11 deletions(-)
---
(DIR) diff --git a/fen.c b/fen.c
@@ -97,12 +97,36 @@ getpiece(int x, int y)
}
int
+xtofile(int c)
+{
+ return 'a' + c;
+}
+
+int
+ytorank(int c)
+{
+ return '8' - c;
+}
+
+int
+filetox(int c)
+{
+ return c - 'a';
+}
+
+int
+ranktoy(int c)
+{
+ return '8' - c;
+}
+
+int
squaretoxy(const char *s, int *x, int *y)
{
if (*s >= 'a' && *s <= 'h' &&
*(s + 1) >= '1' && *(s + 1) <= '8') {
- *x = *s - 'a';
- *y = '8' - *(s + 1);
+ *x = filetox(*s);
+ *y = ranktoy(*(s + 1));
return 1;
}
return 0;
@@ -153,8 +177,8 @@ showboardfen(void)
putchar(' ');
if (enpassantsquare[0] != -1 && enpassantsquare[1] != -1) {
- putchar('a' + enpassantsquare[0]);
- putchar('8' - enpassantsquare[1]);
+ putchar(xtofile(enpassantsquare[0]));
+ putchar(ytorank(enpassantsquare[1]));
} else {
putchar('-');
}
@@ -277,7 +301,7 @@ output_svg(void)
color = highlight[y][x] ? lightsquarehi : lightsquare;
printf("<text x=\"%d\" y=\"%d\" fill=\"#%02x%02x%02x\" text-anchor=\"end\" style=\"font-family: sans-serif; font-size: 10px\">%c</text>\n",
- (ix + 1) * 45 - 2, (iy * 45) + 10, color[0], color[1], color[2], '8' - y);
+ (ix + 1) * 45 - 2, (iy * 45) + 10, color[0], color[1], color[2], ytorank(y));
}
iy = 7;
y = flipboard ? 0 : 7;
@@ -298,7 +322,7 @@ output_svg(void)
}
printf("<text x=\"%d\" y=\"%d\" fill=\"#%02x%02x%02x\" text-anchor=\"start\" style=\"font-family: sans-serif; font-size: 10px\">%c</text>\n",
- (ix * 45) + 2, (iy + 1) * 45 - 3, color[0], color[1], color[2], x + 'a');
+ (ix * 45) + 2, (iy + 1) * 45 - 3, color[0], color[1], color[2], xtofile(x));
}
}
@@ -384,7 +408,7 @@ output_tty(void)
SETBGCOLOR(color[0], color[1], color[2]);
if (showcoords) {
fputs("\x1b[97m", stdout); /* bright white */
- putchar('8' - y);
+ putchar(ytorank(y));
putchar(' ');
} else {
fputs(" ", stdout);
@@ -455,7 +479,7 @@ output_ascii(void)
}
if (showcoords) {
putchar(' ');
- putchar('8' - y);
+ putchar(ytorank(y));
}
putchar('\n');
}
@@ -857,15 +881,15 @@ parsemoves(const char *moves)
if (piece != 'p' && piece != 'P') {
pgn("%c", toupper(piece));
/* TODO: check ambiguity for certain pieces and make the notation shorter */
- pgn("%c%c", 'a' + x, '8' - y);
+ pgn("%c%c", xtofile(x), ytorank(y));
}
if (tookpiece) {
/* pawn captures are prefixed by the file letter */
if (piece == 'p' || piece == 'P')
- pgn("%c", 'a' + x);
+ pgn("%c", xtofile(x));
pgn("x");
}
- pgn("%c%c", 'a' + x2, '8' - y2);
+ pgn("%c%c", xtofile(x2), ytorank(y2));
/* possible promotion: queen, knight, bishop */
if (*s == 'q' || *s == 'n' || *s == 'b') {