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	option to flip the board - chess-puzzles - chess puzzle book generator
	git clone git://git.codemadness.org/chess-puzzles
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	---
	commit 3d921c8e0e2011ae994e508e89fc71086fffd598
	parent 3c9f4a2be304b3f0d197d69bea715ee0c9e29570
	Author: Hiltjo Posthuma <[email protected]>
	Date: Wed, 20 Dec 2023 21:54:11 +0100

	option to flip the board

	Diffstat:
	M fen_to_svg.c \| 115 +++++++++++++++++++++--------…

	1 file changed, 80 insertions(+), 35 deletions(-)
	---
	diff --git a/fen_to_svg.c b/fen_to_svg.c
	@@ -1,4 +1,4 @@
	-/* TODO: option to flip board? */
	+/* TODO: output for PGN notation for moves */

	#include <ctype.h>
	#include <stdio.h>
	@@ -26,7 +26,8 @@ static const int lightsquare[] = { 0xf0, 0xd9, 0xb5 };
	static const int darksquarehi[] = { 0xaa, 0xa2, 0x3a };
	static const int lightsquarehi[] = { 0xcd, 0xd2, 0x6a };

	-static const int showcoords = 1; /* config: show board coordinates? */
	+static int showcoords = 1; /* config: show board coordinates? */
	+static int flipboard = 0; /* config: flip board ? */

	int
	isvalidsquare(int x, int y)
	@@ -159,7 +160,7 @@ void
	svg_showboard(void)
	{
	const int *color;
	- int x, y, piece;
	+ int ix, iy, x, y, piece;

	fputs("<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n"
	"<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www…
	@@ -170,8 +171,12 @@ svg_showboard(void)
	showboardfen();
	fputs(" -->\n", stdout);

	- for (y = 0; y < 8; y++) {
	- for (x = 0; x < 8; x++) {
	+ for (iy = 0; iy < 8; iy++) {
	+ y = flipboard ? 7 - iy : iy;
	+
	+ for (ix = 0; ix < 8; ix++) {
	+ x = flipboard ? 7 - ix : ix;
	+
	if (x % 2 == 0) {
	if (y % 2 == 0)
	color = highlight[y][x] ? lightsquareh…
	@@ -185,11 +190,11 @@ svg_showboard(void)
	}

	printf("<g><rect x=\"%d\" y=\"%d\" width=\"45\" height…
	- x * 45, y * 45, color[0], color[1], color[2]);
	+ ix * 45, iy * 45, color[0], color[1], color[2]…

	piece = getpiece(x, y);
	if (piece) {
	- printf("<g transform=\"translate(%d %d)\">", x…
	+ printf("<g transform=\"translate(%d %d)\">", i…
	svg_showpiece(piece);
	fputs("</g>\n", stdout);
	}
	@@ -197,23 +202,47 @@ svg_showboard(void)
	}

	if (showcoords) {
	- x = 7;
	- for (y = 0; y < 8; y++) {
	- if (y % 2 == 0)
	- color = highlight[y][x] ? lightsquarehi : ligh…
	- else
	- color = highlight[y][x] ? darksquarehi : darks…
	+ ix = 7;
	+ x = flipboard ? 0 : 7;
	+ for (iy = 0; iy < 8; iy++) {
	+ y = flipboard ? 7 - iy : iy;
	+
	+ /* inverse square color for text */
	+ if (x % 2 == 0) {
	+ if (y % 2 == 0)
	+ color = highlight[y][x] ? darksquarehi…
	+ else
	+ color = highlight[y][x] ? lightsquareh…
	+ } else {
	+ if (y % 2 == 0)
	+ color = highlight[y][x] ? lightsquareh…
	+ else
	+ color = highlight[y][x] ? darksquarehi…
	+ }
	+
	printf("<text x=\"%d\" y=\"%d\" fill=\"#%02x%02x%02x\"…
	- (x + 1) * 45 - 2, (y * 45) + 10, color[0], col…
	+ (ix + 1) * 45 - 2, (iy * 45) + 10, color[0], c…
	}
	- y = 7;
	- for (x = 0; x < 8; x++) {
	- if (x % 2 == 0)
	- color = highlight[y][x] ? lightsquarehi : ligh…
	- else
	- color = highlight[y][x] ? darksquarehi : darks…
	+ iy = 7;
	+ y = flipboard ? 0 : 7;
	+ for (ix = 0; ix < 8; ix++) {
	+ x = flipboard ? 7 - ix : ix;
	+
	+ /* inverse square color for text */
	+ if (x % 2 == 0) {
	+ if (y % 2 == 0)
	+ color = highlight[y][x] ? darksquarehi…
	+ else
	+ color = highlight[y][x] ? lightsquareh…
	+ } else {
	+ if (y % 2 == 0)
	+ color = highlight[y][x] ? lightsquareh…
	+ else
	+ color = highlight[y][x] ? darksquarehi…
	+ }
	+
	printf("<text x=\"%d\" y=\"%d\" fill=\"#%02x%02x%02x\"…
	- (x * 45) + 2, (y + 1) * 45 - 3, color[0], colo…
	+ (ix * 45) + 2, (iy + 1) * 45 - 3, color[0], co…
	}
	}

	@@ -255,7 +284,7 @@ void
	tty_showboard(void)
	{
	const int *color;
	- int x, y, piece;
	+ int ix, iy, x, y, piece;

	printf("Board FEN:\n");
	showboardfen();
	@@ -271,13 +300,17 @@ tty_showboard(void)
	SETFGCOLOR(0x00, 0x00, 0x00);
	putchar('\n');

	- for (y = 0; y < 8; y++) {
	+ for (iy = 0; iy < 8; iy++) {
	+ y = flipboard ? 7 - iy : iy;
	+
	color = border;
	SETBGCOLOR(color[0], color[1], color[2]);
	SETFGCOLOR(0xff, 0xff, 0xff);
	fputs(" ", stdout);

	- for (x = 0; x < 8; x++) {
	+ for (ix = 0; ix < 8; ix++) {
	+ x = flipboard ? 7 - ix : ix;
	+
	if (x % 2 == 0) {
	if (y % 2 == 0)
	color = highlight[y][x] ? lightsquareh…
	@@ -326,10 +359,14 @@ tty_showboard(void)
	color = border;
	SETBGCOLOR(color[0], color[1], color[2]);
	SETFGCOLOR(0xff, 0xff, 0xff);
	- if (showcoords)
	- fputs(" a b c d e f g h ", stdout);
	- else
	+ if (showcoords) {
	+ if (flipboard)
	+ fputs(" h g f e d c b a ", stdout);
	+ else
	+ fputs(" a b c d e f g h ", stdout);
	+ } else {
	fputs(" ", stdout);
	+ }
	printf("\x1b[0m"); /* reset */
	printf("\n");
	}
	@@ -355,15 +392,19 @@ ascii_showboard(void)
	int hi[3] = { '>', ' ', '<' };
	int dark[3] = { '.', '.', '.' };
	int light[3] = { ' ', ' ', ' ' };
	- int *color, x, y, piece;
	+ int *color, ix, iy, x, y, piece;

	printf("Board FEN:\n");
	showboardfen();
	printf("\n\n");

	- for (y = 0; y < 8; y++) {
	+ for (iy = 0; iy < 8; iy++) {
	+ y = flipboard ? 7 - iy : iy;
	+
	fputs("+---+---+---+---+---+---+---+---+\n", stdout);
	- for (x = 0; x < 8; x++) {
	+ for (ix = 0; ix < 8; ix++) {
	+ x = flipboard ? 7 - ix : ix;
	+
	if (x % 2 == 0) {
	if (y % 2 == 0)
	color = highlight[y][x] ? hi : light;
	@@ -375,8 +416,8 @@ ascii_showboard(void)
	else
	color = highlight[y][x] ? hi : light;
	}
	-
	- if (x == 0)
	+
	+ if (ix == 0)
	putchar('\|');
	putchar(color[0]);
	piece = getpiece(x, y);
	@@ -394,8 +435,12 @@ ascii_showboard(void)
	putchar('\n');
	}
	fputs("+---+---+---+---+---+---+---+---+\n", stdout);
	- if (showcoords)
	- printf(" a \| b \| c \| d \| e \| f \| g \| h \|\n");
	+ if (showcoords) {
	+ if (flipboard)
	+ printf(" h \| g \| f \| e \| d \| c \| b \| a \|\n");
	+ else
	+ printf(" a \| b \| c \| d \| e \| f \| g \| h \|\n");
	+ }

	fputs("\n", stdout);
	}
	@@ -467,7 +512,7 @@ main(int argc, char *argv[])
	black_can_castle[1] = 1;
	}
	break;
	- case 3: /* TODO: en-passant square, rest of the fields */
	+ case 3: /* en passant square */
	if (s >= 'a' && s <= 'h' &&
	(s + 1) >= '1' && (s + 1) >= '6') {