1 files changed, 140 insertions, 0 deletions
diff --git a/board.c b/board.c
new file mode 100644
index 0000000..1a543ee
--- /dev/null
+++ b/board.c
@@ -0,0 +1,140 @@
+#include "board.h"
+
+#include <math.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define NUM_SECTORS (sizeof(SECTORS) / sizeof(*SECTORS))
+#define SECTOR_WIDTH (360.0 / NUM_SECTORS)
+int SECTORS[] = { 20, 1, 18, 4, 13, 6, 10, 15, 2, 17, 3, 19, 7,
+	16, 8, 11, 14, 9, 12, 5 };
+int SECTOR_INDS[NUM_SECTORS];
+double SECTOR_ANGLES[NUM_SECTORS];
+
+char *RING_NAMES[] = {
+	FOREACH_RING(GEN_RING_STRING)
+	"OUT"
+};
+double OUTER_DISTS[] = {
+	FOREACH_RING(GEN_RING_OUTER_DIST)
+};
+double CENTRE_DISTS[sizeof(OUTER_DISTS) / sizeof(*OUTER_DISTS)];
+
+static void init_sectors()
+{
+	for (size_t i = 0; i < NUM_SECTORS; ++i) {
+		SECTOR_INDS[SECTORS[i]-1] = i;
+
+		double angle = 90 - (i * SECTOR_WIDTH);
+		if (angle < 0) angle += 360;
+		SECTOR_ANGLES[i] = angle;
+	}
+}
+
+static void init_centre_dists()
+{
+	CENTRE_DISTS[0] = 0;
+	for (int i = R_25; i < R_OUT; ++i)
+		CENTRE_DISTS[i] = (OUTER_DISTS[i] -
+			((OUTER_DISTS[i] - OUTER_DISTS[i-1]) / 2));
+}
+
+void init_board()
+{
+	init_sectors();
+	init_centre_dists();
+}
+
+int get_sector(double angle)
+{
+	double shifted = angle - 90 - (SECTOR_WIDTH/2);
+	return SECTORS[NUM_SECTORS - 1 -
+		(int)((shifted - (360 * floor(shifted/360))) / SECTOR_WIDTH)];
+}
+
+enum ring get_ring(double radius)
+{
+	for (int i = R_BULL; i < R_OUT; ++i)
+		if (radius < OUTER_DISTS[i])
+			return i;
+
+	return R_OUT;
+}
+
+struct segment get_segment(struct pcoords c)
+{
+	return (struct segment){ .sector = get_sector(c.a),
+		.ring = get_ring(c.r) };
+}
+
+char *segment_name(struct segment seg)
+{
+	char *str = malloc(SEGMENT_MAX_LEN);
+
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wstringop-truncation"
+	if (seg.ring == R_BULL || seg.ring == R_25 || seg.ring == R_OUT)
+		strncpy(str, RING_NAMES[seg.ring], SEGMENT_MAX_LEN);
+	else
+		snprintf(str, SEGMENT_MAX_LEN,
+			(seg.ring == R_TREBLE ? "T%d" :
+				(seg.ring == R_DOUBLE ? "D%d" : "%d")),
+			seg.sector);
+#pragma GCC diagnostic pop
+
+	return str;
+}
+
+int segment_points(struct segment seg)
+{
+	if (seg.ring == R_BULL)
+		return 50;
+	else if (seg.ring == R_25)
+		return 25;
+	else if (seg.ring == R_TREBLE)
+		return 3 * seg.sector;
+	else if (seg.ring == R_DOUBLE)
+		return 2 * seg.sector;
+	else if (seg.ring == R_SMALL || seg.ring == R_BIG)
+		return seg.sector;
+	return 0;
+}
+
+bool segment_is_double(struct segment seg)
+{
+	if (seg.ring == R_DOUBLE || seg.ring == R_BULL)
+		return true;
+	return false;
+}
+
+struct pcoords segment_centre(struct segment seg)
+{
+	return (struct pcoords){ .a = SECTOR_ANGLES[SECTOR_INDS[seg.sector-1]],
+		.r = CENTRE_DISTS[seg.ring] };
+}
+
+struct segment segment_from_name(char *name)
+{
+	int s = 20;
+	enum ring r;
+
+	if (!strcmp(name, "BULL")) {
+		r = R_BULL;
+	} else if (!strcmp(name, "25")) {
+		r = R_25;
+	} else if (name[0] == 'T') {
+		r = R_TREBLE;
+		s = atoi(name+1);
+	} else if (name[0] == 'D') {
+		r = R_DOUBLE;
+		s = atoi(name+1);
+	} else {
+		r = R_BIG;
+		s = atoi(name);
+	}
+
+	return (struct segment){ .sector = s, .ring = r };
+}