1 files changed, 256 insertions, 0 deletions
diff --git a/web/svg.c b/web/svg.c
new file mode 100644
index 0000000..6744ac6
--- /dev/null
+++ b/web/svg.c
@@ -0,0 +1,256 @@
+#include "svg.h"
+
+#include "board.h"
+#include "comp.h"
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <emscripten/emscripten.h>
+
+#define NUM_SECTORS 20
+#define SECTOR_WIDTH 18.0
+
+#define C_BLACK "#272b2c"
+#define C_WHITE "#fbe3ba"
+#define C_RED "#f6302f"
+#define C_GREEN "#22912d"
+#define C_WIRE "#909ca0"
+#define C_WIRE_INNER "#d8e6ec"
+
+struct elem {
+	char *name;
+	int n_attrs, size_attrs;
+	char **attr_names, **attr_vals;
+	char *content;
+};
+
+struct elem *elem_init(char *name, int size_attrs)
+{
+	struct elem *e = malloc(sizeof(*e));
+
+	size_t size = strlen(name) + 1;
+	e->name = malloc(size * sizeof(*(e->name)));
+	memcpy(e->name, name, size);
+
+	e->n_attrs = 0;
+	e->size_attrs = size_attrs;
+	e->attr_names = malloc(size_attrs * sizeof(*(e->attr_names)));
+	e->attr_vals = malloc(size_attrs * sizeof(*(e->attr_vals)));
+	e->content = NULL;
+
+	return e;
+}
+
+void elem_free(struct elem *e)
+{
+	for(int i = 0; i < e->n_attrs; ++i) {
+		free(e->attr_names[i]);
+		free(e->attr_vals[i]);
+	}
+
+	free(e->content);
+	free(e->attr_names);
+	free(e->attr_vals);
+	free(e->name);
+	free(e);
+}
+
+void elem_add_attr(struct elem *e, char *name, char *val)
+{
+	if (e->n_attrs == e->size_attrs) {
+		e->size_attrs *= 2;
+		e->attr_names = realloc(e->attr_names,
+			e->size_attrs * sizeof(*(e->attr_names)));
+		e->attr_vals = realloc(e->attr_vals,
+			e->size_attrs * sizeof(*(e->attr_vals)));
+	}
+
+	size_t size = strlen(name) + 1;
+	e->attr_names[e->n_attrs] = malloc(size);
+	memcpy(e->attr_names[e->n_attrs], name, size);
+
+	size = strlen(val) + 1;
+	e->attr_vals[e->n_attrs] = malloc(size);
+	memcpy(e->attr_vals[e->n_attrs++], val, size);
+}
+
+void elem_add_attr_double(struct elem *e, char *name, double val)
+{
+	char str[512];
+	sprintf(str, "%f", val);
+	elem_add_attr(e, name, str);
+}
+
+// draws a ring if angles are equal
+struct elem *gen_arc(double a1, double a2, double r1, double r2, char *col)
+{
+	struct ccoords cc1 = pol_to_cart((struct pcoords){
+		.a = (a1 == a2 ? 1 : a2), .r = r1 });
+	struct ccoords cc2 = pol_to_cart((struct pcoords){
+		.a = (a1 == a2 ? 0 : a1), .r = r1 });
+	struct ccoords cc3 = pol_to_cart((struct pcoords){
+		.a = (a1 == a2 ? 0 : a1), .r = r2 });
+	struct ccoords cc4 = pol_to_cart((struct pcoords){
+		.a = (a1 == a2 ? 1 : a2), .r = r2 });
+
+	struct elem *e = elem_init("path", 2);
+	elem_add_attr(e, "fill", col);
+
+	char buf[512];
+	int buflen = 0;
+	buflen += sprintf(buf + buflen, "M%f %f", cc1.x, cc1.y);
+	buflen += sprintf(buf + buflen, "A%f %f 0 0 0 %f %f",
+		r1, r1, cc2.x, cc2.y);
+	if (a1 == a2)
+		buflen += sprintf(buf + buflen, "A%f %f 0 1 0 %f %f",
+			r1, r1, cc1.x, cc1.y);
+	buflen += sprintf(buf + buflen, "L%f %f", cc3.x, cc3.y);
+	buflen += sprintf(buf + buflen, "A%f %f 0 0 1 %f %f",
+		r2, r2, cc4.x, cc4.y);
+	if (a1 == a2)
+		buflen += sprintf(buf + buflen, "A%f %f 0 1 1 %f %f",
+			r2, r2, cc3.x, cc3.y);
+	buf[buflen++] = 'Z';
+	buf[buflen++] = 0;
+	elem_add_attr(e, "d", buf);
+
+	return e;
+}
+
+struct elem *gen_segment(double a, double r1, double r2, char *col)
+{
+	return gen_arc(a - SECTOR_WIDTH/2, a + SECTOR_WIDTH/2, r1, r2, col);
+}
+
+struct elem *gen_ring(double r, double w, char *col)
+{
+	return gen_arc(0, 0, r - w/2, r + w/2, col);
+}
+
+struct elem *gen_circle(double r, char *col)
+{
+	struct elem *e = elem_init("circle", 2);
+	elem_add_attr(e, "fill", col);
+	elem_add_attr_double(e, "r", r);
+
+	return e;
+}
+
+struct elem *gen_line(double a, double r1, double r2, double w, char *col)
+{
+	struct ccoords cc1 = pol_to_cart((struct pcoords){ .a = a, .r = r1 });
+	struct ccoords cc2 = pol_to_cart((struct pcoords){ .a = a, .r = r2 });
+
+	struct elem *e = elem_init("line", 6);
+	elem_add_attr(e, "stroke", col);
+	elem_add_attr_double(e, "x1", cc1.x);
+	elem_add_attr_double(e, "y1", cc1.y);
+	elem_add_attr_double(e, "x2", cc2.x);
+	elem_add_attr_double(e, "y2", cc2.y);
+	elem_add_attr_double(e, "stroke-width", w);
+
+	return e;
+}
+
+int draw_spider(int elemc, struct elem **elemv)
+{
+	for (int i = 5; i > 1; --i) {
+		elemv[elemc++] = gen_ring(OUTER_DISTS[i], WIRE_WIDTH, C_WIRE);
+		elemv[elemc++] = gen_ring(OUTER_DISTS[i], WIRE_WIDTH/2, C_WIRE_INNER);
+	}
+
+	for (int i = 0; i < NUM_SECTORS; ++i) {
+		double a = 90 - i*SECTOR_WIDTH - SECTOR_WIDTH/2;
+		if (a < 0) a += 360;
+
+		elemv[elemc++] = gen_line(a, OUTER_DISTS[1], OUTER_DISTS[5] + 10,
+			WIRE_WIDTH, C_WIRE);
+		elemv[elemc++] = gen_line(a, OUTER_DISTS[1], OUTER_DISTS[5] + 10,
+			WIRE_WIDTH/2, C_WIRE_INNER);
+	}
+
+	for (int i = 1; i >= 0; --i) {
+		elemv[elemc++] = gen_ring(OUTER_DISTS[i], WIRE_WIDTH, C_WIRE);
+		elemv[elemc++] = gen_ring(OUTER_DISTS[i], WIRE_WIDTH/2, C_WIRE_INNER);
+	}
+
+	return elemc;
+}
+
+int draw_numbers(int elemc, struct elem **elemv)
+{
+	elemv[elemc++] = gen_ring(DIAMETER/2 - WIRE_WIDTH*4, WIRE_WIDTH, "#ddd");
+
+	int r = DIAMETER/2 - 33/2;
+	for (int i = 0; i < 20; ++i) {
+		struct elem *e = elemv[elemc++] = elem_init("text", 5);
+		elem_add_attr(e, "font-size", "33");
+		elem_add_attr(e, "fill", "#fff");
+		elem_add_attr(e, "text-anchor", "middle");
+		elem_add_attr(e, "dominant-baseline", "central");
+
+		char buf[512];
+		double a = 90 - i*SECTOR_WIDTH;
+		if (a < 0) a += 360;
+		struct ccoords cc = pol_to_cart((struct pcoords){ .a = a, .r = r });
+		sprintf(buf, "scale(1 -1) translate(%f %f) rotate(%f)",
+			cc.x, -cc.y, a <= 180 ? 90 -a : 270 -a);
+		elem_add_attr(e, "transform", buf);
+
+		e->content = malloc(3);
+		sprintf(e->content, "%d", SECTORS[i]);
+	}
+
+	return elemc;
+}
+
+void draw_elemv(int layer, int elemc, struct elem **elemv)
+{
+	EM_ASM({svgDrawElemv($0, $1, $2, $3, $4, $5, $6, $7)},
+		layer, elemc, elemv,
+		offsetof(struct elem, name), offsetof(struct elem, n_attrs),
+		offsetof(struct elem, attr_names), offsetof(struct elem, attr_vals),
+		offsetof(struct elem, content));
+}
+
+void svg_draw_board()
+{
+	struct elem **elemv = malloc(200 * sizeof(*elemv));
+	int elemc = 0;
+
+	elemv[elemc++] = gen_circle(DIAMETER/2, C_BLACK);
+
+	for (int i = 5; i > 1; --i) {
+		for (int j = 0; j < NUM_SECTORS; ++j) {
+			double a = 90 - j*SECTOR_WIDTH;
+			if (a < 0) a += 360;
+			elemv[elemc++] = gen_segment(a, OUTER_DISTS[i-1], OUTER_DISTS[i],
+				i%2 ? (j%2 ? C_GREEN : C_RED) : (j%2 ? C_WHITE : C_BLACK));
+		}
+	}
+
+	elemv[elemc++] = gen_circle(OUTER_DISTS[1], C_GREEN);
+	elemv[elemc++] = gen_circle(OUTER_DISTS[0], C_RED);
+
+	elemc = draw_spider(elemc, elemv);
+	elemc = draw_numbers(elemc, elemv);
+
+	draw_elemv(0, elemc, elemv);
+
+	for (int i = 0; i < elemc; ++i)
+		free(elemv[i]);
+	free(elemv);
+}
+
+void svg_draw_point(double x, double y) {
+	struct elem *e = gen_circle(8, "#33f");
+	elem_add_attr(e, "stroke", "#ff0");
+	elem_add_attr(e, "stroke-width", "2");
+	elem_add_attr_double(e, "cx", x);
+	elem_add_attr_double(e, "cy", y);
+
+	draw_elemv(1, 1, &e);
+	elem_free(e);
+}