Add quad example

1 files changed, 90 insertions, 0 deletions

diff --git a/examples/quad.c b/examples/quad.c
new file mode 100644
index 0000000..878fba3
--- /dev/null
+++ b/examples/quad.c
@@ -0,0 +1,90 @@
+#include "cad.h"
+#include "cad/svg.h"
+#include "cad/debug.h"
+
+void draw_from_constraints(struct constraints *c, struct topology *t, struct canvas *cv) {
+	struct drawing drawing = {};
+	struct subassembly assemblies[16] = {};
+	size_t assemblies_num;
+	bool rc = solve_constraints(c, &drawing, assemblies, &assemblies_num);
+	assert(rc);
+
+	// Copy over all the parameter values to a new array
+	// @PERF: Maybe we should just store them in a separate array to start with
+	double *params = malloc(sizeof(double) * (c->length));
+	for(size_t i = 0; i < c->length; i++) {
+		params[i] = c->elements[i].v;
+	}
+
+	place_points(&drawing, params);
+	free(params);
+
+	reconstruct_drawing(c, assemblies, &assemblies_num);
+	print_subassemblies(c, assemblies, assemblies_num);
+
+	begin_drawing(cv);
+	draw_topology(cv, t);
+	draw_constraints(cv, c);
+	end_drawing(cv);
+
+	free_drawing(&drawing);
+}
+
+int main(int argc, char *argv[]) {
+	struct constraints constraints = {};
+	struct topology topo = {};
+
+	struct component p1 = {.type = COM_POINT};
+	struct component p2 = {.type = COM_POINT};
+	struct component p3 = {.type = COM_POINT};
+	struct component p4 = {.type = COM_POINT};
+
+	struct component l1 = {.type = COM_LINE};
+	struct component l2 = {.type = COM_LINE};
+	struct component l3 = {.type = COM_LINE};
+	struct component l4 = {.type = COM_LINE};
+
+	add_constraint(&constraints, (struct constraint[]){
+		// Make a triangle
+		PP_DISTANCE(&p1, &p2, 10),
+		PP_DISTANCE(&p4, &p1, 20),
+
+		POINT_ON_LINE(&p1, &l1),
+		POINT_ON_LINE(&p2, &l1),
+
+		POINT_ON_LINE(&p2, &l2),
+		POINT_ON_LINE(&p3, &l2),
+
+		POINT_ON_LINE(&p3, &l3),
+		POINT_ON_LINE(&p4, &l3),
+
+		POINT_ON_LINE(&p4, &l4),
+		POINT_ON_LINE(&p1, &l4),
+
+		LL_ANGLE(&l1, &l2, DEG(90)),
+		LL_ANGLE(&l2, &l3, DEG(90)),
+		LL_ANGLE(&l3, &l4, DEG(90)),
+
+		CEND(),
+	});
+
+	add_fragment(&topo, (struct topology_elem[]){
+		TOPO_MOVETO(&p1),
+		TOPO_LINETO(&p2),
+		TOPO_LINETO(&p3),
+		TOPO_LINETO(&p4),
+		TOPO_LINETO(&p1),
+
+		TOPO_END(),
+	});
+
+	struct canvas canvas = {
+		.state = CANVAS_INIT,
+		.f = stdout,
+	};
+
+	draw_from_constraints(&constraints, &topo, &canvas);
+
+	free_constraints(&constraints);
+	return 0;
+}