1 files changed, 80 insertions, 0 deletions
diff --git a/inc/cad/construction.h b/inc/cad/construction.h
new file mode 100644
index 0000000..eee5fa3
--- /dev/null
+++ b/inc/cad/construction.h
@@ -0,0 +1,80 @@
+#pragma once
+#include <cglm/cglm.h>
+
+enum operation {
+	CMD_VALUE_INPUT,
+	CMD_ORIGIN,
+	CMD_LINE_X,
+	CMD_CIRCLE_CENTER_RADIUS,
+	CMD_CIRCLE_CENTER_POINT,
+	CMD_LINE_POINT_POINT,
+	CMD_LINE_POINT_LINE_ANGLE,
+	CMD_POINT_CIRCLE_LINE,
+	CMD_POINT_CIRCLE_CIRCLE,
+	CMD_POINT_LINE_LINE,
+
+	// Additional operations we need to handle explicitly to avoid degenerate
+	// cases
+	CMD_LINE_CIRCLE_CIRCLE_TANGENT,
+	CMD_LINE_LINE_DISTANCE_PARALLEL,
+};
+
+struct point {
+	vec2 pos;
+};
+
+struct circle {
+	vec2 center;
+	double radius;
+};
+
+struct line {
+	vec2 norm;
+	double C;
+};
+
+enum EType {
+	ETYPE_VALUE,
+	ETYPE_CIRCLE,
+	ETYPE_POINT,
+	ETYPE_LINE,
+};
+
+struct element {
+	enum EType type;
+
+	union {
+		double value;
+		struct circle circle;
+		struct point point;
+		struct line line;
+	};
+};
+
+struct command {
+	enum operation op;
+	uint8_t root;
+	bool hidden;
+
+	struct element *arg1;
+	struct element *arg2;
+	struct element *arg3;
+
+	struct element result;
+
+	struct command *next;
+};
+
+struct drawing {
+	struct command *root;
+	struct command *tail;
+
+	struct command *error;
+};
+
+struct element* insert_cmd(struct drawing *drawing, struct command cmd);
+void execute_drawing(struct drawing *drawing, double inputs[]);
+
+bool circle_line_intersect(struct circle circle, struct line line, uint8_t root, struct point *point);
+void line_through_points(struct point p1, struct point p2, struct line* l);
+void line_line_intersect(struct line l1, struct line l2, struct point* p);