feat: add rasterization primitives

src/core/primitives.h

@@ -0,0 +1,50 @@
+#ifndef PRIMITIVES_H_
+#define PRIMITIVES_H_
+
+#include "stddef.h"
+#include "stdlib.h"
+#include "vector.h"
+
+typedef struct {
+  V2 p1;
+  V2 p2;
+} Line;
+
+typedef struct {
+  V2 *points;
+  size_t count;
+  size_t capacity;
+} Polyline;
+
+typedef struct {
+  V2 *points;
+  size_t count;
+  size_t capacity;
+} Polygon;
+
+typedef struct {
+  V2 center;
+  double radius;
+} Circle;
+
+typedef enum { LINE, POLYLINE, POLYGON, CIRCLE } PrimitiveKind;
+
+typedef struct {
+  PrimitiveKind kind;
+  union {
+    Line line;
+    Polyline *polyline;
+    Polygon *polygon;
+    Circle circle;
+  };
+} Primitive;
+
+Polyline *mk_polyline(void);
+void add_point_polyline(Polyline *pl, V2 point);
+void free_polyline(Polyline *pl);
+
+Polygon *mk_polygon(void);
+void add_point_polygon(Polygon *pl, V2 point);
+void free_polygon(Polygon *pl);
+
+#endif // PRIMITIVES_H_