merged duplicated code regarding GPCPolygon

geo/GPCPolygon2.h

@@ -0,0 +1,137 @@
+#ifndef GPCPOLYGON2_H
+#define GPCPOLYGON2_H
+
+#include "../lib/gpc/gpc.cpp.h"
+
+class GPCPolygon2 {
+
+	struct GPCPolygon : gpc_polygon {
+		GPCPolygon() {
+			num_contours = 0;
+			contour = nullptr;
+			hole = nullptr;
+		}
+
+		// no copy or move
+		GPCPolygon(const GPCPolygon& o) = delete;
+		GPCPolygon(GPCPolygon&& o) = delete;
+
+		~GPCPolygon() {
+			if (contour) {
+				gpc_free_polygon(this);
+				//free(contour->vertex); contour->vertex = nullptr;
+			}
+			free(contour); contour = nullptr;
+			free(hole); hole = nullptr;
+		}
+
+		GPCPolygon& operator = (const GPCPolygon& o) = delete;
+		GPCPolygon& operator = (GPCPolygon&& o) = delete;
+	};
+
+private:
+
+	GPCPolygon state;
+	float z;
+
+public:
+
+	GPCPolygon2() : z(0) {
+		;
+	}
+
+	GPCPolygon2(float z) : z(z) {
+		;
+	}
+
+	void add(const Floorplan::Polygon2& poly) {
+		GPCPolygon cur;
+		toGPC(poly, cur);
+		gpc_polygon_clip(GPC_UNION, &state, &cur, &state);
+	}
+
+	void remove(const Floorplan::Polygon2& poly) {
+		GPCPolygon cur;
+		toGPC(poly, cur);
+		gpc_polygon_clip(GPC_DIFF, &state, &cur, &state);
+	}
+
+	std::vector<std::vector<Point3>> get() {
+
+		gpc_tristrip res;
+		res.num_strips = 0;
+		res.strip = nullptr;
+
+		//res.strip = (gpc_vertex_list*) malloc(1024);
+		gpc_polygon_to_tristrip(&state, &res);
+
+		std::vector<std::vector<Point3>> trias;
+
+		for (int i = 0; i < res.num_strips; ++i) {
+			gpc_vertex_list lst = res.strip[i];
+			for (int j = 2; j < lst.num_vertices; ++j) {
+				std::vector<Point3> tria;
+				gpc_vertex& v1 = lst.vertex[j - 2];
+				gpc_vertex& v2 = lst.vertex[j - 1];
+				gpc_vertex& v3 = lst.vertex[j];
+				tria.push_back(Point3(v1.x, v1.y, z));
+				tria.push_back(Point3(v2.x, v2.y, z));
+				tria.push_back(Point3(v3.x, v3.y, z));
+				trias.push_back(tria);
+			}
+
+		}
+
+		gpc_free_tristrip(&res);
+
+		return std::move(trias);
+
+	}
+
+	std::vector<std::vector<Point3>> get(float z) {
+
+		gpc_tristrip res;
+		res.num_strips = 0;
+		res.strip = nullptr;
+
+		//res.strip = (gpc_vertex_list*) malloc(1024);
+		gpc_polygon_to_tristrip(&state, &res);
+
+		std::vector<std::vector<Point3>> trias;
+
+		for (int i = 0; i < res.num_strips; ++i) {
+			gpc_vertex_list lst = res.strip[i];
+			std::vector<Point3> tria;
+			for (int j = 0; j < lst.num_vertices; ++j) {
+				gpc_vertex& vert = lst.vertex[j];
+				Point3 p3(vert.x, vert.y, z);
+				tria.push_back(p3);
+			}
+			trias.push_back(tria);
+		}
+
+		gpc_free_tristrip(&res);
+
+		return std::move(trias);
+
+	}
+
+private:
+
+	void toGPC(Floorplan::Polygon2 poly, GPCPolygon& result) {
+
+		std::vector<gpc_vertex> verts;
+		for (Point2 p2 : poly.points) {
+			gpc_vertex vert; vert.x = p2.x; vert.y = p2.y;
+			verts.push_back(vert);
+		}
+
+		gpc_vertex_list list;
+		list.num_vertices = verts.size();
+		list.vertex = verts.data();
+		gpc_add_contour(&result, &list, 0);
+
+	}
+
+};
+#endif