src/lib/gpc.hpp

//
// AutoCoast: Automatic Coastline scenery generator for Flight Simulator
//
// Copyright (c) 2004, Takuya Murakami. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
//    notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
//    documentation and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// GPC wrapper class

#ifndef _GPC_HPP
#define _GPC_HPP

#include <vector>
using namespace std;

#include "common.hpp"

extern "C" {
#include "gpc.h"
}

#include "bbox.hpp"

class GpcVertexList
{
protected:
        gpc_vertex_list *vlist;
        bool ownVlistMemory;

        inline void check(void) {
                ASSERT(vlist != NULL);
        }
        inline void checkn(int n) {
                ASSERT(vlist != NULL);
                ASSERT(0 <= n && n < vlist->num_vertices);
        }

public:
        GpcVertexList(void);
        GpcVertexList(int n, gpc_vertex *vertex);
        GpcVertexList(gpc_vertex_list *v);
        ~GpcVertexList();

        inline int numVertices(void) { check(); return vlist->num_vertices; }
        inline gpc_vertex *vertex(int n) { checkn(n); return &vlist->vertex[n]; }
        inline double vx(int n) { checkn(n); return vlist->vertex[n].x; }
        inline double vy(int n) { checkn(n); return vlist->vertex[n].y; }

        void modifyStartPointFromEdge(BoundingBox &bbox);
        void invert(void);
        bool isLeftHand(void);
        void smoothing(void);
        void crop(BoundingBox &bbox);

        /* internal use... */
        inline gpc_vertex_list *getvlist(void) { return vlist; }
};

class GpcPolygon
{
protected:
        gpc_polygon             polygon;
        vector<GpcVertexList*>  contour;

public:
        GpcPolygon();
        ~GpcPolygon();
        void clear(void);

        void LoadFromFile(const char *fname);
        void SaveToFile(const char *fname);
        void AddVertexList(GpcVertexList *list, bool rebuild=true);
        void BuildVertexListFromGpcPolygon(void);
        GpcPolygon *Clipping(BoundingBox &bbox);

        bool isEmpty(void);
        bool isFull(BoundingBox &bbox);

        inline int numVList(void) { return contour.size(); }
        inline GpcVertexList *getVList(int n) { return contour.at(n); }

        void Smoothing(void);
        void Crop(BoundingBox &bbox);

        void printStat(void);

        /* internal use... */
        inline gpc_polygon *getpolygon(void) { return &polygon; }
};

#endif