92 lines
2.7 KiB
C++
92 lines
2.7 KiB
C++
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//
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// PLANEMAP
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//
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// Stores a map of the items that are on each plane. Doesn't
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// store terrain, only items.
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//
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// A plane is a rectangle, with a finite size: if you stray more
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// than 80,000,000 meters from the origin, then you are beyond the
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// edge of the plane.
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//
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// There's nothing stopping you from moving a PlaneItem farther
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// than that. However, if you do move a PlaneItem farther than
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// that, then it won't show up in radius-scans.
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//
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// The PlaneMap doesn't need you to "create" planes. You just
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// set the plane of a PlaneItem to any string, and that plane will
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// pop into existence if it wasn't already there.
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//
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// If you use the empty string as a plane name, a special case is
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// triggered: you're "nowhere." Radius scans can never find items
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// whose plane is the empty string.
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//
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// INHERITANCE
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//
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// The intent is that class Sprite should derive from PlaneItem.
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// When you put sprites into a PlaneMap, it will work fine. However,
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// when you scan the PlaneMap, it will give you PlaneItem pointers,
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// not Sprite pointers. If you're sure that the PlaneMap contains
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// only sprites, then you can use static_cast to convert those
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// PlaneItem pointers to Sprite pointers. Sadly, there's no simple
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// way to avoid the casting.
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//
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// MEMORY MANAGEMENT
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//
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// The PlaneMap does not own the PlaneItems. You need to create,
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// destroy, and manage the PlaneItems yourself.
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//
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#ifndef PLANEMAP_HPP
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#define PLANEMAP_HPP
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#include <cstdint>
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#include <vector>
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#include <map>
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class PlaneMap;
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class PlaneItem {
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friend class PlaneMap;
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private:
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PlaneMap *grid_;
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std::string plane_;
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double x_, y_, z_;
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public:
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PlaneItem();
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~PlaneItem();
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const std::string &plane() const { return plane_; }
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const double x() const { return x_; }
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const double y() const { return y_; }
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const double z() const { return z_; }
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void use_map(PlaneMap *map);
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void set_pos(const std::string &plane, double x, double y, double z);
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};
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class PlaneMap {
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friend class PlaneItem;
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friend int cunittests_planemap(lua_State *L);
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public:
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using Elt = PlaneItem *;
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using EltVec = std::vector<Elt>;
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private:
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using Plane = std::map<int64_t, EltVec>;
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std::map<std::string, Plane> planes_;
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void remove(const std::string &plane, int64_t cell, PlaneItem *client);
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void insert(const std::string &plane, int64_t cell, PlaneItem *client);
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private:
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// These functions are only used in unit tests.
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EltVec get_cell(const std::string &plane, int64_t cell) const;
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int total_cells() const;
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void clear() { planes_.clear(); }
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public:
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PlaneMap();
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~PlaneMap();
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EltVec scan_radius(const std::string &plane, double x, double y, double radius) const;
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};
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#endif // PLANEMAP_HPP
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