1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
#ifndef TILE_COORDINATES_SET_H
#define TILE_COORDINATES_SET_H
#include <cstddef>
#include "coordinates.h"
// Interface representing a bitmap of tiles of interest at a given zoom.
class TileCoordinatesSet {
public:
virtual bool test(TileCoordinate x, TileCoordinate y) const = 0;
virtual void set(TileCoordinate x, TileCoordinate y) = 0;
virtual size_t size() const = 0;
virtual size_t zoom() const = 0;
};
// Read-write implementation for precise sets; maximum zoom is
// generally expected to be z14.
class PreciseTileCoordinatesSet : public TileCoordinatesSet {
public:
PreciseTileCoordinatesSet(unsigned int zoom);
bool test(TileCoordinate x, TileCoordinate y) const override;
size_t size() const override;
size_t zoom() const override;
void set(TileCoordinate x, TileCoordinate y) override;
private:
unsigned int zoom_;
std::vector<bool> tiles;
};
// Read-only implementation for a lossy set. Used when zoom is
// z15 or higher, extrapolates a result based on a set for a lower zoom.
class LossyTileCoordinatesSet : public TileCoordinatesSet {
public:
LossyTileCoordinatesSet(unsigned int zoom, const TileCoordinatesSet& precise);
bool test(TileCoordinate x, TileCoordinate y) const override;
size_t size() const override;
size_t zoom() const override;
void set(TileCoordinate x, TileCoordinate y) override;
private:
unsigned int zoom_;
const TileCoordinatesSet& tiles;
unsigned int scale;
};
#endif
|
