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#pragma once
#include <mbgl/util/tile_cover.hpp>
#include <mbgl/util/geometry.hpp>
#include <mbgl/util/optional.hpp>
#include <vector>
#include <map>
#include <queue>
namespace mbgl {
class TransformState;
class LatLngBounds;
namespace util {
struct Bound;
using Bounds = std::vector<Bound>;
using BoundsMap = std::map<uint32_t, Bounds>;
// A chain of points from a local minimum to a local maximum. `winding` indicates
// the direction of the original geometry.
struct Bound {
std::vector<Point<double>> points;
size_t currentPoint = 0;
bool winding = false;
Bound() = default;
Bound(const Bound& rhs) {
points = rhs.points;
currentPoint = rhs.currentPoint;
winding = rhs.winding;
}
Bound& operator=(Bound&& rhs) {
points = std::move(rhs.points);
currentPoint = rhs.currentPoint;
winding = rhs.winding;
return *this;
}
// Compute the interpolated x coordinate at y for the current edge
double interpolate(uint32_t y) {
const auto& p0 = points[currentPoint];
const auto& p1 = points[currentPoint + 1];
const auto dx = p1.x - p0.x;
const auto dy = p1.y - p0.y;
auto x = p0.x;
if (dx == 0) {
return x;
} else if (dy == 0){
return y <= p0.y ? p0.x : p1.x;
}
if (y < p0.y) return x;
if (y > p1.y) return p1.x;
x = (dx / dy) * (y - p0.y) + p0.x;
return x;
}
};
class TileCover::Impl {
public:
Impl(int32_t z, const Geometry<double>& geom, bool project = true);
~Impl() = default;
optional<UnwrappedTileID> next();
bool hasNext() const;
private:
using TileSpans = std::queue<std::pair<int32_t, int32_t>>;
void nextRow();
const int32_t zoom;
bool isClosed;
BoundsMap boundsMap;
BoundsMap::iterator currentBounds;
// List of bounds that begin at or before `tileY`
Bounds activeBounds;
TileSpans tileXSpans;
uint32_t tileY;
int32_t tileX;
};
} // namespace util
} // namespace mbgl
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