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#pragma once
#include <mbgl/util/chrono.hpp>
#include <cmath>
namespace mbgl {
struct ZoomHistory {
float lastZoom;
float lastFloorZoom;
float lastIntegerZoom;
TimePoint lastIntegerZoomTime;
bool first = true;
bool update(float z, const TimePoint& now) {
constexpr TimePoint zero = TimePoint(Duration::zero());
const float floorZ = std::floor(z);
if (first) {
first = false;
lastIntegerZoom = floorZ;
lastIntegerZoomTime = zero;
lastZoom = z;
lastFloorZoom = floorZ;
return true;
}
if (lastFloorZoom > floorZ) {
lastIntegerZoom = floorZ + 1;
lastIntegerZoomTime = now == Clock::time_point::max() ? zero : now;
} else if (lastFloorZoom < floorZ) {
lastIntegerZoom = floorZ;
lastIntegerZoomTime = now == Clock::time_point::max() ? zero : now;
}
if (z != lastZoom) {
lastZoom = z;
lastFloorZoom = floorZ;
return true;
}
return false;
}
};
} // namespace mbgl
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