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#pragma once
#include <mbgl/map/zoom_history.hpp>
#include <mbgl/util/chrono.hpp>
namespace mbgl {
class CrossfadeParameters {
public:
float fromScale;
float toScale;
float t;
};
class PropertyEvaluationParameters {
public:
explicit PropertyEvaluationParameters(float z_)
: z(z_),
now(Clock::time_point::max()),
defaultFadeDuration(0) {}
PropertyEvaluationParameters(ZoomHistory zoomHistory_, TimePoint now_, Duration defaultFadeDuration_)
: z(zoomHistory_.lastZoom), now(now_), zoomHistory(zoomHistory_), defaultFadeDuration(defaultFadeDuration_) {}
CrossfadeParameters getCrossfadeParameters() const {
const float fraction = z - std::floor(z);
const std::chrono::duration<float> d = defaultFadeDuration;
const float t = d != std::chrono::duration<float>::zero()
? std::min((now - zoomHistory.lastIntegerZoomTime) / d, 1.0f)
: 1.0f;
return z > zoomHistory.lastIntegerZoom
? CrossfadeParameters { 2.0f, 1.0f, fraction + (1.0f - fraction) * t }
: CrossfadeParameters { 0.5f, 1.0f, 1 - (1 - t) * fraction };
}
float z;
TimePoint now;
ZoomHistory zoomHistory;
Duration defaultFadeDuration;
};
} // namespace mbgl
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