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#include <mbgl/util/interpolate.hpp>
#include <cmath>
namespace mbgl {
namespace util {
float interpolationFactor(float base, Range<float> range, float z) {
const float zoomDiff = range.max - range.min;
const float zoomProgress = z - range.min;
if (zoomDiff == 0) {
return 0;
} else if (base == 1.0f) {
return zoomProgress / zoomDiff;
} else {
return (std::pow(base, zoomProgress) - 1) / (std::pow(base, zoomDiff) - 1);
}
}
} // namespace util
} // namespace mbgl
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