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author | Konstantin Käfer <mail@kkaefer.com> | 2014-07-17 14:32:35 -0700 |
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committer | Konstantin Käfer <mail@kkaefer.com> | 2014-07-17 14:32:35 -0700 |
commit | 68f595a32bc746d958490c91aa7e165048491c37 (patch) | |
tree | 5401d4b124ab4bd4eb04154f49f410ec872dc061 /src/style/function_properties.cpp | |
parent | d44742f11579c593642d12d03f3ed8c46c9bb056 (diff) | |
download | qtlocation-mapboxgl-68f595a32bc746d958490c91aa7e165048491c37.tar.gz |
consolidate functions to only use stops
refs mapbox/mapbox-gl-style-spec#96
Diffstat (limited to 'src/style/function_properties.cpp')
-rw-r--r-- | src/style/function_properties.cpp | 87 |
1 files changed, 24 insertions, 63 deletions
diff --git a/src/style/function_properties.cpp b/src/style/function_properties.cpp index 2b378fb6b9..879de84f85 100644 --- a/src/style/function_properties.cpp +++ b/src/style/function_properties.cpp @@ -6,82 +6,36 @@ namespace mbgl { -template <> -bool LinearFunction<bool>::evaluate(float z) const { - return z < z_base ? slope >= 0 : z > z_base ? slope >= 0 : value; -} - -template <> -float LinearFunction<float>::evaluate(float z) const { - return std::fmin(std::fmax(min, value + (z - z_base) * slope), max); -} - -template <> -Color LinearFunction<Color>::evaluate(float z) const { - return {{ - std::fmin(std::fmax(min[0], value[0] + (z - z_base) * slope), max[0]), - std::fmin(std::fmax(min[1], value[1] + (z - z_base) * slope), max[1]), - std::fmin(std::fmax(min[2], value[2] + (z - z_base) * slope), max[2]), - std::fmin(std::fmax(min[3], value[3] + (z - z_base) * slope), max[3]) - }}; -} - - -template <> -bool ExponentialFunction<bool>::evaluate(float z) const { - return z < z_base ? slope >= 0 : z > z_base ? slope >= 0 : value; -} - -template <> -float ExponentialFunction<float>::evaluate(float z) const { - return std::fmin(std::fmax(min, value + std::pow(exp_base, (z - z_base)) * slope), max); -} - -template <> -Color ExponentialFunction<Color>::evaluate(float z) const { - return {{ - std::fmin(std::fmax(min[0], value[0] + float(std::pow(exp_base, (z - z_base))) * slope), max[0]), - std::fmin(std::fmax(min[1], value[1] + float(std::pow(exp_base, (z - z_base))) * slope), max[1]), - std::fmin(std::fmax(min[2], value[2] + float(std::pow(exp_base, (z - z_base))) * slope), max[2]), - std::fmin(std::fmax(min[3], value[3] + float(std::pow(exp_base, (z - z_base))) * slope), max[3]) - }}; -} - template <typename T> -inline T exponentialInterpolate(T smaller, T larger, const float factor); +inline T interpolate(T smaller, T larger, const float factor); template <> -inline float exponentialInterpolate(const float smaller, const float larger, const float factor) { - // Linear interpolation if base is 0 - if (smaller == 0.0f) { - return factor * larger; - } - // Exponential interpolation between the values - return smaller * std::pow(larger / smaller, factor); +inline float interpolate(const float smaller, const float larger, const float factor) { + return (smaller * (1 - factor)) + (larger * factor); } template <> -inline bool exponentialInterpolate(const bool smaller, const bool larger, const float factor) { - return exponentialInterpolate(float(smaller), float(larger), factor); +inline bool interpolate(const bool smaller, const bool larger, const float factor) { + return interpolate(float(smaller), float(larger), factor); } template <> -inline Color exponentialInterpolate(const Color smaller, const Color larger, const float factor) { +inline Color interpolate(const Color smaller, const Color larger, const float factor) { return {{ - exponentialInterpolate(smaller[0], larger[0], factor), - exponentialInterpolate(smaller[1], larger[1], factor), - exponentialInterpolate(smaller[2], larger[2], factor), - exponentialInterpolate(smaller[3], larger[3], factor) + interpolate(smaller[0], larger[0], factor), + interpolate(smaller[1], larger[1], factor), + interpolate(smaller[2], larger[2], factor), + interpolate(smaller[3], larger[3], factor) }}; } template <typename T> -T exponentialDefault(); +inline T defaultStopsValue(); -template <> bool exponentialDefault() { return true; } -template <> float exponentialDefault() { return 1.0f; } -template <> Color exponentialDefault() { return {{ 0, 0, 0, 1 }}; } +template <> inline bool defaultStopsValue() { return true; } +template <> inline float defaultStopsValue() { return 1.0f; } +template <> inline Color defaultStopsValue() { return {{ 0, 0, 0, 1 }}; } template <typename T> @@ -112,15 +66,22 @@ T StopsFunction<T>::evaluate(float z) const { if (larger_z == smaller_z || larger_val == smaller_val) { return smaller_val; } - float factor = (z - smaller_z) / (larger_z - smaller_z); - return exponentialInterpolate<T>(smaller_val, larger_val, factor); + const float zoomDiff = larger_z - smaller_z; + const float zoomProgress = z - smaller_z; + if (base == 1.0f) { + const float t = zoomProgress / zoomDiff; + return interpolate<T>(smaller_val, larger_val, t); + } else { + const float t = (std::pow(base, zoomProgress) - 1) / (std::pow(base, zoomDiff) - 1); + return interpolate<T>(smaller_val, larger_val, t); + } } else if (larger) { return larger_val; } else if (smaller) { return smaller_val; } else { // No stop defined. - return exponentialDefault<T>(); + return defaultStopsValue<T>(); } } |