1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
|
#include <mbgl/style/function_evaluator.hpp>
#include <mbgl/style/style_calculation_parameters.hpp>
#include <mbgl/style/types.hpp>
#include <mbgl/util/interpolate.hpp>
#include <mbgl/util/chrono.hpp>
#include <cmath>
namespace mbgl {
template <typename T>
inline T defaultStopsValue();
template <> inline bool defaultStopsValue() { return true; }
template <> inline float defaultStopsValue() { return 1.0f; }
template <> inline Color defaultStopsValue() { return {{ 0, 0, 0, 1 }}; }
template <> inline std::vector<float> defaultStopsValue() { return {{ 1, 0 }}; }
template <> inline std::vector<std::string> defaultStopsValue() { return {{}}; }
template <> inline std::array<float, 2> defaultStopsValue() { return {{ 0, 0 }}; }
template <> inline std::string defaultStopsValue() { return {}; }
template <> inline TranslateAnchorType defaultStopsValue() { return {}; };
template <> inline RotateAnchorType defaultStopsValue() { return {}; };
template <> inline LineCapType defaultStopsValue() { return {}; };
template <> inline LineJoinType defaultStopsValue() { return {}; };
template <> inline SymbolPlacementType defaultStopsValue() { return {}; };
template <> inline TextAnchorType defaultStopsValue() { return {}; };
template <> inline TextJustifyType defaultStopsValue() { return {}; };
template <> inline TextTransformType defaultStopsValue() { return {}; };
template <> inline RotationAlignmentType defaultStopsValue() { return {}; };
template <typename T>
T NormalFunctionEvaluator<T>::operator()(const Function<T>& fn, const StyleCalculationParameters& parameters) const {
float base = fn.getBase();
const std::vector<std::pair<float, T>>& stops = fn.getStops();
float z = parameters.z;
bool smaller = false;
float smaller_z = 0.0f;
T smaller_val = T();
bool larger = false;
float larger_z = 0.0f;
T larger_val = T();
for (uint32_t i = 0; i < stops.size(); i++) {
float stop_z = stops[i].first;
T stop_val = stops[i].second;
if (stop_z <= z && (!smaller || smaller_z < stop_z)) {
smaller = true;
smaller_z = stop_z;
smaller_val = stop_val;
}
if (stop_z >= z && (!larger || larger_z > stop_z)) {
larger = true;
larger_z = stop_z;
larger_val = stop_val;
}
}
if (smaller && larger) {
if (larger_z == smaller_z || larger_val == smaller_val) {
return smaller_val;
}
const float zoomDiff = larger_z - smaller_z;
const float zoomProgress = z - smaller_z;
if (base == 1.0f) {
const float t = zoomProgress / zoomDiff;
return util::interpolate(smaller_val, larger_val, t);
} else {
const float t = (std::pow(base, zoomProgress) - 1) / (std::pow(base, zoomDiff) - 1);
return util::interpolate(smaller_val, larger_val, t);
}
} else if (larger) {
return larger_val;
} else if (smaller) {
return smaller_val;
} else {
// No stop defined.
return defaultStopsValue<T>();
}
}
template class NormalFunctionEvaluator<bool>;
template class NormalFunctionEvaluator<float>;
template class NormalFunctionEvaluator<Color>;
template class NormalFunctionEvaluator<std::vector<float>>;
template class NormalFunctionEvaluator<std::vector<std::string>>;
template class NormalFunctionEvaluator<std::array<float, 2>>;
template class NormalFunctionEvaluator<std::string>;
template class NormalFunctionEvaluator<TranslateAnchorType>;
template class NormalFunctionEvaluator<RotateAnchorType>;
template class NormalFunctionEvaluator<LineCapType>;
template class NormalFunctionEvaluator<LineJoinType>;
template class NormalFunctionEvaluator<SymbolPlacementType>;
template class NormalFunctionEvaluator<TextAnchorType>;
template class NormalFunctionEvaluator<TextJustifyType>;
template class NormalFunctionEvaluator<TextTransformType>;
template class NormalFunctionEvaluator<RotationAlignmentType>;
template <typename T>
inline size_t getBiggestStopLessThan(const std::vector<std::pair<float, T>>& stops, float z) {
for (uint32_t i = 0; i < stops.size(); i++) {
if (stops[i].first > z) {
return i == 0 ? i : i - 1;
}
}
return stops.size() - 1;
}
template <typename T>
Faded<T> CrossFadedFunctionEvaluator<T>::operator()(const Function<T>& fn, const StyleCalculationParameters& parameters) const {
Faded<T> result;
const std::vector<std::pair<float, T>>& stops = fn.getStops();
float z = parameters.z;
const float fraction = z - std::floor(z);
std::chrono::duration<float> d = parameters.defaultFadeDuration;
float t = std::min((parameters.now - parameters.zoomHistory.lastIntegerZoomTime) / d, 1.0f);
float fromScale = 1.0f;
float toScale = 1.0f;
size_t from, to;
if (z > parameters.zoomHistory.lastIntegerZoom) {
result.t = fraction + (1.0f - fraction) * t;
from = getBiggestStopLessThan(stops, z - 1.0f);
to = getBiggestStopLessThan(stops, z);
fromScale *= 2.0f;
} else {
result.t = 1 - (1 - t) * fraction;
to = getBiggestStopLessThan(stops, z);
from = getBiggestStopLessThan(stops, z + 1.0f);
fromScale /= 2.0f;
}
result.from = stops[from].second;
result.to = stops[to].second;
result.fromScale = fromScale;
result.toScale = toScale;
return result;
}
template class CrossFadedFunctionEvaluator<std::string>;
template class CrossFadedFunctionEvaluator<std::vector<float>>;
} // namespace mbgl
|
