blob: 02750c7d2e6503620a3db937296207d0d0815363 (
plain)
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
|
#include <mbgl/style/function.hpp>
#include <mbgl/style/types.hpp>
#include <mbgl/util/color.hpp>
#include <mbgl/util/interpolate.hpp>
#include <cmath>
namespace mbgl {
namespace style {
template <typename T>
T Function<T>::evaluate(float z) const {
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.
assert(false);
return T();
}
}
template class Function<bool>;
template class Function<float>;
template class Function<Color>;
template class Function<std::vector<float>>;
template class Function<std::vector<std::string>>;
template class Function<std::array<float, 2>>;
template class Function<std::array<float, 4>>;
template class Function<std::string>;
template class Function<TranslateAnchorType>;
template class Function<RotateAnchorType>;
template class Function<CirclePitchScaleType>;
template class Function<LineCapType>;
template class Function<LineJoinType>;
template class Function<SymbolPlacementType>;
template class Function<TextAnchorType>;
template class Function<TextJustifyType>;
template class Function<TextTransformType>;
template class Function<AlignmentType>;
template class Function<IconTextFitType>;
} // namespace style
} // namespace mbgl
|
