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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
#include <mbgl/layout/symbol_projection.hpp>
#include <mbgl/map/transform_state.hpp>
#include <mbgl/renderer/render_tile.hpp>
#include <mbgl/renderer/buckets/symbol_bucket.hpp>
#include <mbgl/renderer/layers/render_symbol_layer.hpp>
#include <mbgl/util/optional.hpp>
#include <mbgl/util/math.hpp>
namespace mbgl {
mat4 getLabelPlaneMatrix(const mat4& posMatrix, const bool pitchWithMap, const bool rotateWithMap, const TransformState& state, const float pixelsToTileUnits) {
mat4 m;
matrix::identity(m);
if (pitchWithMap) {
matrix::scale(m, m, 1 / pixelsToTileUnits, 1 / pixelsToTileUnits, 1);
if (!rotateWithMap) {
matrix::rotate_z(m, m, state.getAngle());
}
} else {
matrix::scale(m, m, state.getSize().width / 2.0, -state.getSize().height / 2.0, 1.0);
matrix::translate(m, m, 1, -1, 0);
matrix::multiply(m, m, posMatrix);
}
return m;
}
mat4 getGlCoordMatrix(const mat4& posMatrix, const bool pitchWithMap, const bool rotateWithMap, const TransformState& state, const float pixelsToTileUnits) {
mat4 m;
matrix::identity(m);
if (pitchWithMap) {
matrix::multiply(m, m, posMatrix);
matrix::scale(m, m, pixelsToTileUnits, pixelsToTileUnits, 1);
if (!rotateWithMap) {
matrix::rotate_z(m, m, -state.getAngle());
}
} else {
matrix::scale(m, m, 1, -1, 1);
matrix::translate(m, m, -1, -1, 0);
matrix::scale(m, m, 2.0 / state.getSize().width, 2.0 / state.getSize().height, 1.0);
}
return m;
}
Point<float> project(const Point<float>& point, const mat4& matrix) {
vec4 pos = {{ point.x, point.y, 0, 1 }};
matrix::transformMat4(pos, pos, matrix);
return { static_cast<float>(pos[0] / pos[3]), static_cast<float>(pos[1] / pos[3]) };
}
bool isVisible(const vec4& anchorPos, const float, const std::array<double, 2>& clippingBuffer) {
const float x = anchorPos[0] / anchorPos[3];
const float y = anchorPos[1] / anchorPos[3];
const bool inPaddedViewport = (
x >= -clippingBuffer[0] &&
x <= clippingBuffer[0] &&
y >= -clippingBuffer[1] &&
y <= clippingBuffer[1]);
// TODO do framehistory check here as well
return inPaddedViewport;
}
void addDynamicAttributes(const Point<float>& anchorPoint, const float angle, const float placementZoom,
gl::VertexVector<SymbolDynamicLayoutAttributes::Vertex>& dynamicVertexArray) {
auto dynamicVertex = SymbolDynamicLayoutAttributes::vertex(anchorPoint, angle, placementZoom);
dynamicVertexArray.emplace_back(dynamicVertex);
dynamicVertexArray.emplace_back(dynamicVertex);
dynamicVertexArray.emplace_back(dynamicVertex);
dynamicVertexArray.emplace_back(dynamicVertex);
}
void hideGlyphs(size_t numGlyphs, gl::VertexVector<SymbolDynamicLayoutAttributes::Vertex>& dynamicVertexArray) {
const Point<float> offscreenPoint = { -INFINITY, -INFINITY };
for (size_t i = 0; i < numGlyphs; i++) {
addDynamicAttributes(offscreenPoint, 0, 25, dynamicVertexArray);
}
}
struct PlacedGlyph {
PlacedGlyph(Point<float> point_, float angle_) : point(point_), angle(angle_) {}
Point<float> point;
float angle;
};
optional<PlacedGlyph> placeGlyphAlongLine(const float offsetX, const float lineOffsetX, const float lineOffsetY, const bool flip,
Point<float> anchorPoint, const uint16_t anchorSegment, const std::vector<Point<float>>& line, const mat4& labelPlaneMatrix) {
const float combinedOffsetX = flip ?
offsetX - lineOffsetX :
offsetX + lineOffsetX;
int16_t dir = combinedOffsetX > 0 ? 1 : -1;
float angle = 0.0;
if (flip) {
// The label needs to be flipped to keep text upright.
// Iterate in the reverse direction.
dir *= -1;
angle = M_PI;
}
if (dir < 0) angle += M_PI;
int32_t currentIndex = dir > 0 ? anchorSegment : anchorSegment + 1;
Point<float>& current = anchorPoint;
Point<float>& prev = anchorPoint;
float distanceToPrev = 0.0;
float currentSegmentDistance = 0.0;
const float absOffsetX = std::abs(combinedOffsetX);
while (distanceToPrev + currentSegmentDistance <= absOffsetX) {
currentIndex += dir;
// offset does not fit on the projected line
if (currentIndex < 0 || currentIndex >= static_cast<int32_t>(line.size())) return {};
prev = current;
current = project(line.at(currentIndex), labelPlaneMatrix);
distanceToPrev += currentSegmentDistance;
currentSegmentDistance = util::dist<float>(prev, current);
}
// The point is on the current segment. Interpolate to find it.
const float segmentInterpolationT = (absOffsetX - distanceToPrev) / currentSegmentDistance;
const Point<float> prevToCurrent = current - prev;
Point<float> p = (prevToCurrent * segmentInterpolationT) + prev;
// offset the point from the line to text-offset and icon-offset
p += util::perp(prevToCurrent) * static_cast<float>(lineOffsetY * dir / util::mag(prevToCurrent));
const float segmentAngle = angle + std::atan2(current.y - prev.y, current.x - prev.x);
return {{ p, segmentAngle }};
}
void placeGlyphsAlongLine(const PlacedSymbol& symbol, const float fontSize, const bool flip, const mat4& labelPlaneMatrix,
gl::VertexVector<SymbolDynamicLayoutAttributes::Vertex>& dynamicVertexArray) {
const float fontScale = fontSize / 24.0;
const float lineOffsetX = symbol.lineOffsetX * fontSize;
const float lineOffsetY = symbol.lineOffsetY * fontSize;
const Point<float> anchorPoint = project(symbol.anchorPoint, labelPlaneMatrix);
std::vector<PlacedGlyph> placedGlyphs;
for (auto glyphOffsetX : symbol.glyphOffsets) {
auto placedGlyph = placeGlyphAlongLine(glyphOffsetX * fontScale, lineOffsetX, lineOffsetY, flip, anchorPoint, symbol.segment, symbol.line, labelPlaneMatrix);
if (placedGlyph) {
placedGlyphs.push_back(*placedGlyph);
} else {
hideGlyphs(symbol.glyphOffsets.size(), dynamicVertexArray);
return;
}
}
for (auto& placedGlyph : placedGlyphs) {
addDynamicAttributes(placedGlyph.point, placedGlyph.angle, symbol.placementZoom, dynamicVertexArray);
}
}
void reprojectLineLabels(SymbolBucket& bucket, const mat4& posMatrix, const bool isText, const style::SymbolPropertyValues& values,
//const RenderTile& tile, const TransformState& state) {
const RenderTile&, const TransformState& state) {
// const sizeData = isText ? bucket.textSizeData : bucket.iconSizeData;
// const partiallyEvaluatedSize = symbolSize.evaluateSizeForZoom(sizeData, painter.transform, layer, isText);
const std::array<double, 2> clippingBuffer = {{ 256.0 / state.getSize().width * 2.0 + 1.0, 256.0 / state.getSize().height }};
//TODO
const float pixelsToTileUnits = 1.0;
const mat4 labelPlaneMatrix = getLabelPlaneMatrix(posMatrix, values.pitchAlignment == style::AlignmentType::Map,
values.rotationAlignment == style::AlignmentType::Map, state, pixelsToTileUnits);
gl::VertexVector<SymbolDynamicLayoutAttributes::Vertex>& dynamicVertexArray = isText ?
bucket.text.dynamicVertices :
bucket.icon.dynamicVertices;
dynamicVertexArray.clear();
const std::vector<PlacedSymbol>& placedSymbols = isText ? bucket.text.placedSymbols : bucket.icon.placedSymbols;
for (auto& placedSymbol : placedSymbols) {
vec4 anchorPos = {{ placedSymbol.anchorPoint.x, placedSymbol.anchorPoint.y, 0, 1 }};
matrix::transformMat4(anchorPos, anchorPos, posMatrix);
// Don't bother calculating the correct point for invisible labels.
if (!isVisible(anchorPos, placedSymbol.placementZoom, clippingBuffer)) {
hideGlyphs(placedSymbol.glyphOffsets.size(), dynamicVertexArray);
continue;
}
bool flip = false;
if (values.keepUpright) {
if (false) {
const Point<float> a = project(placedSymbol.line.at(placedSymbol.segment), posMatrix);
const Point<float> b = project(placedSymbol.line.at(placedSymbol.segment + 1), posMatrix);
flip = placedSymbol.vertical ? b.y > a.y : b.x < a.x;
}
}
const float cameraToAnchorDistance = anchorPos[3];
const float perspectiveRatio = 1 + 0.5 * ((cameraToAnchorDistance / state.getCameraToCenterDistance()) - 1.0);
//const fontSize = symbolSize.evaluateSizeForFeature(sizeData, partiallyEvaluatedSize, symbol);
const float fontSize = 16;
const float pitchScaledFontSize = values.pitchAlignment == style::AlignmentType::Map ?
fontSize * perspectiveRatio :
fontSize / perspectiveRatio;
placeGlyphsAlongLine(placedSymbol, pitchScaledFontSize, flip, labelPlaneMatrix, dynamicVertexArray);
}
}
} // end namespace mbgl
|
