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[core] Add support for "line within polygon"

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This commit is contained in:
zmiao
2020-02-17 17:30:30 +02:00
parent 44f9a694c5
commit 0cc042434d
2 changed files with 200 additions and 13 deletions
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12
include/mbgl/style/expression/within.hpp
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@@ -23,18 +23,12 @@ public:
void eachChild(const std::function<void(const Expression&)>&) const override {}
bool operator==(const Expression& e) const override {
if (e.getKind() == Kind::Within) {
auto rhs = static_cast<const Within*>(&e);
return geoJSONSource == rhs->geoJSONSource;
}
return false;
}
bool operator==(const Expression& e) const override;
std::vector<optional<Value>> possibleOutputs() const override { return {{true}, {false}}; }
std::vector<optional<Value>> possibleOutputs() const override;
mbgl::Value serialize() const override;
std::string getOperator() const override { return "within"; }
std::string getOperator() const override;
private:
GeoJSON geoJSONSource;

201
src/mbgl/style/expression/within.cpp
View File

@@ -4,6 +4,7 @@
#include <mapbox/geometry.hpp>
#include <mbgl/style/conversion_impl.hpp>
#include <mbgl/tile/geometry_tile_data.hpp>
#include <mbgl/util/logging.hpp>
#include <mbgl/util/string.hpp>
@@ -34,6 +35,25 @@ public:
}
};
void printPolygon(const Polygon<double>& polygon) {
mbgl::Log::Debug(mbgl::Event::General, "-------Print Polygon------");
for (auto ring : polygon) {
auto length = ring.size();
mbgl::Log::Debug(mbgl::Event::General, "-------Print New ring with size: %d ------", length);
// loop through every edge of the ring
for (std::size_t i = 0; i < length - 1; ++i) {
mbgl::Log::Debug(mbgl::Event::General, "point [%.15f, %.15f],", ring[i].x, ring[i].y);
}
}
}
void printLine(const LineString<double>& lineString) {
mbgl::Log::Debug(mbgl::Event::General, "-------Print LineString------");
for (std::size_t i = 0; i < lineString.size(); ++i) {
mbgl::Log::Debug(mbgl::Event::General, "point [%.15f, %.15f],", lineString[i].x, lineString[i].y);
}
}
bool rayIntersect(const mbgl::Point<double>& p, const mbgl::Point<double>& p1, const mbgl::Point<double>& p2) {
return ((p1.y > p.y) != (p2.y > p.y)) && (p.x < (p2.x - p1.x) * (p.y - p1.y) / (p2.y - p1.y) + p1.x);
}
@@ -42,9 +62,9 @@ bool rayIntersect(const mbgl::Point<double>& p, const mbgl::Point<double>& p1, c
bool pointWithinPolygon(const mbgl::Point<double>& point, const mapbox::geometry::polygon<double>& polygon) {
bool within = false;
for (auto ring : polygon) {
auto size = ring.size();
auto length = ring.size();
// loop through every edge of the ring
for (std::size_t i = 0; i < size - 1; ++i) {
for (std::size_t i = 0; i < length - 1; ++i) {
if (rayIntersect(point, ring[i], ring[i + 1])) {
within = !within;
}
@@ -60,12 +80,97 @@ bool pointWithinPolygons(const mbgl::Point<double>& point, const mapbox::geometr
return false;
}
bool lineIntersectLine(const mbgl::Point<double>& p1,
const mbgl::Point<double>& p2,
const mbgl::Point<double>& q1,
const mbgl::Point<double>& q2) {
// precondition is p1, p2 is inside polygon, so p1, p2 is not on line q1->q2
const auto perp = [](const mbgl::Point<double>& v1, const mbgl::Point<double>& v2) {
return (v1.x * v2.y - v1.y * v2.x);
};
// check if p1 and p2 are in different sides of line segment q1->q2
const auto twoSided = [](const mbgl::Point<double>& p1,
const mbgl::Point<double>& p2,
const mbgl::Point<double>& q1,
const mbgl::Point<double>& q2) {
double x1, y1, x2, y2, x3, y3;
// q1->p1 (x1, y1), q1->p2 (x2, y2), q1->q2 (x3, y3)
x1 = p1.x - q1.x;
y1 = p1.y - q1.y;
x2 = p2.x - q1.x;
y2 = p2.y - q1.y;
x3 = q2.x - q1.x;
y3 = q2.y - q1.y;
if ((x1 * y3 - x3 * y1) * (x2 * y3 - x3 * y2) < 0) return true;
return false;
};
auto vectorP = mbgl::Point<double>(p2.x - p1.x, p2.y - p1.y);
auto vectorQ = mbgl::Point<double>(q2.x - q1.x, q2.y - q1.y);
// check if two segments are parallel or not
if (perp(vectorQ, vectorP) == 0) return false;
// check if there are intersecting with each other
// p1 and p2 lie in separate side of segment q1->q2
// q1 and q2 lie in separate side of segment p1->p2
if (twoSided(p1, p2, q1, q2) && twoSided(q1, q2, p1, p2)) return true;
return false;
}
bool lineIntersectPolygon(const mbgl::Point<double>& p1,
const mbgl::Point<double>& p2,
const mapbox::geometry::polygon<double>& polygon) {
for (auto ring : polygon) {
auto length = ring.size();
// loop through every edge of the ring
for (std::size_t i = 0; i < length - 1; ++i) {
if (lineIntersectLine(p1, p2, ring[i], ring[i + 1])) {
// mbgl::Log::Debug(mbgl::Event::General,
// "intersecting with edge from %.15f to %.15f", i, i+ 1);
return true;
}
}
}
return false;
}
bool lineStringWithinPolygon(const mbgl::LineString<double>& lineString,
const mapbox::geometry::polygon<double>& polygon) {
// First, check if endpoints of line are all inside polygon
for (std::size_t i = 0; i < lineString.size() - 1; ++i) {
if (!pointWithinPolygon(lineString[i], polygon)) {
mbgl::Log::Debug(
mbgl::Event::General, "point %.15f, %.15f is not inside polygon", lineString[i].x, lineString[i].y);
return false;
}
}
// Second, check if there was line segment intersecting polygon edge
for (std::size_t i = 0; i < lineString.size() - 1; ++i) {
if (lineIntersectPolygon(lineString[i], lineString[i + 1], polygon)) {
mbgl::Log::Debug(mbgl::Event::General,
"---------line [%.15f, %.15f] to [%.15f, %.15f] is not inside polygon",
lineString[i].x,
lineString[i].y,
lineString[i + 1].x,
lineString[i + 1].y);
return false;
}
}
mbgl::Log::Debug(mbgl::Event::General, "---------line is inside polygon, line point size: %d: ", lineString.size());
return true;
}
bool pointsWithinPolygons(const mbgl::GeometryTileFeature& feature,
const mbgl::CanonicalTileID& canonical,
const mbgl::GeoJSON& geoJson) {
return geoJson.match(
[&feature, &canonical](const mapbox::geometry::geometry<double>& geometrySet) -> bool {
mbgl::Feature f(geometrySet);
PolygonFeature polyFeature(f, canonical);
auto refinedGeoSet = convertGeometry(polyFeature, canonical);
return refinedGeoSet.match(
@@ -80,7 +185,9 @@ bool pointsWithinPolygons(const mbgl::GeometryTileFeature& feature,
return pointWithinPolygons(p, polygons);
});
},
[](const auto&) -> bool { return false; });
[](const auto&) -> bool {
return false;
});
},
[&feature, &canonical](const mapbox::geometry::polygon<double>& polygon) -> bool {
return convertGeometry(feature, canonical)
@@ -100,6 +207,73 @@ bool pointsWithinPolygons(const mbgl::GeometryTileFeature& feature,
[](const auto&) -> bool { return false; });
}
bool lineStringWithinPolygons(const mbgl::LineString<double>& line, const MultiPolygon<double>& polygons) {
for (auto polygon : polygons) {
if (lineStringWithinPolygon(line, polygon)) return true;
}
return false;
}
bool linesWithinPolygons(const mbgl::GeometryTileFeature& feature,
const mbgl::CanonicalTileID& canonical,
const mbgl::GeoJSON& geoJson) {
mbgl::Log::Debug(mbgl::Event::General, "------------------------Canonical ID is-------------------------------");
mbgl::Log::Debug(
mbgl::Event::General, "----- '%d' / '%d' / '%d'-------------", canonical.z, canonical.x, canonical.y);
return geoJson.match(
[&feature, &canonical](const mapbox::geometry::geometry<double>& geometrySet) -> bool {
mbgl::Feature f(geometrySet);
PolygonFeature polyFeature(f, CanonicalTileID(0, 0, 0));
auto refinedGeoSet = convertGeometry(polyFeature, CanonicalTileID(0, 0, 0));
return refinedGeoSet.match(
[&feature, &canonical](const MultiPolygon<double>& polygons) -> bool {
for (auto polygon : polygons) {
printPolygon(polygon);
}
return convertGeometry(feature, canonical)
.match(
[&polygons](const LineString<double>& line) -> bool {
printLine(line);
return lineStringWithinPolygons(line, polygons);
},
[&polygons](const MultiLineString<double>& lines) -> bool {
return std::all_of(lines.begin(), lines.end(), [&polygons](const auto& line) {
printLine(line);
return lineStringWithinPolygons(line, polygons);
});
},
[](const auto&) -> bool {
return false;
});
},
[&feature, &canonical](const Polygon<double>& polygon) -> bool {
printPolygon(polygon);
return convertGeometry(feature, canonical)
.match(
[&polygon](const LineString<double>& line) -> bool {
printLine(line);
return lineStringWithinPolygon(line, polygon);
},
[&polygon](const MultiLineString<double>& lines) -> bool {
return std::all_of(lines.begin(), lines.end(), [&polygon](const auto& line) {
printLine(line);
return lineStringWithinPolygon(line, polygon);
});
},
[](const auto&) -> bool {
return false;
});
},
[](const auto&) -> bool {
return false;
});
},
[](const auto&) -> bool {
return false;
});
}
mbgl::optional<mbgl::GeoJSON> parseValue(const mbgl::style::conversion::Convertible& value_,
mbgl::style::expression::ParsingContext& ctx) {
if (isObject(value_)) {
@@ -138,7 +312,10 @@ EvaluationResult Within::evaluate(const EvaluationContext& params) const {
auto geometryType = params.feature->getType();
// Currently only support Point/Points in Polygon/Polygons
if (geometryType == FeatureType::Point) {
return pointsWithinPolygons(*params.feature, *params.canonical, geoJSONSource);
pointsWithinPolygons(*params.feature, *params.canonical, geoJSONSource);
return true;
} else if (geometryType == FeatureType::LineString) {
return linesWithinPolygons(*params.feature, *params.canonical, geoJSONSource);
}
mbgl::Log::Warning(mbgl::Event::General, "within expression currently only support 'Point' geometry type");
@@ -197,6 +374,22 @@ mbgl::Value Within::serialize() const {
return std::vector<mbgl::Value>{{getOperator(), *fromExpressionValue<mbgl::Value>(serialized)}};
}
bool Within::operator==(const Expression& e) const {
if (e.getKind() == Kind::Within) {
auto rhs = static_cast<const Within*>(&e);
return geoJSONSource == rhs->geoJSONSource;
}
return false;
}
std::vector<optional<Value>> Within::possibleOutputs() const {
return {{true}, {false}};
}
std::string Within::getOperator() const {
return "within";
}
} // namespace expression
} // namespace style
} // namespace mbgl