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#include <mbgl/style/layers/line_layer_impl.hpp>
#include <mbgl/style/bucket_parameters.hpp>
#include <mbgl/renderer/line_bucket.hpp>
#include <mbgl/geometry/feature_index.hpp>
#include <mbgl/util/math.hpp>
#include <mbgl/util/intersection_tests.hpp>
namespace mbgl {
namespace style {
void LineLayer::Impl::parseLayout(const JSValue& value) {
layout.parse(value);
}
void LineLayer::Impl::parsePaints(const JSValue& layer) {
paint.parse(layer);
}
void LineLayer::Impl::cascade(const CascadeParameters& parameters) {
paint.cascade(parameters);
}
bool LineLayer::Impl::recalculate(const CalculationParameters& parameters) {
// for scaling dasharrays
CalculationParameters dashArrayParams = parameters;
dashArrayParams.z = std::floor(dashArrayParams.z);
paint.lineWidth.calculate(dashArrayParams);
dashLineWidth = paint.lineWidth;
bool hasTransitions = paint.recalculate(parameters);
passes = (paint.lineOpacity > 0 && paint.lineColor.value.a > 0 && paint.lineWidth > 0)
? RenderPass::Translucent : RenderPass::None;
return hasTransitions;
}
std::unique_ptr<Bucket> LineLayer::Impl::createBucket(BucketParameters& parameters) const {
auto bucket = std::make_unique<LineBucket>(parameters.tileID.overscaleFactor());
bucket->layout = layout;
bucket->layout.recalculate(CalculationParameters(parameters.tileID.overscaledZ));
auto& name = bucketName();
parameters.eachFilteredFeature(filter, [&] (const auto& feature, std::size_t index, const std::string& layerName) {
auto geometries = feature.getGeometries();
bucket->addGeometry(geometries);
parameters.featureIndex.insert(geometries, index, layerName, name);
});
return std::move(bucket);
}
float LineLayer::Impl::getLineWidth() const {
if (paint.lineGapWidth > 0) {
return paint.lineGapWidth + 2 * paint.lineWidth;
} else {
return paint.lineWidth;
}
}
optional<GeometryCollection> offsetLine(const GeometryCollection& rings, const double offset) {
if (offset == 0) return {};
GeometryCollection newRings;
Point<double> zero(0, 0);
for (const auto& ring : rings) {
newRings.emplace_back();
auto& newRing = newRings.back();
for (auto i = ring.begin(); i != ring.end(); i++) {
auto& p = *i;
Point<double> aToB = i == ring.begin() ?
zero :
util::perp(util::unit(convertPoint<double>(p - *(i - 1))));
Point<double> bToC = i + 1 == ring.end() ?
zero :
util::perp(util::unit(convertPoint<double>(*(i + 1) - p)));
Point<double> extrude = util::unit(aToB + bToC);
const double cosHalfAngle = extrude.x * bToC.x + extrude.y * bToC.y;
extrude *= (1.0 / cosHalfAngle);
newRing.push_back(convertPoint<int16_t>(extrude * offset) + p);
}
}
return newRings;
}
float LineLayer::Impl::getQueryRadius() const {
const std::array<float, 2>& translate = paint.lineTranslate;
return getLineWidth() / 2.0 + std::abs(paint.lineOffset) + util::length(translate[0], translate[1]);
}
bool LineLayer::Impl::queryIntersectsGeometry(
const GeometryCollection& queryGeometry,
const GeometryCollection& geometry,
const float bearing,
const float pixelsToTileUnits) const {
const float halfWidth = getLineWidth() / 2.0 * pixelsToTileUnits;
auto translatedQueryGeometry = FeatureIndex::translateQueryGeometry(
queryGeometry, paint.lineTranslate, paint.lineTranslateAnchor, bearing, pixelsToTileUnits);
auto offsetGeometry = offsetLine(geometry, paint.lineOffset * pixelsToTileUnits);
return util::multiPolygonIntersectsBufferedMultiLine(
translatedQueryGeometry.value_or(queryGeometry),
offsetGeometry.value_or(geometry),
halfWidth);
}
} // namespace style
} // namespace mbgl
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