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#include <mbgl/style/layers/line_layer_impl.hpp>
#include <mbgl/style/property_evaluation_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::cascade(const CascadeParameters& parameters) {
paint.cascade(parameters);
}
bool LineLayer::Impl::evaluate(const PropertyEvaluationParameters& parameters) {
// for scaling dasharrays
PropertyEvaluationParameters dashArrayParams = parameters;
dashArrayParams.z = std::floor(dashArrayParams.z);
dashLineWidth = paint.evaluate<LineWidth>(dashArrayParams);
paint.evaluate(parameters);
passes = (paint.evaluated.get<LineOpacity>().constantOr(1.0) > 0
&& paint.evaluated.get<LineColor>().constantOr(Color::black()).a > 0
&& paint.evaluated.get<LineWidth>() > 0)
? RenderPass::Translucent : RenderPass::None;
return paint.hasTransition();
}
std::unique_ptr<Bucket> LineLayer::Impl::createBucket(const BucketParameters& parameters, const std::vector<const Layer*>& layers) const {
return std::make_unique<LineBucket>(parameters, layers, layout);
}
float LineLayer::Impl::getLineWidth(const GeometryTileFeature& feature, const float zoom) const {
float lineWidth = paint.evaluated.get<LineWidth>();
float gapWidth = paint.evaluated.get<LineGapWidth>()
.evaluate(feature, zoom, LineGapWidth::defaultValue());
if (gapWidth) {
return gapWidth + 2 * lineWidth;
} else {
return 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;
}
bool LineLayer::Impl::queryIntersectsFeature(
const GeometryCoordinates& queryGeometry,
const GeometryTileFeature& feature,
const float zoom,
const float bearing,
const float pixelsToTileUnits) const {
// Translate query geometry
auto translatedQueryGeometry = FeatureIndex::translateQueryGeometry(
queryGeometry, paint.evaluated.get<LineTranslate>(), paint.evaluated.get<LineTranslateAnchor>(), bearing, pixelsToTileUnits);
// Evaluate function
auto offset = paint.evaluated.get<LineOffset>().evaluate(feature, zoom, LineOffset::defaultValue()) * pixelsToTileUnits;
// Apply offset to geometry
auto offsetGeometry = offsetLine(feature.getGeometries(), offset);
// Test intersection
const float halfWidth = getLineWidth(feature, zoom) / 2.0 * pixelsToTileUnits;
return util::polygonIntersectsBufferedMultiLine(
translatedQueryGeometry.value_or(queryGeometry),
offsetGeometry.value_or(feature.getGeometries()),
halfWidth);
}
} // namespace style
} // namespace mbgl
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