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#include <mbgl/renderer/layers/render_line_layer.hpp>
#include <mbgl/renderer/buckets/line_bucket.hpp>
#include <mbgl/style/layers/line_layer_impl.hpp>
#include <mbgl/geometry/feature_index.hpp>
#include <mbgl/util/math.hpp>
#include <mbgl/util/intersection_tests.hpp>
namespace mbgl {
RenderLineLayer::RenderLineLayer(Immutable<style::LineLayer::Impl> _impl)
: RenderLayer(style::LayerType::Line, _impl),
unevaluated(impl().paint.untransitioned()) {
}
const style::LineLayer::Impl& RenderLineLayer::impl() const {
return static_cast<const style::LineLayer::Impl&>(*baseImpl);
}
std::unique_ptr<Bucket> RenderLineLayer::createBucket(const BucketParameters& parameters, const std::vector<const RenderLayer*>& layers) const {
return std::make_unique<LineBucket>(parameters, layers, impl().layout);
}
void RenderLineLayer::transition(const TransitionParameters& parameters) {
unevaluated = impl().paint.transitioned(parameters, std::move(unevaluated));
}
void RenderLineLayer::evaluate(const PropertyEvaluationParameters& parameters) {
style::Properties<LineFloorwidth>::Unevaluated extra(unevaluated.get<style::LineWidth>());
auto dashArrayParams = parameters;
dashArrayParams.useIntegerZoom = true;
evaluated = RenderLinePaintProperties::PossiblyEvaluated(
unevaluated.evaluate(parameters).concat(extra.evaluate(dashArrayParams)));
passes = (evaluated.get<style::LineOpacity>().constantOr(1.0) > 0
&& evaluated.get<style::LineColor>().constantOr(Color::black()).a > 0
&& evaluated.get<style::LineWidth>().constantOr(1.0) > 0)
? RenderPass::Translucent : RenderPass::None;
}
bool RenderLineLayer::hasTransition() const {
return unevaluated.hasTransition();
}
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 RenderLineLayer::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,
evaluated.get<style::LineTranslate>(),
evaluated.get<style::LineTranslateAnchor>(),
bearing,
pixelsToTileUnits);
// Evaluate function
auto offset = evaluated.get<style::LineOffset>()
.evaluate(feature, zoom, style::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);
}
float RenderLineLayer::getLineWidth(const GeometryTileFeature& feature, const float zoom) const {
float lineWidth = evaluated.get<style::LineWidth>()
.evaluate(feature, zoom, style::LineWidth::defaultValue());
float gapWidth = evaluated.get<style::LineGapWidth>()
.evaluate(feature, zoom, style::LineGapWidth::defaultValue());
if (gapWidth) {
return gapWidth + 2 * lineWidth;
} else {
return lineWidth;
}
}
} // namespace mbgl
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