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