diff options
Diffstat (limited to 'src/mbgl/style/layers/line_layer_impl.cpp')
-rw-r--r-- | src/mbgl/style/layers/line_layer_impl.cpp | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/src/mbgl/style/layers/line_layer_impl.cpp b/src/mbgl/style/layers/line_layer_impl.cpp new file mode 100644 index 0000000000..b7ee9dc5bf --- /dev/null +++ b/src/mbgl/style/layers/line_layer_impl.cpp @@ -0,0 +1,116 @@ +#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[3] > 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 |