Method executeForLine

src/core/objects/boolean_tool.cpp:446–527

}

void BooleanTool::executeForLine(const PathObject* area, const PathObject* line, BooleanTool::PathObjects& out_objects) const
{
	if (op != BooleanTool::Intersection && op != BooleanTool::Difference)
	{
		Q_ASSERT_X(false, "BooleanTool::executeForLine", "Only intersection and difference are supported.");
		return; // no-op in release build
	}
	if (line->parts().size() != 1)
	{
		Q_ASSERT_X(false, "BooleanTool::executeForLine", "Only single-part lines are supported.");
		return; // no-op in release build
	}
	
	// Calculate all intersection points of line with the area path
	PathObject::Intersections intersections;
	line->calcAllIntersectionsWith(area, intersections);
	intersections.normalize();
	
	PathObject* first_segment = nullptr;
	PathObject* last_segment = nullptr;
	
	const auto& part        = line->parts().front();
	const auto& path_coords = part.path_coords;
	
	// Only one segment?
	if (intersections.empty())
	{
		auto middle_length = part.length();
		auto middle = SplitPathCoord::at(path_coords, middle_length);
		if (area->isPointInsideArea(middle.pos) == (op == BooleanTool::Intersection))
			out_objects.push_back(line->duplicate());
		return;
	}
	
	// First segment
	auto middle_length = intersections[0].length / 2;
	auto middle = SplitPathCoord::at(path_coords, middle_length);
	if (area->isPointInsideArea(middle.pos) == (op == BooleanTool::Intersection))
	{
		PathObject* segment = line->duplicate();
		segment->changePathBounds(0, 0.0, intersections[0].length);
		first_segment = segment;
	}
	
	// Middle segments
	for (std::size_t i = 0; i < intersections.size() - 1; ++i)
	{
		middle_length = (intersections[i].length + intersections[i+1].length) / 2;
		auto middle = SplitPathCoord::at(path_coords, middle_length);
		if (area->isPointInsideArea(middle.pos) == (op == BooleanTool::Intersection))
		{
			PathObject* segment = line->duplicate();
			segment->changePathBounds(0, intersections[i].length, intersections[i+1].length);
			out_objects.push_back(segment);
		}
	}
	
	// Last segment