Method TextRenderable

src/core/renderables/renderable_implementation.cpp:698–754

// ### TextRenderable ###

TextRenderable::TextRenderable(const TextSymbol* symbol, const TextObject* text_object, const MapColor* color, double anchor_x, double anchor_y)
: Renderable { color }
, anchor_x   { anchor_x }
, anchor_y   { anchor_y }
, rotation   { 0.0 }
, scale_factor { symbol->getFontSize() / TextSymbol::internal_point_size }
{
	path.setFillRule(Qt::WindingFill);	// Otherwise, when text and an underline intersect, holes appear
	
	const QFont& font(symbol->getQFont());
	const QFontMetricsF& metrics(symbol->getFontMetrics());
	
	int num_lines = text_object->getNumLines();
	for (int i=0; i < num_lines; i++)
	{
		const TextObjectLineInfo* line_info = text_object->getLineInfo(i);
		
		double line_y = line_info->line_y;
		
		double underline_x0 = 0.0;
		double underline_y0 = line_info->line_y + metrics.underlinePos();
		double underline_y1 = underline_y0 + metrics.lineWidth();
		
		auto num_parts = line_info->part_infos.size();
		for (std::size_t j=0; j < num_parts; j++)
		{
			const TextObjectPartInfo& part(line_info->part_infos.at(j));
			if (font.underline())
			{
				if (j > 0)
				{
					// draw underline for gap between parts as rectangle
					// TODO: watch out for inconsistency between text and gap underline
					path.moveTo(underline_x0, underline_y0);
					path.lineTo(part.part_x,  underline_y0);
					path.lineTo(part.part_x,  underline_y1);
					path.lineTo(underline_x0, underline_y1);
					path.closeSubpath();
				}
				underline_x0 = part.part_x;
			}
			path.addText(part.part_x, line_y, font, part.part_text);
		}
	}
	
	QTransform t { 1.0, 0.0, 0.0, 1.0, anchor_x, anchor_y };
	t.scale(scale_factor, scale_factor);
	
	auto rotation_rad = text_object->getRotation();
	if (!qIsNull(rotation_rad))
	{
		rotation = -qRadiansToDegrees(rotation_rad);
		t.rotate(rotation);
	}
	
	extent = t.mapRect(path.controlPointRect());
}