Method paintEvent

src/gui/map/map_widget.cpp:851–954

}

void MapWidget::paintEvent(QPaintEvent* event)
{
	// Draw on the widget
	QPainter painter(this);
	QRect exposed = event->rect();
	
	if (!view)
	{
		painter.fillRect(exposed, QColor(Qt::gray));
		return;
	}
	
	// No colors, symbols, or objects? Provide a little help message ...
	bool no_contents = view->getMap()->getNumObjects() == 0 && view->getMap()->getNumTemplates() == 0 && !view->isGridVisible();
	
	QTransform transform = painter.worldTransform();
	
	// Update all dirty caches
	// TODO: It would be an idea to do these updates in a background thread and use the old caches in the meantime
	updateAllDirtyCaches();
	
	QRect target = exposed;
	if (pinching)
	{
		// Just draw the scaled map and templates
		painter.fillRect(exposed, QColor(Qt::gray));
		painter.translate(pinching_center.x(), pinching_center.y());
		painter.scale(pinching_factor, pinching_factor);
		painter.translate(-drag_start_pos.x(), -drag_start_pos.y());
	}
	else if (pan_offset != QPoint())
	{
		// Background color
		if (pan_offset.x() > 0)
			painter.fillRect(QRect(0, pan_offset.y(), pan_offset.x(), height() - pan_offset.y()), QColor(Qt::gray));
		else if (pan_offset.x() < 0)
			painter.fillRect(QRect(width() + pan_offset.x(), pan_offset.y(), -pan_offset.x(), height() - pan_offset.y()), QColor(Qt::gray));
		
		if (pan_offset.y() > 0)
			painter.fillRect(QRect(0, 0, width(), pan_offset.y()), QColor(Qt::gray));
		else if (pan_offset.y() < 0)
			painter.fillRect(QRect(0, height() + pan_offset.y(), width(), -pan_offset.y()), QColor(Qt::gray));
		
		target.translate(pan_offset);
	}
	
	if (!view->areAllTemplatesHidden() && isBelowTemplateVisible() && !below_template_cache.isNull() && view->getMap()->getFirstFrontTemplate() > 0)
	{
		painter.drawImage(target, below_template_cache, exposed);
	}
	else if (show_help && no_contents)
	{
		painter.save();
		painter.setTransform(transform);
		if (view->getMap()->getNumColors() == 0)
			showHelpMessage(&painter, tr("Empty map!\n\nStart by defining some colors:\nSelect Symbols -> Color window to\nopen the color dialog and\ndefine the colors there."));
		else if (view->getMap()->getNumSymbols() == 0)
			showHelpMessage(&painter, tr("No symbols!\n\nNow define some symbols:\nRight-click in the symbol bar\nand select \"New symbol\"\nto create one."));