Method updateRectangle

src/tools/draw_rectangle_tool.cpp:592–691

}

void DrawRectangleTool::updateRectangle()
{
	double angle = angle_helper->getConstrainedCursorPosMap(constrained_pos_map, constrained_pos_map);
	
	if (angles.size() == 1)
	{
		// Update vectors and angles
		// preview_path is going to be modified. Non-const getCoordinate is fine.
		forward_vector = constrained_pos_map - MapCoordF(preview_path->getCoordinate(0));
		forward_vector.normalize();
		
		angles.back() = -forward_vector.angle();
		
		// Update rectangle
		MapCoord coord = MapCoord(constrained_pos_map);
		coord.setDashPoint(draw_dash_points);
		preview_path->setCoordinate(1, coord);
	}
	else
	{
		// Update vectors and angles
		forward_vector = MapCoordF::fromPolar(1.0, -angle);
		
		angles.back() = angle;
		
		// Update rectangle
		auto cur_point_index = angles.size();
		deleteClosePoint();
		
		// preview_path was be modified. Non-const getCoordinate is fine.
		auto forward_dist = MapCoordF::dotProduct(forward_vector, constrained_pos_map - MapCoordF(preview_path->getCoordinate(cur_point_index - 1)));
		MapCoord coord = preview_path->getCoordinate(cur_point_index - 1) + MapCoord(forward_dist * forward_vector);
		
		snapped_to_line = false;
		auto best_snap_distance_sq = std::numeric_limits<qreal>::max();
		if (ctrl_pressed && angles.size() > 2)
		{
			// Try to snap to existing lines
			MapCoord original_coord = coord;
			for (int i = 0; i < int(angles.size()) - 1; ++i)
			{
				MapCoordF direction(100, 0);
				direction.rotate(-angles[i]);
				
				int num_steps;
				double angle_step, angle_offset = 0;
				if (i == 0 || qAbs(qAbs(fmod_pos(angles[i], M_PI) - fmod_pos(angles[i-1], M_PI)) - (M_PI / 2)) < 0.1)
				{
					num_steps = 2;
					angle_step = M_PI/2;
				}
				else
				{
					num_steps = 4;
					angle_step = M_PI/4;
				}
				
				for (int k = 0; k < num_steps; ++k)