/*FreeMind - A Program for creating and viewing Mindmaps
 *Copyright (C) 2000-2006 Joerg Mueller, Daniel Polansky, Christian Foltin, Dimitri Polivaev and others.
 *
 *See COPYING for Details
 *
 *This program is free software; you can redistribute it and/or
 *modify it under the terms of the GNU General Public License
 *as published by the Free Software Foundation; either version 2
 *of the License, or (at your option) any later version.
 *
 *This program is distributed in the hope that it will be useful,
 *but WITHOUT ANY WARRANTY; without even the implied warranty of
 *MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *GNU General Public License for more details.
 *
 *You should have received a copy of the GNU General Public License
 *along with this program; if not, write to the Free Software
 *Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
/*
 * Created on 05.06.2005
 *
 */
package freemind.view.mindmapview;

import java.awt.Dimension;
import java.awt.Point;

import freemind.main.Resources;
import freemind.main.Tools;

/**
 * Root layout.
 * @author dimitri 05.06.2005
 */
public class VerticalRootNodeViewLayout extends NodeViewLayoutAdapter {
	private static final String USE_COMMON_OUT_POINT_FOR_ROOT_NODE_STRING = "use_common_out_point_for_root_node";
	static boolean USE_COMMON_OUT_POINT_FOR_ROOT_NODE = Resources.getInstance()
			.getBoolProperty(USE_COMMON_OUT_POINT_FOR_ROOT_NODE_STRING);

	static private VerticalRootNodeViewLayout instance = null;

	protected void layout() {
		final int rightContentHeight = getChildContentHeight(false);
		int rightChildVerticalShift = getChildVerticalShift(false);
		final int leftContentHeight = getChildContentHeight(true);
		int leftChildVerticalShift = getChildVerticalShift(true);
		final int childHorizontalShift = getChildHorizontalShift();
		final int contentHeight = Math.max(rightContentHeight,
				leftContentHeight);
		final int x = Math.max(getSpaceAround(), -childHorizontalShift);
		if (getView().isContentVisible()) {
			getContent().setVisible(true);
			final Dimension contentPreferredSize = getContent()
					.getPreferredSize();
			rightChildVerticalShift += (contentPreferredSize.height - rightContentHeight) / 2;
			leftChildVerticalShift += (contentPreferredSize.height - leftContentHeight) / 2;
			final int childVerticalShift = Math.min(rightChildVerticalShift,
					leftChildVerticalShift);
			final int y = Math.max(getSpaceAround(), -childVerticalShift);
			getContent().setBounds(x, y, contentPreferredSize.width,
					contentPreferredSize.height);
		} else {
			getContent().setVisible(false);
			int childVerticalShift = Math.min(rightChildVerticalShift,
					leftChildVerticalShift);
			final int y = Math.max(getSpaceAround(), -childVerticalShift);
			getContent().setBounds(x, y, 0, contentHeight);
		}

		placeLeftChildren(leftChildVerticalShift);
		int width1 = getView().getWidth();
		int height1 = getView().getHeight();
		placeRightChildren(rightChildVerticalShift);
		int width2 = getView().getWidth();
		int height2 = getView().getHeight();
		getView().setSize(Math.max(width1, width2), Math.max(height1, height2));

	}

	static VerticalRootNodeViewLayout getInstance() {
		if (instance == null)
			instance = new VerticalRootNodeViewLayout();
		return instance;
	}

	public void layoutNodeMotionListenerView(NodeMotionListenerView view) {
		// there is no move handle at root.
	}

	public Point getMainViewOutPoint(NodeView view, NodeView targetView,
			Point destinationPoint) {
		final MainView mainView = view.getMainView();
		if (USE_COMMON_OUT_POINT_FOR_ROOT_NODE) {
			if (targetView.isLeft()) {
				return mainView.getLeftPoint();
			} else {
				return mainView.getRightPoint();
			}
		}
		final Point p = new Point(destinationPoint);
		Tools.convertPointFromAncestor(view, p, mainView);
		double nWidth = mainView.getWidth() / 2f;
		double nHeight = mainView.getHeight() / 2f;
		final Point centerPoint = new Point((int) nWidth, (int) nHeight);
		// assume, that destinationPoint is on the right:
		double angle = Math.atan((p.y - centerPoint.y + 0f)
				/ (p.x - centerPoint.x + 0f));
		if (p.x < centerPoint.x) {
			angle += Math.PI;
		}
		// now determine point on ellipsis corresponding to that angle:
		final Point out = new Point(centerPoint.x
				+ (int) (Math.cos(angle) * nWidth), centerPoint.y
				+ (int) (Math.sin(angle) * nHeight));
		return out;
	}

	public Point getMainViewInPoint(NodeView view) {
		final Point centerPoint = view.getMainView().getCenterPoint();
		return centerPoint;
	}

}