/**
 * Copyright 2010, 2011 Jingjing Li.
 *
 * This file is part of jplot2d.
 *
 * jplot2d is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or any later version.
 *
 * jplot2d 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 Lesser Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with jplot2d. If not, see .
 */
package org.jplot2d.layout;

import org.jplot2d.element.impl.PlotEx;
import org.jplot2d.util.DoubleDimension2D;
import org.jplot2d.util.Insets2D;

/**
 * This LayoutDirector overlay all plots over the top of each other. All subplots are put inside the
 * base subplot's content area. The content bounds of subplots are defined by
 * {@link BoundsConstraint} .
 * 
 * 
 * @author Jingjing Li
 * 
 */
public class OverlayLayoutDirector extends SimpleLayoutDirector {

	public void layout(PlotEx plot) {

		super.layout(plot);

		// layout overlay subplots
		layoutSubplots(plot);

	}

	/**
	 * layout overlay plots except the base.
	 * 
	 * @param plots
	 */
	private void layoutSubplots(PlotEx plot) {
		if (plot.getSubplots().length == 0) {
			return;
		}

		double baseX = 0;
		double baseY = 0;
		double baseW = plot.getContentSize().getWidth();
		double baseH = plot.getContentSize().getHeight();

		for (PlotEx sp : plot.getSubplots()) {

			double spacingL = 0;
			double spacingR = 0;
			double spacingT = 0;
			double spacingB = 0;

			BoundsConstraint bc = (BoundsConstraint) getConstraint(sp);
			if (bc != null) {
				Insets2D fixed = bc.getFixedInsets();
				Insets2D elastic = bc.getElasticInsets();
				spacingL = fixed.getLeft() + elastic.getLeft() * baseW;
				spacingR = fixed.getRight() + elastic.getRight() * baseW;
				spacingT = fixed.getTop() + elastic.getTop() * baseH;
				spacingB = fixed.getBottom() + elastic.getBottom() * baseH;
			}

			double spbX = baseX + spacingL;
			double spbY = baseY + spacingB;
			double spbW = baseW - spacingL - spacingR;
			double spbH = baseH - spacingT - spacingB;

			// locate plot
			sp.setLocation(spbX, spbY);
			sp.setContentConstrant(new DoubleDimension2D(spbW, spbH));
		}

	}

}