package plab.prefuseTests;

import java.awt.geom.Rectangle2D;

import prefuse.util.display.ItemBoundsListener;
import prefuse.Display;
import prefuse.util.GraphicsLib;
import prefuse.util.display.DisplayLib;

/**
 * Adjusts scale of overview window to fit graph
 * to viewing window.
 */
public class FitOverviewListener implements ItemBoundsListener {

    private Rectangle2D m_bounds = new Rectangle2D.Double();
    private Rectangle2D m_temp = new Rectangle2D.Double();
    private double m_d = 15;

    public void itemBoundsChanged(Display d) {
        d.getItemBounds(m_temp);
        GraphicsLib.expand(m_temp, 25 / d.getScale());

        double dd = m_d / d.getScale();
        double xd = Math.abs(m_temp.getMinX() - m_bounds.getMinX());
        double yd = Math.abs(m_temp.getMinY() - m_bounds.getMinY());
        double wd = Math.abs(m_temp.getWidth() - m_bounds.getWidth());
        double hd = Math.abs(m_temp.getHeight() - m_bounds.getHeight());
        if (xd > dd || yd > dd || wd > dd || hd > dd) {
            m_bounds.setFrame(m_temp);
            DisplayLib.fitViewToBounds(d, m_bounds, 0);
        }
    }
} // end of class FitOverviewListener