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Core visualization support for the JUNG project

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/*
 * Copyright (c) 2003, The JUNG Authors
 * All rights reserved.
 * 
 * This software is open-source under the BSD license; see either "license.txt"
 * or https://github.com/jrtom/jung/blob/master/LICENSE for a description.
 * 
 */
package edu.uci.ics.jung.visualization.control;

import java.awt.geom.Point2D;

import edu.uci.ics.jung.visualization.Layer;
import edu.uci.ics.jung.visualization.VisualizationServer;
import edu.uci.ics.jung.visualization.transform.MutableTransformer;

/**
 * Scales to the absolute value passed as an argument.
 * It first resets the scaling Functions, then uses
 * the relative CrossoverScalingControl to achieve the
 * absolute value.
 * 
 * @author Tom Nelson 
 *
 */
public class AbsoluteCrossoverScalingControl extends CrossoverScalingControl
        implements ScalingControl {

	/**
     * Scale to the absolute value passed as 'amount'.
	 * 
	 * @param vv the VisualizationServer used for rendering; provides the layout and view transformers.
	 * @param amount the amount by which to scale
	 * @param at the point of reference for scaling
	 */
	public void scale(VisualizationServer vv, float amount, Point2D at) {
        MutableTransformer layoutTransformer
        	= vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.LAYOUT);
        MutableTransformer viewTransformer
        	= vv.getRenderContext().getMultiLayerTransformer().getTransformer(Layer.VIEW);
        double modelScale = layoutTransformer.getScale();
        double viewScale = viewTransformer.getScale();
        double inverseModelScale = Math.sqrt(crossover)/modelScale;
        double inverseViewScale = Math.sqrt(crossover)/viewScale;
        
        Point2D transformedAt
        	= vv.getRenderContext().getMultiLayerTransformer().inverseTransform(Layer.VIEW, at);
        
        // return the Functions to 1.0
        layoutTransformer.scale(inverseModelScale, inverseModelScale, transformedAt);
        viewTransformer.scale(inverseViewScale, inverseViewScale, at);

        super.scale(vv, amount, at);
    }
}