| Line | Hits | Source |
|---|---|---|
| 1 | /* | |
| 2 | * Copyright (c) 2005, the JUNG Project and the Regents of the University | |
| 3 | * of California | |
| 4 | * All rights reserved. | |
| 5 | * | |
| 6 | * This software is open-source under the BSD license; see either | |
| 7 | * "license.txt" or | |
| 8 | * http://jung.sourceforge.net/license.txt for a description. | |
| 9 | * Created on Mar 8, 2005 | |
| 10 | * | |
| 11 | */ | |
| 12 | package edu.uci.ics.jung.visualization.control; | |
| 13 | ||
| 14 | import java.awt.geom.Point2D; | |
| 15 | ||
| 16 | import edu.uci.ics.jung.visualization.VisualizationViewer; | |
| 17 | import edu.uci.ics.jung.visualization.transform.MutableTransformer; | |
| 18 | ||
| 19 | /** | |
| 20 | * A scaling control that has a crossover point. | |
| 21 | * When the overall scale of the view and | |
| 22 | * model is less than the crossover point, the scaling is applied | |
| 23 | * to the view's transform and the graph nodes, labels, etc grow | |
| 24 | * smaller. This preserves the overall shape of the graph. | |
| 25 | * When the scale is larger than the crossover, the scaling is | |
| 26 | * applied to the graph layout. The graph spreads out, but the | |
| 27 | * vertices and labels grow no larger than their original size. | |
| 28 | * | |
| 29 | * @author Tom Nelson | |
| 30 | */ | |
| 31 | 0 | public class CrossoverScalingControl implements ScalingControl { |
| 32 | ||
| 33 | /** | |
| 34 | * Point where scale crosses over from view to layout. | |
| 35 | */ | |
| 36 | 0 | protected double crossover = 1.0; |
| 37 | ||
| 38 | /** | |
| 39 | * Sets the crossover point to the specified value. | |
| 40 | */ | |
| 41 | public void setCrossover(double crossover) { | |
| 42 | 0 | this.crossover = crossover; |
| 43 | 0 | } |
| 44 | ||
| 45 | /** | |
| 46 | * Returns the current crossover value. | |
| 47 | */ | |
| 48 | public double getCrossover() { | |
| 49 | 0 | return crossover; |
| 50 | } | |
| 51 | ||
| 52 | /** | |
| 53 | * @see edu.uci.ics.jung.visualization.control.ScalingControl#scale(VisualizationViewer, float, Point2D) | |
| 54 | */ | |
| 55 | public void scale(VisualizationViewer vv, float amount, Point2D at) { | |
| 56 | ||
| 57 | 0 | MutableTransformer layoutTransformer = vv.getLayoutTransformer(); |
| 58 | 0 | MutableTransformer viewTransformer = vv.getViewTransformer(); |
| 59 | 0 | double modelScale = layoutTransformer.getScale(); |
| 60 | 0 | double viewScale = viewTransformer.getScale(); |
| 61 | 0 | double inverseModelScale = Math.sqrt(crossover)/modelScale; |
| 62 | 0 | double inverseViewScale = Math.sqrt(crossover)/viewScale; |
| 63 | 0 | double scale = modelScale * viewScale; |
| 64 | ||
| 65 | 0 | Point2D transformedAt = vv.inverseViewTransform(at); |
| 66 | ||
| 67 | 0 | if((scale*amount - crossover)*(scale*amount - crossover) < 0.001) { |
| 68 | // close to the control point, return both transformers to a scale of 1.0 | |
| 69 | 0 | layoutTransformer.scale(inverseModelScale, inverseModelScale, transformedAt); |
| 70 | 0 | viewTransformer.scale(inverseViewScale, inverseViewScale, at); |
| 71 | 0 | } else if(scale*amount < crossover) { |
| 72 | // scale the viewTransformer, return the layoutTransformer to 1.0 | |
| 73 | 0 | viewTransformer.scale(amount, amount, at); |
| 74 | 0 | layoutTransformer.scale(inverseModelScale, inverseModelScale, transformedAt); |
| 75 | } else { | |
| 76 | // scale the layoutTransformer, return the viewTransformer to 1.0 | |
| 77 | 0 | layoutTransformer.scale(amount, amount, transformedAt); |
| 78 | 0 | viewTransformer.scale(inverseViewScale, inverseViewScale, at); |
| 79 | } | |
| 80 | 0 | vv.repaint(); |
| 81 | 0 | } |
| 82 | } |
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