Mercurial > projects > dwt2
annotate org.eclipse.draw2d/src/org/eclipse/draw2d/FanRouter.d @ 12:bc29606a740c
Added dwt-addons in original directory structure of eclipse.org
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 14 Mar 2009 18:23:29 +0100 |
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1 /******************************************************************************* |
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2 * Copyright (c) 2000, 2005 IBM Corporation and others. |
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3 * All rights reserved. This program and the accompanying materials |
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4 * are made available under the terms of the Eclipse Public License v1.0 |
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5 * which accompanies this distribution, and is available at |
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6 * http://www.eclipse.org/legal/epl-v10.html |
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7 * |
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8 * Contributors: |
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9 * IBM Corporation - initial API and implementation |
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10 * Port to the D programming language: |
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11 * Frank Benoit <benoit@tionex.de> |
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12 *******************************************************************************/ |
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13 module org.eclipse.draw2d.FanRouter; |
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14 |
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15 import java.lang.all; |
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16 |
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17 import org.eclipse.draw2d.geometry.Point; |
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18 import org.eclipse.draw2d.geometry.PointList; |
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19 import org.eclipse.draw2d.geometry.Ray; |
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20 import org.eclipse.draw2d.AutomaticRouter; |
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21 import org.eclipse.draw2d.PositionConstants; |
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22 |
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23 /** |
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24 * Automatic router that spreads its {@link Connection Connections} in a fan-like fashion |
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25 * upon collision. |
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26 */ |
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27 public class FanRouter |
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28 : AutomaticRouter |
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29 { |
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30 |
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31 private int separation = 10; |
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32 |
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33 /** |
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34 * Returns the separation in pixels between fanned connections. |
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35 * |
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36 * @return the separation |
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37 * @since 2.0 |
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38 */ |
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39 public int getSeparation() { |
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40 return separation; |
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41 } |
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42 |
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43 /** |
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44 * Modifies a given PointList that collides with some other PointList. The given |
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45 * <i>index</i> indicates that this it the i<sup>th</sup> PointList in a group of |
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46 * colliding points. |
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47 * |
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48 * @param points the colliding points |
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49 * @param index the index |
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50 */ |
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51 protected void handleCollision(PointList points, int index) { |
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52 Point start = points.getFirstPoint(); |
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53 Point end = points.getLastPoint(); |
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54 |
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55 if (start.opEquals(end)) |
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56 return; |
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57 |
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58 Point midPoint = new Point((end.x + start.x) / 2, (end.y + start.y) / 2); |
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59 int position = end.getPosition(start); |
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60 Ray ray; |
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61 if (position is PositionConstants.SOUTH || position is PositionConstants.EAST) |
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62 ray = new Ray(start, end); |
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63 else |
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64 ray = new Ray(end, start); |
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65 double length = ray.length(); |
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66 |
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67 double xSeparation = separation * ray.x / length; |
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68 double ySeparation = separation * ray.y / length; |
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69 |
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70 Point bendPoint; |
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71 |
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72 if (index % 2 is 0) { |
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73 bendPoint = new Point( |
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74 midPoint.x + (index / 2) * (-1 * ySeparation), |
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75 midPoint.y + (index / 2) * xSeparation); |
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76 } else { |
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77 bendPoint = new Point( |
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78 midPoint.x + (index / 2) * ySeparation, |
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79 midPoint.y + (index / 2) * (-1 * xSeparation)); |
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80 } |
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81 if (!bendPoint.opEquals(midPoint)) |
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82 points.insertPoint(bendPoint, 1); |
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83 } |
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84 |
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85 /** |
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86 * Sets the colliding {@link Connection Connection's} separation in pixels. |
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87 * |
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88 * @param value the separation |
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89 * @since 2.0 |
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90 */ |
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91 public void setSeparation(int value) { |
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92 separation = value; |
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93 } |
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94 |
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95 } |