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annotate dwtx/draw2d/FanRouter.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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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 dwtx.draw2d.FanRouter;
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14
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15 import dwt.dwthelper.utils;
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16
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17 import dwtx.draw2d.geometry.Point;
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18 import dwtx.draw2d.geometry.PointList;
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19 import dwtx.draw2d.geometry.Ray;
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20 import dwtx.draw2d.AutomaticRouter;
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21 import dwtx.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 }