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annotate dwtx/draw2d/MidpointLocator.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.MidpointLocator;
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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.ConnectionLocator;
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19 import dwtx.draw2d.Connection;
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20
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21 /**
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22 * A ConnectionLocator that is used to place figures at the midpoint between two points on
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23 * a {@link dwtx.draw2d.Connection}.
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24 */
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25 public class MidpointLocator
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26 : ConnectionLocator
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27 {
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28
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29 private int index;
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30
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31 /**
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32 * Constructs a MidpointLocator with associated Connection <i>c</i> and index <i>i</i>.
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33 * The points at index i and i+1 on the connection are used to calculate the midpoint of
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34 * the line segment.
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35 *
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36 * @param c the connection associated with the locator
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37 * @param i the point from where the connection's midpoint will be calculated.
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38 * @since 2.0
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39 */
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40 public this(Connection c, int i) {
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41 super(c);
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42 index = i;
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43 }
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44
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45 /**
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46 * Returns this MidpointLocator's index. This integer represents the position of the start
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47 * point in this MidpointLocator's associated {@link Connection} from where midpoint
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48 * calculation will be made.
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49 *
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50 * @return the locator's index
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51 * @since 2.0
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52 */
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53
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54 protected int getIndex() {
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55 return index;
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56 }
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57
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58 /**
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59 * Returns the point of reference associated with this locator. This point will be midway
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60 * between points at 'index' and 'index' + 1.
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61 *
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62 * @return the reference point
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63 * @since 2.0
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64 */
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65 protected Point getReferencePoint() {
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66 Connection conn = getConnection();
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67 Point p = Point.SINGLETON;
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68 Point p1 = conn.getPoints().getPoint(getIndex());
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69 Point p2 = conn.getPoints().getPoint(getIndex() + 1);
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70 conn.translateToAbsolute(p1);
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71 conn.translateToAbsolute(p2);
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72 p.x = (p2.x - p1.x) / 2 + p1.x;
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73 p.y = (p2.y - p1.y) / 2 + p1.y;
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74 return p;
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75 }
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76
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77 }