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Added dwt-addons in original directory structure of eclipse.org
author Frank Benoit <benoit@tionex.de>
date Sat, 14 Mar 2009 18:23:29 +0100
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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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.RelativeBendpoint;
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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.Dimension;
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18 import org.eclipse.draw2d.geometry.Point;
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19 import org.eclipse.draw2d.geometry.PrecisionPoint;
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20 import org.eclipse.draw2d.Bendpoint;
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21 import org.eclipse.draw2d.Connection;
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22
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23 /**
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24 * RelativeBendpoint is a Bendpoint that calculates its location based on its distance
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25 * from the start and end points of the {@link Connection}, as well as its weight. See
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26 * {@link #setWeight(float)} for a description of what behavior different weights will
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27 * provide.
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28 */
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29 public class RelativeBendpoint
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30 : Bendpoint
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31 {
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32
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33 private Connection connection;
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34 private float weight = 0.5f;
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35 private Dimension d1, d2;
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36
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37 /**
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38 * Constructs a new RelativeBendpoint.
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39 *
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40 * @since 2.0
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41 */
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42 public this() { }
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43
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44 /**
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45 * Constructs a new RelativeBendpoint and associates it with the given Connection.
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46 * @param conn The Connection this Bendpoint is associated with
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47 * @since 2.0
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48 */
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49 public this(Connection conn) {
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50 setConnection(conn);
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51 }
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52
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53 /**
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54 * Returns the Connection this Bendpoint is associated with.
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55 * @return The Connection this Bendpoint is associated with
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56 * @since 2.0
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57 */
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58 protected Connection getConnection() {
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59 return connection;
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60 }
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61
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62 /**
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63 * Calculates and returns this Bendpoint's new location.
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64 * @return This Bendpoint's new location
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65 * @since 2.0
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66 */
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67 public Point getLocation() {
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68 PrecisionPoint a1 = new PrecisionPoint(getConnection().getSourceAnchor().getReferencePoint());
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69 PrecisionPoint a2 = new PrecisionPoint(getConnection().getTargetAnchor().getReferencePoint());
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70
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71 getConnection().translateToRelative(a1);
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72 getConnection().translateToRelative(a2);
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73
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74 return new PrecisionPoint((a1.preciseX() + d1.preciseWidth())
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75 * (1f - weight) + weight * (a2.preciseX() + d2.preciseWidth()),
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76 (a1.preciseY() + d1.preciseHeight()) * (1f - weight) + weight
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77 * (a2.preciseY() + d2.preciseHeight()));
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78 }
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79
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80 /**
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81 * Sets the Connection this bendpoint should be associated with.
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82 * @param conn The Connection this bendpoint should be associated with
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83 * @since 2.0
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84 */
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85 public void setConnection(Connection conn) {
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86 connection = conn;
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87 }
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88
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89 /**
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90 * Sets the Dimensions representing the X and Y distances this Bendpoint is from the start
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91 * and end points of the Connection. These Dimensions are generally set once and are used
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92 * in calculating the Bendpoint's location.
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93 * @param dim1 The X and Y distances this Bendpoint is from the start of the Connection
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94 * @param dim2 The X and Y distances this Bendpoint is from the end of the Connection
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95 * @since 2.0
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96 */
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97 public void setRelativeDimensions(Dimension dim1, Dimension dim2) {
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98 d1 = dim1;
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99 d2 = dim2;
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100 }
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101
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102 /**
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103 * Sets the weight this Bendpoint should use to calculate its location. The weight should
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104 * be between 0.0 and 1.0. A weight of 0.0 will cause the Bendpoint to follow the start
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105 * point, while a weight of 1.0 will cause the Bendpoint to follow the end point. A weight
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106 * of 0.5 (the default) will cause the Bendpoint to maintain its original aspect ratio
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107 * between the start and end points.
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108 * @param w The weight
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109 * @since 2.0
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110 */
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111 public void setWeight(float w) {
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112 weight = w;
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113 }
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114
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115 }