Mercurial > projects > dwt2
annotate org.eclipse.draw2d/src/org/eclipse/draw2d/RelativeBendpoint.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, 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 } |