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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/ConnectionLocator.d @ 104:88652073d1c2
More work on icu
author | Frank Benoit <benoit@tionex.de> |
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date | Sat, 02 May 2009 11:27:24 +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 org.eclipse.draw2d.ConnectionLocator; |
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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.PointList; |
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20 import org.eclipse.draw2d.AbstractLocator; |
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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 * Repositions a {@link Figure} attached to a {@link Connection} when the Connection is |
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25 * moved. Provides for alignment at the start (source), middle, or end (target) of the |
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26 * Connection. |
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27 */ |
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28 public class ConnectionLocator |
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29 : AbstractLocator |
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30 { |
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31 |
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32 /** @deprecated Use {@link #SOURCE} */ |
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33 public static const int START = 2; |
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34 /** The start (or source) of the Connection */ |
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35 public static const int SOURCE = 2; |
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36 |
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37 /** @deprecated Use {@link #TARGET} */ |
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38 public static const int END = 3; |
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39 /** The end (or target) of the Connection */ |
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40 public static const int TARGET = 3; |
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41 |
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42 /** |
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43 * @deprecated Use {@link #MIDDLE} instead, since the location is not the midpoint of a |
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44 * line-segment, but the middle of a polyline. |
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45 */ |
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46 public static const int MIDPOINT = 4; |
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47 /** The middle of the Connection */ |
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48 public static const int MIDDLE = 4; |
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49 |
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50 private Connection connection; |
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51 private int alignment; |
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52 |
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53 /** |
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54 * Constructs a ConnectionLocator with the passed connection and {@link #MIDDLE} |
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55 * alignment. |
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56 * |
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57 * @param connection The Connection |
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58 * @since 2.0 |
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59 */ |
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60 public this(Connection connection) { |
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61 this(connection, MIDDLE); |
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62 } |
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63 |
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64 /** |
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65 * Constructs a ConnectionLocator with the passed Connection and alignment. Valid values |
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66 * for the alignment are integer constants {@link #SOURCE}, {@link #MIDDLE}, and |
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67 * {@link #TARGET}. |
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68 * |
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69 * @param connection The Connection |
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70 * @param align The alignment |
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71 * |
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72 * @since 2.0 |
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73 */ |
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74 public this(Connection connection, int align_) { |
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75 setConnection(connection); |
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76 setAlignment(align_); |
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77 } |
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78 |
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79 /** |
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80 * Returns the alignment of ConnectionLocator. |
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81 * |
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82 * @return The alignment |
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83 * @since 2.0 |
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84 */ |
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85 public int getAlignment() { |
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86 return alignment; |
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87 } |
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88 |
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89 /** |
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90 * Returns connection associated with ConnectionLocator. |
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91 * |
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92 * @return The Connection |
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93 * @since 2.0 |
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94 */ |
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95 protected Connection getConnection() { |
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96 return connection; |
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97 } |
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98 |
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99 /** |
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100 * Returns ConnectionLocator's reference point in absolute coordinates. |
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101 * |
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102 * @return The reference point |
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103 * @since 2.0 |
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104 */ |
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105 protected Point getReferencePoint() { |
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106 Point p = getLocation(getConnection().getPoints()); |
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107 getConnection().translateToAbsolute(p); |
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108 return p; |
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109 } |
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110 |
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111 /** |
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112 * Returns a point from the passed PointList, dependent on ConnectionLocator's alignment. |
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113 * If the alignment is {@link #SOURCE}, it returns the first point in <i>points</i>. If |
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114 * {@link #TARGET}, it returns the last point in <i>points</i>. If {@link #MIDDLE}, it |
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115 * returns the middle of line represented by <i>points</i>. |
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116 * |
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117 * @param points The points in the Connection |
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118 * @return The location |
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119 * @since 2.0 |
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120 */ |
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121 protected Point getLocation(PointList points) { |
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122 switch (getAlignment()) { |
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123 case SOURCE: |
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124 return points.getPoint(Point.SINGLETON, 0); |
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125 case TARGET: |
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126 return points.getPoint(Point.SINGLETON, points.size() - 1); |
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127 case MIDDLE: |
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128 if (points.size() % 2 is 0) { |
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129 int i = points.size() / 2; |
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130 int j = i - 1; |
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131 Point p1 = points.getPoint(j); |
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132 Point p2 = points.getPoint(i); |
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133 Dimension d = p2.getDifference(p1); |
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134 return Point.SINGLETON.setLocation(p1.x + d.width / 2, |
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135 p1.y + d.height / 2); |
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136 } |
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137 int i = (points.size() - 1) / 2; |
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138 return points.getPoint(Point.SINGLETON, i); |
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139 default: |
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140 return new Point(); |
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141 } |
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142 } |
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143 |
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144 /** |
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145 * Sets the alignment. Possible values are {@link #SOURCE}, {@link #MIDDLE}, and |
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146 * {@link #TARGET}. |
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147 * |
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148 * @param align The alignment |
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149 * @since 2.0 |
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150 */ |
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151 protected void setAlignment(int align_) { |
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152 alignment = align_; |
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153 } |
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154 |
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155 /** |
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156 * Sets the Connection to be associated with this ConnectionLocator. |
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157 * |
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158 * @param connection The Connection |
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159 * @since 2.0 |
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160 */ |
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161 protected void setConnection(Connection connection) { |
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162 this.connection = connection; |
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163 } |
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164 |
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165 } |