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annotate dwtx/draw2d/AutomaticRouter.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.AutomaticRouter;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.dwtxhelper.Collection;
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17
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18 import dwtx.draw2d.geometry.Point;
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19 import dwtx.draw2d.geometry.PointList;
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20 import dwtx.draw2d.internal.MultiValueMap;
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21 import dwtx.draw2d.AbstractRouter;
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22 import dwtx.draw2d.ConnectionRouter;
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23 import dwtx.draw2d.ConnectionAnchor;
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24 import dwtx.draw2d.Connection;
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25
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26 /**
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27 * An abstract router implementation which detects when multiple connections are
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28 * overlapping. Two connections overlap if the combination of source and target
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29 * anchors are equal. Subclasses must implement {@link #handleCollision(PointList, int)}
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30 * to determine how to avoid the overlap.
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31 * <p>
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32 * This router can delegate to another connection router. The wrappered router will route
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33 * the connections first, after which overlapping will be determined.
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34 */
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35 public abstract class AutomaticRouter
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36 : AbstractRouter
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37 {
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38
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39 private ConnectionRouter nextRouter;
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40 private MultiValueMap connections;
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41
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42 public this(){
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43 connections = new MultiValueMap();
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44 }
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45
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46 private class HashKey {
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47
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48 private ConnectionAnchor anchor1, anchor2;
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49
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50 this(Connection conn) {
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51 anchor1 = conn.getSourceAnchor();
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52 anchor2 = conn.getTargetAnchor();
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53 }
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54
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55 public override int opEquals(Object object) {
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56 bool isEqual = false;
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57 HashKey hashKey;
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58
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59 if (auto hashKey = cast(HashKey)object ) {
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60 ConnectionAnchor hkA1 = hashKey.getFirstAnchor();
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61 ConnectionAnchor hkA2 = hashKey.getSecondAnchor();
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62
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63 isEqual = ((cast(Object)hkA1).opEquals(cast(Object)anchor1) && (cast(Object)hkA2).opEquals(cast(Object)anchor2))
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64 || ((cast(Object)hkA1).opEquals(cast(Object)anchor2) && (cast(Object)hkA2).opEquals(cast(Object)anchor1));
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65 }
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66 return isEqual;
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67 }
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68
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69 public ConnectionAnchor getFirstAnchor() {
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70 return anchor1;
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71 }
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72
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73 public ConnectionAnchor getSecondAnchor() {
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74 return anchor2;
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75 }
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76
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77 public override hash_t toHash() {
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78 return (cast(Object)anchor1).toHash() ^ (cast(Object)anchor2).toHash();
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79 }
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80 }
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81
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82 /**
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83 * @see dwtx.draw2d.ConnectionRouter#getConstraint(Connection)
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84 */
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85 public Object getConstraint(Connection connection) {
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86 if (next() !is null)
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87 return next().getConstraint(connection);
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88 return null;
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89 }
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90
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91 /**
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92 * Handles collisions between 2 or more Connections. Collisions are currently defined as 2
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93 * connections with no bendpoints and whose start and end points coincide. In other
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94 * words, the 2 connections are the exact same line.
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95 *
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96 * @param list The PointList of a connection that collides with another connection
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97 * @param index The index of the current connection in the list of colliding connections
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98 */
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99 protected abstract void handleCollision(PointList list, int index);
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100
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101 /**
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102 * @see dwtx.draw2d.ConnectionRouter#invalidate(Connection)
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103 */
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104 public void invalidate(Connection conn) {
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105 if (next() !is null)
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106 next().invalidate(conn);
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107 if (conn.getSourceAnchor() is null || conn.getTargetAnchor() is null)
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108 return;
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109 HashKey connectionKey = new HashKey(conn);
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110 ArrayList connectionList = connections.get(connectionKey);
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111 int affected = connections.remove(connectionKey, cast(Object)conn);
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112 if (affected !is -1) {
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113 for (int i = affected; i < connectionList.size(); i++)
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114 (cast(Connection)connectionList.get(i)).revalidate();
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115 } else
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116 connections.removeValue(cast(Object)conn);
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117
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118 }
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119
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120 /**
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121 * Returns the next router in the chain.
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122 * @return The next router
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123 * @since 2.0
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124 */
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125 protected ConnectionRouter next() {
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126 return nextRouter;
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127 }
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128
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129
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130
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131 /**
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132 * @see dwtx.draw2d.ConnectionRouter#remove(Connection)
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133 */
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134 public void remove(Connection conn) {
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135 if (conn.getSourceAnchor() is null || conn.getTargetAnchor() is null)
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136 return;
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137 HashKey connectionKey = new HashKey(conn);
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138 ArrayList connectionList = connections.get(connectionKey);
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139 if (connectionList !is null) {
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140 int index = connections.remove(connectionKey,cast(Object) conn);
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141 for (int i = index + 1; i < connectionList.size(); i++)
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142 (cast(Connection)connectionList.get(i)).revalidate();
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143 }
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144 if (next() !is null)
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145 next().remove(conn);
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146 }
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147
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148 /**
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149 * Routes the given connection. Calls the 'next' router first (if one exists) and if no
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150 * bendpoints were added by the next router, collisions are dealt with by calling
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151 * {@link #handleCollision(PointList, int)}.
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152 * @param conn The connection to route
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153 */
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154 public void route(Connection conn) {
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155 if (next() !is null)
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156 next().route(conn);
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157 else {
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158 conn.getPoints().removeAllPoints();
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159 setEndPoints(conn);
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160 }
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161
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162 if (conn.getPoints().size() is 2) {
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163 PointList points = conn.getPoints();
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164 HashKey connectionKey = new HashKey(conn);
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165 ArrayList connectionList = connections.get(connectionKey);
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166
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167 if (connectionList !is null) {
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168
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169 int index;
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170
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171 if (connectionList.contains(cast(Object)conn)) {
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172 index = connectionList.indexOf(cast(Object)conn) + 1;
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173 } else {
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174 index = connectionList.size() + 1;
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175 connections.put(connectionKey, cast(Object)conn);
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176 }
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177
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178 handleCollision(points, index);
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179 conn.setPoints(points);
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180 } else {
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181 connections.put(connectionKey, cast(Object)conn);
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182 }
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183 }
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184 }
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185
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186 /**
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187 * An AutomaticRouter needs no constraints for the connections it routes. This method
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188 * invalidates the connections and calls {@link #setConstraint(Connection, Object)} on the
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189 * {@link #next()} router.
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190 * @see dwtx.draw2d.ConnectionRouter#setConstraint(Connection, Object)
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191 */
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192 public void setConstraint(Connection connection, Object constraint) {
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193 invalidate(connection);
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194 if (next() !is null)
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195 next().setConstraint(connection, constraint);
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196 }
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197
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198 /**
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199 * Sets the start and end points for the given connection.
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200 * @param conn The connection
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201 */
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202 protected void setEndPoints(Connection conn) {
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203 PointList points = conn.getPoints();
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204 points.removeAllPoints();
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205 Point start = getStartPoint(conn);
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206 Point end = getEndPoint(conn);
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207 conn.translateToRelative(start);
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208 conn.translateToRelative(end);
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209 points.addPoint(start);
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210 points.addPoint(end);
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211 conn.setPoints(points);
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212 }
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213
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214 /**
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215 * Sets the next router.
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216 * @param router The ConnectionRouter
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217 * @since 2.0
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218 */
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219 public void setNextRouter(ConnectionRouter router) {
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220 nextRouter = router;
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221 }
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222
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223 }