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annotate org.eclipse.draw2d/src/org/eclipse/draw2d/RoutingAnimator.d @ 12:bc29606a740c

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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) 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
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14 module org.eclipse.draw2d.RoutingAnimator;
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15
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16 import java.lang.all;
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17
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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.Animator;
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21 import org.eclipse.draw2d.RoutingListener;
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22 import org.eclipse.draw2d.IFigure;
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23 import org.eclipse.draw2d.Connection;
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24 import org.eclipse.draw2d.Animation;
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25
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26 /**
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27 * Animates the routing of a connection. The animator will capture the effects of the
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28 * connection's router, and the play back the placement of the routing, interpolating the
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29 * intermediate routes.
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30 * <P>
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31 * To use a routing animator, hook it as a routing listener for the connection whose
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32 * points are to be animated, by calling {@link
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33 * PolylineConnection#addRoutingListener(RoutingListener)}. An animator is active
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34 * only when the Animation utility is activated.
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35 *
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36 * @since 3.2
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37 */
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38 public class RoutingAnimator : Animator , RoutingListener {
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39
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40 private static RoutingAnimator INSTANCE_;
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41 static RoutingAnimator INSTANCE(){
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42 if( INSTANCE_ is null ){
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43 synchronized( RoutingAnimator.classinfo ){
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44 if( INSTANCE_ is null ){
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45 INSTANCE_ = new RoutingAnimator();
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46 }
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47 }
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48 }
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49 return INSTANCE_;
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50 }
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51
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52 /**
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53 * Constructs a routing animator for use with one or more connections. The default
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54 * instance ({@link #getDefault()} can be used on any number of connections.
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55 *
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56 * @since 3.2
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57 */
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58 protected this() { }
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59
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60 /**
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61 * Overridden to sync initial and final states.
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62 * @see Animator#playbackStarting(IFigure)
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63 */
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64 public void playbackStarting(IFigure connection) {
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65 reconcileStates(cast(Connection)connection);
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66 }
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67
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68 /**
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69 * Returns the current state of the connection. Currently, this is a copy of the list of
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70 * points. However this Object could change in future releases and should not be
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71 * considered API.
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72 * @see Animator#getCurrentState(IFigure)
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73 */
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74 protected Object getCurrentState(IFigure connection) {
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75 return (cast(Connection)connection).getPoints().getCopy();
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76 }
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77
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78 /**
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79 * Returns the default instance.
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80 * @return the default instance
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81 * @since 3.2
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82 */
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83 public static RoutingAnimator getDefault() {
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84 return INSTANCE;
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85 }
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86
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87 /**
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88 * Hooks invalidate for animation purposes.
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89 * @see RoutingListener#invalidate(Connection)
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90 */
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91 public final void invalidate(Connection conn) {
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92 if (Animation.isInitialRecording())
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93 Animation.hookAnimator(conn, this);
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94 }
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95
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96 /**
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97 * Plays back the interpolated state.
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98 * @see Animator#playback(IFigure)
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99 */
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100 protected bool playback(IFigure figure) {
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101 Connection conn = cast(Connection) figure;
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102
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103 PointList list1 = cast(PointList)Animation.getInitialState(this, conn);
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104 PointList list2 = cast(PointList)Animation.getFinalState(this, conn);
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105 if (list1 is null) {
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106 conn.setVisible(false);
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107 return true;
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108 }
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109
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110 float progress = Animation.getProgress();
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111 if (list1.size() is list2.size()) {
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112 Point pt1 = new Point(), pt2 = new Point();
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113 PointList points = conn.getPoints();
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114 points.removeAllPoints();
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115 for (int i = 0; i < list1.size(); i++) {
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116 list1.getPoint(pt2, i);
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117 list2.getPoint(pt1, i);
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118 pt1.x = cast(int)Math.round(pt1.x * progress + (1 - progress) * pt2.x);
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119 pt1.y = cast(int)Math.round(pt1.y * progress + (1 - progress) * pt2.y);
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120 points.addPoint(pt1);
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121 }
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122 conn.setPoints(points);
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123 }
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124 return true;
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125 }
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126
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127 /**
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128 * Hooks post routing for animation purposes.
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129 * @see RoutingListener#postRoute(Connection)
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130 */
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131 public final void postRoute(Connection connection) {
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132 if (Animation.isFinalRecording())
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133 Animation.hookNeedsCapture(connection, this);
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134 }
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135
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136 private void reconcileStates(Connection conn) {
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137 PointList points1 = cast(PointList)Animation.getInitialState(this, conn);
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138 PointList points2 = cast(PointList)Animation.getFinalState(this, conn);
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139
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140 if (points1 !is null && points1.size() !is points2.size()) {
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141 Point p = new Point(), q = new Point();
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142
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143 int size1 = points1.size() - 1;
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144 int size2 = points2.size() - 1;
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145
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146 int i1 = size1;
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147 int i2 = size2;
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148
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149 double current1 = 1.0;
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150 double current2 = 1.0;
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151
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152 double prev1 = 1.0;
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153 double prev2 = 1.0;
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154
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155 while (i1 > 0 || i2 > 0) {
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156 if (Math.abs(current1 - current2) < 0.1
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157 && i1 > 0 && i2 > 0) {
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158 //Both points are the same, use them and go on;
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159 prev1 = current1;
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160 prev2 = current2;
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161 i1--;
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162 i2--;
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163 current1 = cast(double)i1 / size1;
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164 current2 = cast(double)i2 / size2;
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165 } else if (current1 < current2) {
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166 //2 needs to catch up
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167 // current1 < current2 < prev1
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168 points1.getPoint(p, i1);
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169 points1.getPoint(q, i1 + 1);
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170
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171 p.x = cast(int)(((q.x * (current2 - current1) + p.x * (prev1 - current2))
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172 / (prev1 - current1)));
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173 p.y = cast(int)(((q.y * (current2 - current1) + p.y * (prev1 - current2))
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174 / (prev1 - current1)));
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175
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176 points1.insertPoint(p, i1 + 1);
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177
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178 prev1 = prev2 = current2;
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179 i2--;
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180 current2 = cast(double)i2 / size2;
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181
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182 } else {
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183 //1 needs to catch up
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184 // current2< current1 < prev2
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185
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186 points2.getPoint(p, i2);
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187 points2.getPoint(q, i2 + 1);
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188
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189 p.x = cast(int)(((q.x * (current1 - current2) + p.x * (prev2 - current1))
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190 / (prev2 - current2)));
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191 p.y = cast(int)(((q.y * (current1 - current2) + p.y * (prev2 - current1))
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192 / (prev2 - current2)));
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193
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194 points2.insertPoint(p, i2 + 1);
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195
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196 prev2 = prev1 = current1;
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197 i1--;
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198 current1 = cast(double)i1 / size1;
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199 }
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200 }
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201 }
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202 }
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203
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204 /**
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205 * This callback is unused. Reserved for possible future use.
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206 * @see RoutingListener#remove(Connection)
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207 */
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208 public final void remove(Connection connection) { }
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209
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210 /**
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211 * Hooks route to intercept routing during animation playback.
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212 * @see RoutingListener#route(Connection)
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213 */
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214 public final bool route(Connection conn) {
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215 return Animation.isAnimating() && Animation.hookPlayback(conn, this);
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216 }
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217
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218 /**
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219 * This callback is unused. Reserved for possible future use.
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220 * @see RoutingListener#setConstraint(Connection, Object)
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221 */
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222 public final void setConstraint(Connection connection, Object constraint) { }
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223
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224 }