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annotate dwtx/draw2d/ConnectionEndpointLocator.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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98
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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.ConnectionEndpointLocator;
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14
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15 import dwt.dwthelper.utils;
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16 import dwtx.draw2d.geometry.Dimension;
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17 import dwtx.draw2d.geometry.Point;
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18 import dwtx.draw2d.geometry.Rectangle;
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19 import dwtx.draw2d.geometry.Transposer;
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20 import dwtx.draw2d.Locator;
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21 import dwtx.draw2d.Connection;
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22 import dwtx.draw2d.IFigure;
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23
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24 /**
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25 * Used to place IFigures along the endpoint or starting point of a {@link Connection}.
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26 * <code>uDistance</code> represents the distance from the Connection's owner to the
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27 * IFigure. <code>vDistance</code> represents the distance from the IFigure to the
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28 * Connection itself.
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29 */
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30 public class ConnectionEndpointLocator
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31 : Locator
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32 {
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33
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34 private bool end;
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35 private Connection conn;
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36 private int uDistance;
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37 private int vDistance;
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38 private static Rectangle figureBounds;
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39
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40 /**
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41 * Transposes the location if the connection point is along the top or bottom of its owner
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42 * figure.
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43 */
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44 protected Transposer transposer;
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45
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46 /**
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47 * Constructs a ConnectionEndpointLocator using the given {@link Connection}. If
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48 * <i>isEnd</i> is <code>true</code>, the location is relative to the Connection's end (or
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49 * target) point. If <i>isEnd</i> is <code>false</code>, the location is relative to the
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50 * Connection's start (or source) point.
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51 *
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52 * @param c The Connection
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53 * @param isEnd <code>true</code> is location is relative to end point
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54 * @since 2.0
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55 */
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56 public this(Connection c, bool isEnd) {
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57 transposer = new Transposer();
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58 end = isEnd;
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59 conn = c;
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60 uDistance = 14;
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61 vDistance = 4;
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62 figureBounds = new Rectangle();
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63 }
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64
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65 /*
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66 * Returns an integer representing the side of the passed Rectangle that a point lies on.
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67 * 1 is Top
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68 * 2 is Right
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69 * 3 is Bottom
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70 * 4 is Left
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71 *
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72 * @param loc The point that is to be located
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73 */
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74 private int calculateConnectionLocation(Point loc, Point topLeft, Point center) {
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75 double m1, m2 = 0;
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76 m1 = cast(double)(topLeft.y - center.y) / cast(double)(topLeft.x - center.x);
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77
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78 if (loc.x - center.x !is 0)
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79 m2 = cast(double)(loc.y - center.y) / cast(double)(loc.x - center.x);
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80
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81 if (loc.x is center.x) {
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82 // Case where m2 is vertical
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83 if (loc.y < center.y)
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84 return 3;
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85 else
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86 return 1;
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87 } else if (Math.abs(m2) <= Math.abs(m1)) {
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88 // Connection start point along left or right side
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89 if (loc.x < center.x)
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90 return 4;
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91 else
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92 return 2;
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93 } else {
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94 // Connection start point along top or bottom
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95 if (loc.y < center.y)
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96 return 3;
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97 else
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98 return 1;
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99 }
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100 }
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101
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102 /*
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103 * This method is used to calculate the "quadrant" value of a connection that does not
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104 * have an owner on its starting point.
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105 *
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106 * 1 is Top
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107 * 2 is Right
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108 * 3 is Bottom
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109 * 4 is Left
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110 *
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111 * @param startPoint The starting point of the connection.
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112 * @param endPoint The end point of the connection.
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113 */
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114 private int calculateConnectionLocation(Point startPoint, Point endPoint) {
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115 if (Math.abs(endPoint.x - startPoint.x) > Math.abs(endPoint.y - startPoint.y)) {
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116 if (endPoint.x > startPoint.x)
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117 return 2;
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118 else
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119 return 4;
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120 } else {
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121 if (endPoint.y > startPoint.y)
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122 return 1;
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123 else
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124 return 3;
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125 }
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126 }
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127
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128 /*
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129 * Calculates 'tan' which is used as a factor for y adjustment when placing the connection
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130 * label. 'tan' is capped at 1.0 in the positive direction and -1.0 in the negative
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131 * direction.
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132 *
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133 * @param startPoint The starting point of the connection.
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134 * @param endPoint The end point of the connection.
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135 * @since 2.0
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136 */
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137 private double calculateTan(Point startPoint, Point endPoint) {
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138 double tan = 0;
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139 if (endPoint.x is startPoint.x)
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140 tan = 1.0;
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141 else
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142 tan = cast(double)(endPoint.y - startPoint.y)
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143 / cast(double)(endPoint.x - startPoint.x);
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144 if (tan > 1)
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145 tan = 1.0;
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146 else if (tan < -1)
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147 tan = -1.0;
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148
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149 return tan;
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150 }
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151
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152 private int calculateYShift(int figureWidth, int figureHeight) {
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153 int yShift = 0;
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154 if (vDistance < 0)
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155 yShift = -figureHeight;
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156 else if (vDistance is 0)
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157 yShift = -figureHeight / 2;
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158 return yShift;
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159 }
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160
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161 private Connection getConnection() {
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162 return conn;
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163 }
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164
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165 private IFigure getConnectionOwner() {
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166 IFigure connOwner;
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167 if (isEnd())
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168 connOwner = conn.getTargetAnchor().getOwner();
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169 else
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170 connOwner = conn.getSourceAnchor().getOwner();
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171
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172 return connOwner;
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173 }
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174
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175 /**
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176 * Returns the distance in pixels from the anchor's owner.
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177 * @return the offset distance from the endpoint figure
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178 */
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179 public int getUDistance() {
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180 return uDistance;
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181 }
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182
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183 /**
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184 * Returns the distance in pixels from the connection
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185 * @return the offset from the connection itself
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186 */
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187 public int getVDistance() {
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188 return vDistance;
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189 }
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190
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191 private bool isEnd() {
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192 return end;
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193 }
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194
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195 /**
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196 * Relocates the given IFigure at either the source or target end of the Connection,
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197 * based on the <code>bool</code> given in the constructor
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198 * {@link #ConnectionEndpointLocator(Connection, bool)}.
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199 *
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200 * @param figure The figure to relocate
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201 */
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202 public void relocate(IFigure figure) {
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203 Connection conn = getConnection();
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204 Point startPoint = Point.SINGLETON;
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205 Point endPoint = new Point();
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206
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207 int startPointPosition = 0;
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208 int endPointPosition = 1;
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209 if (isEnd()) {
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210 startPointPosition = conn.getPoints().size() - 1;
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211 endPointPosition = startPointPosition - 1;
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212 }
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213
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214 conn.getPoints().getPoint(startPoint, startPointPosition);
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215 conn.getPoints().getPoint(endPoint, endPointPosition);
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216
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217 IFigure connOwner = getConnectionOwner();
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218
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219 int quadrant;
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220 if (connOwner !is null) {
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221 Rectangle connOwnerBounds = connOwner.getBounds();
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222 Point connOwnerCenter = connOwnerBounds.getCenter();
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223 Point connOwnerTL = connOwnerBounds.getTopLeft();
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224 quadrant = calculateConnectionLocation(startPoint, connOwnerTL, connOwnerCenter);
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225 } else
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226 quadrant = calculateConnectionLocation(startPoint, endPoint);
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227
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228 int cos = 1;
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229 transposer.setEnabled(false);
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230
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231 /*
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232 * Label placement calculations are done as if the connection point is along the left
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233 * or right side of the figure. If the connection point is along the top or bottom,
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234 * values are transposed.
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235 */
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236 if (quadrant is 1 || quadrant is 3)
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237 transposer.setEnabled(true);
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238
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239 if (quadrant is 3 || quadrant is 4)
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240 cos = -1;
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241
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242 Dimension figureSize = transposer.t(figure.getPreferredSize());
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243 startPoint = transposer.t(startPoint);
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244 endPoint = transposer.t(endPoint);
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245
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246 double tan = calculateTan(startPoint, endPoint);
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247
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248 int figureWidth = figureSize.width;
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249 int figureHeight = figureSize.height;
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250 int yShift = calculateYShift(figureWidth, figureHeight);
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251
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252 Point figurePoint =
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253 new Point(startPoint.x + (uDistance * cos) + figureWidth * ((cos - 1) / 2),
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254 cast(int)(startPoint.y + cos * uDistance * tan + vDistance + yShift));
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255
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256 figureBounds.setSize(transposer.t(figureSize));
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257 figureBounds.setLocation(transposer.t(figurePoint));
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258 figure.setBounds(figureBounds);
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259 }
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260
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261 /**
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262 * Sets the distance in pixels from the Connection's owner.
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263 *
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264 * @param distance Number of pixels to place the ConnectionEndpointLocator from its owner.
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265 * @since 2.0
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266 */
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267 public void setUDistance(int distance) {
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268 uDistance = distance;
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269 }
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270
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271 /**
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272 * Sets the distance in pixels from the Connection.
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273 *
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274 * @param distance Number of pixels to place the ConnectionEndpointLocator from its
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275 * Connection.
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276 * @since 2.0
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277 */
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278 public void setVDistance(int distance) {
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279 vDistance = distance;
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280 }
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281
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282 }