1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.actions;
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3 |
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4 | import static org.openstreetmap.josm.gui.help.HelpUtil.ht;
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5 | import static org.openstreetmap.josm.tools.I18n.tr;
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6 |
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7 | import java.awt.event.ActionEvent;
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8 | import java.awt.event.KeyEvent;
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9 | import java.io.Serializable;
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10 | import java.util.ArrayList;
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11 | import java.util.Arrays;
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12 | import java.util.Collection;
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13 | import java.util.Collections;
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14 | import java.util.Comparator;
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15 | import java.util.LinkedList;
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16 | import java.util.List;
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17 |
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18 | import javax.swing.JOptionPane;
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19 |
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20 | import org.openstreetmap.josm.Main;
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21 | import org.openstreetmap.josm.command.AddCommand;
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22 | import org.openstreetmap.josm.command.ChangeCommand;
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23 | import org.openstreetmap.josm.command.Command;
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24 | import org.openstreetmap.josm.command.SequenceCommand;
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25 | import org.openstreetmap.josm.data.coor.EastNorth;
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26 | import org.openstreetmap.josm.data.coor.LatLon;
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27 | import org.openstreetmap.josm.data.coor.PolarCoor;
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28 | import org.openstreetmap.josm.data.osm.DataSet;
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29 | import org.openstreetmap.josm.data.osm.Node;
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30 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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31 | import org.openstreetmap.josm.data.osm.Way;
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32 | import org.openstreetmap.josm.gui.MainApplication;
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33 | import org.openstreetmap.josm.gui.Notification;
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34 | import org.openstreetmap.josm.tools.Geometry;
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35 | import org.openstreetmap.josm.tools.RightAndLefthandTraffic;
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36 | import org.openstreetmap.josm.tools.Shortcut;
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37 |
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38 | /**
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39 | * - Create a new circle from two selected nodes or a way with 2 nodes which represent the diameter of the circle.
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40 | * - Create a new circle from three selected nodes--or a way with 3 nodes.
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41 | * - Useful for roundabouts
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42 | *
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43 | * Notes:
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44 | * * If a way is selected, it is changed. If nodes are selected a new way is created.
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45 | * So if you've got a way with nodes it makes a difference between running this on the way or the nodes!
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46 | * * The existing nodes are retained, and additional nodes are inserted regularly
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47 | * to achieve the desired number of nodes (`createcircle.nodecount`).
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48 | * BTW: Someone might want to implement projection corrections for this...
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49 | *
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50 | * @author Henry Loenwind
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51 | * @author Sebastian Masch
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52 | * @author Alain Delplanque
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53 | *
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54 | * @since 996
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55 | */
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56 | public final class CreateCircleAction extends JosmAction {
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57 |
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58 | /**
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59 | * Constructs a new {@code CreateCircleAction}.
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60 | */
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61 | public CreateCircleAction() {
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62 | super(tr("Create Circle"), "aligncircle", tr("Create a circle from three selected nodes."),
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63 | Shortcut.registerShortcut("tools:createcircle", tr("Tool: {0}", tr("Create Circle")),
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64 | KeyEvent.VK_O, Shortcut.SHIFT), true, "createcircle", true);
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65 | putValue("help", ht("/Action/CreateCircle"));
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66 | }
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67 |
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68 | /**
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69 | * Distributes nodes according to the algorithm of election with largest remainder.
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70 | * @param angles Array of PolarNode ordered by increasing angles
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71 | * @param nodesCount Number of nodes to be distributed
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72 | * @return Array of number of nodes to put in each arc
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73 | */
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74 | private static int[] distributeNodes(PolarNode[] angles, int nodesCount) {
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75 | int[] count = new int[angles.length];
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76 | double[] width = new double[angles.length];
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77 | double[] remainder = new double[angles.length];
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78 | for (int i = 0; i < angles.length; i++) {
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79 | width[i] = angles[(i+1) % angles.length].a - angles[i].a;
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80 | if (width[i] < 0)
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81 | width[i] += 2*Math.PI;
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82 | }
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83 | int assign = 0;
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84 | for (int i = 0; i < angles.length; i++) {
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85 | double part = width[i] / 2.0 / Math.PI * nodesCount;
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86 | count[i] = (int) Math.floor(part);
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87 | remainder[i] = part - count[i];
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88 | assign += count[i];
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89 | }
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90 | while (assign < nodesCount) {
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91 | int imax = 0;
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92 | for (int i = 1; i < angles.length; i++) {
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93 | if (remainder[i] > remainder[imax])
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94 | imax = i;
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95 | }
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96 | count[imax]++;
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97 | remainder[imax] = 0;
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98 | assign++;
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99 | }
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100 | return count;
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101 | }
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102 |
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103 | /**
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104 | * Class designed to create a couple between a node and its angle relative to the center of the circle.
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105 | */
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106 | private static class PolarNode {
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107 | private final double a;
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108 | private final Node node;
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109 |
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110 | PolarNode(EastNorth center, Node n) {
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111 | this.a = PolarCoor.computeAngle(n.getEastNorth(), center);
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112 | this.node = n;
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113 | }
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114 | }
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115 |
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116 | /**
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117 | * Comparator used to order PolarNode relative to their angle.
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118 | */
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119 | private static class PolarNodeComparator implements Comparator<PolarNode>, Serializable {
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120 | private static final long serialVersionUID = 1L;
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121 |
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122 | @Override
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123 | public int compare(PolarNode pc1, PolarNode pc2) {
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124 | return Double.compare(pc1.a, pc2.a);
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125 | }
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126 | }
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127 |
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128 | @Override
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129 | public void actionPerformed(ActionEvent e) {
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130 | if (!isEnabled())
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131 | return;
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132 |
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133 | DataSet ds = getLayerManager().getEditDataSet();
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134 | Collection<OsmPrimitive> sel = ds.getSelected();
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135 | List<Node> nodes = OsmPrimitive.getFilteredList(sel, Node.class);
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136 | List<Way> ways = OsmPrimitive.getFilteredList(sel, Way.class);
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137 |
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138 | Way existingWay = null;
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139 |
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140 | // special case if no single nodes are selected and exactly one way is:
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141 | // then use the way's nodes
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142 | if (nodes.isEmpty() && (ways.size() == 1)) {
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143 | existingWay = ways.get(0);
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144 | for (Node n : existingWay.getNodes()) {
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145 | if (!nodes.contains(n)) {
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146 | nodes.add(n);
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147 | }
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148 | }
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149 | }
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150 |
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151 | if (nodes.size() < 2 || nodes.size() > 3) {
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152 | new Notification(
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153 | tr("Please select exactly two or three nodes or one way with exactly two or three nodes."))
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154 | .setIcon(JOptionPane.INFORMATION_MESSAGE)
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155 | .setDuration(Notification.TIME_LONG)
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156 | .show();
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157 | return;
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158 | }
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159 |
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160 | EastNorth center;
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161 |
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162 | if (nodes.size() == 2) {
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163 | // diameter: two single nodes needed or a way with two nodes
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164 | EastNorth n1 = nodes.get(0).getEastNorth();
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165 | EastNorth n2 = nodes.get(1).getEastNorth();
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166 |
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167 | center = n1.getCenter(n2);
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168 | } else {
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169 | // triangle: three single nodes needed or a way with three nodes
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170 | center = Geometry.getCenter(nodes);
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171 | if (center == null) {
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172 | notifyNodesNotOnCircle();
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173 | return;
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174 | }
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175 | }
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176 |
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177 | // calculate the radius (r)
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178 | EastNorth n1 = nodes.get(0).getEastNorth();
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179 | double r = n1.distance(center);
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180 |
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181 | // see #10777
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182 | LatLon ll1 = Main.getProjection().eastNorth2latlon(n1);
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183 | LatLon ll2 = Main.getProjection().eastNorth2latlon(center);
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184 |
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185 | double radiusInMeters = ll1.greatCircleDistance(ll2);
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186 |
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187 | int numberOfNodesInCircle = (int) Math.ceil(6.0 * Math.pow(radiusInMeters, 0.5));
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188 | // an odd number of nodes makes the distribution uneven
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189 | if ((numberOfNodesInCircle % 2) == 1) {
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190 | // add 1 to make it even
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191 | numberOfNodesInCircle += 1;
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192 | }
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193 | if (numberOfNodesInCircle < 6) {
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194 | numberOfNodesInCircle = 6;
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195 | }
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196 |
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197 | // Order nodes by angle
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198 | PolarNode[] angles = new PolarNode[nodes.size()];
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199 | for (int i = 0; i < nodes.size(); i++) {
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200 | angles[i] = new PolarNode(center, nodes.get(i));
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201 | }
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202 | Arrays.sort(angles, new PolarNodeComparator());
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203 | int[] count = distributeNodes(angles,
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204 | numberOfNodesInCircle >= nodes.size() ? (numberOfNodesInCircle - nodes.size()) : 0);
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205 |
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206 | // now we can start doing things to OSM data
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207 | Collection<Command> cmds = new LinkedList<>();
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208 |
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209 | // build a way for the circle
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210 | List<Node> nodesToAdd = new ArrayList<>();
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211 | for (int i = 0; i < nodes.size(); i++) {
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212 | nodesToAdd.add(angles[i].node);
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213 | double delta = angles[(i+1) % nodes.size()].a - angles[i].a;
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214 | if (delta < 0)
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215 | delta += 2*Math.PI;
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216 | for (int j = 0; j < count[i]; j++) {
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217 | double alpha = angles[i].a + (j+1)*delta/(count[i]+1);
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218 | double x = center.east() + r*Math.cos(alpha);
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219 | double y = center.north() + r*Math.sin(alpha);
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220 | LatLon ll = Main.getProjection().eastNorth2latlon(new EastNorth(x, y));
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221 | if (ll.isOutSideWorld()) {
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222 | notifyNodesNotOnCircle();
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223 | return;
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224 | }
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225 | Node n = new Node(ll);
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226 | nodesToAdd.add(n);
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227 | cmds.add(new AddCommand(ds, n));
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228 | }
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229 | }
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230 | nodesToAdd.add(nodesToAdd.get(0)); // close the circle
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231 | if (existingWay != null && existingWay.getNodesCount() >= 3) {
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232 | nodesToAdd = orderNodesByWay(nodesToAdd, existingWay);
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233 | } else {
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234 | nodesToAdd = orderNodesByTrafficHand(nodesToAdd);
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235 | }
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236 | if (existingWay == null) {
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237 | Way newWay = new Way();
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238 | newWay.setNodes(nodesToAdd);
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239 | cmds.add(new AddCommand(ds, newWay));
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240 | } else {
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241 | Way newWay = new Way(existingWay);
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242 | newWay.setNodes(nodesToAdd);
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243 | cmds.add(new ChangeCommand(ds, existingWay, newWay));
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244 | }
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245 |
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246 | MainApplication.undoRedo.add(new SequenceCommand(tr("Create Circle"), cmds));
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247 | }
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248 |
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249 | /**
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250 | * Order nodes according to left/right hand traffic.
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251 | * @param nodes Nodes list to be ordered.
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252 | * @return Modified nodes list ordered according hand traffic.
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253 | */
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254 | private static List<Node> orderNodesByTrafficHand(List<Node> nodes) {
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255 | boolean rightHandTraffic = true;
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256 | for (Node n: nodes) {
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257 | if (!RightAndLefthandTraffic.isRightHandTraffic(n.getCoor())) {
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258 | rightHandTraffic = false;
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259 | break;
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260 | }
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261 | }
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262 | if (rightHandTraffic == Geometry.isClockwise(nodes)) {
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263 | Collections.reverse(nodes);
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264 | }
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265 | return nodes;
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266 | }
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267 |
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268 | /**
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269 | * Order nodes according to way direction.
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270 | * @param nodes Nodes list to be ordered.
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271 | * @param way Way used to determine direction.
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272 | * @return Modified nodes list with same direction as way.
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273 | */
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274 | private static List<Node> orderNodesByWay(List<Node> nodes, Way way) {
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275 | List<Node> wayNodes = way.getNodes();
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276 | if (!way.isClosed()) {
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277 | wayNodes.add(wayNodes.get(0));
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278 | }
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279 | if (Geometry.isClockwise(wayNodes) != Geometry.isClockwise(nodes)) {
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280 | Collections.reverse(nodes);
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281 | }
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282 | return nodes;
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283 | }
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284 |
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285 | private static void notifyNodesNotOnCircle() {
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286 | new Notification(
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287 | tr("Those nodes are not in a circle. Aborting."))
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288 | .setIcon(JOptionPane.WARNING_MESSAGE)
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289 | .show();
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290 | }
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291 |
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292 | @Override
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293 | protected void updateEnabledState() {
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294 | updateEnabledStateOnCurrentSelection();
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295 | }
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296 |
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297 | @Override
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298 | protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
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299 | setEnabled(selection != null && !selection.isEmpty());
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300 | }
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301 | }
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