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.util.ArrayList;
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10 | import java.util.Collection;
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11 | import java.util.Collections;
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12 | import java.util.HashSet;
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13 | import java.util.LinkedList;
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14 | import java.util.List;
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15 | import java.util.Set;
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16 |
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17 | import javax.swing.JOptionPane;
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18 |
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19 | import org.openstreetmap.josm.command.Command;
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20 | import org.openstreetmap.josm.command.MoveCommand;
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21 | import org.openstreetmap.josm.command.SequenceCommand;
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22 | import org.openstreetmap.josm.data.UndoRedoHandler;
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23 | import org.openstreetmap.josm.data.coor.EastNorth;
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24 | import org.openstreetmap.josm.data.coor.PolarCoor;
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25 | import org.openstreetmap.josm.data.osm.DataSet;
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26 | import org.openstreetmap.josm.data.osm.Node;
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27 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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28 | import org.openstreetmap.josm.data.osm.Way;
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29 | import org.openstreetmap.josm.gui.Notification;
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30 | import org.openstreetmap.josm.tools.Geometry;
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31 | import org.openstreetmap.josm.tools.Shortcut;
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32 |
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33 | /**
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34 | * Aligns all selected nodes within a circle. (Useful for roundabouts)
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35 | *
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36 | * @author Matthew Newton
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37 | * @author Petr Dlouhý
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38 | * @author Teemu Koskinen
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39 | * @author Alain Delplanque
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40 | *
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41 | * @since 146
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42 | */
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43 | public final class AlignInCircleAction extends JosmAction {
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44 |
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45 | /**
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46 | * Constructs a new {@code AlignInCircleAction}.
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47 | */
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48 | public AlignInCircleAction() {
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49 | super(tr("Align Nodes in Circle"), "aligncircle", tr("Move the selected nodes into a circle."),
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50 | Shortcut.registerShortcut("tools:aligncircle", tr("Tool: {0}", tr("Align Nodes in Circle")),
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51 | KeyEvent.VK_O, Shortcut.DIRECT), true);
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52 | setHelpId(ht("/Action/AlignInCircle"));
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53 | }
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54 |
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55 | /**
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56 | * Create a {@link MoveCommand} to move a node to a PolarCoor.
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57 | * @param n Node to move
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58 | * @param coor polar coordinate where to move the node
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59 | * @return new MoveCommand
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60 | * @since 13107
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61 | */
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62 | public static MoveCommand createMoveCommand(Node n, PolarCoor coor) {
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63 | EastNorth en = coor.toEastNorth();
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64 | return new MoveCommand(n, en.east() - n.getEastNorth().east(), en.north() - n.getEastNorth().north());
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65 | }
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66 |
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67 | /**
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68 | * Perform AlignInCircle action.
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69 | *
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70 | * A fixed node is a node for which it is forbidden to change the angle relative to center of the circle.
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71 | * All other nodes are uniformly distributed.
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72 | *
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73 | * Case 1: One unclosed way.
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74 | * --> allow action, and align selected way nodes
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75 | * If nodes contained by this way are selected, there are fix.
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76 | * If nodes outside from the way are selected there are ignored.
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77 | *
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78 | * Case 2: One or more ways are selected and can be joined into a polygon
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79 | * --> allow action, and align selected ways nodes
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80 | * If 1 node outside of way is selected, it became center
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81 | * If 1 node outside and 1 node inside are selected there define center and radius
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82 | * If no outside node and 2 inside nodes are selected those 2 nodes define diameter
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83 | * In all other cases outside nodes are ignored
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84 | * In all cases, selected nodes are fix, nodes with more than one referrers are fix
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85 | * (first referrer is the selected way)
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86 | *
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87 | * Case 3: Only nodes are selected
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88 | * --> Align these nodes, all are fix
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89 | */
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90 | @Override
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91 | public void actionPerformed(ActionEvent e) {
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92 | if (!isEnabled())
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93 | return;
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94 |
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95 | Collection<OsmPrimitive> sel = getLayerManager().getEditDataSet().getSelected();
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96 | List<Node> nodes = new LinkedList<>();
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97 | // fixNodes: All nodes for which the angle relative to center should not be modified
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98 | Set<Node> fixNodes = new HashSet<>();
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99 | List<Way> ways = new LinkedList<>();
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100 | EastNorth center = null;
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101 | double radius = 0;
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102 |
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103 | for (OsmPrimitive osm : sel) {
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104 | if (osm instanceof Node) {
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105 | nodes.add((Node) osm);
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106 | } else if (osm instanceof Way) {
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107 | ways.add((Way) osm);
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108 | }
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109 | }
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110 |
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111 | if (ways.size() == 1 && !ways.get(0).isClosed()) {
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112 | // Case 1
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113 | Way w = ways.get(0);
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114 | fixNodes.add(w.firstNode());
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115 | fixNodes.add(w.lastNode());
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116 | fixNodes.addAll(nodes);
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117 | fixNodes.addAll(collectNodesWithExternReferers(ways));
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118 | // Temporary closed way used to reorder nodes
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119 | Way closedWay = new Way(w);
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120 | closedWay.addNode(w.firstNode());
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121 | List<Way> usedWays = new ArrayList<>(1);
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122 | usedWays.add(closedWay);
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123 | nodes = collectNodesAnticlockwise(usedWays);
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124 | } else if (!ways.isEmpty() && checkWaysArePolygon(ways)) {
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125 | // Case 2
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126 | List<Node> inside = new ArrayList<>();
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127 | List<Node> outside = new ArrayList<>();
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128 |
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129 | for (Node n: nodes) {
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130 | boolean isInside = false;
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131 | for (Way w: ways) {
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132 | if (w.getNodes().contains(n)) {
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133 | isInside = true;
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134 | break;
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135 | }
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136 | }
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137 | if (isInside)
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138 | inside.add(n);
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139 | else
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140 | outside.add(n);
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141 | }
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142 |
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143 | if (outside.size() == 1 && inside.isEmpty()) {
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144 | center = outside.get(0).getEastNorth();
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145 | } else if (outside.size() == 1 && inside.size() == 1) {
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146 | center = outside.get(0).getEastNorth();
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147 | radius = center.distance(inside.get(0).getEastNorth());
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148 | } else if (inside.size() == 2 && outside.isEmpty()) {
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149 | // 2 nodes inside, define diameter
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150 | EastNorth en0 = inside.get(0).getEastNorth();
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151 | EastNorth en1 = inside.get(1).getEastNorth();
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152 | center = new EastNorth((en0.east() + en1.east()) / 2, (en0.north() + en1.north()) / 2);
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153 | radius = en0.distance(en1) / 2;
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154 | }
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155 |
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156 | fixNodes.addAll(inside);
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157 | fixNodes.addAll(collectNodesWithExternReferers(ways));
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158 | nodes = collectNodesAnticlockwise(ways);
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159 | if (nodes.size() < 4) {
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160 | new Notification(
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161 | tr("Not enough nodes in selected ways."))
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162 | .setIcon(JOptionPane.INFORMATION_MESSAGE)
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163 | .setDuration(Notification.TIME_SHORT)
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164 | .show();
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165 | return;
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166 | }
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167 | } else if (ways.isEmpty() && nodes.size() > 3) {
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168 | // Case 3
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169 | fixNodes.addAll(nodes);
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170 | // No need to reorder nodes since all are fix
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171 | } else {
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172 | // Invalid action
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173 | new Notification(
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174 | tr("Please select at least four nodes."))
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175 | .setIcon(JOptionPane.INFORMATION_MESSAGE)
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176 | .setDuration(Notification.TIME_SHORT)
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177 | .show();
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178 | return;
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179 | }
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180 |
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181 | if (center == null) {
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182 | // Compute the center of nodes
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183 | center = Geometry.getCenter(nodes);
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184 | if (center == null) {
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185 | new Notification(tr("Cannot determine center of selected nodes."))
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186 | .setIcon(JOptionPane.INFORMATION_MESSAGE)
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187 | .setDuration(Notification.TIME_SHORT)
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188 | .show();
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189 | return;
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190 | }
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191 | }
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192 |
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193 | // Now calculate the average distance to each node from the
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194 | // center. This method is ok as long as distances are short
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195 | // relative to the distance from the N or S poles.
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196 | if (radius == 0) {
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197 | for (Node n : nodes) {
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198 | radius += center.distance(n.getEastNorth());
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199 | }
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200 | radius = radius / nodes.size();
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201 | }
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202 |
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203 | if (!actionAllowed(nodes)) return;
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204 |
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205 | Collection<Command> cmds = new LinkedList<>();
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206 |
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207 | // Move each node to that distance from the center.
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208 | // Nodes that are not "fix" will be adjust making regular arcs.
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209 | int nodeCount = nodes.size();
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210 | // Search first fixed node
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211 | int startPosition;
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212 | for (startPosition = 0; startPosition < nodeCount; startPosition++) {
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213 | if (fixNodes.contains(nodes.get(startPosition % nodeCount)))
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214 | break;
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215 | }
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216 | int i = startPosition; // Start position for current arc
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217 | int j; // End position for current arc
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218 | while (i < startPosition + nodeCount) {
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219 | for (j = i + 1; j < startPosition + nodeCount; j++) {
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220 | if (fixNodes.contains(nodes.get(j % nodeCount)))
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221 | break;
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222 | }
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223 | Node first = nodes.get(i % nodeCount);
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224 | PolarCoor pcFirst = new PolarCoor(radius, PolarCoor.computeAngle(first.getEastNorth(), center), center);
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225 | cmds.add(createMoveCommand(first, pcFirst));
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226 | if (j > i + 1) {
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227 | double delta;
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228 | if (j == i + nodeCount) {
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229 | delta = 2 * Math.PI / nodeCount;
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230 | } else {
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231 | PolarCoor pcLast = new PolarCoor(nodes.get(j % nodeCount).getEastNorth(), center);
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232 | delta = pcLast.angle - pcFirst.angle;
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233 | if (delta < 0) // Assume each PolarCoor.angle is in range ]-pi; pi]
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234 | delta += 2*Math.PI;
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235 | delta /= j - i;
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236 | }
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237 | for (int k = i+1; k < j; k++) {
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238 | PolarCoor p = new PolarCoor(radius, pcFirst.angle + (k-i)*delta, center);
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239 | cmds.add(createMoveCommand(nodes.get(k % nodeCount), p));
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240 | }
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241 | }
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242 | i = j; // Update start point for next iteration
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243 | }
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244 |
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245 | UndoRedoHandler.getInstance().add(new SequenceCommand(tr("Align Nodes in Circle"), cmds));
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246 | }
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247 |
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248 | /**
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249 | * Collect all nodes with more than one referrer.
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250 | * @param ways Ways from witch nodes are selected
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251 | * @return List of nodes with more than one referrer
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252 | */
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253 | private static List<Node> collectNodesWithExternReferers(List<Way> ways) {
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254 | List<Node> withReferrers = new ArrayList<>();
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255 | for (Way w: ways) {
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256 | for (Node n: w.getNodes()) {
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257 | if (n.getReferrers().size() > 1) {
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258 | withReferrers.add(n);
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259 | }
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260 | }
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261 | }
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262 | return withReferrers;
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263 | }
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264 |
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265 | /**
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266 | * Assuming all ways can be joined into polygon, create an ordered list of node.
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267 | * @param ways List of ways to be joined
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268 | * @return Nodes anticlockwise ordered
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269 | */
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270 | private static List<Node> collectNodesAnticlockwise(List<Way> ways) {
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271 | List<Node> nodes = new ArrayList<>();
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272 | Node firstNode = ways.get(0).firstNode();
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273 | Node lastNode = null;
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274 | Way lastWay = null;
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275 | while (firstNode != lastNode) {
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276 | if (lastNode == null) lastNode = firstNode;
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277 | for (Way way: ways) {
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278 | if (way == lastWay) continue;
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279 | if (way.firstNode() == lastNode) {
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280 | List<Node> wayNodes = way.getNodes();
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281 | for (int i = 0; i < wayNodes.size() - 1; i++) {
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282 | nodes.add(wayNodes.get(i));
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283 | }
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284 | lastNode = way.lastNode();
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285 | lastWay = way;
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286 | break;
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287 | }
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288 | if (way.lastNode() == lastNode) {
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289 | List<Node> wayNodes = way.getNodes();
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290 | for (int i = wayNodes.size() - 1; i > 0; i--) {
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291 | nodes.add(wayNodes.get(i));
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292 | }
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293 | lastNode = way.firstNode();
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294 | lastWay = way;
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295 | break;
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296 | }
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297 | }
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298 | }
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299 | // Check if nodes are in anticlockwise order
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300 | int nc = nodes.size();
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301 | double area = 0;
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302 | for (int i = 0; i < nc; i++) {
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303 | EastNorth p1 = nodes.get(i).getEastNorth();
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304 | EastNorth p2 = nodes.get((i+1) % nc).getEastNorth();
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305 | area += p1.east()*p2.north() - p2.east()*p1.north();
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306 | }
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307 | if (area < 0)
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308 | Collections.reverse(nodes);
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309 | return nodes;
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310 | }
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311 |
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312 | /**
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313 | * Check if one or more nodes are outside of download area
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314 | * @param nodes Nodes to check
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315 | * @return true if action can be done
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316 | */
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317 | private static boolean actionAllowed(Collection<Node> nodes) {
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318 | boolean outside = false;
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319 | for (Node n: nodes) {
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320 | if (n.isOutsideDownloadArea()) {
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321 | outside = true;
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322 | break;
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323 | }
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324 | }
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325 | if (outside)
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326 | new Notification(
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327 | tr("One or more nodes involved in this action is outside of the downloaded area."))
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328 | .setIcon(JOptionPane.WARNING_MESSAGE)
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329 | .setDuration(Notification.TIME_SHORT)
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330 | .show();
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331 | return true;
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332 | }
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333 |
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334 | @Override
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335 | protected void updateEnabledState() {
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336 | DataSet ds = getLayerManager().getEditDataSet();
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337 | setEnabled(ds != null && !ds.selectionEmpty());
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338 | }
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339 |
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340 | @Override
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341 | protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
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342 | updateEnabledStateOnModifiableSelection(selection);
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343 | }
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344 |
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345 | /**
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346 | * Determines if ways can be joined into a polygon.
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347 | * @param ways The ways collection to check
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348 | * @return true if all ways can be joined into a polygon
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349 | */
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350 | private static boolean checkWaysArePolygon(Collection<Way> ways) {
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351 | // For each way, nodes strictly between first and last should't be reference by an other way
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352 | for (Way way: ways) {
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353 | for (Node node: way.getNodes()) {
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354 | if (way.isFirstLastNode(node)) continue;
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355 | for (Way wayOther: ways) {
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356 | if (way == wayOther) continue;
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357 | if (node.getReferrers().contains(wayOther)) return false;
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358 | }
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359 | }
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360 | }
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361 | // Test if ways can be joined
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362 | Way currentWay = null;
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363 | Node startNode = null, endNode = null;
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364 | int used = 0;
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365 | while (true) {
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366 | Way nextWay = null;
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367 | for (Way w: ways) {
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368 | if (w.isClosed()) return ways.size() == 1;
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369 | if (w == currentWay) continue;
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370 | if (currentWay == null) {
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371 | nextWay = w;
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372 | startNode = w.firstNode();
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373 | endNode = w.lastNode();
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374 | break;
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375 | }
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376 | if (w.firstNode() == endNode) {
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377 | nextWay = w;
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378 | endNode = w.lastNode();
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379 | break;
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380 | }
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381 | if (w.lastNode() == endNode) {
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382 | nextWay = w;
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383 | endNode = w.firstNode();
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384 | break;
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385 | }
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386 | }
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387 | if (nextWay == null) return false;
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388 | used += 1;
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389 | currentWay = nextWay;
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390 | if (endNode == startNode) return used == ways.size();
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391 | }
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392 | }
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393 | }
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