1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
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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 | import static org.openstreetmap.josm.tools.I18n.trn;
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7 |
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8 | import java.awt.event.ActionEvent;
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9 | import java.awt.event.KeyEvent;
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10 | import java.util.ArrayList;
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11 | import java.util.Collection;
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12 | import java.util.Collections;
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13 | import java.util.HashSet;
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14 | import java.util.LinkedList;
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15 | import java.util.List;
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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.Main;
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20 | import org.openstreetmap.josm.command.ChangeCommand;
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21 | import org.openstreetmap.josm.command.Command;
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22 | import org.openstreetmap.josm.command.DeleteCommand;
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23 | import org.openstreetmap.josm.command.SequenceCommand;
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24 | import org.openstreetmap.josm.data.osm.DataSet;
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25 | import org.openstreetmap.josm.data.osm.Node;
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26 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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27 | import org.openstreetmap.josm.data.osm.Way;
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28 | import org.openstreetmap.josm.gui.HelpAwareOptionPane;
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29 | import org.openstreetmap.josm.gui.HelpAwareOptionPane.ButtonSpec;
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30 | import org.openstreetmap.josm.gui.help.HelpUtil;
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31 | import org.openstreetmap.josm.tools.ImageProvider;
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32 | import org.openstreetmap.josm.tools.Shortcut;
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33 |
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34 | public class SimplifyWayAction extends JosmAction {
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35 | public SimplifyWayAction() {
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36 | super(tr("Simplify Way"), "simplify", tr("Delete unnecessary nodes from a way."), Shortcut.registerShortcut("tools:simplify", tr("Tool: {0}", tr("Simplify Way")),
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37 | KeyEvent.VK_Y, Shortcut.SHIFT), true);
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38 | putValue("help", ht("/Action/SimplifyWay"));
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39 | }
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40 |
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41 | protected boolean confirmWayWithNodesOutsideBoundingBox(List<? extends OsmPrimitive> primitives) {
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42 | System.out.println(primitives);
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43 | return DeleteCommand.checkAndConfirmOutlyingDelete(Main.map.mapView.getEditLayer(), primitives, null);
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44 | }
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45 |
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46 | protected void alertSelectAtLeastOneWay() {
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47 | HelpAwareOptionPane.showOptionDialog(
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48 | Main.parent,
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49 | tr("Please select at least one way to simplify."),
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50 | tr("Warning"),
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51 | JOptionPane.WARNING_MESSAGE,
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52 | HelpUtil.ht("/Action/SimplifyWay#SelectAWayToSimplify")
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53 | );
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54 | }
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55 |
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56 | protected boolean confirmSimplifyManyWays(int numWays) {
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57 | ButtonSpec[] options = new ButtonSpec[] {
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58 | new ButtonSpec(
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59 | tr("Yes"),
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60 | ImageProvider.get("ok"),
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61 | tr("Simplify all selected ways"),
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62 | null
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63 | ),
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64 | new ButtonSpec(
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65 | tr("Cancel"),
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66 | ImageProvider.get("cancel"),
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67 | tr("Cancel operation"),
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68 | null
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69 | )
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70 | };
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71 | int ret = HelpAwareOptionPane.showOptionDialog(
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72 | Main.parent,
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73 | tr(
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74 | "The selection contains {0} ways. Are you sure you want to simplify them all?",
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75 | numWays
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76 | ),
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77 | tr("Simplify ways?"),
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78 | JOptionPane.WARNING_MESSAGE,
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79 | null, // no special icon
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80 | options,
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81 | options[0],
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82 | HelpUtil.ht("/Action/SimplifyWay#ConfirmSimplifyAll")
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83 | );
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84 | return ret == 0;
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85 | }
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86 |
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87 | public void actionPerformed(ActionEvent e) {
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88 | DataSet ds = getCurrentDataSet();
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89 | ds.beginUpdate();
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90 | try
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91 | {
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92 | List<Way> ways = OsmPrimitive.getFilteredList(ds.getSelected(), Way.class);
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93 | if (ways.isEmpty()) {
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94 | alertSelectAtLeastOneWay();
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95 | return;
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96 | } else if (!confirmWayWithNodesOutsideBoundingBox(ways))
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97 | return;
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98 | else if (ways.size() > 10) {
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99 | if (!confirmSimplifyManyWays(ways.size()))
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100 | return;
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101 | }
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102 |
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103 | Collection<Command> allCommands = new LinkedList<Command>();
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104 | for (Way way: ways) {
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105 | SequenceCommand simplifyCommand = simplifyWay(way, ds);
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106 | if (simplifyCommand == null) {
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107 | continue;
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108 | }
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109 | allCommands.add(simplifyCommand);
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110 | }
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111 | if (allCommands.isEmpty()) return;
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112 | SequenceCommand rootCommand = new SequenceCommand(
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113 | trn("Simplify {0} way", "Simplify {0} ways", allCommands.size(), allCommands.size()),
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114 | allCommands
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115 | );
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116 | Main.main.undoRedo.add(rootCommand);
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117 | } finally {
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118 | ds.endUpdate();
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119 | }
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120 | Main.map.repaint();
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121 | }
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122 |
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123 | /**
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124 | * Replies true if <code>node</code> is a required node which can't be removed
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125 | * in order to simplify the way.
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126 | *
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127 | * @param way the way to be simplified
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128 | * @param node the node to check
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129 | * @return true if <code>node</code> is a required node which can't be removed
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130 | * in order to simplify the way.
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131 | */
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132 | protected boolean isRequiredNode(Way way, Node node) {
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133 | boolean isRequired = Collections.frequency(way.getNodes(), node) > 1;
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134 | if (! isRequired) {
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135 | List<OsmPrimitive> parents = new LinkedList<OsmPrimitive>();
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136 | parents.addAll(node.getReferrers());
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137 | parents.remove(way);
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138 | isRequired = !parents.isEmpty();
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139 | }
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140 | if (!isRequired) {
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141 | isRequired = node.isTagged();
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142 | }
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143 | return isRequired;
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144 | }
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145 |
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146 | /**
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147 | * Simplifies a way
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148 | *
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149 | * @param w the way to simplify
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150 | */
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151 | public SequenceCommand simplifyWay(Way w, DataSet ds) {
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152 | double threshold = Main.pref.getDouble("simplify-way.max-error", 3.0);
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153 | int lower = 0;
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154 | int i = 0;
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155 | List<Node> newNodes = new ArrayList<Node>(w.getNodesCount());
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156 | while(i < w.getNodesCount()){
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157 | if (isRequiredNode(w,w.getNode(i))) {
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158 | // copy a required node to the list of new nodes. Simplify not
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159 | // possible
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160 | newNodes.add(w.getNode(i));
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161 | i++;
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162 | lower++;
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163 | continue;
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164 | }
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165 | i++;
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166 | // find the longest sequence of not required nodes ...
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167 | while(i<w.getNodesCount() && !isRequiredNode(w,w.getNode(i))) {
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168 | i++;
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169 | }
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170 | // ... and simplify them
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171 | buildSimplifiedNodeList(w.getNodes(), lower, Math.min(w.getNodesCount()-1, i), threshold,newNodes);
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172 | lower=i;
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173 | i++;
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174 | }
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175 |
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176 | HashSet<Node> delNodes = new HashSet<Node>();
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177 | delNodes.addAll(w.getNodes());
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178 | delNodes.removeAll(newNodes);
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179 |
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180 | if (delNodes.isEmpty()) return null;
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181 |
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182 | Collection<Command> cmds = new LinkedList<Command>();
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183 | Way newWay = new Way(w);
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184 | newWay.setNodes(newNodes);
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185 | cmds.add(new ChangeCommand(w, newWay));
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186 | cmds.add(new DeleteCommand(delNodes));
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187 | ds.clearSelection(delNodes);
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188 | return new SequenceCommand(trn("Simplify Way (remove {0} node)", "Simplify Way (remove {0} nodes)", delNodes.size(), delNodes.size()), cmds);
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189 | }
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190 |
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191 | /**
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192 | * Builds the simplified list of nodes for a way segment given by a lower index <code>from</code>
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193 | * and an upper index <code>to</code>
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194 | *
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195 | * @param wnew the way to simplify
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196 | * @param from the lower index
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197 | * @param to the upper index
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198 | * @param threshold
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199 | */
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200 | protected void buildSimplifiedNodeList(List<Node> wnew, int from, int to, double threshold, List<Node> simplifiedNodes) {
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201 |
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202 | Node fromN = wnew.get(from);
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203 | Node toN = wnew.get(to);
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204 |
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205 | // Get max xte
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206 | int imax = -1;
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207 | double xtemax = 0;
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208 | for (int i = from + 1; i < to; i++) {
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209 | Node n = wnew.get(i);
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210 | double xte = Math.abs(EARTH_RAD
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211 | * xtd(fromN.getCoor().lat() * Math.PI / 180, fromN.getCoor().lon() * Math.PI / 180, toN.getCoor().lat() * Math.PI
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212 | / 180, toN.getCoor().lon() * Math.PI / 180, n.getCoor().lat() * Math.PI / 180, n.getCoor().lon() * Math.PI
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213 | / 180));
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214 | if (xte > xtemax) {
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215 | xtemax = xte;
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216 | imax = i;
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217 | }
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218 | }
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219 |
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220 | if (imax != -1 && xtemax >= threshold) {
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221 | // Segment cannot be simplified - try shorter segments
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222 | buildSimplifiedNodeList(wnew, from, imax,threshold,simplifiedNodes);
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223 | //simplifiedNodes.add(wnew.get(imax));
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224 | buildSimplifiedNodeList(wnew, imax, to, threshold,simplifiedNodes);
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225 | } else {
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226 | // Simplify segment
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227 | if (simplifiedNodes.isEmpty() || simplifiedNodes.get(simplifiedNodes.size()-1) != fromN) {
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228 | simplifiedNodes.add(fromN);
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229 | }
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230 | if (fromN != toN) {
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231 | simplifiedNodes.add(toN);
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232 | }
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233 | }
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234 | }
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235 |
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236 | public static final double EARTH_RAD = 6378137.0;
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237 |
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238 | /* From Aviaton Formulary v1.3
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239 | * http://williams.best.vwh.net/avform.htm
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240 | */
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241 | public static double dist(double lat1, double lon1, double lat2, double lon2) {
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242 | return 2 * Math.asin(Math.sqrt(Math.pow(Math.sin((lat1 - lat2) / 2), 2) + Math.cos(lat1) * Math.cos(lat2)
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243 | * Math.pow(Math.sin((lon1 - lon2) / 2), 2)));
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244 | }
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245 |
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246 | public static double course(double lat1, double lon1, double lat2, double lon2) {
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247 | return Math.atan2(Math.sin(lon1 - lon2) * Math.cos(lat2), Math.cos(lat1) * Math.sin(lat2) - Math.sin(lat1)
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248 | * Math.cos(lat2) * Math.cos(lon1 - lon2))
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249 | % (2 * Math.PI);
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250 | }
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251 |
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252 | public static double xtd(double lat1, double lon1, double lat2, double lon2, double lat3, double lon3) {
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253 | double dist_AD = dist(lat1, lon1, lat3, lon3);
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254 | double crs_AD = course(lat1, lon1, lat3, lon3);
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255 | double crs_AB = course(lat1, lon1, lat2, lon2);
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256 | return Math.asin(Math.sin(dist_AD) * Math.sin(crs_AD - crs_AB));
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257 | }
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258 |
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259 | @Override
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260 | protected void updateEnabledState() {
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261 | if (getCurrentDataSet() == null) {
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262 | setEnabled(false);
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263 | } else {
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264 | updateEnabledState(getCurrentDataSet().getSelected());
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265 | }
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266 | }
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267 |
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268 | @Override
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269 | protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
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270 | setEnabled(selection != null && !selection.isEmpty());
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271 | }
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272 | }
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