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 |
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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.LinkedList;
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12 | import java.util.List;
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13 |
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14 | import javax.swing.JOptionPane;
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15 |
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16 | import org.openstreetmap.josm.Main;
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17 | import org.openstreetmap.josm.command.AddCommand;
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18 | import org.openstreetmap.josm.command.ChangeCommand;
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19 | import org.openstreetmap.josm.command.Command;
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20 | import org.openstreetmap.josm.command.DeleteCommand;
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21 | import org.openstreetmap.josm.command.SequenceCommand;
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22 | import org.openstreetmap.josm.data.coor.EastNorth;
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23 | import org.openstreetmap.josm.data.osm.Node;
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24 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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25 | import org.openstreetmap.josm.data.osm.Way;
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26 | import org.openstreetmap.josm.tools.Shortcut;
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27 |
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28 | /**
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29 | * - 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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30 | * - Create a new circle from three selected nodes--or a way with 3 nodes.
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31 | * - Useful for roundabouts
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32 | *
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33 | * Note: If a way is selected, it is changed. If nodes are selected a new way is created.
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34 | * 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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35 | *
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36 | * BTW: Someone might want to implement projection corrections for this...
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37 | *
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38 | * @author Henry Loenwind, based on much copy&Paste from other Actions.
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39 | * @author Sebastian Masch
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40 | */
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41 | public final class CreateCircleAction extends JosmAction {
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42 |
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43 | public CreateCircleAction() {
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44 | super(tr("Create Circle"), "createcircle", tr("Create a circle from three selected nodes."),
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45 | Shortcut.registerShortcut("tools:createcircle", tr("Tool: {0}", tr("Create Circle")),
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46 | KeyEvent.VK_O, Shortcut.SHIFT), true);
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47 | putValue("help", ht("/Action/CreateCircle"));
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48 | }
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49 |
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50 | private double calcang(double xc, double yc, double x, double y) {
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51 | // calculate the angle from xc|yc to x|y
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52 | if (xc == x && yc == y)
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53 | return 0; // actually invalid, but we won't have this case in this context
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54 | double yd = Math.abs(y - yc);
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55 | if (yd == 0 && xc < x)
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56 | return 0;
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57 | if (yd == 0 && xc > x)
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58 | return Math.PI;
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59 | double xd = Math.abs(x - xc);
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60 | double a = Math.atan2(xd, yd);
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61 | if (y > yc) {
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62 | a = Math.PI - a;
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63 | }
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64 | if (x < xc) {
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65 | a = -a;
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66 | }
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67 | a = 1.5*Math.PI + a;
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68 | if (a < 0) {
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69 | a += 2*Math.PI;
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70 | }
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71 | if (a >= 2*Math.PI) {
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72 | a -= 2*Math.PI;
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73 | }
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74 | return a;
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75 | }
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76 |
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77 | public void actionPerformed(ActionEvent e) {
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78 | if (!isEnabled())
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79 | return;
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80 |
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81 | int numberOfNodesInCircle = Main.pref.getInteger("createcircle.nodecount", 8);
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82 | if (numberOfNodesInCircle < 1) {
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83 | numberOfNodesInCircle = 1;
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84 | } else if (numberOfNodesInCircle > 100) {
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85 | numberOfNodesInCircle = 100;
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86 | }
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87 |
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88 | Collection<OsmPrimitive> sel = getCurrentDataSet().getSelected();
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89 | List<Node> nodes = new LinkedList<Node>();
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90 | Way existingWay = null;
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91 |
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92 | for (OsmPrimitive osm : sel)
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93 | if (osm instanceof Node) {
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94 | nodes.add((Node)osm);
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95 | }
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96 |
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97 | // special case if no single nodes are selected and exactly one way is:
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98 | // then use the way's nodes
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99 | if ((nodes.size() == 0) && (sel.size() == 1)) {
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100 | for (OsmPrimitive osm : sel)
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101 | if (osm instanceof Way) {
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102 | existingWay = ((Way)osm);
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103 | for (Node n : ((Way)osm).getNodes())
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104 | {
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105 | if(!nodes.contains(n)) {
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106 | nodes.add(n);
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107 | }
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108 | }
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109 | }
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110 | }
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111 |
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112 | // now we can start doing things to OSM data
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113 | Collection<Command> cmds = new LinkedList<Command>();
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114 |
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115 | if (nodes.size() == 2) {
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116 | // diameter: two single nodes needed or a way with two nodes
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117 |
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118 | Node n1 = nodes.get(0);
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119 | double x1 = n1.getEastNorth().east();
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120 | double y1 = n1.getEastNorth().north();
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121 | Node n2 = nodes.get(1);
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122 | double x2 = n2.getEastNorth().east();
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123 | double y2 = n2.getEastNorth().north();
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124 |
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125 | // calculate the center (xc/yc)
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126 | double xc = 0.5 * (x1 + x2);
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127 | double yc = 0.5 * (y1 + y2);
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128 |
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129 | // calculate the radius (r)
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130 | double r = Math.sqrt(Math.pow(xc-x1,2) + Math.pow(yc-y1,2));
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131 |
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132 | // find where to put the existing nodes
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133 | double a1 = calcang(xc, yc, x1, y1);
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134 | double a2 = calcang(xc, yc, x2, y2);
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135 | if (a1 < a2) { double at = a1; Node nt = n1; a1 = a2; n1 = n2; a2 = at; n2 = nt; }
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136 |
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137 | // build a way for the circle
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138 | List<Node> wayToAdd = new ArrayList<Node>();
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139 |
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140 | for (int i = 1; i <= numberOfNodesInCircle; i++) {
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141 | double a = a2 + 2*Math.PI*(1.0 - i/(double)numberOfNodesInCircle); // "1-" to get it clock-wise
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142 |
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143 | // insert existing nodes if they fit before this new node (999 means "already added this node")
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144 | if ((a1 < 999) && (a1 > a - 1E-9) && (a1 < a + 1E-9)) {
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145 | wayToAdd.add(n1);
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146 | a1 = 999;
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147 | }
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148 | else if ((a2 < 999) && (a2 > a - 1E-9) && (a2 < a + 1E-9)) {
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149 | wayToAdd.add(n2);
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150 | a2 = 999;
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151 | }
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152 | else {
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153 | // get the position of the new node and insert it
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154 | double x = xc + r*Math.cos(a);
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155 | double y = yc + r*Math.sin(a);
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156 | Node n = new Node(Main.getProjection().eastNorth2latlon(new EastNorth(x,y)));
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157 | wayToAdd.add(n);
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158 | cmds.add(new AddCommand(n));
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159 | }
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160 | }
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161 | wayToAdd.add(wayToAdd.get(0)); // close the circle
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162 | if (existingWay == null) {
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163 | Way newWay = new Way();
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164 | newWay.setNodes(wayToAdd);
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165 | cmds.add(new AddCommand(newWay));
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166 | } else {
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167 | Way newWay = new Way(existingWay);
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168 | newWay.setNodes(wayToAdd);
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169 | cmds.add(new ChangeCommand(existingWay, newWay));
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170 | }
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171 |
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172 | // the first node may be unused/abandoned if createcircle.nodecount is odd
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173 | if (a1 < 999) {
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174 | // if it is, delete it
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175 | List<OsmPrimitive> parents = n1.getReferrers();
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176 | if (parents.isEmpty() || ((parents.size() == 1) && (parents.contains(existingWay)))) {
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177 | cmds.add(new DeleteCommand(n1));
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178 | }
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179 |
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180 | // or insert it
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181 | // wayToAdd.nodes.add((numberOfNodesInCircle - 1) / 2, n1);
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182 | }
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183 |
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184 | } else if (nodes.size() == 3) {
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185 | // triangle: three single nodes needed or a way with three nodes
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186 |
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187 | // let's get some shorter names
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188 | Node n1 = nodes.get(0);
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189 | double x1 = n1.getEastNorth().east();
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190 | double y1 = n1.getEastNorth().north();
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191 | Node n2 = nodes.get(1);
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192 | double x2 = n2.getEastNorth().east();
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193 | double y2 = n2.getEastNorth().north();
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194 | Node n3 = nodes.get(2);
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195 | double x3 = n3.getEastNorth().east();
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196 | double y3 = n3.getEastNorth().north();
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197 |
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198 | // calculate the center (xc/yc)
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199 | double s = 0.5*((x2 - x3)*(x1 - x3) - (y2 - y3)*(y3 - y1));
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200 | double sUnder = (x1 - x2)*(y3 - y1) - (y2 - y1)*(x1 - x3);
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201 |
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202 | if (sUnder == 0) {
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203 | JOptionPane.showMessageDialog(
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204 | Main.parent,
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205 | tr("Those nodes are not in a circle. Aborting."),
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206 | tr("Warning"),
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207 | JOptionPane.WARNING_MESSAGE
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208 | );
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209 | return;
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210 | }
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211 |
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212 | s /= sUnder;
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213 |
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214 | double xc = 0.5*(x1 + x2) + s*(y2 - y1);
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215 | double yc = 0.5*(y1 + y2) + s*(x1 - x2);
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216 |
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217 | // calculate the radius (r)
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218 | double r = Math.sqrt(Math.pow(xc-x1,2) + Math.pow(yc-y1,2));
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219 |
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220 | // find where to put the existing nodes
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221 | double a1 = calcang(xc, yc, x1, y1);
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222 | double a2 = calcang(xc, yc, x2, y2);
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223 | double a3 = calcang(xc, yc, x3, y3);
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224 | if (a1 < a2) { double at = a1; Node nt = n1; a1 = a2; n1 = n2; a2 = at; n2 = nt; }
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225 | if (a2 < a3) { double at = a2; Node nt = n2; a2 = a3; n2 = n3; a3 = at; n3 = nt; }
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226 | if (a1 < a2) { double at = a1; Node nt = n1; a1 = a2; n1 = n2; a2 = at; n2 = nt; }
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227 |
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228 | // build a way for the circle
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229 | List<Node> wayToAdd = new ArrayList<Node>();
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230 | for (int i = 1; i <= numberOfNodesInCircle; i++) {
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231 | double a = 2*Math.PI*(1.0 - i/(double)numberOfNodesInCircle); // "1-" to get it clock-wise
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232 | // insert existing nodes if they fit before this new node (999 means "already added this node")
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233 | if (a1 < 999 && a1 > a) {
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234 | wayToAdd.add(n1);
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235 | a1 = 999;
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236 | }
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237 | if (a2 < 999 && a2 > a) {
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238 | wayToAdd.add(n2);
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239 | a2 = 999;
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240 | }
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241 | if (a3 < 999 && a3 > a) {
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242 | wayToAdd.add(n3);
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243 | a3 = 999;
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244 | }
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245 | // get the position of the new node and insert it
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246 | double x = xc + r*Math.cos(a);
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247 | double y = yc + r*Math.sin(a);
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248 | Node n = new Node(Main.getProjection().eastNorth2latlon(new EastNorth(x,y)));
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249 | wayToAdd.add(n);
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250 | cmds.add(new AddCommand(n));
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251 | }
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252 | wayToAdd.add(wayToAdd.get(0)); // close the circle
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253 | if (existingWay == null) {
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254 | Way newWay = new Way();
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255 | newWay.setNodes(wayToAdd);
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256 | cmds.add(new AddCommand(newWay));
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257 | } else {
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258 | Way newWay = new Way(existingWay);
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259 | newWay.setNodes(wayToAdd);
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260 | cmds.add(new ChangeCommand(existingWay, newWay));
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261 | }
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262 |
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263 | } else {
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264 | JOptionPane.showMessageDialog(
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265 | Main.parent,
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266 | tr("Please select exactly two or three nodes or one way with exactly two or three nodes."),
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267 | tr("Information"),
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268 | JOptionPane.INFORMATION_MESSAGE
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269 | );
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270 | return;
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271 | }
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272 |
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273 | Main.main.undoRedo.add(new SequenceCommand(tr("Create Circle"), cmds));
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274 | Main.map.repaint();
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275 | }
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276 |
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277 | @Override
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278 | protected void updateEnabledState() {
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279 | if (getCurrentDataSet() == null) {
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280 | setEnabled(false);
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281 | } else {
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282 | updateEnabledState(getCurrentDataSet().getSelected());
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283 | }
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284 | }
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285 |
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286 | @Override
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287 | protected void updateEnabledState(Collection<? extends OsmPrimitive> selection) {
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288 | setEnabled(selection != null && !selection.isEmpty());
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289 | }
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290 | }
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