1 | // License: GPL. See LICENSE file for details.
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2 |
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3 | package org.openstreetmap.josm.gui;
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4 |
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5 | import java.awt.Point;
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6 | import java.util.ArrayList;
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7 | import java.util.Collection;
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8 | import java.util.Collections;
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9 | import java.util.HashSet;
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10 | import java.util.LinkedList;
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11 | import java.util.List;
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12 | import java.util.TreeMap;
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13 |
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14 | import javax.swing.JComponent;
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15 |
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16 | import org.openstreetmap.josm.Main;
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17 | import org.openstreetmap.josm.actions.HelpAction.Helpful;
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18 | import org.openstreetmap.josm.data.coor.EastNorth;
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19 | import org.openstreetmap.josm.data.coor.LatLon;
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20 | import org.openstreetmap.josm.data.osm.DataSet;
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21 | import org.openstreetmap.josm.data.osm.Node;
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22 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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23 | import org.openstreetmap.josm.data.osm.Way;
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24 | import org.openstreetmap.josm.data.osm.WaySegment;
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25 | import org.openstreetmap.josm.data.projection.Projection;
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26 |
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27 | /**
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28 | * An component that can be navigated by a mapmover. Used as map view and for the
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29 | * zoomer in the download dialog.
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30 | *
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31 | * @author imi
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32 | */
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33 | public class NavigatableComponent extends JComponent implements Helpful {
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34 |
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35 | public static final EastNorth world = Main.proj.latlon2eastNorth(new LatLon(Projection.MAX_LAT, Projection.MAX_LON));
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36 | public static final int snapDistance = sqr(Main.pref.getInteger("node.snap-distance", 10));
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37 |
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38 | private static int sqr(int a) { return a*a;}
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39 | /**
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40 | * The scale factor in x or y-units per pixel. This means, if scale = 10,
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41 | * every physical pixel on screen are 10 x or 10 y units in the
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42 | * northing/easting space of the projection.
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43 | */
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44 | protected double scale;
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45 | /**
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46 | * Center n/e coordinate of the desired screen center.
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47 | */
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48 | protected EastNorth center = new EastNorth(0, 0);
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49 |
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50 | public NavigatableComponent() {
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51 | setLayout(null);
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52 | }
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53 |
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54 | protected DataSet getData()
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55 | {
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56 | return Main.ds;
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57 | }
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58 |
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59 | /**
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60 | * Return the OSM-conform zoom factor (0 for whole world, 1 for half, 2 for quarter...)
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61 | */
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62 | public int zoom() {
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63 | double sizex = scale * getWidth();
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64 | double sizey = scale * getHeight();
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65 | for (int zoom = 0; zoom <= 32; zoom++, sizex *= 2, sizey *= 2)
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66 | if (sizex > world.east() || sizey > world.north())
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67 | return zoom;
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68 | return 32;
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69 | }
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70 |
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71 | /**
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72 | * Return a ID which is unique as long as viewport dimensions are the same
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73 | */
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74 | public Integer getViewID()
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75 | {
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76 | String x = center.east() + "_" + center.north() + "_" + scale + "_" +
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77 | getWidth() + "_" + getHeight();
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78 | java.util.zip.CRC32 id = new java.util.zip.CRC32();
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79 | id.update(x.getBytes());
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80 | return new Long(id.getValue()).intValue();
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81 | }
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82 |
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83 | /**
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84 | * Return the current scale value.
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85 | * @return The scale value currently used in display
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86 | */
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87 | public double getScale() {
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88 | return scale;
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89 | }
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90 |
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91 | /**
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92 | * @return Returns the center point. A copy is returned, so users cannot
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93 | * change the center by accessing the return value. Use zoomTo instead.
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94 | */
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95 | public EastNorth getCenter() {
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96 | return center;
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97 | }
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98 |
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99 | /**
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100 | * @param x X-Pixelposition to get coordinate from
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101 | * @param y Y-Pixelposition to get coordinate from
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102 | *
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103 | * @return Geographic coordinates from a specific pixel coordination
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104 | * on the screen.
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105 | */
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106 | public EastNorth getEastNorth(int x, int y) {
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107 | return new EastNorth(
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108 | center.east() + (x - getWidth()/2.0)*scale,
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109 | center.north() - (y - getHeight()/2.0)*scale);
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110 | }
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111 |
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112 | /**
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113 | * @param x X-Pixelposition to get coordinate from
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114 | * @param y Y-Pixelposition to get coordinate from
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115 | *
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116 | * @return Geographic unprojected coordinates from a specific pixel coordination
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117 | * on the screen.
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118 | */
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119 | public LatLon getLatLon(int x, int y) {
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120 |
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121 | return getProjection().eastNorth2latlon(getEastNorth(x, y));
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122 | }
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123 |
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124 | /**
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125 | * Return the point on the screen where this Coordinate would be.
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126 | * @param p The point, where this geopoint would be drawn.
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127 | * @return The point on screen where "point" would be drawn, relative
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128 | * to the own top/left.
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129 | */
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130 | public Point getPoint(EastNorth p) {
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131 | if(null == p)
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132 | return new Point();
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133 | double x = (p.east()-center.east())/scale + getWidth()/2;
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134 | double y = (center.north()-p.north())/scale + getHeight()/2;
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135 | return new Point((int)x,(int)y);
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136 | }
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137 |
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138 | /**
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139 | * Zoom to the given coordinate.
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140 | * @param newCenter The center x-value (easting) to zoom to.
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141 | * @param scale The scale to use.
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142 | */
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143 | public void zoomTo(EastNorth newCenter, double scale) {
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144 | center = newCenter;
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145 | getProjection().eastNorth2latlon(center);
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146 | this.scale = scale;
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147 | repaint();
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148 | }
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149 |
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150 | /**
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151 | * Return the nearest point to the screen point given.
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152 | * If a node within 10 pixel is found, the nearest node is returned.
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153 | */
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154 | public final Node getNearestNode(Point p) {
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155 | double minDistanceSq = Double.MAX_VALUE;
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156 | Node minPrimitive = null;
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157 | for (Node n : getData().nodes) {
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158 | if (n.deleted || n.incomplete)
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159 | continue;
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160 | Point sp = getPoint(n.eastNorth);
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161 | double dist = p.distanceSq(sp);
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162 | if (minDistanceSq > dist && dist < snapDistance) {
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163 | minDistanceSq = p.distanceSq(sp);
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164 | minPrimitive = n;
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165 | }
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166 | // prefer already selected node when multiple nodes on one point
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167 | else if(minDistanceSq == dist && n.selected && !minPrimitive.selected)
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168 | {
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169 | minPrimitive = n;
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170 | }
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171 | }
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172 | return minPrimitive;
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173 | }
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174 |
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175 | /**
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176 | * @return all way segments within 10px of p, sorted by their
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177 | * perpendicular distance.
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178 | *
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179 | * @param p the point for which to search the nearest segment.
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180 | */
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181 | public final List<WaySegment> getNearestWaySegments(Point p) {
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182 | TreeMap<Double, List<WaySegment>> nearest = new TreeMap<Double, List<WaySegment>>();
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183 | for (Way w : getData().ways) {
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184 | if (w.deleted || w.incomplete) continue;
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185 | Node lastN = null;
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186 | int i = -2;
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187 | for (Node n : w.nodes) {
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188 | i++;
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189 | if (n.deleted || n.incomplete) continue;
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190 | if (lastN == null) {
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191 | lastN = n;
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192 | continue;
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193 | }
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194 |
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195 | Point A = getPoint(lastN.eastNorth);
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196 | Point B = getPoint(n.eastNorth);
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197 | double c = A.distanceSq(B);
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198 | double a = p.distanceSq(B);
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199 | double b = p.distanceSq(A);
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200 | double perDist = a-(a-b+c)*(a-b+c)/4/c; // perpendicular distance squared
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201 | if (perDist < snapDistance && a < c+snapDistance && b < c+snapDistance) {
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202 | if(w.selected) // prefer selected ways a little bit
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203 | perDist -= 0.00001;
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204 | List<WaySegment> l;
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205 | if (nearest.containsKey(perDist)) {
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206 | l = nearest.get(perDist);
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207 | } else {
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208 | l = new LinkedList<WaySegment>();
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209 | nearest.put(perDist, l);
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210 | }
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211 | l.add(new WaySegment(w, i));
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212 | }
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213 |
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214 | lastN = n;
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215 | }
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216 | }
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217 | ArrayList<WaySegment> nearestList = new ArrayList<WaySegment>();
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218 | for (List<WaySegment> wss : nearest.values()) {
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219 | nearestList.addAll(wss);
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220 | }
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221 | return nearestList;
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222 | }
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223 |
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224 | /**
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225 | * @return the nearest way segment to the screen point given that is not
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226 | * in ignore.
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227 | *
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228 | * @param p the point for which to search the nearest segment.
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229 | * @param ignore a collection of segments which are not to be returned.
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230 | * May be null.
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231 | */
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232 | public final WaySegment getNearestWaySegment(Point p, Collection<WaySegment> ignore) {
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233 | List<WaySegment> nearest = getNearestWaySegments(p);
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234 | if (ignore != null) nearest.removeAll(ignore);
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235 | return nearest.isEmpty() ? null : nearest.get(0);
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236 | }
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237 |
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238 | /**
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239 | * @return the nearest way segment to the screen point given.
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240 | */
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241 | public final WaySegment getNearestWaySegment(Point p) {
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242 | return getNearestWaySegment(p, null);
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243 | }
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244 |
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245 | /**
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246 | * @return the nearest way to the screen point given.
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247 | */
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248 | public final Way getNearestWay(Point p) {
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249 | WaySegment nearestWaySeg = getNearestWaySegment(p);
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250 | return nearestWaySeg == null ? null : nearestWaySeg.way;
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251 | }
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252 |
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253 | /**
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254 | * Return the object, that is nearest to the given screen point.
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255 | *
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256 | * First, a node will be searched. If a node within 10 pixel is found, the
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257 | * nearest node is returned.
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258 | *
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259 | * If no node is found, search for near ways.
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260 | *
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261 | * If nothing is found, return <code>null</code>.
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262 | *
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263 | * @param p The point on screen.
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264 | * @return The primitive that is nearest to the point p.
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265 | */
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266 | public OsmPrimitive getNearest(Point p) {
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267 | OsmPrimitive osm = getNearestNode(p);
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268 | if (osm == null)
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269 | {
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270 | osm = getNearestWay(p);
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271 | }
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272 | return osm;
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273 | }
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274 |
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275 | /**
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276 | * Returns a singleton of the nearest object, or else an empty collection.
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277 | */
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278 | public Collection<OsmPrimitive> getNearestCollection(Point p) {
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279 | OsmPrimitive osm = getNearest(p);
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280 | if (osm == null)
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281 | return Collections.emptySet();
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282 | return Collections.singleton(osm);
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283 | }
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284 |
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285 | /**
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286 | * @return A list of all objects that are nearest to
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287 | * the mouse. Does a simple sequential scan on all the data.
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288 | *
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289 | * @return A collection of all items or <code>null</code>
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290 | * if no item under or near the point. The returned
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291 | * list is never empty.
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292 | */
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293 | public Collection<OsmPrimitive> getAllNearest(Point p) {
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294 | Collection<OsmPrimitive> nearest = new HashSet<OsmPrimitive>();
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295 | for (Way w : getData().ways) {
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296 | if (w.deleted || w.incomplete) continue;
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297 | Node lastN = null;
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298 | for (Node n : w.nodes) {
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299 | if (n.deleted || n.incomplete) continue;
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300 | if (lastN == null) {
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301 | lastN = n;
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302 | continue;
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303 | }
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304 | Point A = getPoint(lastN.eastNorth);
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305 | Point B = getPoint(n.eastNorth);
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306 | double c = A.distanceSq(B);
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307 | double a = p.distanceSq(B);
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308 | double b = p.distanceSq(A);
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309 | double perDist = a-(a-b+c)*(a-b+c)/4/c; // perpendicular distance squared
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310 | if (perDist < snapDistance && a < c+snapDistance && b < c+snapDistance) {
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311 | nearest.add(w);
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312 | break;
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313 | }
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314 | lastN = n;
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315 | }
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316 | }
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317 | for (Node n : getData().nodes) {
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318 | if (!n.deleted && !n.incomplete
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319 | && getPoint(n.eastNorth).distanceSq(p) < snapDistance) {
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320 | nearest.add(n);
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321 | }
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322 | }
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323 | return nearest.isEmpty() ? null : nearest;
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324 | }
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325 |
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326 | /**
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327 | * @return A list of all nodes that are nearest to
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328 | * the mouse. Does a simple sequential scan on all the data.
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329 | *
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330 | * @return A collection of all nodes or <code>null</code>
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331 | * if no node under or near the point. The returned
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332 | * list is never empty.
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333 | */
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334 | public Collection<Node> getNearestNodes(Point p) {
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335 | Collection<Node> nearest = new HashSet<Node>();
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336 | for (Node n : getData().nodes) {
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337 | if (!n.deleted && !n.incomplete
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338 | && getPoint(n.eastNorth).distanceSq(p) < snapDistance) {
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339 | nearest.add(n);
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340 | }
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341 | }
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342 | return nearest.isEmpty() ? null : nearest;
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343 | }
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344 |
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345 | /**
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346 | * @return the nearest nodes to the screen point given that is not
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347 | * in ignore.
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348 | *
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349 | * @param p the point for which to search the nearest segment.
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350 | * @param ignore a collection of nodes which are not to be returned.
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351 | * May be null.
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352 | */
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353 | public final Collection<Node> getNearestNodes(Point p, Collection<Node> ignore) {
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354 | Collection<Node> nearest = getNearestNodes(p);
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355 | if (nearest == null) return null;
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356 | if (ignore != null) nearest.removeAll(ignore);
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357 | return nearest.isEmpty() ? null : nearest;
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358 | }
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359 |
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360 | /**
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361 | * @return The projection to be used in calculating stuff.
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362 | */
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363 | protected Projection getProjection() {
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364 | return Main.proj;
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365 | }
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366 |
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367 | public String helpTopic() {
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368 | String n = getClass().getName();
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369 | return n.substring(n.lastIndexOf('.')+1);
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370 | }
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371 | }
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