1 | // License: GPL. Copyright 2007 by Immanuel Scholz and others
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2 | package org.openstreetmap.josm.gui;
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3 |
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4 | import java.awt.Point;
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5 | import java.util.Collection;
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6 | import java.util.HashSet;
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7 |
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8 | import javax.swing.JComponent;
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9 |
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10 | import org.openstreetmap.josm.Main;
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11 | import org.openstreetmap.josm.actions.HelpAction.Helpful;
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12 | import org.openstreetmap.josm.data.coor.EastNorth;
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13 | import org.openstreetmap.josm.data.coor.LatLon;
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14 | import org.openstreetmap.josm.data.osm.Node;
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15 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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16 | import org.openstreetmap.josm.data.osm.Segment;
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17 | import org.openstreetmap.josm.data.osm.Way;
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18 | import org.openstreetmap.josm.data.projection.Projection;
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19 |
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20 | /**
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21 | * An component that can be navigated by a mapmover. Used as map view and for the
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22 | * zoomer in the download dialog.
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23 | *
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24 | * @author imi
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25 | */
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26 | public class NavigatableComponent extends JComponent implements Helpful {
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27 |
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28 |
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29 | public static final EastNorth world = Main.proj.latlon2eastNorth(new LatLon(Projection.MAX_LAT, Projection.MAX_LON));
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30 |
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31 | /**
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32 | * The scale factor in x or y-units per pixel. This means, if scale = 10,
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33 | * every physical pixel on screen are 10 x or 10 y units in the
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34 | * northing/easting space of the projection.
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35 | */
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36 | protected double scale;
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37 | /**
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38 | * Center n/e coordinate of the desired screen center.
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39 | */
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40 | protected EastNorth center;
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41 |
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42 | public NavigatableComponent() {
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43 | setLayout(null);
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44 | }
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45 |
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46 | /**
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47 | * Return the OSM-conform zoom factor (0 for whole world, 1 for half, 2 for quarter...)
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48 | */
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49 | public int zoom() {
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50 | double sizex = scale * getWidth();
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51 | double sizey = scale * getHeight();
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52 | for (int zoom = 0; zoom <= 32; zoom++, sizex *= 2, sizey *= 2)
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53 | if (sizex > world.east() || sizey > world.north())
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54 | return zoom;
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55 | return 32;
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56 | }
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57 |
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58 | /**
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59 | * Return the current scale value.
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60 | * @return The scale value currently used in display
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61 | */
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62 | public double getScale() {
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63 | return scale;
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64 | }
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65 |
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66 | /**
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67 | * @return Returns the center point. A copy is returned, so users cannot
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68 | * change the center by accessing the return value. Use zoomTo instead.
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69 | */
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70 | public EastNorth getCenter() {
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71 | return center;
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72 | }
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73 |
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74 | /**
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75 | * @param x X-Pixelposition to get coordinate from
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76 | * @param y Y-Pixelposition to get coordinate from
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77 | *
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78 | * @return Geographic coordinates from a specific pixel coordination
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79 | * on the screen.
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80 | */
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81 | public EastNorth getEastNorth(int x, int y) {
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82 | return new EastNorth(
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83 | center.east() + (x - getWidth()/2.0)*scale,
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84 | center.north() - (y - getHeight()/2.0)*scale);
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85 | }
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86 |
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87 | /**
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88 | * @param x X-Pixelposition to get coordinate from
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89 | * @param y Y-Pixelposition to get coordinate from
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90 | *
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91 | * @return Geographic unprojected coordinates from a specific pixel coordination
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92 | * on the screen.
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93 | */
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94 | public LatLon getLatLon(int x, int y) {
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95 | EastNorth eastNorth = new EastNorth(
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96 | center.east() + (x - getWidth()/2.0)*scale,
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97 | center.north() - (y - getHeight()/2.0)*scale);
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98 | return getProjection().eastNorth2latlon(eastNorth);
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99 | }
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100 |
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101 | /**
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102 | * Return the point on the screen where this Coordinate would be.
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103 | * @param point The point, where this geopoint would be drawn.
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104 | * @return The point on screen where "point" would be drawn, relative
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105 | * to the own top/left.
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106 | */
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107 | public Point getPoint(EastNorth p) {
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108 | double x = (p.east()-center.east())/scale + getWidth()/2;
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109 | double y = (center.north()-p.north())/scale + getHeight()/2;
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110 | return new Point((int)x,(int)y);
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111 | }
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112 |
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113 | /**
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114 | * Zoom to the given coordinate.
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115 | * @param centerX The center x-value (easting) to zoom to.
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116 | * @param centerY The center y-value (northing) to zoom to.
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117 | * @param scale The scale to use.
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118 | */
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119 | public void zoomTo(EastNorth newCenter, double scale) {
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120 | center = newCenter;
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121 | getProjection().eastNorth2latlon(center);
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122 | this.scale = scale;
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123 | repaint();
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124 | }
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125 |
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126 | /**
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127 | * Return the nearest point to the screen point given.
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128 | * If a node within 10 pixel is found, the nearest node is returned.
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129 | */
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130 | public final Node getNearestNode(Point p) {
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131 | double minDistanceSq = Double.MAX_VALUE;
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132 | Node minPrimitive = null;
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133 | for (Node n : Main.ds.nodes) {
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134 | if (n.deleted)
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135 | continue;
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136 | Point sp = getPoint(n.eastNorth);
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137 | double dist = p.distanceSq(sp);
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138 | if (minDistanceSq > dist && dist < 100) {
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139 | minDistanceSq = p.distanceSq(sp);
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140 | minPrimitive = n;
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141 | }
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142 | }
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143 | return minPrimitive;
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144 | }
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145 |
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146 | /**
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147 | * @return the nearest way to the screen point given.
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148 | */
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149 | public final Way getNearestWay(Point p) {
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150 | Way minPrimitive = null;
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151 | double minDistanceSq = Double.MAX_VALUE;
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152 | for (Way w : Main.ds.ways) {
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153 | if (w.deleted)
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154 | continue;
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155 | for (Segment ls : w.segments) {
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156 | if (ls.deleted || ls.incomplete)
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157 | continue;
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158 | Point A = getPoint(ls.from.eastNorth);
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159 | Point B = getPoint(ls.to.eastNorth);
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160 | double c = A.distanceSq(B);
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161 | double a = p.distanceSq(B);
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162 | double b = p.distanceSq(A);
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163 | double perDist = a-(a-b+c)*(a-b+c)/4/c; // perpendicular distance squared
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164 | if (perDist < 100 && minDistanceSq > perDist && a < c+100 && b < c+100) {
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165 | minDistanceSq = perDist;
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166 | minPrimitive = w;
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167 | }
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168 | }
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169 | }
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170 | return minPrimitive;
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171 | }
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172 |
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173 | /**
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174 | * @return the nearest segment to the screen point given.
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175 | */
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176 | public final Segment getNearestSegment(Point p) {
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177 | Segment minPrimitive = null;
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178 | double minDistanceSq = Double.MAX_VALUE;
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179 | // segments
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180 | for (Segment ls : Main.ds.segments) {
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181 | if (ls.deleted || ls.incomplete)
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182 | continue;
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183 | Point A = getPoint(ls.from.eastNorth);
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184 | Point B = getPoint(ls.to.eastNorth);
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185 | double c = A.distanceSq(B);
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186 | double a = p.distanceSq(B);
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187 | double b = p.distanceSq(A);
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188 | double perDist = a-(a-b+c)*(a-b+c)/4/c; // perpendicular distance squared
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189 | if (perDist < 100 && minDistanceSq > perDist && a < c+100 && b < c+100) {
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190 | minDistanceSq = perDist;
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191 | minPrimitive = ls;
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192 | }
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193 | }
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194 | return minPrimitive;
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195 | }
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196 |
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197 | /**
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198 | * Return the object, that is nearest to the given screen point.
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199 | *
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200 | * First, a node will be searched. If a node within 10 pixel is found, the
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201 | * nearest node is returned.
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202 | *
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203 | * If no node is found, search for pending segments.
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204 | *
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205 | * If no such segment is found, and a non-pending segment is
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206 | * within 10 pixel to p, this segment is returned, except when
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207 | * <code>wholeWay</code> is <code>true</code>, in which case the
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208 | * corresponding Way is returned.
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209 | *
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210 | * If no segment is found and the point is within an area, return that
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211 | * area.
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212 | *
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213 | * If no area is found, return <code>null</code>.
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214 | *
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215 | * @param p The point on screen.
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216 | * @param segmentInsteadWay Whether the segment (true) or only the whole
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217 | * way should be returned.
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218 | * @return The primitive, that is nearest to the point p.
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219 | */
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220 | public OsmPrimitive getNearest(Point p, boolean segmentInsteadWay) {
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221 | OsmPrimitive osm = getNearestNode(p);
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222 | if (osm == null && !segmentInsteadWay)
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223 | osm = getNearestWay(p);
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224 | if (osm == null)
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225 | osm = getNearestSegment(p);
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226 | return osm;
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227 | }
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228 |
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229 | /**
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230 | * @return A list of all objects that are nearest to
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231 | * the mouse. To do this, first the nearest object is
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232 | * determined.
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233 | *
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234 | * If its a node, return all segments and
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235 | * streets the node is part of, as well as all nodes
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236 | * (with their segments and ways) with the same
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237 | * location.
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238 | *
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239 | * If its a segment, return all ways this segment
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240 | * belongs to as well as all segments that are between
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241 | * the same nodes (in both direction) with all their ways.
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242 | *
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243 | * @return A collection of all items or <code>null</code>
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244 | * if no item under or near the point. The returned
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245 | * list is never empty.
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246 | */
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247 | public Collection<OsmPrimitive> getAllNearest(Point p) {
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248 | OsmPrimitive osm = getNearest(p, true);
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249 | if (osm == null)
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250 | return null;
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251 | Collection<OsmPrimitive> c = new HashSet<OsmPrimitive>();
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252 | c.add(osm);
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253 | if (osm instanceof Node) {
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254 | Node node = (Node)osm;
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255 | for (Node n : Main.ds.nodes)
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256 | if (!n.deleted && n.coor.equals(node.coor))
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257 | c.add(n);
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258 | for (Segment ls : Main.ds.segments)
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259 | // segments never match nodes, so they are skipped by contains
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260 | if (!ls.deleted && !ls.incomplete && (c.contains(ls.from) || c.contains(ls.to)))
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261 | c.add(ls);
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262 | }
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263 | if (osm instanceof Segment) {
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264 | Segment line = (Segment)osm;
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265 | for (Segment ls : Main.ds.segments)
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266 | if (!ls.deleted && ls.equalPlace(line))
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267 | c.add(ls);
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268 | }
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269 | if (osm instanceof Node || osm instanceof Segment) {
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270 | for (Way w : Main.ds.ways) {
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271 | if (w.deleted)
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272 | continue;
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273 | for (Segment ls : w.segments) {
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274 | if (!ls.deleted && !ls.incomplete && c.contains(ls)) {
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275 | c.add(w);
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276 | break;
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277 | }
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278 | }
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279 | }
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280 | }
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281 | return c;
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282 | }
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283 |
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284 | /**
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285 | * @return The projection to be used in calculating stuff.
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286 | */
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287 | protected Projection getProjection() {
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288 | return Main.proj;
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289 | }
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290 |
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291 | public String helpTopic() {
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292 | String n = getClass().getName();
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293 | return n.substring(n.lastIndexOf('.')+1);
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294 | }
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295 | }
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