1 | // License: GPL. For details, see LICENSE file.
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2 | package org.openstreetmap.josm.data.osm.visitor;
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3 |
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4 | import java.util.Collection;
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5 |
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6 | import org.openstreetmap.josm.Main;
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7 | import org.openstreetmap.josm.data.Bounds;
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8 | import org.openstreetmap.josm.data.ProjectionBounds;
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9 | import org.openstreetmap.josm.data.coor.EastNorth;
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10 | import org.openstreetmap.josm.data.coor.ILatLon;
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11 | import org.openstreetmap.josm.data.coor.LatLon;
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12 | import org.openstreetmap.josm.data.osm.Node;
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13 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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14 | import org.openstreetmap.josm.data.osm.Relation;
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15 | import org.openstreetmap.josm.data.osm.RelationMember;
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16 | import org.openstreetmap.josm.data.osm.Way;
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17 | import org.openstreetmap.josm.gui.MainApplication;
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18 | import org.openstreetmap.josm.gui.MapFrame;
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19 |
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20 | /**
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21 | * Calculates the total bounding rectangle of a series of {@link OsmPrimitive} objects, using the
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22 | * EastNorth values as reference.
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23 | * @author imi
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24 | */
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25 | public class BoundingXYVisitor extends AbstractVisitor {
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26 |
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27 | private ProjectionBounds bounds;
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28 |
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29 | @Override
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30 | public void visit(Node n) {
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31 | visit((ILatLon) n);
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32 | }
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33 |
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34 | @Override
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35 | public void visit(Way w) {
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36 | if (w.isIncomplete()) return;
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37 | for (Node n : w.getNodes()) {
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38 | visit(n);
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39 | }
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40 | }
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41 |
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42 | @Override
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43 | public void visit(Relation e) {
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44 | // only use direct members
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45 | for (RelationMember m : e.getMembers()) {
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46 | if (!m.isRelation()) {
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47 | m.getMember().accept(this);
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48 | }
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49 | }
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50 | }
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51 |
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52 | /**
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53 | * Visiting call for bounds.
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54 | * @param b bounds
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55 | */
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56 | public void visit(Bounds b) {
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57 | if (b != null) {
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58 | b.visitEdge(Main.getProjection(), this::visit);
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59 | }
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60 | }
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61 |
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62 | /**
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63 | * Visiting call for projection bounds.
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64 | * @param b projection bounds
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65 | */
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66 | public void visit(ProjectionBounds b) {
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67 | if (b != null) {
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68 | visit(b.getMin());
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69 | visit(b.getMax());
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70 | }
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71 | }
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72 |
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73 | /**
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74 | * Visiting call for lat/lon.
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75 | * @param latlon lat/lon
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76 | * @since 12725 (public for ILatLon parameter)
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77 | */
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78 | public void visit(ILatLon latlon) {
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79 | if (latlon != null) {
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80 | visit(latlon.getEastNorth(Main.getProjection()));
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81 | }
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82 | }
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83 |
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84 | /**
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85 | * Visiting call for lat/lon.
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86 | * @param latlon lat/lon
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87 | */
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88 | public void visit(LatLon latlon) {
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89 | visit((ILatLon) latlon);
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90 | }
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91 |
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92 | /**
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93 | * Visiting call for east/north.
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94 | * @param eastNorth east/north
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95 | */
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96 | public void visit(EastNorth eastNorth) {
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97 | if (eastNorth != null) {
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98 | if (bounds == null) {
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99 | bounds = new ProjectionBounds(eastNorth);
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100 | } else {
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101 | bounds.extend(eastNorth);
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102 | }
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103 | }
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104 | }
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105 |
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106 | /**
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107 | * Determines if the visitor has a non null bounds area.
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108 | * @return {@code true} if the visitor has a non null bounds area
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109 | * @see ProjectionBounds#hasExtend
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110 | */
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111 | public boolean hasExtend() {
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112 | return bounds != null && bounds.hasExtend();
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113 | }
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114 |
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115 | /**
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116 | * @return The bounding box or <code>null</code> if no coordinates have passed
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117 | */
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118 | public ProjectionBounds getBounds() {
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119 | return bounds;
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120 | }
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121 |
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122 | /**
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123 | * Enlarges the calculated bounding box by 0.002 degrees.
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124 | * If the bounding box has not been set (<code>min</code> or <code>max</code>
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125 | * equal <code>null</code>) this method does not do anything.
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126 | */
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127 | public void enlargeBoundingBox() {
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128 | enlargeBoundingBox(Main.pref.getDouble("edit.zoom-enlarge-bbox", 0.002));
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129 | }
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130 |
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131 | /**
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132 | * Enlarges the calculated bounding box by the specified number of degrees.
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133 | * If the bounding box has not been set (<code>min</code> or <code>max</code>
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134 | * equal <code>null</code>) this method does not do anything.
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135 | *
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136 | * @param enlargeDegree number of degrees to enlarge on each side
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137 | */
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138 | public void enlargeBoundingBox(double enlargeDegree) {
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139 | if (bounds == null)
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140 | return;
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141 | LatLon minLatlon = Main.getProjection().eastNorth2latlon(bounds.getMin());
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142 | LatLon maxLatlon = Main.getProjection().eastNorth2latlon(bounds.getMax());
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143 | bounds = new ProjectionBounds(new LatLon(
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144 | Math.max(-90, minLatlon.lat() - enlargeDegree),
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145 | Math.max(-180, minLatlon.lon() - enlargeDegree)).getEastNorth(Main.getProjection()),
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146 | new LatLon(
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147 | Math.min(90, maxLatlon.lat() + enlargeDegree),
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148 | Math.min(180, maxLatlon.lon() + enlargeDegree)).getEastNorth(Main.getProjection()));
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149 | }
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150 |
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151 | /**
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152 | * Enlarges the bounding box up to <code>maxEnlargePercent</code>, depending on
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153 | * its size. If the bounding box is small, it will be enlarged more in relation
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154 | * to its beginning size. The larger the bounding box, the smaller the change,
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155 | * down to the minimum of 1% enlargement.
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156 | *
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157 | * Warning: if the bounding box only contains a single node, no expansion takes
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158 | * place because a node has no width/height. Use <code>enlargeToMinDegrees</code>
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159 | * instead.
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160 | *
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161 | * Example: You specify enlargement to be up to 100%.
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162 | *
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163 | * Bounding box is a small house: enlargement will be 95–100%, i.e.
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164 | * making enough space so that the house fits twice on the screen in
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165 | * each direction.
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166 | *
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167 | * Bounding box is a large landuse, like a forest: Enlargement will
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168 | * be 1–10%, i.e. just add a little border around the landuse.
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169 | *
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170 | * If the bounding box has not been set (<code>min</code> or <code>max</code>
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171 | * equal <code>null</code>) this method does not do anything.
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172 | *
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173 | * @param maxEnlargePercent maximum enlargement in percentage (100.0 for 100%)
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174 | */
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175 | public void enlargeBoundingBoxLogarithmically(double maxEnlargePercent) {
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176 | if (bounds == null)
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177 | return;
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178 |
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179 | double diffEast = bounds.getMax().east() - bounds.getMin().east();
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180 | double diffNorth = bounds.getMax().north() - bounds.getMin().north();
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181 |
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182 | double enlargeEast = Math.min(maxEnlargePercent - 10*Math.log(diffEast), 1)/100;
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183 | double enlargeNorth = Math.min(maxEnlargePercent - 10*Math.log(diffNorth), 1)/100;
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184 |
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185 | visit(bounds.getMin().add(-enlargeEast/2, -enlargeNorth/2));
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186 | visit(bounds.getMax().add(+enlargeEast/2, +enlargeNorth/2));
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187 | }
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188 |
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189 | /**
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190 | * Specify a degree larger than 0 in order to make the bounding box at least
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191 | * the specified size in width and height. The value is ignored if the
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192 | * bounding box is already larger than the specified amount.
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193 | *
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194 | * If the bounding box has not been set (<code>min</code> or <code>max</code>
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195 | * equal <code>null</code>) this method does not do anything.
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196 | *
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197 | * If the bounding box contains objects and is to be enlarged, the objects
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198 | * will be centered within the new bounding box.
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199 | *
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200 | * @param size minimum width and height in meter
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201 | */
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202 | public void enlargeToMinSize(double size) {
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203 | if (bounds == null)
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204 | return;
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205 | // convert size from meters to east/north units
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206 | MapFrame map = MainApplication.getMap();
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207 | double enSize = size * map.mapView.getScale() / map.mapView.getDist100Pixel() * 100;
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208 | visit(bounds.getMin().add(-enSize/2, -enSize/2));
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209 | visit(bounds.getMax().add(+enSize/2, +enSize/2));
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210 | }
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211 |
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212 | @Override
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213 | public String toString() {
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214 | return "BoundingXYVisitor["+bounds+']';
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215 | }
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216 |
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217 | /**
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218 | * Compute the bounding box of a collection of primitives.
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219 | * @param primitives the collection of primitives
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220 | */
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221 | public void computeBoundingBox(Collection<? extends OsmPrimitive> primitives) {
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222 | if (primitives == null) return;
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223 | for (OsmPrimitive p: primitives) {
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224 | if (p == null) {
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225 | continue;
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226 | }
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227 | p.accept(this);
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228 | }
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229 | }
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230 | }
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