1 | var prevOverlays = [];
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2 |
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3 | function undoMovement() {
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4 | console.log("*** undoMovement called");
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5 | for (var i = 0; i < overlays.length; i++) {
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6 | overlays[i].setMap(null);
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7 |
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8 | }
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9 |
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10 | overlays = [];
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11 |
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12 | var prev_overlay = prevOverlays.pop();
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13 |
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14 | for (var i = 0; i < prev_overlay.length; i++) {
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15 | overlays[i] = prev_overlay[i];
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16 | overlays[i].setMap(map);
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17 | }
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18 |
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19 | }
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20 |
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21 | function clonePath(path)
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22 | {
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23 | var clone_path = [];
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24 |
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25 | for (var i = 0; i < path.length; i++) {
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26 | var lati = path.getAt(i).lat();
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27 | var lngi = path.getAt(i).lng();
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28 | clone_lat_lng = {
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29 | lat: lati,
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30 | lng: lngi
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31 | };
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32 | clone_path.push(clone_lat_lng);
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33 | }
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34 |
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35 | return clone_path;
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36 | }
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37 |
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38 | function clonePolyline(polyline)
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39 | {
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40 | var path = polyline.getPath();
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41 | var geodesic = polyline.geodesic;
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42 | var strokeColor = polyline.strokeColor;
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43 | var strokeOpacity = polyline.strokeOpacity;
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44 | var strokeWeight = polyline.strokeWeight;
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45 |
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46 | var clone_path = clonePath(path);
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47 |
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48 | var clone_polyline = new google.maps.Polyline({
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49 | geodesic: geodesic,
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50 | strokeColor: strokeColor,
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51 | strokeOpacity: strokeOpacity,
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52 | strokeWeight: strokeWeight,
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53 | path: clone_path
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54 | });
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55 |
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56 | clone_polyline.type = google.maps.drawing.OverlayType.POLYLINE;
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57 |
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58 | return clone_polyline;
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59 | }
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60 |
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61 | function clonePolygon(polygon)
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62 | {
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63 | var path = polygon.getPath();
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64 | var geodesic = polygon.geodesic;
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65 | var strokeColor = polygon.strokeColor;
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66 | var strokeOpacity = polygon.strokeOpacity;
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67 | var strokeWeight = polygon.strokeWeight;
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68 | var fillColor = polygon.fillColor;
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69 | var fillOpacity = polygon.fillOpacity;
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70 |
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71 | var clone_path = clonePath(path);
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72 |
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73 | var clone_polygon = new google.maps.Polygon({
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74 | geodesic: geodesic,
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75 | strokeColor: strokeColor,
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76 | strokeOpacity: strokeOpacity,
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77 | strokeWeight: strokeWeight,
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78 | fillColor: fillColor,
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79 | fillOpacity: fillOpacity,
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80 | path: clone_path
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81 | });
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82 |
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83 | clone_polygon.type = google.maps.drawing.OverlayType.POLYGON;
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84 |
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85 | return clone_polygon;
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86 | }
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87 |
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88 | function cloneRectangle(rect)
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89 | {
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90 | var strokeColor = rect.strokeColor;
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91 | var strokeOpacity = rect.strokeOpacity;
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92 | var strokeWeight = rect.strokeWeight;
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93 | var fillColor = rect.fillColor;
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94 | var fillOpacity = rect.fillOpacity;
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95 | var bounds = rect.getBounds();
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96 |
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97 | var clone_rect = new google.maps.Rectangle({
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98 | strokeColor: strokeColor,
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99 | strokeOpacity: strokeOpacity,
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100 | strokeWeight: strokeWeight,
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101 | fillColor: fillColor,
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102 | fillOpacity: fillOpacity,
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103 | bounds: bounds
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104 | });
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105 |
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106 | clone_rect.type = google.maps.drawing.OverlayType.RECTANGLE;
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107 |
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108 | return clone_rect;
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109 | }
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110 |
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111 | function cloneCircle(circ)
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112 | {
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113 | var strokeColor = circ.strokeColor;
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114 | var strokeOpacity = circ.strokeOpacity;
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115 | var strokeWeight = circ.strokeWeight;
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116 | var fillColor = circ.fillColor;
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117 | var fillOpacity = circ.fillOpacity;
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118 | var center = circ.center;
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119 | var radius = circ.radius;
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120 |
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121 | var clone_circ = new google.maps.Circle({
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122 | strokeColor: strokeColor,
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123 | strokeOpacity: strokeOpacity,
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124 | strokeWeight: strokeWeight,
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125 | fillColor: fillColor,
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126 | fillOpacity: fillOpacity,
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127 | center: center,
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128 | radius: radius
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129 | });
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130 |
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131 | clone_circ.type = google.maps.drawing.OverlayType.CIRCLE;
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132 |
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133 | return clone_circ;
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134 | }
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135 |
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136 |
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137 | function cloneShape(shape)
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138 | {
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139 | if (shape.type === google.maps.drawing.OverlayType.POLYLINE) {
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140 | var clone_polyline = clonePolyline(shape);
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141 | return clone_polyline;
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142 | }
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143 | else if (shape.type === google.maps.drawing.OverlayType.POLYGON) {
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144 | var clone_polygon = clonePolygon(shape);
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145 | return clone_polygon;
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146 | }
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147 | else if (shape.type === google.maps.drawing.OverlayType.RECTANGLE) {
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148 | var clone_rect = cloneRectangle(shape);
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149 | return clone_rect;
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150 |
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151 | }
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152 | else if (shape.type === google.maps.drawing.OverlayType.CIRCLE) {
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153 | var clone_circ = cloneCircle(shape);
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154 | return clone_circ;
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155 |
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156 | }
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157 | else {
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158 | console.error("Unrecognized shape: " + shape);
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159 | return null;
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160 | }
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161 | }
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162 |
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163 | function historyOverlayPush()
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164 | {
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165 | console.log("historyOverlayPush()");
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166 | var overlays_copy = [];
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167 | for (var i = 0; i<overlays.length; i++) {
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168 | var clone_shape = cloneShape(overlays[i]);
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169 |
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170 | google.maps.event.addListener(clone_shape, 'click', function () {
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171 | setSelection(clone_shape);
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172 | });
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173 |
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174 | overlays_copy[i] = clone_shape;
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175 |
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176 | }
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177 |
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178 | prevOverlays.push(overlays_copy);
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179 | }
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