Mercurial > hg > digilib-old

annotate client/digitallibrary/jquery/jquery.digilib.regions.js @ 799:12f790cb30de jquery

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started to adapt regions plugin to new plugin mechanism
author hertzhaft
date Fri, 18 Feb 2011 23:13:26 +0100
parents d742bd92b05a
children ae8e98c479d5
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1 /** optional digilib regions plugin
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2
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3 markup a digilib image with rectangular regions
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4
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5 TODO:
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6 - store region in params/cookie, regarding zoom, mirror, rotation (like marks)
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7 - set regions programmatically
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8 - read regions from params/cookie and display
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9 - backlink mechanism
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10 - don't write to data.settings?
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11 */
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12
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13 (function($) {
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14 // the data object passed by digilib
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15 var data;
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16 var buttons;
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17 var fn;
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18 // affine geometry plugin stub
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19 var geom;
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20
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21 var FULL_AREA;
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22
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23 var buttons = {
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24 addregion : {
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25 onclick : "setRegion",
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26 tooltip : "set a region",
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27 icon : "addregion.png"
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28 },
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29 delregion : {
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30 onclick : "removeRegion",
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31 tooltip : "delete the last region",
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32 icon : "delregion.png"
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33 },
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34 regions : {
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35 onclick : "toggleRegions",
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36 tooltip : "show or hide regions",
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37 icon : "regions.png"
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38 },
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39 regioninfo : {
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40 onclick : "infoRegions",
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41 tooltip : "information about regions",
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42 icon : "regioninfo.png"
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43 }
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44 };
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45
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46 var defaults = {
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47 // are regions shown?
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48 'isRegionVisible' : true,
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49 // buttonset of this plugin
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50 'regionSet' : ['addregion', 'delregion', 'regions', 'regioninfo', 'lessoptions'],
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51 // array of defined regions
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52 'regions' : []
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53 };
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54
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55 var actions = {
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56 // define a region interactively with two clicked points
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57 "setRegion" : function(data) {
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58 var $elem = data.$elem;
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59 var $scaler = data.$scaler;
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60 var picRect = geom.rectangle($scaler);
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61 var pt1, pt2;
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62 // TODO: temporary rectangle only, pass values to "addRegion" factory
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63 var $tempDiv = $('<div class="region" style="display:none"/>');
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64 $elem.append($tempDiv);
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65
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66 var regionStart = function (evt) {
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67 pt1 = geom.position(evt);
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68 // setup and show zoom div
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69 pt1.adjustDiv($tempDiv);
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70 $tempDiv.width(0).height(0);
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71 $tempDiv.show();
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72 // register events
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73 $elem.bind("mousemove.dlRegion", regionMove);
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74 $elem.bind("mouseup.dlRegion", regionEnd);
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75 return false;
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76 };
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77
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78 // mouse move handler
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79 var regionMove = function (evt) {
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80 pt2 = geom.position(evt);
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81 var rect = geom.rectangle(pt1, pt2);
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82 rect.clipTo(picRect);
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83 // update zoom div
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84 rect.adjustDiv($tempDiv);
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85 return false;
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86 };
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87
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88 // mouseup handler: end moving
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89 var regionEnd = function (evt) {
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90 pt2 = geom.position(evt);
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91 // assume a click and continue if the area is too small
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92 var clickRect = geom.rectangle(pt1, pt2);
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93 if (clickRect.getArea() <= 5) return false;
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94 // unregister events
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95 $elem.unbind("mousemove.dlRegion", regionMove);
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96 $elem.unbind("mouseup.dlRegion", regionEnd);
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97 // clip and transform
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98 clickRect.clipTo(picRect);
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99 clickRect.adjustDiv($tempDiv);
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100 $tempDiv.remove();
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101 data.settings.regions.push(clickRect);
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102 // fn.redisplay(data);
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103 return false;
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104 };
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105
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106 // clear old handler (also ZoomDrag)
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107 $scaler.unbind('.dlRegion');
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108 $elem.unbind('.dlRegion');
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109 // bind start zoom handler
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110 $scaler.one('mousedown.dlRegion', regionStart);
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111 },
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112
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113 // remove the last added region
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114 "removeRegion" : function (data) {
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115 var $regionDiv = data.settings.regions.pop();
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116 $regionDiv.remove();
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117 // fn.redisplay(data);
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118 },
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119
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120 // add a region programmatically
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121 "addRegion" : function(data, pos, url) {
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122 // TODO: backlink mechanism
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123 if (pos.length === 4) {
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124 // TODO: trafo
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125 var $regionDiv = $('<div class="region" style="display:none"/>');
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126 $regionDiv.attr("id", "region" + i);
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127 var regionRect = geom.rectangle(pos[0], pos[1], pos[2], pos[3]);
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128 regionRect.adjustDiv($regionDiv);
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129 if (!data.regions) {
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130 data.regions = [];
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131 }
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132 data.regions.push($regionDiv);
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133 }
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134 }
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135 };
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136
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137 var addRegion = actions.addRegion;
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138
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139 var realizeRegions = function (data) {
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140 // create regions from parameters
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141 var settings = data.settings;
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142 var rg = settings.rg;
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143 var regions = rg.split(",");
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144 for (var i = 0; i < regions.length ; i++) {
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145 var pos = regions.split("/", 4);
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146 // TODO: backlink mechanism
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147 var url = paramString.match(/http.*$/);
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148 addRegion(data, pos, url);
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149 }
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150 };
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151
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152 // display current regions
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153 var renderRegions = function (data) {
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154 var regions = data.regions;
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155 for (var i = 0; i < regions.length; i++) {
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156 var region = regions[i];
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157 if (data.zoomArea.containsPosition(region)) {
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158 var rpos = data.imgTrafo.transform(region);
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159 console.debug("renderRegions: rpos=", rpos);
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160 // create region
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161 var $regionDiv = $('<div class="region" style="display:none"/>');
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162 $regionDiv.attr("id", "region" + data.regions.length);
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163 $elem.append($regionDiv);
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164 rpos.adjustDiv($regionDiv);
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165 }
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166 }
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167 };
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168
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169 var serializeRegions = function (data) {
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170 if (data.regions) {
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171 settings.rg = '';
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172 for (var i = 0; i < data.regions.length; i++) {
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173 if (i) {
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174 settings.rg += ',';
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175 }
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176 settings.rg +=
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177 cropFloat(data.regions[i].x).toString() + '/' +
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178 cropFloat(data.regions[i].y).toString() + '/' +
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179 cropFloat(data.regions[i].width).toString() + '/' +
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180 cropFloat(data.regions[i].height).toString();
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181 }
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182 }
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183 };
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184
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185 var handleSetup = function (evt) {
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186 console.debug("regions: handleSetup");
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187 data = this;
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188 // if (data.settings.isBirdDivVisible) {
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189 // setupBirdDiv(data);
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190 // data.$birdDiv.show();
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191 // }
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192 };
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193
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194 var handleUpdate = function (evt) {
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195 console.debug("regions: handleUpdate");
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196 data = this;
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197 // if (data.settings.isBirdDivVisible) {
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198 // renderBirdArea(data);
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199 // setupBirdDrag(data);
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200 // }
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201 };
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202
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203 var handleRedisplay = function (evt) {
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204 console.debug("regions: handleRedisplay");
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205 data = this;
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206 // if (data.settings.isBirdDivVisible) {
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207 // updateBirdDiv(data);
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208 // }
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209 };
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210
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211 var handleDragZoom = function (evt, zoomArea) {
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212 console.debug("regions: handleDragZoom, zoomArea:", zoomArea);
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213 data = this;
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214 // if (data.settings.isBirdDivVisible) {
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215 // setBirdZoom(data, zoomArea);
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216 // }
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217 };
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218
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219 // plugin installation called by digilib on plugin object.
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220 var install = function(digilib) {
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221 // import geometry classes
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222 geom = digilib.fn.geometry;
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223 FULL_AREA = geom.rectangle(0,0,1,1);
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224 // add defaults
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225 $.extend(digilib.defaults, defaults);
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226 // add actions
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227 $.extend(digilib.actions, actions);
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228 // add buttons
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229 $.extend(digilib.buttons, buttons);
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230 };
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231
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232 // plugin initialization
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233 var init = function (data) {
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234 console.debug('initialising regions plugin. data:', data);
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235 var $data = $(data);
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236 var buttonSettings = data.settings.buttonSettings.fullscreen;
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237 // configure buttons through digilib "regionSet" option
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238 var buttonSet = data.settings.regionSet || regionSet;
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239 // set regionSet to [] or '' for no buttons (when showing regions only)
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240 if (buttonSet.length && buttonSet.length > 0) {
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241 buttonSettings['regionSet'] = buttonSet;
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242 buttonSettings.buttonSets.push('regionSet');
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243 }
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244 // install event handler
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245 $data.bind('setup', handleSetup);
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246 $data.bind('update', handleUpdate);
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247 $data.bind('redisplay', handleRedisplay);
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248 $data.bind('dragZoom', handleDragZoom);
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249 };
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250
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251 // plugin object with name and init
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252 // shared objects filled by digilib on registration
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253 var pluginProperties = {
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254 name : 'region',
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255 install : install,
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256 init : init,
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257 buttons : {},
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258 actions : {},
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259 fn : {},
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260 plugins : {}
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261 };
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262
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263 if ($.fn.digilib == null) {
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264 $.error("jquery.digilib.birdview must be loaded after jquery.digilib!");
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265 } else {
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266 $.fn.digilib('plugin', pluginProperties);
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267 }
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268 })(jQuery);