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785
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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 var geom;
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19
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20 var buttons = {
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21 addregion : {
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22 onclick : "setRegion",
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23 tooltip : "set a region",
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24 icon : "addregion.png"
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25 },
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26 delregion : {
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27 onclick : "removeRegion",
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28 tooltip : "delete the last region",
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29 icon : "delregion.png"
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30 },
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31 regions : {
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32 onclick : "toggleRegions",
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33 tooltip : "show or hide regions",
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34 icon : "regions.png"
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35 },
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36 regioninfo : {
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37 onclick : "infoRegions",
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38 tooltip : "information about regions",
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39 icon : "regioninfo.png"
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40 }
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41 };
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42 var regionSet = ['addregion', 'delregion', 'regions', 'regioninfo', 'lessoptions'];
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43
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44 var actions = {
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45 // define a region interactively with two clicked points
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46 "setRegion" : function(data) {
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47 $elem = data.$elem;
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48 $scaler = data.$scaler;
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49 var pt1, pt2;
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50 var $regionDiv = $('<div class="region" style="display:none"/>');
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51 $regionDiv.attr("id", "region" + data.regions.length);
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52 $elem.append($regionDiv);
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53 var picRect = geom.rectangle($scaler);
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54
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55 var regionStart = function (evt) {
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56 pt1 = geom.position(evt);
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57 // setup and show zoom div
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58 pt1.adjustDiv($regionDiv);
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59 $regionDiv.width(0).height(0);
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60 $regionDiv.show();
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61 // register events
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62 $elem.bind("mousemove.dlRegion", regionMove);
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63 $elem.bind("mouseup.dlRegion", regionEnd);
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64 return false;
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65 };
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66
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67 // mouse move handler
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68 var regionMove = function (evt) {
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69 pt2 = geom.position(evt);
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70 var rect = geom.rectangle(pt1, pt2);
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71 rect.clipTo(picRect);
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72 // update zoom div
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73 rect.adjustDiv($regionDiv);
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74 return false;
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75 };
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76
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77 // mouseup handler: end moving
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78 var regionEnd = function (evt) {
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79 pt2 = geom.position(evt);
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80 // assume a click and continue if the area is too small
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81 var clickRect = geom.rectangle(pt1, pt2);
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82 if (clickRect.getArea() <= 5) return false;
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83 // unregister events
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84 $elem.unbind("mousemove.dlRegion", regionMove);
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85 $elem.unbind("mouseup.dlRegion", regionEnd);
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86 // clip and transform
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87 clickRect.clipTo(picRect);
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88 clickRect.adjustDiv($regionDiv);
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89 data.regions.push($regionDiv);
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90 // fn.redisplay(data);
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91 return false;
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92 };
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93
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94 // clear old handler (also ZoomDrag)
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95 $scaler.unbind('.dlRegion');
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96 $elem.unbind('.dlRegion');
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97 // bind start zoom handler
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98 $scaler.one('mousedown.dlRegion', regionStart);
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99 },
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100
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101 // remove the last added region
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102 "removeRegion" : function (data) {
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103 var $regionDiv = data.regions.pop();
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104 $regionDiv.remove();
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105 // fn.redisplay(data);
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106 },
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107
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108 // add a region programmatically
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109 "addRegion" : function(data, pos, url) {
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110 // TODO: backlink mechanism
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111 if (pos.length === 4) {
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112 // TODO: trafo
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113 var $regionDiv = $('<div class="region" style="display:none"/>');
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114 $regionDiv.attr("id", "region" + i);
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115 var regionRect = geom.rectangle(pos[0], pos[1], pos[2], pos[3]);
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116 regionRect.adjustDiv($regionDiv);
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117 if (!data.regions) {
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118 data.regions = [];
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119 }
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120 data.regions.push($regionDiv);
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121 }
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122 }
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123 };
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124
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125 var addRegion = actions.addRegion;
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126
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127 var realizeRegions = function (data) {
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128 // create regions from parameters
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129 var settings = data.settings;
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130 var rg = settings.rg;
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131 var regions = rg.split(",");
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132 for (var i = 0; i < regions.length ; i++) {
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133 var pos = regions.split("/", 4);
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134 // TODO: backlink mechanism
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135 var url = paramString.match(/http.*$/);
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136 addRegion(data, pos, url);
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137 }
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138 };
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139
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140 // display current regions
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141 var renderRegions = function (data) {
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142 var regions = data.regions;
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143 for (var i = 0; i < regions.length; i++) {
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144 var region = regions[i];
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145 if (data.zoomArea.containsPosition(region)) {
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146 var rpos = data.imgTrafo.transform(region);
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147 console.debug("renderRegions: rpos=", rpos);
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148 // create region
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149 var $regionDiv = $('<div class="region" style="display:none"/>');
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150 $regionDiv.attr("id", "region" + data.regions.length);
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151 $elem.append($regionDiv);
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152 rpos.adjustDiv($regionDiv);
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153 }
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154 }
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155 };
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156
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157 var serializeRegions = function (data) {
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158 if (data.regions) {
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159 settings.rg = '';
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160 for (var i = 0; i < data.regions.length; i++) {
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161 if (i) {
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162 settings.rg += ',';
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163 }
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164 settings.rg +=
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165 cropFloat(data.regions[i].x).toString() + '/' +
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166 cropFloat(data.regions[i].y).toString() + '/' +
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167 cropFloat(data.regions[i].width).toString() + '/' +
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168 cropFloat(data.regions[i].height).toString();
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169 }
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170 }
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171 };
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172
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173 // export constructor functions to digilib plugin
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174 var init = function (digilibdata) {
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175 console.log('initialising regions plugin. data:', digilibdata);
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176 data = digilibdata;
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177 data.regions = [];
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178 // setup geometry object
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179 geom = data.plugins.geometry.init();
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180 // add buttons and actions from this plugin
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181 $.extend(this.buttons, buttons);
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182 $.extend(this.actions, actions);
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183 var buttonSettings = data.settings.buttonSettings.fullscreen;
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184 // configure buttons through digilib "regionSet" option
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185 var buttonSet = data.settings.regionSet || regionSet;
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186 // set regionSet to [] or '' for no buttons (when showing regions only)
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187 if (buttonSet.length && buttonSet.length > 0) {
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188 buttonSettings['regionSet'] = buttonSet;
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189 buttonSettings.buttonSets.push('regionSet');
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190 }
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191 fn = this.fn;
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192 // console.log(data.settings.buttonSettings.fullscreen.buttonSets);
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193 return {
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194 };
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195 };
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196 if ($.fn.digilib == null) {
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197 $.error("jquery.digilib.regions must be loaded after jquery.digilib!");
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198 } else {
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199 $.fn.digilib('plugin', {name : 'regions', init : init});
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200 }
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201 })(jQuery);
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