Changes between Initial Version and Version 1 of BluePrintGISSelectLocationFromMap

Timestamp:

08/08/10 07:11:36 (14 years ago)

Author:

Fran Boon

Comment:

--

BluePrintGISSelectLocationFromMap

@@ +1 @@
+== Select Location from Map ==
+
+Example code from Sahana Agasti, which needs a little bit of porting from PHP to Python, some adjustment to the !JavaScript variable names & then merging into the [wiki:DeveloperGuidelinesGIS#GuidelinesforDeveloperswishingtomakeuseofMappingwithintheirModule mapping API] in {{{modules/s3gis.py}}}:
+{{{
+var pointControl;
+
+// Add control to add new Points to the map.
+pointControl = new OpenLayers.Control.DrawFeature(featuresLayer, OpenLayers.Handler.Point);
+pointControl.featureAdded = shn_gis_map_add_geometry;
+map.addControl(pointControl);
+
+function shn_gis_map_control_add_point(){
+    shn_gis_map_control_deactivate_all();
+    document.getElementById('gis_map_icon_addpoint').style.backgroundImage = "url(res/OpenLayers/theme/default/img/draw_point_on.png)";
+    document.getElementById('gis_map_icon_descripion').innerHTML = '<?php echo  _t('Mode: Add Point') ?>';
+    pointControl.activate();
+}
+
+function shn_gis_map_add_geometry(feature){
+    var fcopy = feature.clone();
+    // need for later.
+    var fcopygeom = fcopy.geometry.clone();
+    var lonlat = fcopy.geometry.getBounds().getCenterLonLat();
+    var proj_current = map.getProjectionObject();
+    lonlat.transform(proj_current, proj4326);
+    var lon_new = lonlat.lon;
+    var lat_new = lonlat.lat;
+    var wkt_new = fcopy.geometry.transform(proj_current, proj4326).toString();
+    var type_new = featureTypeStr(fcopy);
+    
+    // Update form fields
+    var x_gps = document.getElementById("gps_x");
+    var y_gps = document.getElementById("gps_y");
+    if( x_gps != null && y_gps != null){
+        x_gps.value = lon_new;
+        y_gps.value = lat_new;
+    }
+
+    // store x,y coords in hidden variables named loc_x, loc_y
+    // must be set via calling page
+    var x_point = document.getElementsByName("loc_x");
+    var y_point = document.getElementsByName("loc_y");
+    if(x_point != null && y_point != null){
+        x_point[0].value = lon_new;
+        y_point[0].value = lat_new;
+    }
+    // store type
+    var loc_type = document.getElementsByName("loc_type");
+    if(loc_type != null){
+        loc_type[0].value = type_new;
+    }
+    // store wkt value
+    var wkt_point = document.getElementsByName("loc_wkt");
+    if(wkt_point != null){
+        wkt_point[0].value = wkt_new;
+    }
+    
+    // Remove last plot from layer
+    featuresLayer.destroyFeatures(featuresLayer.features);
+    
+    // Add marker for visual confirmation 
+    add_Feature(featuresLayer, 'newFeature', fcopygeom, '<?php echo  $icon ?>');
+}
+
+// Add marker to map
+function add_Feature(layer, feature_id, geom, iconURL){
+    // Set icon dims
+    var icon_img = new Image();
+    icon_img.src = iconURL;
+    var max_w = 25;
+    var max_h = 35;
+    var width = icon_img.width;
+    var height = icon_img.height;
+    if(width > max_w){
+        height = ((max_w / width) * height);
+        width = max_w;
+    }
+    if(height > max_h){
+        width = ((max_h / height) * width);
+        height = max_h;
+    }
+    // http://www.nabble.com/Markers-vs-Features--td16497389.html
+    var style_marker = OpenLayers.Util.extend({}, OpenLayers.Feature.Vector.style['default']);
+    //style_mark.pointRadius = 12;
+    style_marker.graphicWidth = width;
+    style_marker.graphicHeight = height;
+    style_marker.graphicXOffset = -(width / 2);
+    style_marker.graphicYOffset = -height;
+    style_marker.externalGraphic = iconURL;
+    style_marker.graphicOpacity = 1;
+    // Create Feature Vector + Props
+    var featureVec = new OpenLayers.Feature.Vector(geom, null, style_marker);
+    featureVec.fid = feature_id;
+    // Add Feature.
+    layer.addFeatures([featureVec]);
+}
+
+// Deactivate all other controls
+function shn_gis_map_control_deactivate_all(){
+    // Turn off navigate
+    var nav = document.getElementById('gis_map_icon_select')
+    if(nav != null){
+        nav.style.backgroundImage = "url(res/OpenLayers/theme/default/img/move_feature_off.png)";
+    }
+    // Turn off select
+    if(selectControl != null){
+        selectControl.unselectAll();
+        selectControl.deactivate();
+        document.getElementById('gis_map_icon_select').style.backgroundImage = "url(res/OpenLayers/theme/default/img/move_feature_off.png)";
+    }
+    // Turn off drag
+    if(dragControl != null){
+        dragControl.deactivate();
+        document.getElementById('gis_map_icon_drag').style.backgroundImage = "url(res/OpenLayers/theme/default/img/pan_off.png)";
+    }
+    // Turn off modify
+    //if(modifyControl != null){
+    //modifyControl.deactivate();
+    //}
+    // Drop features/popups in progress from a create feature.
+    if(currentFeature != null && ((pointControl != null && pointControl.active) || (lineControl != null && lineControl.active) || (polygonControl != null && polygonControl.active))){
+        if(currentFeature.popup != null){
+            currentFeature.popup.hide();
+            currentFeature.popup.destroy(currentFeature.popup);
+        }
+        featuresLayer.removeFeatures([currentFeature]);
+        currentFeature.destroy();
+        currentFeature = null;
+    }
+    // Hide any popup showing and deactivate current feature.
+    if(currentFeature != null){
+        if(currentFeature.popup != null){
+            currentFeature.popup.hide();
+        }
+        currentFeature = null;
+    }
+    // Turn off point add
+    if(pointControl != null){
+        pointControl.deactivate();
+        document.getElementById('gis_map_icon_addpoint').style.backgroundImage = "url(res/OpenLayers/theme/default/img/draw_point_off.png)";
+    }
+    // Turn off line add
+    if(lineControl != null){
+        lineControl.deactivate();
+        document.getElementById('gis_map_icon_addline').style.backgroundImage = "url(res/OpenLayers/theme/default/img/draw_line_off.png)";
+    }
+    // Turn off polygon add
+    if(polygonControl != null){
+        polygonControl.deactivate();
+        document.getElementById('gis_map_icon_addpolygon').style.backgroundImage = "url(res/OpenLayers/theme/default/img/draw_polygon_off.png)";
+    }
+}
+}}}
+
+----
+BluePrintGeographicInformationSystems
+
+[wiki:BluePrintsBeginners#GISMapping]
+
+[wiki:Taiwan]