[Mapbender-commits] r6112 - branches/3_dev/http/plugins

[svn_mapbender at osgeo.org]

Author: astrid_emde
Date: 2010-05-09 11:53:36 -0400 (Sun, 09 May 2010)
New Revision: 6112

Added:
   branches/3_dev/http/plugins/mod_mousewheelZoom.js
Log:
taken from trunk for mousewheel zoom

Added: branches/3_dev/http/plugins/mod_mousewheelZoom.js
===================================================================
--- branches/3_dev/http/plugins/mod_mousewheelZoom.js	                        (rev 0)
+++ branches/3_dev/http/plugins/mod_mousewheelZoom.js	2010-05-09 15:53:36 UTC (rev 6112)
@@ -0,0 +1,135 @@
+/**
+ * Package: mousewheelZoom
+ *
+ * Description:
+ * Zoom in/out with the mousewheel. Specify maps in target field.
+ * 
+ * Files:
+ *  - http/javascripts/mod_mousewheelZoom.js
+ *  - http/extensions/jquery.mousewheel.min.js
+ *
+ * SQL:
+ * > INSERT INTO gui_element(fkey_gui_id, e_id, e_pos, e_public, e_comment, 
+ * > e_title, e_element, e_src, e_attributes, e_left, e_top, e_width, 
+ * > e_height, e_z_index, e_more_styles, e_content, e_closetag, e_js_file, 
+ * > e_mb_mod, e_target, e_requires, e_url) VALUES('<gui_id>','mousewheelZoom',
+ * > 2,1,'adds mousewheel zoom to map module (target)','Mousewheel zoom',
+ * > 'div','','',NULL ,NULL ,NULL ,NULL ,NULL ,'','','div',
+ * > 'mod_mousewheelZoom.js','../extensions/jquery.mousewheel.min.js',
+ * > 'mapframe1','','');
+ * >
+ * > INSERT INTO gui_element_vars(fkey_gui_id, fkey_e_id, var_name, var_value, 
+ * > context, var_type) VALUES('<gui_id>', 'mousewheelZoom', 'factor', '2', 
+ * > 'The factor by which the map is zoomed on each mousewheel unit' ,'var');
+ *
+ * Help:
+ * http://www.mapbender.org/MousewheelZoom
+ *
+ * Maintainer:
+ * http://www.mapbender.org/User:Christoph_Baudson
+ * 
+ * Parameters:
+ * factor    - *[optional]* {Float} The factor by which the map is zoomed on 
+ * 					each mousewheel unit. Default is 2.
+ *
+ * License:
+ * Copyright (c) 2009, Open Source Geospatial Foundation
+ * This program is dual licensed under the GNU General Public License 
+ * and Simplified BSD license.  
+ * http://svn.osgeo.org/mapbender/trunk/mapbender/license/license.txt
+ */
+
+ 
+if (options.factor === undefined) {
+	options.factor = 2;
+}
+
+Mapbender.events.init.register(function () {
+
+	for (var i in options.target) {
+		(function () {
+		
+			var currentTarget = options.target[i];
+	
+			var mapTimeout;
+			var sum_delta = 0;
+			var lastTimestamp;
+			var lastScrollPosition;
+			var zoomMousewheel = options.factor;
+		
+			var mapObject = Mapbender.modules[currentTarget];
+			mapObject.mousewheelZoom = function () {
+				var currentTime = new Date();
+			
+				if (currentTime.getTime() - lastTimestamp > 200) {
+					if (lastScrollPosition !== null) {
+						var pos = mapObject.convertPixelToReal(lastScrollPosition);
+			
+						if (sum_delta > 0) {
+							var extentAfterZoom = mapObject.calculateExtentAfterZoom(
+								true, 
+								Math.pow(zoomMousewheel, sum_delta), 
+								pos.x, 
+								pos.y
+							);
+						}
+						else {
+							var extentAfterZoom = mapObject.calculateExtentAfterZoom(
+								false, 
+								Math.pow(zoomMousewheel, -sum_delta), 
+								pos.x, 
+								pos.y
+							);
+						}
+
+						var newPos = mapObject.convertRealToPixel(
+							pos,
+							extentAfterZoom
+						);
+						var diff = newPos.minus(lastScrollPosition);
+						
+						var newSouthEast = mapObject.convertPixelToReal(
+							(new Mapbender.Point(0, mapObject.getHeight())).plus(diff),
+							extentAfterZoom
+						);
+						var newNorthWest = mapObject.convertPixelToReal(
+							(new Mapbender.Point(mapObject.getWidth(), 0)).plus(diff),
+							extentAfterZoom
+						);
+						var newExtent = new Mapbender.Extent(newSouthEast, newNorthWest);
+						mapObject.setExtent(newExtent);
+						mapObject.setMapRequest();
+					}			
+					sum_delta = 0;
+					clearTimeout(mapTimeout);
+				}
+				else {
+					var that = this;
+					mapTimeout = setTimeout(function () {
+							that.mousewheelZoom();	
+						}, 
+						100
+					);
+				}
+			};
+		
+			//
+			// add mousewheel behaviour
+			//
+			$("#" + currentTarget).mousewheel(function (e, delta) {
+				if (sum_delta == 0) {
+					mapTimeout = setTimeout(function () {
+							lastScrollPosition = mapObject.getMousePosition(e);
+							mapObject.mousewheelZoom();	
+						}, 
+						100);
+				}
+				sum_delta = sum_delta + (delta);
+				var currentTime = new Date();
+				lastTimestamp = currentTime.getTime();
+				
+				return false;
+			});
+		}());
+	}
+});