| /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for | |
| * full list of contributors). Published under the Clear BSD license. | |
| * See http://svn.openlayers.org/trunk/openlayers/license.txt for the | |
| * full text of the license. */ | |
| /** | |
| * @requires OpenLayers/Handler/Path.js | |
| * @requires OpenLayers/Geometry/Polygon.js | |
| */ | |
| /** | |
| * Class: OpenLayers.Handler.Polygon | |
| * Handler to draw a polygon on the map. Polygon is displayed on mouse down, | |
| * moves on mouse move, and is finished on mouse up. | |
| * | |
| * Inherits from: | |
| * - <OpenLayers.Handler.Path> | |
| * - <OpenLayers.Handler> | |
| */ | |
| OpenLayers.Handler.Polygon = OpenLayers.Class(OpenLayers.Handler.Path, { | |
| /** | |
| * Parameter: polygon | |
| * {<OpenLayers.Feature.Vector>} | |
| */ | |
| polygon: null, | |
| /** | |
| * Constructor: OpenLayers.Handler.Polygon | |
| * Create a Polygon Handler. | |
| * | |
| * Parameters: | |
| * control - {<OpenLayers.Control>} The control that owns this handler | |
| * callbacks - {Object} An object with a properties whose values are | |
| * functions. Various callbacks described below. | |
| * options - {Object} An optional object with properties to be set on the | |
| * handler | |
| * | |
| * Named callbacks: | |
| * create - Called when a sketch is first created. Callback called with | |
| * the creation point geometry and sketch feature. | |
| * modify - Called with each move of a vertex with the vertex (point) | |
| * geometry and the sketch feature. | |
| * point - Called as each point is added. Receives the new point geometry. | |
| * done - Called when the point drawing is finished. The callback will | |
| * recieve a single argument, the polygon geometry. | |
| * cancel - Called when the handler is deactivated while drawing. The | |
| * cancel callback will receive a geometry. | |
| */ | |
| initialize: function(control, callbacks, options) { | |
| OpenLayers.Handler.Path.prototype.initialize.apply(this, arguments); | |
| }, | |
| /** | |
| * Method: createFeature | |
| * Add temporary geometries | |
| * | |
| * Parameters: | |
| * pixel - {<OpenLayers.Pixel>} The initial pixel location for the new | |
| * feature. | |
| */ | |
| createFeature: function(pixel) { | |
| var lonlat = this.control.map.getLonLatFromPixel(pixel); | |
| this.point = new OpenLayers.Feature.Vector( | |
| new OpenLayers.Geometry.Point(lonlat.lon, lonlat.lat) | |
| ); | |
| this.line = new OpenLayers.Feature.Vector( | |
| new OpenLayers.Geometry.LinearRing([this.point.geometry]) | |
| ); | |
| this.polygon = new OpenLayers.Feature.Vector( | |
| new OpenLayers.Geometry.Polygon([this.line.geometry]) | |
| ); | |
| this.callback("create", [this.point.geometry, this.getSketch()]); | |
| this.point.geometry.clearBounds(); | |
| this.layer.addFeatures([this.polygon, this.point], {silent: true}); | |
| }, | |
| /** | |
| * Method: destroyFeature | |
| * Destroy temporary geometries | |
| */ | |
| destroyFeature: function() { | |
| OpenLayers.Handler.Path.prototype.destroyFeature.apply(this); | |
| this.polygon = null; | |
| }, | |
| /** | |
| * Method: drawFeature | |
| * Render geometries on the temporary layer. | |
| */ | |
| drawFeature: function() { | |
| this.layer.drawFeature(this.polygon, this.style); | |
| this.layer.drawFeature(this.point, this.style); | |
| }, | |
| /** | |
| * Method: getSketch | |
| * Return the sketch feature. | |
| * | |
| * Returns: | |
| * {<OpenLayers.Feature.Vector>} | |
| */ | |
| getSketch: function() { | |
| return this.polygon; | |
| }, | |
| /** | |
| * Method: getGeometry | |
| * Return the sketch geometry. If <multi> is true, this will return | |
| * a multi-part geometry. | |
| * | |
| * Returns: | |
| * {<OpenLayers.Geometry.Polygon>} | |
| */ | |
| getGeometry: function() { | |
| var geometry = this.polygon && this.polygon.geometry; | |
| if(geometry && this.multi) { | |
| geometry = new OpenLayers.Geometry.MultiPolygon([geometry]); | |
| } | |
| return geometry; | |
| }, | |
| /** | |
| * Method: dblclick | |
| * Handle double-clicks. Finish the geometry and send it back | |
| * to the control. | |
| * | |
| * Parameters: | |
| * evt - {Event} | |
| */ | |
| dblclick: function(evt) { | |
| if(!this.freehandMode(evt)) { | |
| // remove the penultimate point | |
| var index = this.line.geometry.components.length - 2; | |
| this.line.geometry.removeComponent(this.line.geometry.components[index]); | |
| this.removePoint(); | |
| this.finalize(); | |
| } | |
| return false; | |
| }, | |
| CLASS_NAME: "OpenLayers.Handler.Polygon" | |
| }); | |