drawfeature.js

用来在地图上做操作GIS,在地图上做标记

/* Copyright (c) 2006-2007 MetaCarta, Inc., published under the BSD license.
 * See http://svn.openlayers.org/trunk/openlayers/release-license.txt 
 * for the full text of the license. */


/**
 * @requires OpenLayers/Control.js
 * @requires OpenLayers/Feature/Vector.js
 *
 * Class: OpenLayers.Control.DrawFeature
 * Draws features on a vector layer when active.
 *
 * Inherits from:
 *  - <OpenLayers.Control>
 */
OpenLayers.Control.DrawFeature = OpenLayers.Class(OpenLayers.Control, {
    
    /**
     * Property: layer
     * {<OpenLayers.Layer.Vector>}
     */
    layer: null,

    /**
     * Property: callbacks
     * {Object} The functions that are sent to the handler for callback
     */
    callbacks: null,
    
    /**
     * APIProperty: featureAdded
     * {Function} Called after each feature is added
     */
    featureAdded: function() {},

    /**
     * APIProperty: handlerOptions
     * {Object} Used to set non-default properties on the control's handler
     */
    handlerOptions: null,
    
    /**
     * Constructor: OpenLayers.Control.DrawFeature
     * 
     * Parameters:
     * layer - {<OpenLayers.Layer.Vector>} 
     * handler - {<OpenLayers.Handler>} 
     * options - {Object} 
     */
    initialize: function(layer, handler, options) {
        OpenLayers.Control.prototype.initialize.apply(this, [options]);
        this.callbacks = OpenLayers.Util.extend({done: this.drawFeature},
                                                this.callbacks);
        this.layer = layer;
        this.handler = new handler(this, this.callbacks, this.handlerOptions);
    },

    /**
     * Method: drawFeature
     */
    drawFeature: function(geometry) {
        var feature = new OpenLayers.Feature.Vector(geometry);
        this.layer.addFeatures([feature]);
        this.featureAdded(feature);
    },

    CLASS_NAME: "OpenLayers.Control.DrawFeature"
});