Add overview myway timeliness table
[busui.git] / labs / openlayers / lib / OpenLayers / Handler / Polygon.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
/* 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"
});