Add overview myway timeliness table
[busui.git] / labs / openlayers / lib / OpenLayers / Control / Snapping.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
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
/* 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/Control.js
 * @requires OpenLayers/Layer/Vector.js
 */
 
/**
 * Class: OpenLayers.Control.Snapping
 * Acts as a snapping agent while editing vector features.
 *
 * Inherits from:
 *  - <OpenLayers.Control>
 */
OpenLayers.Control.Snapping = OpenLayers.Class(OpenLayers.Control, {
 
    /**
     * Constant: EVENT_TYPES
     * {Array(String)} Supported application event types.  Register a listener
     *     for a particular event with the following syntax:
     * (code)
     * control.events.register(type, obj, listener);
     * (end)
     *
     * Listeners will be called with a reference to an event object.  The
     *     properties of this event depends on exactly what happened.
     *
     * Supported control event types (in addition to those from <OpenLayers.Control>):
     * beforesnap - Triggered before a snap occurs.  Listeners receive an
     *     event object with *point*, *x*, *y*, *distance*, *layer*, and
     *     *snapType* properties.  The point property will be original point
     *     geometry considered for snapping. The x and y properties represent
     *     coordinates the point will receive. The distance is the distance
     *     of the snap.  The layer is the target layer.  The snapType property
     *     will be one of "node", "vertex", or "edge". Return false to stop
     *     snapping from occurring.
     * snap - Triggered when a snap occurs.  Listeners receive an event with
     *     *point*, *snapType*, *layer*, and *distance* properties.  The point
     *     will be the location snapped to.  The snapType will be one of "node",
     *     "vertex", or "edge".  The layer will be the target layer.  The
     *     distance will be the distance of the snap in map units.
     * unsnap - Triggered when a vertex is unsnapped.  Listeners receive an
     *     event with a *point* property.
     */
    EVENT_TYPES: ["beforesnap", "snap", "unsnap"],
    
    /**
     * CONSTANT: DEFAULTS
     * Default target properties.
     */
    DEFAULTS: {
        tolerance: 10,
        node: true,
        edge: true,
        vertex: true
    },
    
    /**
     * Property: greedy
     * {Boolean} Snap to closest feature in first layer with an eligible
     *     feature.  Default is true.
     */
    greedy: true,
    
    /**
     * Property: precedence
     * {Array} List representing precedence of different snapping types.
     *     Default is "node", "vertex", "edge".
     */
    precedence: ["node", "vertex", "edge"],
    
    /**
     * Property: resolution
     * {Float} The map resolution for the previously considered snap.
     */
    resolution: null,
    
    /**
     * Property: geoToleranceCache
     * {Object} A cache of geo-tolerances.  Tolerance values (in map units) are
     *     calculated when the map resolution changes.
     */
    geoToleranceCache: null,
    
    /**
     * Property: layer
     * {<OpenLayers.Layer.Vector>} The current editable layer.  Set at
     *     construction or after construction with <setLayer>.
     */
    layer: null,
    
    /**
     * Property: feature
     * {<OpenLayers.Feature.Vector>} The current editable feature.
     */
    feature: null,
    
    /**
     * Property: point
     * {<OpenLayers.Geometry.Point>} The currently snapped vertex.
     */
    point: null,
 
    /**
     * Constructor: OpenLayers.Control.Snapping
     * Creates a new snapping control. A control is constructed with an editable
     *     layer and a set of configuration objects for target layers. While the
     *     control is active, dragging vertices while drawing new features or
     *     modifying existing features on the editable layer will engage
     *     snapping to features on the target layers. Whether a vertex snaps to
     *     a feature on a target layer depends on the target layer configuration.
     *
     * Parameters:
     * options - {Object} An object containing all configuration properties for
     *     the control.
     *
     * Valid options:
     * layer - {OpenLayers.Layer.Vector} The editable layer.  Features from this
     *     layer that are digitized or modified may have vertices snapped to
     *     features from any of the target layers.
     * targets - {Array(Object | OpenLayers.Layer.Vector)} A list of objects for
     *     configuring target layers.  See valid properties of the target
     *     objects below.  If the items in the targets list are vector layers
     *     (instead of configuration objects), the defaults from the <defaults>
     *     property will apply.  The editable layer itself may be a target
     *     layer - allowing newly created or edited features to be snapped to
     *     existing features from the same layer.  If no targets are provided
     *     the layer given in the constructor (as <layer>) will become the
     *     initial target.
     * defaults - {Object} An object with default properties to be applied
     *     to all target objects.
     * greedy - {Boolean} Snap to closest feature in first target layer that
     *     applies.  Default is true.  If false, all features in all target
     *     layers will be checked and the closest feature in all target layers
     *     will be chosen.  The greedy property determines if the order of the
     *     target layers is significant.  By default, the order of the target
     *     layers is significant where layers earlier in the target layer list
     *     have precedence over layers later in the list.  Within a single
     *     layer, the closest feature is always chosen for snapping.  This
     *     property only determines whether the search for a closer feature
     *     continues after an eligible feature is found in a target layer.
     *
     * Valid target properties:
     * layer - {OpenLayers.Layer.Vector} A target layer.  Features from this
     *     layer will be eligible to act as snapping target for the editable
     *     layer.
     * tolerance - {Float} The distance (in pixels) at which snapping may occur.
     *     Default is 10.
     * node - {Boolean} Snap to nodes (first or last point in a geometry) in
     *     target layer.  Default is true.
     * nodeTolerance - {Float} Optional distance at which snapping may occur
     *     for nodes specifically.  If none is provided, <tolerance> will be
     *     used.
     * vertex - {Boolean} Snap to vertices in target layer.  Default is true.
     * vertexTolerance - {Float} Optional distance at which snapping may occur
     *     for vertices specifically.  If none is provided, <tolerance> will be
     *     used.
     * edge - {Boolean} Snap to edges in target layer.  Default is true.
     * edgeTolerance - {Float} Optional distance at which snapping may occur
     *     for edges specifically.  If none is provided, <tolerance> will be
     *     used.
     * filter - {OpenLayers.Filter} Optional filter to evaluate to determine if
     *     feature is eligible for snapping.  If filter evaluates to true for a
     *     target feature a vertex may be snapped to the feature. 
     */
    initialize: function(options) {
        // concatenate events specific to measure with those from the base
        Array.prototype.push.apply(
            this.EVENT_TYPES, OpenLayers.Control.prototype.EVENT_TYPES
        );
        OpenLayers.Control.prototype.initialize.apply(this, [options]);
        this.options = options || {}; // TODO: this could be done by the super
        
        // set the editable layer if provided
        if(this.options.layer) {
            this.setLayer(this.options.layer);
        }
        // configure target layers
        var defaults = OpenLayers.Util.extend({}, this.options.defaults);
        this.defaults = OpenLayers.Util.applyDefaults(defaults, this.DEFAULTS);
        this.setTargets(this.options.targets);
        if(this.targets.length === 0 && this.layer) {
            this.addTargetLayer(this.layer);
        }
 
        this.geoToleranceCache = {};
    },
    
    /**
     * APIMethod: setLayer
     * Set the editable layer.  Call the setLayer method if the editable layer
     *     changes and the same control should be used on a new editable layer.
     *     If the control is already active, it will be active after the new
     *     layer is set.
     *
     * Parameters:
     * layer - {OpenLayers.Layer.Vector}  The new editable layer.
     */
    setLayer: function(layer) {
        if(this.active) {
            this.deactivate();
            this.layer = layer;
            this.activate();
        } else {
            this.layer = layer;
        }
    },
    
    /**
     * Method: setTargets
     * Set the targets for the snapping agent.
     *
     * Parameters:
     * targets - {Array} An array of target configs or target layers.
     */
    setTargets: function(targets) {
        this.targets = [];
        if(targets && targets.length) {
            var target;
            for(var i=0, len=targets.length; i<len; ++i) {
                target = targets[i];
                if(target instanceof OpenLayers.Layer.Vector) {
                    this.addTargetLayer(target);
                } else {
                    this.addTarget(target);
                }
            }
        }
    },
    
    /**
     * Method: addTargetLayer
     * Add a target layer with the default target config.
     *
     * Parameters:
     * layer - {<OpenLayers.Layer.Vector>} A target layer.
     */
    addTargetLayer: function(layer) {
        this.addTarget({layer: layer});
    },
    
    /**
     * Method: addTarget
     * Add a configured target layer.
     *
     * Parameters:
     * target - {Object} A target config.
     */
    addTarget: function(target) {
        target = OpenLayers.Util.applyDefaults(target, this.defaults);
        target.nodeTolerance = target.nodeTolerance || target.tolerance;
        target.vertexTolerance = target.vertexTolerance || target.tolerance;
        target.edgeTolerance = target.edgeTolerance || target.tolerance;
        this.targets.push(target);
    },
    
    /**
     * Method: removeTargetLayer
     * Remove a target layer.
     *
     * Parameters:
     * layer - {<OpenLayers.Layer.Vector>} The target layer to remove.
     */
    removeTargetLayer: function(layer) {
        var target;
        for(var i=this.targets.length-1; i>=0; --i) {
            target = this.targets[i];
            if(target.layer === layer) {
                this.removeTarget(target);
            }
        }
    },
    
    /**
     * Method: removeTarget
     * Remove a target.
     *
     * Parameters:
     * target - {Object} A target config.
     *
     * Returns:
     * {Array} The targets array.
     */
    removeTarget: function(target) {
        return OpenLayers.Util.removeItem(this.targets, target);
    },
    
    /**
     * APIMethod: activate
     * Activate the control.  Activating the control registers listeners for
     *     editing related events so that during feature creation and
     *     modification, moving vertices will trigger snapping.
     */
    activate: function() {
        var activated = OpenLayers.Control.prototype.activate.call(this);
        if(activated) {
            if(this.layer && this.layer.events) {
                this.layer.events.on({
                    sketchstarted: this.onSketchModified,
                    sketchmodified: this.onSketchModified,
                    vertexmodified: this.onVertexModified,
                    scope: this
                });
            }
        }
        return activated;
    },
    
    /**
     * APIMethod: deactivate
     * Deactivate the control.  Deactivating the control unregisters listeners
     *     so feature editing may proceed without engaging the snapping agent.
     */
    deactivate: function() {
        var deactivated = OpenLayers.Control.prototype.deactivate.call(this);
        if(deactivated) {
            if(this.layer && this.layer.events) {
                this.layer.events.un({
                    sketchstarted: this.onSketchModified,
                    sketchmodified: this.onSketchModified,
                    vertexmodified: this.onVertexModified,
                    scope: this
                });
            }
        }
        this.feature = null;
        this.point = null;
        return deactivated;
    },
    
    /**
     * Method: onSketchModified
     * Registered as a listener for the sketchmodified event on the editable
     *     layer.
     *
     * Parameters:
     * event - {Object} The sketch modified event.
     */
    onSketchModified: function(event) {
        this.feature = event.feature;
        this.considerSnapping(event.vertex, event.vertex);
    },
    
    /**
     * Method: onVertexModified
     * Registered as a listener for the vertexmodified event on the editable
     *     layer.
     *
     * Parameters:
     * event - {Object} The vertex modified event.
     */
    onVertexModified: function(event) {
        this.feature = event.feature;
        var loc = this.layer.map.getLonLatFromViewPortPx(event.pixel);
        this.considerSnapping(
            event.vertex, new OpenLayers.Geometry.Point(loc.lon, loc.lat)
        );
    },
 
    /**
     * Method: considerSnapping
     *
     * Parameters:
     * point - {<OpenLayers.Geometry.Point}} The vertex to be snapped (or
     *     unsnapped).
     * loc - {<OpenLayers.Geometry.Point>} The location of the mouse in map
     *     coords.
     */
    considerSnapping: function(point, loc) {
        var best = {
            rank: Number.POSITIVE_INFINITY,
            dist: Number.POSITIVE_INFINITY,
            x: null, y: null
        };
        var snapped = false;
        var result, target;
        for(var i=0, len=this.targets.length; i<len; ++i) {
            target = this.targets[i];
            result = this.testTarget(target, loc);
            if(result) {
                if(this.greedy) {
                    best = result;
                    best.target = target; 
                    snapped = true;
                    break;
                } else {
                    if((result.rank < best.rank) ||
                       (result.rank === best.rank && result.dist < best.dist)) {
                        best = result;
                        best.target = target;
                        snapped = true;
                    }
                }
            }
        }
        if(snapped) {
            var proceed = this.events.triggerEvent("beforesnap", {
                point: point, x: best.x, y: best.y, distance: best.dist,
                layer: best.target.layer, snapType: this.precedence[best.rank]
            });
            if(proceed !== false) {
                point.x = best.x;
                point.y = best.y;
                this.point = point;
                this.events.triggerEvent("snap", {
                    point: point,
                    snapType: this.precedence[best.rank],
                    layer: best.target.layer,
                    distance: best.dist
                });
            } else {
                snapped = false;
            }
        }
        if(this.point && !snapped) {
            point.x = loc.x;
            point.y = loc.y;
            this.point = null;
            this.events.triggerEvent("unsnap", {point: point});
        }
    },
    
    /**
     * Method: testTarget
     *
     * Parameters:
     * target - {Object} Object with target layer configuration.
     * loc - {<OpenLayers.Geometry.Point>} The location of the mouse in map
     *     coords.
     *
     * Returns:
     * {Object} A result object with rank, dist, x, and y properties.
     *     Returns null if candidate is not eligible for snapping.
     */
    testTarget: function(target, loc) {
        var tolerance = {
            node: this.getGeoTolerance(target.nodeTolerance),
            vertex: this.getGeoTolerance(target.vertexTolerance),
            edge: this.getGeoTolerance(target.edgeTolerance)
        };
        // this could be cached if we don't support setting tolerance values directly
        var maxTolerance = Math.max(
            tolerance.node, tolerance.vertex, tolerance.edge
        )</