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 | 1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
31×
31×
31×
31×
31×
1×
1×
8×
8×
8×
8×
17×
8×
8×
24×
51×
51×
51×
51×
8×
1×
8×
8×
8×
8×
17×
8×
8×
8×
24×
51×
51×
8×
1×
23×
23×
23×
81×
23×
1×
23×
23×
23×
23×
81×
23×
1×
34×
34×
97×
97×
34×
1×
34×
34×
34×
97×
97×
34×
1×
35×
35×
35×
104×
35×
1×
45×
45×
45×
45×
45×
326×
326×
326×
114×
114×
114×
212×
45×
1×
114×
114×
212×
212×
212×
114×
114×
114×
1×
1×
4×
4×
1×
1×
2×
2×
1×
1×
7×
7×
7×
7×
7×
1×
1×
4×
4×
4×
1×
2×
2×
1×
1×
6×
6×
6×
6×
6×
6×
| goog.provide('ol.format.Polyline');
goog.require('goog.asserts');
goog.require('ol.Feature');
goog.require('ol.format.Feature');
goog.require('ol.format.TextFeature');
goog.require('ol.geom.GeometryLayout');
goog.require('ol.geom.LineString');
goog.require('ol.geom.SimpleGeometry');
goog.require('ol.geom.flat.flip');
goog.require('ol.geom.flat.inflate');
goog.require('ol.proj');
/**
* @classdesc
* Feature format for reading and writing data in the Encoded
* Polyline Algorithm Format.
*
* @constructor
* @extends {ol.format.TextFeature}
* @param {olx.format.PolylineOptions=} opt_options
* Optional configuration object.
* @api stable
*/
ol.format.Polyline = function(opt_options) {
var options = opt_options ? opt_options : {};
goog.base(this);
/**
* @inheritDoc
*/
this.defaultDataProjection = ol.proj.get('EPSG:4326');
/**
* @private
* @type {number}
*/
this.factor_ = options.factor ? options.factor : 1e5;
/**
* @private
* @type {ol.geom.GeometryLayout}
*/
this.geometryLayout_ = options.geometryLayout ?
options.geometryLayout : ol.geom.GeometryLayout.XY;
};
goog.inherits(ol.format.Polyline, ol.format.TextFeature);
/**
* Encode a list of n-dimensional points and return an encoded string
*
* Attention: This function will modify the passed array!
*
* @param {Array.<number>} numbers A list of n-dimensional points.
* @param {number} stride The number of dimension of the points in the list.
* @param {number=} opt_factor The factor by which the numbers will be
* multiplied. The remaining decimal places will get rounded away.
* Default is `1e5`.
* @return {string} The encoded string.
* @api
*/
ol.format.Polyline.encodeDeltas = function(numbers, stride, opt_factor) {
var factor = opt_factor ? opt_factor : 1e5;
var d;
var lastNumbers = new Array(stride);
for (d = 0; d < stride; ++d) {
lastNumbers[d] = 0;
}
var i, ii;
for (i = 0, ii = numbers.length; i < ii;) {
for (d = 0; d < stride; ++d, ++i) {
var num = numbers[i];
var delta = num - lastNumbers[d];
lastNumbers[d] = num;
numbers[i] = delta;
}
}
return ol.format.Polyline.encodeFloats(numbers, factor);
};
/**
* Decode a list of n-dimensional points from an encoded string
*
* @param {string} encoded An encoded string.
* @param {number} stride The number of dimension of the points in the
* encoded string.
* @param {number=} opt_factor The factor by which the resulting numbers will
* be divided. Default is `1e5`.
* @return {Array.<number>} A list of n-dimensional points.
* @api
*/
ol.format.Polyline.decodeDeltas = function(encoded, stride, opt_factor) {
var factor = opt_factor ? opt_factor : 1e5;
var d;
/** @type {Array.<number>} */
var lastNumbers = new Array(stride);
for (d = 0; d < stride; ++d) {
lastNumbers[d] = 0;
}
var numbers = ol.format.Polyline.decodeFloats(encoded, factor);
var i, ii;
for (i = 0, ii = numbers.length; i < ii;) {
for (d = 0; d < stride; ++d, ++i) {
lastNumbers[d] += numbers[i];
numbers[i] = lastNumbers[d];
}
}
return numbers;
};
/**
* Encode a list of floating point numbers and return an encoded string
*
* Attention: This function will modify the passed array!
*
* @param {Array.<number>} numbers A list of floating point numbers.
* @param {number=} opt_factor The factor by which the numbers will be
* multiplied. The remaining decimal places will get rounded away.
* Default is `1e5`.
* @return {string} The encoded string.
* @api
*/
ol.format.Polyline.encodeFloats = function(numbers, opt_factor) {
var factor = opt_factor ? opt_factor : 1e5;
var i, ii;
for (i = 0, ii = numbers.length; i < ii; ++i) {
numbers[i] = Math.round(numbers[i] * factor);
}
return ol.format.Polyline.encodeSignedIntegers(numbers);
};
/**
* Decode a list of floating point numbers from an encoded string
*
* @param {string} encoded An encoded string.
* @param {number=} opt_factor The factor by which the result will be divided.
* Default is `1e5`.
* @return {Array.<number>} A list of floating point numbers.
* @api
*/
ol.format.Polyline.decodeFloats = function(encoded, opt_factor) {
var factor = opt_factor ? opt_factor : 1e5;
var numbers = ol.format.Polyline.decodeSignedIntegers(encoded);
var i, ii;
for (i = 0, ii = numbers.length; i < ii; ++i) {
numbers[i] /= factor;
}
return numbers;
};
/**
* Encode a list of signed integers and return an encoded string
*
* Attention: This function will modify the passed array!
*
* @param {Array.<number>} numbers A list of signed integers.
* @return {string} The encoded string.
*/
ol.format.Polyline.encodeSignedIntegers = function(numbers) {
var i, ii;
for (i = 0, ii = numbers.length; i < ii; ++i) {
var num = numbers[i];
numbers[i] = (num < 0) ? ~(num << 1) : (num << 1);
}
return ol.format.Polyline.encodeUnsignedIntegers(numbers);
};
/**
* Decode a list of signed integers from an encoded string
*
* @param {string} encoded An encoded string.
* @return {Array.<number>} A list of signed integers.
*/
ol.format.Polyline.decodeSignedIntegers = function(encoded) {
var numbers = ol.format.Polyline.decodeUnsignedIntegers(encoded);
var i, ii;
for (i = 0, ii = numbers.length; i < ii; ++i) {
var num = numbers[i];
numbers[i] = (num & 1) ? ~(num >> 1) : (num >> 1);
}
return numbers;
};
/**
* Encode a list of unsigned integers and return an encoded string
*
* @param {Array.<number>} numbers A list of unsigned integers.
* @return {string} The encoded string.
*/
ol.format.Polyline.encodeUnsignedIntegers = function(numbers) {
var encoded = '';
var i, ii;
for (i = 0, ii = numbers.length; i < ii; ++i) {
encoded += ol.format.Polyline.encodeUnsignedInteger(numbers[i]);
}
return encoded;
};
/**
* Decode a list of unsigned integers from an encoded string
*
* @param {string} encoded An encoded string.
* @return {Array.<number>} A list of unsigned integers.
*/
ol.format.Polyline.decodeUnsignedIntegers = function(encoded) {
var numbers = [];
var current = 0;
var shift = 0;
var i, ii;
for (i = 0, ii = encoded.length; i < ii; ++i) {
var b = encoded.charCodeAt(i) - 63;
current |= (b & 0x1f) << shift;
if (b < 0x20) {
numbers.push(current);
current = 0;
shift = 0;
} else {
shift += 5;
}
}
return numbers;
};
/**
* Encode one single unsigned integer and return an encoded string
*
* @param {number} num Unsigned integer that should be encoded.
* @return {string} The encoded string.
*/
ol.format.Polyline.encodeUnsignedInteger = function(num) {
var value, encoded = '';
while (num >= 0x20) {
value = (0x20 | (num & 0x1f)) + 63;
encoded += String.fromCharCode(value);
num >>= 5;
}
value = num + 63;
encoded += String.fromCharCode(value);
return encoded;
};
/**
* Read the feature from the Polyline source. The coordinates are assumed to be
* in two dimensions and in latitude, longitude order.
*
* @function
* @param {Document|Node|Object|string} source Source.
* @param {olx.format.ReadOptions=} opt_options Read options.
* @return {ol.Feature} Feature.
* @api stable
*/
ol.format.Polyline.prototype.readFeature;
/**
* @inheritDoc
*/
ol.format.Polyline.prototype.readFeatureFromText = function(text, opt_options) {
var geometry = this.readGeometryFromText(text, opt_options);
return new ol.Feature(geometry);
};
/**
* Read the feature from the source. As Polyline sources contain a single
* feature, this will return the feature in an array.
*
* @function
* @param {Document|Node|Object|string} source Source.
* @param {olx.format.ReadOptions=} opt_options Read options.
* @return {Array.<ol.Feature>} Features.
* @api stable
*/
ol.format.Polyline.prototype.readFeatures;
/**
* @inheritDoc
*/
ol.format.Polyline.prototype.readFeaturesFromText =
function(text, opt_options) {
var feature = this.readFeatureFromText(text, opt_options);
return [feature];
};
/**
* Read the geometry from the source.
*
* @function
* @param {Document|Node|Object|string} source Source.
* @param {olx.format.ReadOptions=} opt_options Read options.
* @return {ol.geom.Geometry} Geometry.
* @api stable
*/
ol.format.Polyline.prototype.readGeometry;
/**
* @inheritDoc
*/
ol.format.Polyline.prototype.readGeometryFromText =
function(text, opt_options) {
var stride = ol.geom.SimpleGeometry.getStrideForLayout(this.geometryLayout_);
var flatCoordinates = ol.format.Polyline.decodeDeltas(
text, stride, this.factor_);
ol.geom.flat.flip.flipXY(
flatCoordinates, 0, flatCoordinates.length, stride, flatCoordinates);
var coordinates = ol.geom.flat.inflate.coordinates(
flatCoordinates, 0, flatCoordinates.length, stride);
return /** @type {ol.geom.Geometry} */ (
ol.format.Feature.transformWithOptions(
new ol.geom.LineString(coordinates, this.geometryLayout_), false,
this.adaptOptions(opt_options)));
};
/**
* Read the projection from a Polyline source.
*
* @function
* @param {Document|Node|Object|string} source Source.
* @return {ol.proj.Projection} Projection.
* @api stable
*/
ol.format.Polyline.prototype.readProjection;
/**
* @inheritDoc
*/
ol.format.Polyline.prototype.writeFeatureText = function(feature, opt_options) {
var geometry = feature.getGeometry();
Eif (geometry) {
return this.writeGeometryText(geometry, opt_options);
} else {
goog.asserts.fail('geometry needs to be defined');
return '';
}
};
/**
* @inheritDoc
*/
ol.format.Polyline.prototype.writeFeaturesText =
function(features, opt_options) {
goog.asserts.assert(features.length == 1,
'features array should have 1 item');
return this.writeFeatureText(features[0], opt_options);
};
/**
* Write a single geometry in Polyline format.
*
* @function
* @param {ol.geom.Geometry} geometry Geometry.
* @param {olx.format.WriteOptions=} opt_options Write options.
* @return {string} Geometry.
* @api stable
*/
ol.format.Polyline.prototype.writeGeometry;
/**
* @inheritDoc
*/
ol.format.Polyline.prototype.writeGeometryText =
function(geometry, opt_options) {
goog.asserts.assertInstanceof(geometry, ol.geom.LineString,
'geometry should be an ol.geom.LineString');
geometry = /** @type {ol.geom.LineString} */
(ol.format.Feature.transformWithOptions(
geometry, true, this.adaptOptions(opt_options)));
var flatCoordinates = geometry.getFlatCoordinates();
var stride = geometry.getStride();
ol.geom.flat.flip.flipXY(
flatCoordinates, 0, flatCoordinates.length, stride, flatCoordinates);
return ol.format.Polyline.encodeDeltas(flatCoordinates, stride, this.factor_);
};
|