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 | 1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
1×
| goog.provide('ol.source.ImageMapGuide');
goog.require('goog.events');
goog.require('goog.events.EventType');
goog.require('goog.object');
goog.require('goog.uri.utils');
goog.require('ol.Image');
goog.require('ol.ImageLoadFunctionType');
goog.require('ol.ImageUrlFunction');
goog.require('ol.extent');
goog.require('ol.source.Image');
/**
* @classdesc
* Source for images from Mapguide servers
*
* @constructor
* @fires ol.source.ImageEvent
* @extends {ol.source.Image}
* @param {olx.source.ImageMapGuideOptions} options Options.
* @api stable
*/
ol.source.ImageMapGuide = function(options) {
goog.base(this, {
projection: options.projection,
resolutions: options.resolutions
});
/**
* @private
* @type {?string}
*/
this.crossOrigin_ =
options.crossOrigin !== undefined ? options.crossOrigin : null;
/**
* @private
* @type {number}
*/
this.displayDpi_ = options.displayDpi !== undefined ?
options.displayDpi : 96;
/**
* @private
* @type {Object}
*/
this.params_ = options.params !== undefined ? options.params : {};
var imageUrlFunction;
if (options.url !== undefined) {
imageUrlFunction = ol.ImageUrlFunction.createFromParamsFunction(
options.url, this.params_, goog.bind(this.getUrl, this));
} else {
imageUrlFunction = ol.ImageUrlFunction.nullImageUrlFunction;
}
/**
* @private
* @type {ol.ImageUrlFunctionType}
*/
this.imageUrlFunction_ = imageUrlFunction;
/**
* @private
* @type {ol.ImageLoadFunctionType}
*/
this.imageLoadFunction_ = options.imageLoadFunction !== undefined ?
options.imageLoadFunction : ol.source.Image.defaultImageLoadFunction;
/**
* @private
* @type {boolean}
*/
this.hidpi_ = options.hidpi !== undefined ? options.hidpi : true;
/**
* @private
* @type {number}
*/
this.metersPerUnit_ = options.metersPerUnit !== undefined ?
options.metersPerUnit : 1;
/**
* @private
* @type {number}
*/
this.ratio_ = options.ratio !== undefined ? options.ratio : 1;
/**
* @private
* @type {boolean}
*/
this.useOverlay_ = options.useOverlay !== undefined ?
options.useOverlay : false;
/**
* @private
* @type {ol.Image}
*/
this.image_ = null;
/**
* @private
* @type {number}
*/
this.renderedRevision_ = 0;
};
goog.inherits(ol.source.ImageMapGuide, ol.source.Image);
/**
* Get the user-provided params, i.e. those passed to the constructor through
* the "params" option, and possibly updated using the updateParams method.
* @return {Object} Params.
* @api stable
*/
ol.source.ImageMapGuide.prototype.getParams = function() {
return this.params_;
};
/**
* @inheritDoc
*/
ol.source.ImageMapGuide.prototype.getImageInternal =
function(extent, resolution, pixelRatio, projection) {
resolution = this.findNearestResolution(resolution);
pixelRatio = this.hidpi_ ? pixelRatio : 1;
var image = this.image_;
if (image &&
this.renderedRevision_ == this.getRevision() &&
image.getResolution() == resolution &&
image.getPixelRatio() == pixelRatio &&
ol.extent.containsExtent(image.getExtent(), extent)) {
return image;
}
if (this.ratio_ != 1) {
extent = extent.slice();
ol.extent.scaleFromCenter(extent, this.ratio_);
}
var width = ol.extent.getWidth(extent) / resolution;
var height = ol.extent.getHeight(extent) / resolution;
var size = [width * pixelRatio, height * pixelRatio];
var imageUrl = this.imageUrlFunction_(extent, size, projection);
if (imageUrl !== undefined) {
image = new ol.Image(extent, [resolution, resolution], pixelRatio,
this.getAttributions(), imageUrl, this.crossOrigin_,
this.imageLoadFunction_);
goog.events.listen(image, goog.events.EventType.CHANGE,
this.handleImageChange, false, this);
} else {
image = null;
}
this.image_ = image;
this.renderedRevision_ = this.getRevision();
return image;
};
/**
* Return the image load function of the source.
* @return {ol.ImageLoadFunctionType} The image load function.
* @api
*/
ol.source.ImageMapGuide.prototype.getImageLoadFunction = function() {
return this.imageLoadFunction_;
};
/**
* @param {ol.Extent} extent The map extents.
* @param {ol.Size} size The viewport size.
* @param {number} metersPerUnit The meters-per-unit value.
* @param {number} dpi The display resolution.
* @return {number} The computed map scale.
*/
ol.source.ImageMapGuide.getScale = function(extent, size, metersPerUnit, dpi) {
var mcsW = ol.extent.getWidth(extent);
var mcsH = ol.extent.getHeight(extent);
var devW = size[0];
var devH = size[1];
var mpp = 0.0254 / dpi;
if (devH * mcsW > devW * mcsH) {
return mcsW * metersPerUnit / (devW * mpp); // width limited
} else {
return mcsH * metersPerUnit / (devH * mpp); // height limited
}
};
/**
* Update the user-provided params.
* @param {Object} params Params.
* @api stable
*/
ol.source.ImageMapGuide.prototype.updateParams = function(params) {
goog.object.extend(this.params_, params);
this.changed();
};
/**
* @param {string} baseUrl The mapagent url.
* @param {Object.<string, string|number>} params Request parameters.
* @param {ol.Extent} extent Extent.
* @param {ol.Size} size Size.
* @param {ol.proj.Projection} projection Projection.
* @return {string} The mapagent map image request URL.
*/
ol.source.ImageMapGuide.prototype.getUrl =
function(baseUrl, params, extent, size, projection) {
var scale = ol.source.ImageMapGuide.getScale(extent, size,
this.metersPerUnit_, this.displayDpi_);
var center = ol.extent.getCenter(extent);
var baseParams = {
'OPERATION': this.useOverlay_ ? 'GETDYNAMICMAPOVERLAYIMAGE' : 'GETMAPIMAGE',
'VERSION': '2.0.0',
'LOCALE': 'en',
'CLIENTAGENT': 'ol.source.ImageMapGuide source',
'CLIP': '1',
'SETDISPLAYDPI': this.displayDpi_,
'SETDISPLAYWIDTH': Math.round(size[0]),
'SETDISPLAYHEIGHT': Math.round(size[1]),
'SETVIEWSCALE': scale,
'SETVIEWCENTERX': center[0],
'SETVIEWCENTERY': center[1]
};
goog.object.extend(baseParams, params);
return goog.uri.utils.appendParamsFromMap(baseUrl, baseParams);
};
/**
* Set the image load function of the MapGuide source.
* @param {ol.ImageLoadFunctionType} imageLoadFunction Image load function.
* @api
*/
ol.source.ImageMapGuide.prototype.setImageLoadFunction = function(
imageLoadFunction) {
this.image_ = null;
this.imageLoadFunction_ = imageLoadFunction;
this.changed();
};
|