zoom.js
4.31 KB
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
/*
* Copyright 2015-present Open Networking Laboratory
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
ONOS GUI -- SVG -- Zoom Service
*/
(function () {
'use strict';
// configuration
var defaultSettings = {
zoomMin: 0.05,
zoomMax: 10,
zoomEnabled: function (ev) { return true; },
zoomCallback: function () {}
};
// injected references to services
var $log;
angular.module('onosSvg')
.factory('ZoomService', ['$log',
function (_$log_) {
$log = _$log_;
/*
NOTE: opts is an object:
{
svg: svg, D3 selection of <svg> element
zoomLayer: zoomLayer, D3 selection of <g> element
zoomEnabled: function (ev) { ... },
zoomCallback: function () { ... }
}
where:
* svg and zoomLayer should be D3 selections of DOM elements.
* zoomLayer <g> is a child of <svg> element.
* zoomEnabled is an optional predicate based on D3 event.
* default is always enabled.
* zoomCallback is an optional callback invoked each time we pan/zoom.
* default is do nothing.
Optionally, zoomMin and zoomMax also can be defined.
These default to 0.25 and 10 respectively.
*/
function createZoomer(opts) {
var cz = 'ZoomService.createZoomer(): ',
d3s = ' (D3 selection) property defined',
settings = angular.extend({}, defaultSettings, opts),
zoom = d3.behavior.zoom()
.translate([0, 0])
.scale(1)
.scaleExtent([settings.zoomMin, settings.zoomMax])
.on('zoom', zoomed),
fail = false,
zoomer;
if (!settings.svg) {
$log.error(cz + 'No "svg" (svg tag)' + d3s);
fail = true;
}
if (!settings.zoomLayer) {
$log.error(cz + 'No "zoomLayer" (g tag)' + d3s);
fail = true;
}
if (fail) {
return null;
}
// zoom events from mouse gestures...
function zoomed() {
var ev = d3.event.sourceEvent;
if (settings.zoomEnabled(ev)) {
adjustZoomLayer(d3.event.translate, d3.event.scale);
}
}
function adjustZoomLayer(translate, scale) {
settings.zoomLayer.attr('transform',
'translate(' + translate + ')scale(' + scale + ')');
settings.zoomCallback();
}
zoomer = {
panZoom: function (translate, scale) {
zoom.translate(translate).scale(scale);
adjustZoomLayer(translate, scale);
},
reset: function () {
zoomer.panZoom([0,0], 1);
},
translate: function () {
return zoom.translate();
},
scale: function () {
return zoom.scale();
},
scaleExtent: function () {
return zoom.scaleExtent();
}
};
// apply the zoom behavior to the SVG element
settings.svg && settings.svg.call(zoom);
return zoomer;
}
return {
createZoomer: createZoomer
};
}]);
}());