roamHelper.js
2.04 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
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
/**
* @param {module:echarts/coord/View} view
* @param {Object} payload
* @param {Object} [zoomLimit]
*/
function updateCenterAndZoom(view, payload, zoomLimit) {
var previousZoom = view.getZoom();
var center = view.getCenter();
var zoom = payload.zoom;
var point = view.dataToPoint(center);
if (payload.dx != null && payload.dy != null) {
point[0] -= payload.dx;
point[1] -= payload.dy;
var center = view.pointToData(point);
view.setCenter(center);
}
if (zoom != null) {
if (zoomLimit) {
var zoomMin = zoomLimit.min || 0;
var zoomMax = zoomLimit.max || Infinity;
zoom = Math.max(Math.min(previousZoom * zoom, zoomMax), zoomMin) / previousZoom;
} // Zoom on given point(originX, originY)
view.scale[0] *= zoom;
view.scale[1] *= zoom;
var position = view.position;
var fixX = (payload.originX - position[0]) * (zoom - 1);
var fixY = (payload.originY - position[1]) * (zoom - 1);
position[0] -= fixX;
position[1] -= fixY;
view.updateTransform(); // Get the new center
var center = view.pointToData(point);
view.setCenter(center);
view.setZoom(zoom * previousZoom);
}
return {
center: view.getCenter(),
zoom: view.getZoom()
};
}
exports.updateCenterAndZoom = updateCenterAndZoom;