selector.js
5.21 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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
/*
* 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.
*/
import * as polygonContain from 'zrender/src/contain/polygon';
import BoundingRect from 'zrender/src/core/BoundingRect';
// Key of the first level is brushType: `line`, `rect`, `polygon`.
// Key of the second level is chart element type: `point`, `rect`.
// See moudule:echarts/component/helper/BrushController
// function param:
// {Object} itemLayout fetch from data.getItemLayout(dataIndex)
// {Object} selectors {point: selector, rect: selector, ...}
// {Object} area {range: [[], [], ..], boudingRect}
// function return:
// {boolean} Whether in the given brush.
var selector = {
lineX: getLineSelectors(0),
lineY: getLineSelectors(1),
rect: {
point: function (itemLayout, selectors, area) {
return itemLayout && area.boundingRect.contain(itemLayout[0], itemLayout[1]);
},
rect: function (itemLayout, selectors, area) {
return itemLayout && area.boundingRect.intersect(itemLayout);
}
},
polygon: {
point: function (itemLayout, selectors, area) {
return itemLayout
&& area.boundingRect.contain(itemLayout[0], itemLayout[1])
&& polygonContain.contain(area.range, itemLayout[0], itemLayout[1]);
},
rect: function (itemLayout, selectors, area) {
var points = area.range;
if (!itemLayout || points.length <= 1) {
return false;
}
var x = itemLayout.x;
var y = itemLayout.y;
var width = itemLayout.width;
var height = itemLayout.height;
var p = points[0];
if (polygonContain.contain(points, x, y)
|| polygonContain.contain(points, x + width, y)
|| polygonContain.contain(points, x, y + height)
|| polygonContain.contain(points, x + width, y + height)
|| BoundingRect.create(itemLayout).contain(p[0], p[1])
|| lineIntersectPolygon(x, y, x + width, y, points)
|| lineIntersectPolygon(x, y, x, y + height, points)
|| lineIntersectPolygon(x + width, y, x + width, y + height, points)
|| lineIntersectPolygon(x, y + height, x + width, y + height, points)
) {
return true;
}
}
}
};
function getLineSelectors(xyIndex) {
var xy = ['x', 'y'];
var wh = ['width', 'height'];
return {
point: function (itemLayout, selectors, area) {
if (itemLayout) {
var range = area.range;
var p = itemLayout[xyIndex];
return inLineRange(p, range);
}
},
rect: function (itemLayout, selectors, area) {
if (itemLayout) {
var range = area.range;
var layoutRange = [
itemLayout[xy[xyIndex]],
itemLayout[xy[xyIndex]] + itemLayout[wh[xyIndex]]
];
layoutRange[1] < layoutRange[0] && layoutRange.reverse();
return inLineRange(layoutRange[0], range)
|| inLineRange(layoutRange[1], range)
|| inLineRange(range[0], layoutRange)
|| inLineRange(range[1], layoutRange);
}
}
};
}
function inLineRange(p, range) {
return range[0] <= p && p <= range[1];
}
function lineIntersectPolygon(lx, ly, l2x, l2y, points) {
for (var i = 0, p2 = points[points.length - 1]; i < points.length; i++) {
var p = points[i];
if (lineIntersect(lx, ly, l2x, l2y, p[0], p[1], p2[0], p2[1])) {
return true;
}
p2 = p;
}
}
// Code from <http://blog.csdn.net/rickliuxiao/article/details/6259322> with some fix.
// See <https://en.wikipedia.org/wiki/Line%E2%80%93line_intersection>
function lineIntersect(a1x, a1y, a2x, a2y, b1x, b1y, b2x, b2y) {
var delta = determinant(a2x - a1x, b1x - b2x, a2y - a1y, b1y - b2y);
if (nearZero(delta)) { // parallel
return false;
}
var namenda = determinant(b1x - a1x, b1x - b2x, b1y - a1y, b1y - b2y) / delta;
if (namenda < 0 || namenda > 1) {
return false;
}
var miu = determinant(a2x - a1x, b1x - a1x, a2y - a1y, b1y - a1y) / delta;
if (miu < 0 || miu > 1) {
return false;
}
return true;
}
function nearZero(val) {
return val <= (1e-6) && val >= -(1e-6);
}
function determinant(v1, v2, v3, v4) {
return v1 * v4 - v2 * v3;
}
export default selector;