EffectPolyline.js
3.31 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
var Polyline = require("./Polyline");
var zrUtil = require("zrender/lib/core/util");
var EffectLine = require("./EffectLine");
var vec2 = require("zrender/lib/core/vector");
/*
* 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.
*/
/**
* Provide effect for line
* @module echarts/chart/helper/EffectLine
*/
/**
* @constructor
* @extends {module:echarts/chart/helper/EffectLine}
* @alias {module:echarts/chart/helper/Polyline}
*/
function EffectPolyline(lineData, idx, seriesScope) {
EffectLine.call(this, lineData, idx, seriesScope);
this._lastFrame = 0;
this._lastFramePercent = 0;
}
var effectPolylineProto = EffectPolyline.prototype; // Overwrite
effectPolylineProto.createLine = function (lineData, idx, seriesScope) {
return new Polyline(lineData, idx, seriesScope);
}; // Overwrite
effectPolylineProto.updateAnimationPoints = function (symbol, points) {
this._points = points;
var accLenArr = [0];
var len = 0;
for (var i = 1; i < points.length; i++) {
var p1 = points[i - 1];
var p2 = points[i];
len += vec2.dist(p1, p2);
accLenArr.push(len);
}
if (len === 0) {
return;
}
for (var i = 0; i < accLenArr.length; i++) {
accLenArr[i] /= len;
}
this._offsets = accLenArr;
this._length = len;
}; // Overwrite
effectPolylineProto.getLineLength = function (symbol) {
return this._length;
}; // Overwrite
effectPolylineProto.updateSymbolPosition = function (symbol) {
var t = symbol.__t;
var points = this._points;
var offsets = this._offsets;
var len = points.length;
if (!offsets) {
// Has length 0
return;
}
var lastFrame = this._lastFrame;
var frame;
if (t < this._lastFramePercent) {
// Start from the next frame
// PENDING start from lastFrame ?
var start = Math.min(lastFrame + 1, len - 1);
for (frame = start; frame >= 0; frame--) {
if (offsets[frame] <= t) {
break;
}
} // PENDING really need to do this ?
frame = Math.min(frame, len - 2);
} else {
for (var frame = lastFrame; frame < len; frame++) {
if (offsets[frame] > t) {
break;
}
}
frame = Math.min(frame - 1, len - 2);
}
vec2.lerp(symbol.position, points[frame], points[frame + 1], (t - offsets[frame]) / (offsets[frame + 1] - offsets[frame]));
var tx = points[frame + 1][0] - points[frame][0];
var ty = points[frame + 1][1] - points[frame][1];
symbol.rotation = -Math.atan2(ty, tx) - Math.PI / 2;
this._lastFrame = frame;
this._lastFramePercent = t;
symbol.ignore = false;
};
zrUtil.inherits(EffectPolyline, EffectLine);
var _default = EffectPolyline;
module.exports = _default;