EffectPolyline.js
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/*
* 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
*/
import Polyline from './Polyline';
import * as zrUtil from 'zrender/src/core/util';
import EffectLine from './EffectLine';
import * as vec2 from 'zrender/src/core/vector';
/**
* @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);
export default EffectPolyline;