/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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/**
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* Provide effect for line
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* @module echarts/chart/helper/EffectLine
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*/
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import Polyline from './Polyline';
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import * as zrUtil from 'zrender/src/core/util';
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import EffectLine from './EffectLine';
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import * as vec2 from 'zrender/src/core/vector';
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/**
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* @constructor
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* @extends {module:echarts/chart/helper/EffectLine}
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* @alias {module:echarts/chart/helper/Polyline}
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*/
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function EffectPolyline(lineData, idx, seriesScope) {
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EffectLine.call(this, lineData, idx, seriesScope);
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this._lastFrame = 0;
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this._lastFramePercent = 0;
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}
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var effectPolylineProto = EffectPolyline.prototype;
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// Overwrite
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effectPolylineProto.createLine = function (lineData, idx, seriesScope) {
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return new Polyline(lineData, idx, seriesScope);
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};
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// Overwrite
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effectPolylineProto.updateAnimationPoints = function (symbol, points) {
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this._points = points;
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var accLenArr = [0];
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var len = 0;
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for (var i = 1; i < points.length; i++) {
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var p1 = points[i - 1];
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var p2 = points[i];
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len += vec2.dist(p1, p2);
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accLenArr.push(len);
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}
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if (len === 0) {
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return;
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}
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for (var i = 0; i < accLenArr.length; i++) {
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accLenArr[i] /= len;
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}
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this._offsets = accLenArr;
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this._length = len;
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};
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// Overwrite
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effectPolylineProto.getLineLength = function (symbol) {
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return this._length;
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};
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// Overwrite
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effectPolylineProto.updateSymbolPosition = function (symbol) {
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var t = symbol.__t;
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var points = this._points;
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var offsets = this._offsets;
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var len = points.length;
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if (!offsets) {
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// Has length 0
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return;
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}
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var lastFrame = this._lastFrame;
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var frame;
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if (t < this._lastFramePercent) {
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// Start from the next frame
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// PENDING start from lastFrame ?
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var start = Math.min(lastFrame + 1, len - 1);
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for (frame = start; frame >= 0; frame--) {
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if (offsets[frame] <= t) {
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break;
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}
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}
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// PENDING really need to do this ?
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frame = Math.min(frame, len - 2);
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}
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else {
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for (var frame = lastFrame; frame < len; frame++) {
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if (offsets[frame] > t) {
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break;
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}
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}
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frame = Math.min(frame - 1, len - 2);
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}
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vec2.lerp(
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symbol.position, points[frame], points[frame + 1],
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(t - offsets[frame]) / (offsets[frame + 1] - offsets[frame])
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);
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var tx = points[frame + 1][0] - points[frame][0];
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var ty = points[frame + 1][1] - points[frame][1];
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symbol.rotation = -Math.atan2(ty, tx) - Math.PI / 2;
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this._lastFrame = frame;
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this._lastFramePercent = t;
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symbol.ignore = false;
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};
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zrUtil.inherits(EffectPolyline, EffectLine);
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export default EffectPolyline;
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