src/chart/line/LineView.js

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// FIXME step not support polar
define(function(require) {

    'use strict';

    var zrUtil = require('zrender/core/util');
    var SymbolDraw = require('../helper/SymbolDraw');
    var Symbol = require('../helper/Symbol');
    var lineAnimationDiff = require('./lineAnimationDiff');
    var graphic = require('../../util/graphic');

    var polyHelper = require('./poly');

    var ChartView = require('../../view/Chart');

    function isPointsSame(points1, points2) {
        if (points1.length !== points2.length) {
            return;
        }
        for (var i = 0; i < points1.length; i++) {
            var p1 = points1[i];
            var p2 = points2[i];
            if (p1[0] !== p2[0] || p1[1] !== p2[1]) {
                return;
            }
        }
        return true;
    }

    function getSmooth(smooth) {
        return typeof (smooth) === 'number' ? smooth : (smooth ? 0.3 : 0);
    }

    function getAxisExtentWithGap(axis) {
        var extent = axis.getGlobalExtent();
        if (axis.onBand) {
            // Remove extra 1px to avoid line miter in clipped edge
            var halfBandWidth = axis.getBandWidth() / 2 - 1;
            var dir = extent[1] > extent[0] ? 1 : -1;
            extent[0] += dir * halfBandWidth;
            extent[1] -= dir * halfBandWidth;
        }
        return extent;
    }

    function sign(val) {
        return val >= 0 ? 1 : -1;
    }
    /**
     * @param {module:echarts/coord/cartesian/Cartesian2D|module:echarts/coord/polar/Polar} coordSys
     * @param {module:echarts/data/List} data
     * @param {Array.<Array.<number>>} points
     * @private
     */
    function getStackedOnPoints(coordSys, data) {
        var baseAxis = coordSys.getBaseAxis();
        var valueAxis = coordSys.getOtherAxis(baseAxis);
        var valueStart = baseAxis.onZero
            ? 0 : valueAxis.scale.getExtent()[0];