src/chart/line/lineAnimationDiff.js

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define(function (require) {

    // var arrayDiff = require('zrender/core/arrayDiff');
    // 'zrender/core/arrayDiff' has been used before, but it did
    // not do well in performance when roam with fixed dataZoom window.

    function sign(val) {
        return val >= 0 ? 1 : -1;
    }

    function getStackedOnPoint(coordSys, data, idx) {
        var baseAxis = coordSys.getBaseAxis();
        var valueAxis = coordSys.getOtherAxis(baseAxis);
        var valueStart = baseAxis.onZero
            ? 0 : valueAxis.scale.getExtent()[0];

        var valueDim = valueAxis.dim;
        var baseDataOffset = valueDim === 'x' || valueDim === 'radius' ? 1 : 0;

        var stackedOnSameSign;
        var stackedOn = data.stackedOn;
        var val = data.get(valueDim, idx);
        // Find first stacked value with same sign
        while (stackedOn &&
            sign(stackedOn.get(valueDim, idx)) === sign(val)
        ) {
            stackedOnSameSign = stackedOn;
            break;
        }
        var stackedData = [];
        stackedData[baseDataOffset] = data.get(baseAxis.dim, idx);
        stackedData[1 - baseDataOffset] = stackedOnSameSign
            ? stackedOnSameSign.get(valueDim, idx, true) : valueStart;

        return coordSys.dataToPoint(stackedData);
    }

    // function convertToIntId(newIdList, oldIdList) {
    //     // Generate int id instead of string id.
    //     // Compare string maybe slow in score function of arrDiff

    //     // Assume id in idList are all unique
    //     var idIndicesMap = {};
    //     var idx = 0;
    //     for (var i = 0; i < newIdList.length; i++) {
    //         idIndicesMap[newIdList[i]] = idx;
    //         newIdList[i] = idx++;
    //     }
    //     for (var i = 0; i < oldIdList.length; i++) {
    //         var oldId = oldIdList[i];
    //         // Same with newIdList
    //         if (idIndicesMap[oldId]) {
    //             oldIdList[i] = idIndicesMap[oldId];
    //         }
    //         else {
    //             oldIdList[i] = idx++;
    //         }
    //     }
    // }