src/chart/heatmap/HeatmapView.js

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define(function (require) {

    var graphic = require('../../util/graphic');
    var HeatmapLayer = require('./HeatmapLayer');
    var zrUtil = require('zrender/core/util');

    function getIsInPiecewiseRange(dataExtent, pieceList, selected) {
        var dataSpan = dataExtent[1] - dataExtent[0];
        pieceList = zrUtil.map(pieceList, function (piece) {
            return {
                interval: [
                    (piece.interval[0] - dataExtent[0]) / dataSpan,
                    (piece.interval[1] - dataExtent[0]) / dataSpan
                ]
            };
        });
        var len = pieceList.length;
        var lastIndex = 0;
        return function (val) {
            // Try to find in the location of the last found
            for (var i = lastIndex; i < len; i++) {
                var interval = pieceList[i].interval;
                if (interval[0] <= val && val <= interval[1]) {
                    lastIndex = i;
                    break;
                }
            }
            if (i === len) { // Not found, back interation
                for (var i = lastIndex - 1; i >= 0; i--) {
                    var interval = pieceList[i].interval;
                    if (interval[0] <= val && val <= interval[1]) {
                        lastIndex = i;
                        break;
                    }
                }
            }
            return i >= 0 && i < len && selected[i];
        };
    }

    function getIsInContinuousRange(dataExtent, range) {
        var dataSpan = dataExtent[1] - dataExtent[0];
        range = [
            (range[0] - dataExtent[0]) / dataSpan,
            (range[1] - dataExtent[0]) / dataSpan
        ];
        return function (val) {
            return val >= range[0] && val <= range[1];
        };
    }

    function isGeoCoordSys(coordSys) {
        var dimensions = coordSys.dimensions;
        // Not use coorSys.type === 'geo' because coordSys maybe extended
        return dimensions[0] === 'lng' && dimensions[1] === 'lat';
    }

    return require('../../echarts').extendChartView({

        type: 'heatmap',