格網統計圖是一種將統計資料彙總到格網當中顯示的統計圖表，它的使用範圍相當廣泛。可以使用一點的監測值代表一個網格區域的值。可以不用使用插值而得到整個面的統計值。

eCharts本身並不提供格網統計圖的實現，但eCharts提供的使用者自定義表可以幫助我們實現。

格網統計圖：

1、引入相關js引用

       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts/echarts.min.js"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts-gl/echarts-gl.min.js"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts-stat/ecStat.min.js"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts/extension/dataTool.min.js"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts/map/js/china.js"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts/map/js/world.js"></script>
       <script type="text/javascript" src="https://api.map.baidu.com/api?v=2.0&ak=ZUONbpqGBsYGXNIYHicvbAbM"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts/extension/bmap.min.js"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/simplex.js"></script>
 

2、定義標籤及其樣式

            <div id="MapDiv"></div>

3、初始化圖表

var dom = document.getElementById("MapDiv");
var myChart = echarts.init(dom);

4、定義網格顏色、範圍、行列數

var COLORS = ["green", "blue", "yellow", "orange", "red", "brown"];
var lngExtent = [38.5, 40.3];
var latExtent = [116.7, 119];
var cellCount = [112, 182];
 

5、定義網格渲染方式

var cellSizeCoord = [
    (lngExtent[1] - lngExtent[0]) / cellCount[0],
    (latExtent[1] - latExtent[0]) / cellCount[1]
];
var gapSize = 0;

function renderItem(params, api) {
    var context = params.context;
    var lngIndex = api.value(0);
    var latIndex = api.value(1);
    var coordLeftTop = [
        +(latExtent[0] + lngIndex * cellSizeCoord[0]).toFixed(6),
        +(lngExtent[0] + latIndex * cellSizeCoord[1]).toFixed(6)
    ];
    var pointLeftTop = getCoord(params, api, lngIndex, latIndex);
    var pointRightBottom = getCoord(params, api, lngIndex + 1, latIndex + 1);

    return {
        type: 'rect',
        shape: {
            x: pointLeftTop[0],
            y: pointLeftTop[1],
            width: pointRightBottom[0] - pointLeftTop[0],
            height: pointRightBottom[1] - pointLeftTop[1]
        },
        style: api.style({
            stroke: 'rgba(0,0,0,0.1)'
        }),
        styleEmphasis: api.styleEmphasis()
    };
}

function getCoord(params, api, lngIndex, latIndex) {
    var coords = params.context.coords || (params.context.coords = []);
    var key = lngIndex + '-' + latIndex;

    // bmap returns point in integer, which makes cell width unstable.
    // So we have to use right bottom point.
    return coords[key] || (coords[key] = api.coord([
        +(latExtent[0] + lngIndex * cellSizeCoord[0]).toFixed(6),
        +(lngExtent[0] + latIndex * cellSizeCoord[1]).toFixed(6)
    ]));
}
 

6、設定引數Option

option = {
    tooltip: {},
    visualMap: {
        type: 'piecewise',
        inverse: true,
        top: 10,
        left: 10,
        pieces: [{
            value: 0, color: COLORS[0]
        }, {
            value: 1, color: COLORS[1]
        }, {
            value: 2, color: COLORS[2]
        }, {
            value: 3, color: COLORS[3]
        }, {
            value: 4, color: COLORS[4]
        }, {
            value: 5, color: COLORS[5]
        }],
        borderColor: '#ccc',
        borderWidth: 2,
        backgroundColor: '#eee',
        dimension: 2,
        inRange: {
            color: COLORS,
            opacity: 0.5
        }
    },
    series: [
        {
            type: 'custom',
            coordinateSystem: 'bmap',
            renderItem: renderItem,
            animation: false,
            itemStyle: {
                emphasis: {
                    color: 'yellow'
                }
            },
            encode: {
                tooltip: 2
            },
            data: values
        }
    ],
    bmap: {
        center: [117.4, 39.3],
        zoom: 11.8,
        roam: true,
        mapStyle: {
            styleJson: [{
                'featureType': 'water',
                'elementType': 'all',
                'stylers': {
                    'color': '#d1d1d1'
                }
            }, {
                'featureType': 'land',
                'elementType': 'all',
                'stylers': {
                    'color': '#f3f3f3'
                }
            }, {
                'featureType': 'railway',
                'elementType': 'all',
                'stylers': {
                    'visibility': 'off'
                }
            }, {
                'featureType': 'highway',
                'elementType': 'all',
                'stylers': {
                    'color': '#999999'
                }
            }, {
                'featureType': 'highway',
                'elementType': 'labels',
                'stylers': {
                    'visibility': 'off'
                }
            }, {
                'featureType': 'arterial',
                'elementType': 'geometry',
                'stylers': {
                    'color': '#fefefe'
                }
            }, {
                'featureType': 'arterial',
                'elementType': 'geometry.fill',
                'stylers': {
                    'color': '#fefefe'
                }
            }, {
                'featureType': 'poi',
                'elementType': 'all',
                'stylers': {
                    'visibility': 'off'
                }
            }, {
                'featureType': 'green',
                'elementType': 'all',
                'stylers': {
                    'visibility': 'off'
                }
            }, {
                'featureType': 'subway',
                'elementType': 'all',
                'stylers': {
                    'visibility': 'off'
                }
            }, {
                'featureType': 'manmade',
                'elementType': 'all',
                'stylers': {
                    'color': '#d1d1d1'
                }
            }, {
                'featureType': 'local',
                'elementType': 'all',
                'stylers': {
                    'color': '#d1d1d1'
                }
            }, {
                'featureType': 'arterial',
                'elementType': 'labels',
                'stylers': {
                    'visibility': 'off'
                }
            }, {
                'featureType': 'boundary',
                'elementType': 'all',
                'stylers': {
                    'color': '#fefefe'
                }
            }, {
                'featureType': 'building',
                'elementType': 'all',
                'stylers': {
                    'color': '#d1d1d1'
                }
            }, {
                'featureType': 'label',
                'elementType': 'labels.text.fill',
                'stylers': {
                    'color': 'rgba(0,0,0,0)'
                }
            }]
        }
    }
};;

PS、資料樣式

所有資料構成一個數組，如：

[[0,0,1],[1,0,3]]

其中每個格網的值又是一個數組，第一個數位列，第二個數為行，第三個數為值

即[col,row,val]

全部程式碼：

<!DOCTYPE html>
<html style="height: 100%">
   <head>
       <meta charset="utf-8">
   </head>
   <body style="height: 100%; margin: 0">
       <div id="container" style="height: 100%"></div>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts/echarts.min.js"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts-gl/echarts-gl.min.js"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts-stat/ecStat.min.js"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts/extension/dataTool.min.js"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts/map/js/china.js"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts/map/js/world.js"></script>
       <script type="text/javascript" src="https://api.map.baidu.com/api?v=2.0&ak=ZUONbpqGBsYGXNIYHicvbAbM"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/echarts/extension/bmap.min.js"></script>
       <script type="text/javascript" src="http://echarts.baidu.com/gallery/vendors/simplex.js"></script>
       <script type="text/javascript">
var dom = document.getElementById("container");
var myChart = echarts.init(dom);
var app = {};
option = null;
var COLORS = ["#070093", "#1c3fbf", "#1482e5", "#70b4eb", "#b4e0f3", "#ffffff"];
var lngExtent = [39.5, 40.6];
var latExtent = [115.9, 116.8];
var cellCount = [50, 50];
var cellSizeCoord = [
    (lngExtent[1] - lngExtent[0]) / cellCount[0],
    (latExtent[1] - latExtent[0]) / cellCount[1]
];
var gapSize = 0;
var data = 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,[42,41,5],[43,41,5],[44,41,5],[45,41,5],[46,41,5],[47,41,5],[48,41,5],[49,41,5],[0,42,5],[1,42,5],[2,42,5],[3,42,5],[4,42,5],[5,42,5],[6,42,5],[7,42,5],[8,42,5],[9,42,5],[10,42,5],[11,42,4],[12,42,4],[13,42,5],[14,42,5],[15,42,4],[16,42,4],[17,42,5],[18,42,5],[19,42,5],[20,42,5],[21,42,5],[22,42,5],[23,42,5],[24,42,5],[25,42,5],[26,42,5],[27,42,5],[28,42,5],[29,42,2],[30,42,5],[31,42,5],[32,42,5],[33,42,5],[34,42,5],[35,42,5],[36,42,5],[37,42,5],[38,42,5],[39,42,5],[40,42,5],[41,42,5],[42,42,5],[43,42,5],[44,42,5],[45,42,5],[46,42,5],[47,42,5],[48,42,5],[49,42,5],[0,43,5],[1,43,5],[2,43,5],[3,43,5],[4,43,5],[5,43,5],[6,43,5],[7,43,5],[8,43,5],[9,43,5],[10,43,5],[11,43,5],[12,43,5],[13,43,2],[14,43,5],[15,43,5],[16,43,5],[17,43,5],[18,43,5],[19,43,5],[20,43,5],[21,43,5],[22,43,5],[23,43,5],[24,43,5],[25,43,5],[26,43,5],[27,43,5],[28,43,5],[29,43,5],[30,43,4],[31,43,4],[32,43,4],[33,43,4],[34,43,5],[35,43,5],[36,43,5],[37,43,5],[38,43,4],[39,43,4],[40,43,4],[41,43,5],[42,43,5],[43,43,5],[44,43,5],[45,43,5],[46,43,5],[47,43,5],[48,43,5],[49,43,5],[0,44,5],[1,44,5],[2,44,5],[3,44,5],[4,44,5],[5,44,5],[6,44,5],[7,44,5],[8,44,5],[9,44,5],[10,44,5],[11,44,5],[12,44,5],[13,44,2],[14,44,5],[15,44,5],[16,44,5],[17,44,5],[18,44,5],[19,44,5],[20,44,4],[21,44,5],[22,44,5],[23,44,5],[24,44,5],[25,44,5],[26,44,5],[27,44,5],[28,44,5],[29,44,5],[30,44,2],[31,44,4],[32,44,2],[33,44,2],[34,44,2],[35,44,4],[36,44,4],[37,44,5],[38,44,5],[39,44,4],[40,44,5],[41,44,4],[42,44,5],[43,44,5],[44,44,5],[45,44,5],[46,44,5],[47,44,5],[48,44,5],[49,44,5],[0,45,5],[1,45,5],[2,45,5],[3,45,5],[4,45,5],[5,45,5],[6,45,5],[7,45,5],[8,45,5],[9,45,5],[10,45,5],[11,45,5],[12,45,5],[13,45,5],[14,45,5],[15,45,5],[16,45,5],[17,45,5],[18,45,5],[19,45,4],[20,45,5],[21,45,5],[22,45,5],[23,45,5],[24,45,5],[25,45,5],[26,45,5],[27,45,5],[28,45,5],[29,45,5],[30,45,4],[31,45,2],[32,45,2],[33,45,2],[34,45,2],[35,45,4],[36,45,4],[37,45,4],[38,45,4],[39,45,4],[40,45,5],[41,45,4],[42,45,4],[43,45,5],[44,45,5],[45,45,5],[46,45,5],[47,45,5],[48,45,5],[49,45,5],[0,46,5],[1,46,5],[2,46,5],[3,46,5],[4,46,5],[5,46,5],[6,46,5],[7,46,5],[8,46,5],[9,46,5],[10,46,5],[11,46,5],[12,46,5],[13,46,5],[14,46,5],[15,46,5],[16,46,5],[17,46,5],[18,46,5],[19,46,5],[20,46,5],[21,46,5],[22,46,5],[23,46,5],[24,46,5],[25,46,5],[26,46,5],[27,46,5],[28,46,5],[29,46,4],[30,46,4],[31,46,4],[32,46,4],[33,46,2],[34,46,2],[35,46,4],[36,46,2],[37,46,4],[38,46,5],[39,46,4],[40,46,5],[41,46,5],[42,46,5],[43,46,5],[44,46,5],[45,46,5],[46,46,5],[47,46,5],[48,46,5],[49,46,5],[0,47,5],[1,47,5],[2,47,5],[3,47,5],[4,47,5],[5,47,5],[6,47,5],[7,47,5],[8,47,5],[9,47,5],[10,47,5],[11,47,5],[12,47,5],[13,47,5],[14,47,5],[15,47,5],[16,47,5],[17,47,5],[18,47,5],[19,47,5],[20,47,5],[21,47,5],[22,47,5],[23,47,5],[24,47,5],[25,47,5],[26,47,5],[27,47,5],[28,47,5],[29,47,5],[30,47,5],[31,47,5],[32,47,4],[33,47,5],[34,47,4],[35,47,5],[36,47,5],[37,47,5],[38,47,5],[39,47,5],[40,47,4],[41,47,4],[42,47,5],[43,47,5],[44,47,5],[45,47,5],[46,47,5],[47,47,5],[48,47,5],[49,47,5],[0,48,5],[1,48,5],[2,48,5],[3,48,5],[4,48,5],[5,48,5],[6,48,5],[7,48,5],[8,48,5],[9,48,5],[10,48,5],[11,48,5],[12,48,5],[13,48,4],[14,48,5],[15,48,4],[16,48,5],[17,48,5],[18,48,5],[19,48,5],[20,48,5],[21,48,5],[22,48,5],[23,48,5],[24,48,5],[25,48,5],[26,48,5],[27,48,5],[28,48,5],[29,48,5],[30,48,5],[31,48,5],[32,48,5],[33,48,5],[34,48,5],[35,48,5],[36,48,5],[37,48,5],[38,48,5],[39,48,5],[40,48,5],[41,48,4],[42,48,4],[43,48,5],[44,48,5],[45,48,5],[46,48,5],[47,48,5],[48,48,5],[49,48,5],[0,49,5],[1,49,5],[2,49,5],[3,49,5],[4,49,5],[5,49,5],[6,49,5],[7,49,5],[8,49,5],[9,49,5],[10,49,5],[11,49,5],[12,49,5],[13,49,5],[14,49,5],[15,49,5],[16,49,5],[17,49,5],[18,49,5],[19,49,5],[20,49,5],[21,49,5],[22,49,5],[23,49,5],[24,49,5],[25,49,5],[26,49,5],[27,49,5],[28,49,5],[29,49,5],[30,49,5],[31,49,5],[32,49,5],[33,49,5],[34,49,5],[35,49,5],[36,49,5],[37,49,5],[38,49,5],[39,49,5],[40,49,5],[41,49,4],[42,49,5],[43,49,5],[44,49,5],[45,49,5],[46,49,5],[47,49,5],[48,49,5],[49,49,5]];

function renderItem(params, api) {
    var context = params.context;
    var lngIndex = api.value(0);
    var latIndex = api.value(1);
    var coordLeftTop = [
        +(latExtent[0] + lngIndex * cellSizeCoord[0]).toFixed(6),
        +(lngExtent[0] + latIndex * cellSizeCoord[1]).toFixed(6)
    ];
    var pointLeftTop = getCoord(params, api, lngIndex, latIndex);
    var pointRightBottom = getCoord(params, api, lngIndex + 1, latIndex + 1);

    return {
        type: 'rect',
        shape: {
            x: pointLeftTop[0],
            y: pointLeftTop[1],
            width: pointRightBottom[0] - pointLeftTop[0],
            height: pointRightBottom[1] - pointLeftTop[1]
        },
        style: api.style({
            stroke: 'rgba(0,0,0,0.1)'
        }),
        styleEmphasis: api.styleEmphasis()
    };
}

function getCoord(params, api, lngIndex, latIndex) {
    var coords = params.context.coords || (params.context.coords = []);
    var key = lngIndex + '-' + latIndex;

    // bmap returns point in integer, which makes cell width unstable.
    // So we have to use right bottom point.
    return coords[key] || (coords[key] = api.coord([
        +(latExtent[0] + lngIndex * cellSizeCoord[0]).toFixed(6),
        +(lngExtent[0] + latIndex * cellSizeCoord[1]).toFixed(6)
    ]));
}

option = {
    tooltip: {},
    visualMap: {
        type: 'piecewise',
        inverse: true,
        top: 10,
        left: 10,
        pieces: [{
            value: 0, color: COLORS[0]
        }, {
            value: 1, color: COLORS[1]
        }, {
            value: 2, color: COLORS[2]
        }, {
            value: 3, color: COLORS[3]
        }, {
            value: 4, color: COLORS[4]
        }, {
            value: 5, color: COLORS[5]
        }],
        borderColor: '#ccc',
        borderWidth: 2,
        backgroundColor: '#eee',
        dimension: 2,
        inRange: {
            color: COLORS,
            opacity: 0.7
        }
    },
    series: [
        {
            type: 'custom',
            coordinateSystem: 'bmap',
            renderItem: renderItem,
            animation: false,
            itemStyle: {
                emphasis: {
                    color: 'yellow'
                }
            },
            encode: {
                tooltip: 2
            },
            data: data
        }
    ],
    bmap: {
        center: [116.46, 39.92],
        zoom: 11.8,
        roam: true,
        mapStyle: {
            styleJson: [{
                'featureType': 'water',
                'elementType': 'all',
                'stylers': {
                    'color': '#d1d1d1'
                }
            }, {
                'featureType': 'land',
                'elementType': 'all',
                'stylers': {
                    'color': '#f3f3f3'
                }
            }, {
                'featureType': 'railway',
                'elementType': 'all',
                'stylers': {
                    'visibility': 'off'
                }
            }, {
                'featureType': 'highway',
                'elementType': 'all',
                'stylers': {
                    'color': '#999999'
                }
            }, {
                'featureType': 'highway',
                'elementType': 'labels',
                'stylers': {
                    'visibility': 'off'
                }
            }, {
                'featureType': 'arterial',
                'elementType': 'geometry',
                'stylers': {
                    'color': '#fefefe'
                }
            }, {
                'featureType': 'arterial',
                'elementType': 'geometry.fill',
                'stylers': {
                    'color': '#fefefe'
                }
            }, {
                'featureType': 'poi',
                'elementType': 'all',
                'stylers': {
                    'visibility': 'off'
                }
            }, {
                'featureType': 'green',
                'elementType': 'all',
                'stylers': {
                    'visibility': 'off'
                }
            }, {
                'featureType': 'subway',
                'elementType': 'all',
                'stylers': {
                    'visibility': 'off'
                }
            }, {
                'featureType': 'manmade',
                'elementType': 'all',
                'stylers': {
                    'color': '#d1d1d1'
                }
            }, {
                'featureType': 'local',
                'elementType': 'all',
                'stylers': {
                    'color': '#d1d1d1'
                }
            }, {
                'featureType': 'arterial',
                'elementType': 'labels',
                'stylers': {
                    'visibility': 'off'
                }
            }, {
                'featureType': 'boundary',
                'elementType': 'all',
                'stylers': {
                    'color': '#fefefe'
                }
            }, {
                'featureType': 'building',
                'elementType': 'all',
                'stylers': {
                    'color': '#d1d1d1'
                }
            }, {
                'featureType': 'label',
                'elementType': 'labels.text.fill',
                'stylers': {
                    'color': 'rgba(0,0,0,0)'
                }
            }]
        }
    }
};;
if (option && typeof option === "object") {
    myChart.setOption(option, true);
}
       </script>
   </body>
</html>