Echarts使用心得------3D地图渲染

最近开始写前端了，好多东西都在摸索，比之前要忙了，但是笔记还是要记的，趁难得闲下来，总结总结最近的一些新东西。

用Echarts做三维地图，需要有GeoJson数据，且对数据是有要求的，

 想要绘出地图，它其中properties的属性中必须要有name字段，我一开始shp里面的字段名叫NAME，是大写的，导出为geojson后就读不出来了，改为小写就好了，巨坑。

另：坐标系要4326的

第一步：获取数据：

    function analyseJSON(_url, _callback) {
        let url = _url;
        let request = new XMLHttpRequest();
        request.open("get", url);
        request.send(null);
        request.onload = function () {            if (request.status == 200) {/*返回状态为200，即为数据获取成功*/
                var json = request.responseText;
                _callback(json);
            }
        }
    }

第二步：注册地图

  echarts.registerMap("绍兴", getJSON);

第三部：构造三维地图

    // 引入JSON文件
    analyseJSON('./绍兴区县.json', function (getJSON) {        var myChart = echarts.init(document.getElementById('main'));
        echarts.registerMap("绍兴", getJSON);
        let inputData = [565464, 117230.34, 74130.95, 41375.41, 43099.39, 127574.2, 86198.78, 75854.93];
        let data2 = [                // 可对单个地图区域进行设置            {
                name: '越城区',
                value: inputData[2],
                itemStyle: {                // 单个区域的样式设置
                    color: '#e78078',
                },
            },
            {
                name: '上虞区',
                value: inputData[4],
                itemStyle: {                // 单个区域的样式设置
                    color: '#98a3af',
                },
            },
            {
                name: '柯桥区',
                value: inputData[3],
                itemStyle: {                // 单个区域的样式设置
                    color: '#3f93d3',
                },
            },
            {
                name: '诸暨市',
                value: inputData[6],
                itemStyle: {                // 单个区域的样式设置
                    color: '#1bbac4',
                }
            },
            {
                name: '嵊州市',
                value: inputData[7],
                itemStyle: {                // 单个区域的样式设置
                    color: '#0ac88f',
                },
            },
            {
                name: '新昌县',
                value: inputData[5],
                itemStyle: {                // 单个区域的样式设置
                    color: '#12c0ae',
                },
            }
        ];        //构造
        let option = {
            tooltip: { // 提示框
                trigger: 'item',
                formatter: function (params) {                    //console.log(params)
                    return params.name + ":" + params.value;
                }
            },
            series: [
                {
                    name: '绍兴',
                    type: 'map3D',
                    map: '绍兴',  //必须和上面注册的地图名称一致，详细可以看ECharts的GL配置说明
                    boxDepth: 100, //地图倾斜度
                    regionHeight: 2, //地图厚度                    light: {
                        main: {
                            intensity: 1.5
                        }
                    },
                    label: {
                        show: true, //是否显示市                        textStyle: {
                            color: "#333333", //文字颜色
                            fontSize: 16, //文字大小
                            fontFamily: '微软雅黑',
                            backgroundColor: "rgba(0,0,0,0)", //透明度0清空文字背景                        },
                    },
                    data: data2,
                    itemStyle: {
                        opacity: 1, // 透明度
                        borderWidth: 1, //分界线宽度
                        borderColor: "#808080", //分界线颜色
                        color: "#ffffff"
                    },
                    emphasis: {
                        itemStyle: {
                            color: "#D3D3D3"
                        },
                    },
                    groundplane: {
                        show: false
                    },
                    shading: 'realistic',                    // 真实感材质相关配置 shading: 'realistic'时有效                    realisticMaterial: {
                        detailTexture: '#fff', // 纹理贴图
                        textureTiling: 1, // 纹理平铺，1是拉伸，数字表示纹理平铺次数
                        roughness: 0, // 材质粗糙度，0完全光滑，1完全粗糙
                        metalness: 0, // 0材质是非金属 ，1金属
                        roughnessAdjust: 0
                    },
                    viewControl: {
                        distance: 135, // 地图视角 控制初始大小
                        rotateSensitivity: 1, // 旋转
                        zoomSensitivity: 1, // 缩放                    },
                }

            ],
        };
        myChart.setOption(option);
    });

最终效果