svg+echarts实现自定义厂区平面图

一、最终效果

最终效果图

二、设计思路

  • 身为后端开发，对前端的理解致涉及基础的html+css+js这老三样，等上手做项目的时候发现还是掌握不够。
  • 思路来源于这篇文章，通过svg矢量图来实现自定义地图。
  • 最初也只是打算通过上述的方式来实现，但echarts又有很强的图表功能，不忍放弃。遂又从网上发现了另一个开源项目，该项目通过将svg转为geojson数据，通过echarts实现自定义地图功能，正好满足我的需求。

三、开发步骤

3.1 在AI中画矢量图，并保存为svg格式

  1. 作为专业的设计软件，AI可以画矢量图，但由于能力首先，作者花了两杯喜茶的钱，请专业设计师学姐帮我画了矢量图。

  1. 将矢量图存储为svg格式，编码选择utf-8，可查看svg源码。

3.2 使用svg2geojson插件，将svg转为geojson格式

按照该项目的插件，将准备好的svg按步骤转化为geojson文件

3.3 使用echarts，展现效果

  • 由于单位隐私要求，只展示svg2geojson的代码，供大家参考。

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>Document</title>
  <script src="lib/echarts.min.js"></script>
  <script src="lib/jquery.min.js"></script>
  <script src="json/map/zhongshang-geojson.json"></script>
</head>

<body>
  <div id="main" style="width: 230px;height:300px;margin:0 auto"></div>
  <script>
    function randomData() {
    return Math.round(Math.random() * 1000);
}
var option = {
    visualMap: {
        min: 0,
        max: 1000,
        left: 'left',
        top: 'bottom',
        text: ['高', '低'], // 文本，默认为数值文本
        calculable: true,
        color:["#f6f4aa","#c9e6ea"]
    },
    series: [{
        type: 'map',
        mapType: 'zhongshan',
        left: 0,
        right: 0,
        top: 0,
        bottom: 0,
        roam: false,
        label: {
            normal: {
                show: false
            },
            emphasis: {
                show: true,
                textStyle: {
                    color: "#943b3b"
                }
            }
        },
        itemStyle: {
            normal: {
                borderColor: "#2f3035",
            },
            emphasis: {
                areaColor:"#ff8a6b",
                textStyle: {
                    color: "#fbcacd"
                }
            }
        },
        data: [{
            name: "古镇",
            value: randomData()
        }, {
            name: "小榄镇",
            value: randomData()
        }, {
            name: "东风镇",
            value: randomData()
        }, {
            name: "南头镇",
            value: randomData()
        }, {
            name: "黄圃镇",
            value: randomData()
        }, {
            name: "阜沙镇",
            value: randomData()
        }, {
            name: "三角镇",
            value: randomData()
        }, {
            name: "横栏镇",
            value: randomData()
        }, {
            name: "东升镇",
            value: randomData()
        }, {
            name: "港口镇",
            value: randomData()
        }, {
            name: "民众镇",
            value: randomData()
        }, {
            name: "火炬开发区",
            value: randomData()
        }, {
            name: "坦洲镇",
            value: randomData()
        }, {
            name: "板芙镇",
            value: randomData()
        }, {
            name: "南朗镇",
            value: randomData()
        }, {
            name: "三乡镇",
            value: randomData()
        }, {
            name: "大涌镇",
            value: randomData()
        }, {
            name: "石岐区",
            value: randomData()
        }, {
            name: "五桂山镇",
            value: randomData()
        }, {
            name: "南区",
            value: randomData()
        }, {
            name: "沙溪镇",
            value: randomData()
        }, {
            name: "西区",
            value: randomData()
        }, {
            name: "东区",
            value: randomData()
        }, {
            name: "神湾镇",
            value: randomData()
        }]

    }]
};

/*$.get('zhongshang-geojson.json', function(geoJson) {
    echarts.registerMap('zhongshan', geoJson);
    var chart = echarts.init(document.getElementById('main'));
    chart.setOption(option);
});*/

//在线编辑器不能跨域所以使用下面代码导入geojson
var 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echarts.registerMap('zhongshan', geoJson);
    var chart = echarts.init(document.getElementById('main'));
    chart.setOption(option);
  </script>
</body>

</html>

四、踩的坑

4.1 正确的svg格式

  • 矢量图需要通过钢笔工具画出封闭路径，才能正确通过svg2geojson插件转化为geojson数据。

4.2 svg的<rect>标签在geojson中无点坐标

  • 出现这个问题的原因是，svg中的rect标签，即矩形标签，通过插件转换后，在geojson中是polygon，即多边形。但由于通过观察svg的代码发现，rect标签并非由多个点构成的面，而是以原点+宽高的形式表现，插件只能将polygon正确转化，rect则不行。

  • 解决办法：在AI中在矩形图像中，多添加几个锚点，将其转为polygon，最后再导出

4.3 最后在浏览器中，地图上下颠倒180度

  • 这是个小坑，有人也在gitee项目中留言并有解决办法，svg和geojson的坐标系不一致，会导致实际效果图是上下颠倒的状态，因此，最好在AI中预先矢量图上下颠倒，再存储为svg。

Last modification：November 16th, 2021 at 09:19 pm
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