小程序使用 f2 总结

使用 npm 模块

在小程序根目录中

npm init  初始化

npm install @antv/f2-canvas 加载模块

 

在微信开发者工具中 菜单栏>工具>构建npm

（要先加载模块然后再构建）

 

 

在要使用图表的页面

.json中的  usingComponents 下添加

"ff-canvas": "@antv/f2-canvas"  

//ff-canvas 为自定义 但不可大写

.wxml

.js

data: {
    opts: {
      onInit: initChart
    }
  },

//page外面
function initChart(canvas, width, height, F2) {
    const data = [{ "year": 1997, "type": "United States", "value": 4.9 }, { "year": 1998, "type": "United States", "value": 4.5 }, { "year": 1998, "type": "Florida", "value": 4.3 }, { "year": 1999, "type": "United States", "value": 4.2 }, { "year": 1999, "type": "Florida", "value": 3.9 }, { "year": 2000, "type": "United States", "value": 4 }, { "year": 2000, "type": "Florida", "value": 3.7 }, { "year": 2001, "type": "United States", "value": 4.7 }, { "year": 2001, "type": "Florida", "value": 4.7 }, { "year": 2002, "type": "United States", "value": 5.8 }, { "year": 2002, "type": "Florida", "value": 5.6 }, { "year": 2003, "type": "United States", "value": 6 }, { "year": 2003, "type": "Florida", "value": 5.2 }, { "year": 2004, "type": "United States", "value": 5.5 }, { "year": 2004, "type": "Florida", "value": 4.6 }, { "year": 2005, "type": "United States", "value": 5.1 }, { "year": 2005, "type": "Florida", "value": 3.7 }, { "year": 2006, "type": "United States", "value": 4.6 }, { "year": 2006, "type": "Florida", "value": 3.2 }, { "year": 2007, "type": "United States", "value": 4.6 }, { "year": 2007, "type": "Florida", "value": 4 }, { "year": 2008, "type": "United States", "value": 5.8 }, { "year": 2008, "type": "Florida", "value": 6.3 }, { "year": 2009, "type": "United States", "value": 9.3 }, { "year": 2009, "type": "Florida", "value": 10.4 }, { "year": 2010, "type": "United States", "value": 9.6 }, { "year": 2010, "type": "Florida", "value": 11.1 }, { "year": 2011, "type": "United States", "value": 8.9 }, { "year": 2011, "type": "Florida", "value": 10 }, { "year": 2012, "type": "United States", "value": 8.1 }, { "year": 2012, "type": "Florida", "value": 8.5 }, { "year": 2013, "type": "United States", "value": 7.4 }, { "year": 2013, "type": "Florida", "value": 7.2 }, { "year": 2014, "type": "United States", "value": 6.2 }, { "year": 2014, "type": "Florida", "value": 6.3 }, { "year": 2015, "type": "United States", "value": 5.3 }, { "year": 2015, "type": "Florida", "value": 5.4 }, { "year": 2016, "type": "United States", "value": 4.9 }, { "year": 2016, "type": "Florida", "value": 4.9 }, { "year": 2017, "type": "United States", "value": 4.4 }, { "year": 2017, "type": "Florida", "value": 4.3 }];

    chart = new F2.Chart({
        el: canvas,
        width: (wx.getSystemInfoSync().windowWidth * 0.9),
        height: 400
    });

    chart.source(data, {
        year: {
            range: [0, 1],
            ticks: [1997, 1999, 2001, 2003, 2005, 2007, 2009, 2011, 2013, 2015, 2017]
        },
        value: {
            tickCount: 10,
            formatter(val) {
                return val.toFixed(1) + '%';
            }
        }
    });

    chart.tooltip({
        custom: true, // 自定义 tooltip 内容框
        // showXTip: true,
        onChange(obj) {
            console.log(obj);
            const legend = chart.get('legendController').legends.top[0];
            const tooltipItems = obj.items;
            const legendItems = legend.items;
            const map = {};
            legendItems.map(item => {
                map[item.name] = Object.assign({}, item);
            });
            tooltipItems.map(item => {
                const { name, value } = item;
                if (map[name]) {
                    map[name].value = value;
                }
            });
            legend.setItems(Object.values(map));
        },
        onHide() {
            const legend = chart.get('legendController').legends.top[0];
            legend.setItems(chart.getLegendItems().country);
        }
    });

    // chart.guide().rect({
    //   start: [2011, 'max'],
    //   end: ['max', 'min'],
    //   style: {
    //     fill: '#CCD6EC',
    //     opacity: 0.3
    //   }
    // });
    // chart.guide().text({
    //   position: [2014, 'max'],
    //   content: 'Scott administratio\n(2011 to present)',
    //   style: {
    //     fontSize: 10,
    //     textBaseline: 'top'
    //   }
    // });

    chart.line().position('year*value').color('type', val => {
        if (val === 'United States') {
            return '#ccc';
        }
    });
    chart.render();
    return chart;
}

 

 

package.json文件 

{
  "name": "test",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "dependencies": {
    "@antv/f2-canvas": "^1.0.5",
    "miniprogram-sm-crypto": "^0.1.0" // 小程序所需模块
  },
  "devDependencies": {},
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "",
  "license": "ISC"
}

 

在使用中 我封装了一个自定义组件  但是我在使用时同一页面中加载多个组件后  因为表格所加载的数据在page() 外面 所以后面的数据会覆盖前面的  目前没有找到很合适的解决方法  望大佬指教