Custom Label in the Center
To customize the doughnut's center, declare the SVG markup in the centerTemplate. This template accepts the PieChart instance. Use this instance to call widget methods. For example, call the getInnerRaduis() method to get the radius of the doughnut hole.
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<template>
<div>
<div class="long-title"><h3>Energy Production (GWh, 2016)</h3></div>
<div class="pies-container">
<dx-pie-chart
v-for="country in countries"
id="pie-chart"
:key="country"
:data-source="data.filter(i=>i.country===country)"
:inner-radius="0.65"
resolve-label-overlapping="shift"
size-group="piesGroup"
type="doughnut"
center-template="centerTemplate"
>
<dx-series
argument-field="commodity"
value-field="total"
>
<dx-label
:visible="true"
:customize-text="customizeLabel"
background-color="none"
format="fixedPoint"
>
<dx-connector :visible="true"/>
</dx-label>
</dx-series>
<dx-legend :visible="false"/>
<template #centerTemplate="{ data }">
<center-template :pie-chart="data"/>
</template>
</dx-pie-chart>
</div>
</div>
</template>
<script>
import { data } from './data.js';
import { DxPieChart, DxSeries, DxExport, DxTooltip, DxLegend, DxLabel, DxConnector } from 'devextreme-vue/pie-chart';
import CenterTemplate from './CenterTemplate.vue';
export default {
components: {
DxPieChart, DxSeries, DxExport, DxTooltip, DxLegend, DxLabel, DxConnector, CenterTemplate
},
data() {
return {
data: data,
countries: Array.from(new Set(data.map(item => item.country)))
};
},
methods: {
customizeLabel({ argumentText, valueText }) {
return `${argumentText}\n${valueText}`;
}
}
};
</script>
<style scoped>
.pies-container {
margin: auto;
width: 800px;
}
.pies-container > div {
width: 400px;
float: left;
margin-top: -50px;
}
.long-title h3 {
font-weight: 200;
font-size: 28px;
text-align: center;
margin-bottom: 20px;
}
</style>
<template>
<svg>
<circle
:r="pieChart.getInnerRadius() - 6"
cx="100"
cy="100"
fill="#eee"
/>
<image
:href="getImagePath(country)"
x="70"
y="58"
width="60"
height="40"
/>
<text
:style="{fontSize: 18, fill:"#494949"}"
text-anchor="middle"
x="100"
y="120"
>
<tspan x="100">{{ country }}</tspan><tspan
:style="{ fontWeight: 600 }"
x="100"
dy="20px"
>{{ calculateTotal(pieChart) }}</tspan>
</text>
</svg>
</template>
<script>
const formatNumber = new Intl.NumberFormat('en-US', {
minimumFractionDigits: 0
}).format;
export default {
props: {
pieChart: {
type: Object,
default: () => ({})
}
},
data() {
return {
country: this.pieChart.getAllSeries()[0].getVisiblePoints()[0].data.country
};
},
methods: {
getImagePath(country) {
return `../../../../images/flags/${ country.replace(/\s/, '').toLowerCase() }.svg`;
},
calculateTotal(pieChart) {
return formatNumber(pieChart.getAllSeries()[0].getVisiblePoints().reduce((s, p) => s + p.originalValue, 0));
}
}
};
</script>
import Vue from 'vue';
import App from './App.vue';
new Vue({
el: '#app',
components: { App },
template: '<App/>'
});
<!DOCTYPE html>
<html>
<head>
<title>DevExtreme Demo</title>
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.common.css" />
<link rel="stylesheet" type="text/css" href="https://cdn3.devexpress.com/jslib/19.2.4/css/dx.light.css" />
<script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
<script src="https://unpkg.com/systemjs@0.21.3/dist/system.js"></script>
<script type="text/javascript" src="config.js"></script>
<script type="text/javascript">
System.import('./index.js');
</script>
</head>
<body class="dx-viewport">
<div class="demo-container">
<div id="app">
</div>
</div>
</body>
</html>
export const data = [
{ country: 'France', commodity: 'Nuclear', total: 403195 },
{ country: 'Germany', commodity: 'Nuclear', total: 84634 },
{ country: 'France', commodity: 'Thermal', total: 57471 },
{ country: 'Germany', commodity: 'Thermal', total: 419591 },
{ country: 'France', commodity: 'Wind', total: 21400 },
{ country: 'Germany', commodity: 'Wind', total: 78598 },
{ country: 'France', commodity: 'Solar', total: 8160 },
{ country: 'Germany', commodity: 'Solar', total: 38098 },
{ country: 'France', commodity: 'Tidal, Wave', total: 501 }
];
System.config({
transpiler: 'plugin-babel',
paths: {
'npm:': 'https://unpkg.com/'
},
map: {
vue: 'npm:vue@2.6.3/dist/vue.esm.browser.js',
'vue-loader': 'npm:dx-systemjs-vue-browser@latest/index.js',
'devextreme': 'npm:devextreme@19.2',
'devextreme-vue': 'npm:devextreme-vue@19.2',
jszip: 'npm:jszip@3.1.3/dist/jszip.min.js',
'quill': 'npm:quill@1.3.7/dist/quill.js',
'devexpress-diagram': 'npm:devexpress-diagram',
'devexpress-gantt': 'npm:devexpress-gantt',
'plugin-babel': 'npm:systemjs-plugin-babel@0/plugin-babel.js',
'systemjs-babel-build':
'npm:systemjs-plugin-babel@0/systemjs-babel-browser.js'
},
meta: {
'*.vue': { loader: 'vue-loader' }
},
packages: {
'devextreme-vue': {
main: 'index.js'
},
'devextreme': {
defaultExtension: 'js'
}
},
babelOptions: {
sourceMaps: false,
stage0: true
}
});