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index.js
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index.js
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// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
const { writeFileSync } = require('fs');
const { ChartJSNodeCanvas } = require('chartjs-node-canvas');
// Render the chart described in interests.json and output as svg:
function render () {
const width = 400;
const height = 300;
const type = 'svg';
const chartJSNodeCanvas = new ChartJSNodeCanvas({
type,
width,
height,
chartCallback: ChartJS => {
ChartJS.defaults.global.defaultFontStyle = 'bold';
}
});
const configuration = {
type: 'pie',
data: chartData()
};
const image = chartJSNodeCanvas.renderToBufferSync(configuration);
writeFileSync('./interests.svg', image);
}
// Transform the data in interests.json to a format useable by Chart.js:
function chartData () {
const interests = require('./interests');
const labels = [];
const dataset = {
label: "Ben's interests",
data: [],
backgroundColor: []
};
for (const interest of interests) {
labels.push(interest.interest);
dataset.data.push(interest.timeSpent);
dataset.backgroundColor.push(interest.color);
}
return {
labels,
datasets: [dataset]
};
}
module.exports = {
chartData
};
if (require.main === module) {
render();
}