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const ChartjsNode = require('chartjs-node'); | |
// 600x600 canvas size | |
var chartNode = new ChartjsNode(600, 600); | |
var randomnumber=Math.random(); | |
var imagename = "testimage"+randomnumber+".png" | |
module.exports = imagename | |
// each api returns a Promise | |
chartNode.drawChart({ | |
type: 'bar', | |
data: { | |
labels: ["2007", "2008", "2009", "2010", "2011", "2012", "2013", "2014", "2015", "2016", "2017"], | |
datasets: [{ | |
label: 'Antal akkrediteringer', | |
data: [57, 125, 249, 262, 271, 289, 227, 98, 126, 93, 41], | |
backgroundColor: [ | |
'rgba(54, 162, 235, 0.2)', | |
'rgba(54, 162, 235, 0.2)', | |
'rgba(54, 162, 235, 0.2)', | |
'rgba(54, 162, 235, 0.2)', | |
'rgba(54, 162, 235, 0.2)', | |
'rgba(54, 162, 235, 0.2)', | |
'rgba(54, 162, 235, 0.2)', | |
'rgba(54, 162, 235, 0.2)', | |
'rgba(54, 162, 235, 0.2)', | |
'rgba(54, 162, 235, 0.2)', | |
'rgba(54, 162, 235, 0.2)' | |
], | |
borderColor: [ | |
'rgba(54, 162, 235, 1)', | |
'rgba(54, 162, 235, 1)', | |
'rgba(54, 162, 235, 1)', | |
'rgba(54, 162, 235, 1)', | |
'rgba(54, 162, 235, 1)', | |
'rgba(54, 162, 235, 1)', | |
'rgba(54, 162, 235, 1)', | |
'rgba(54, 162, 235, 1)', | |
'rgba(54, 162, 235, 1)', | |
'rgba(54, 162, 235, 1)', | |
'rgba(54, 162, 235, 1)' | |
], | |
borderWidth: 1 | |
}] | |
}, | |
options: { | |
layout: { | |
padding:{ | |
left: 30, | |
right: 30, | |
top: 30, | |
bottom: 30 | |
} | |
}, | |
scales: { | |
yAxes: [{ | |
ticks: { | |
beginAtZero: true | |
} | |
}] | |
} | |
} | |
}) | |
.then(() => { | |
// now we have a chart | |
// lets get the image stream | |
return chartNode.getImageStream('image/png'); | |
}) | |
.then(imageStream => { | |
// now you can do anything with the image, like upload to S3 | |
// lets get the image buffer | |
return chartNode.getImageBuffer('image/png'); | |
}) | |
.then(imageBuffer => { | |
// now you can modify the raw PNG buffer if you'd like | |
// want to write the image directly to the disk, no problem | |
return chartNode.writeImageToFile('image/png', '/home/nicki/akkredibot/img/'+imagename); | |
}) | |
.then(() => { | |
chartNode.destroy() | |
}); |
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