Adding Image API tu use in custom functions #198
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Hello!
We wanted to use Quickchart internally and self hosting it using Docker. Everything worked perfectly, until the day we wanted to include images into the labels of the generated charts.
We came across this Stackoverflow answer that shows an example of custom function to achieve that. The only difference is that we're using the Python module, so we couldn't do exactly the same, and had to create the Javascript
Imageobjects on our side. It has to be done on the Chart.js injected script.However, I encounter the issue of
Imagenot being accessible from the inside of Quickchart/Chart.js. By looking at the code of chartjs-node-canvas used by Quickchart, I saw that they added the access to thisImageAPI at v4.1.3This PR is nothing more than the upgrade of the
chartjs-node-canvasmodule to v4.1.3 (and another dependency upgrade fix).Unfortunately in this version they removed the possibility to dynamically instantiate the version of chart.js used, as they load it by their side. But by doing a bit of trickery, I still managed to achieve it.
The python script added is nothing more than an example of usage that perfectly works to reproduce the example from the Stackoverflow's answer.