Resolution low on hi-dpi screen

[ArchaicDuck]

I have a hi-dpi screen and the canvas resolution is really low.

I know this is a canvas problem and easily fixed by scaling the canvas to double, then halving it with css styling. But I could not properly do it without breaking the chart.

Example code:
`canvas.width = 2000;

canvas.height = 2000;

canvas.style.width = "1000px";

canvas.style.height = "1000px";`