Questions on Kendo UI for Angular Forum

1 question

0 answers

57 views

What are these numbers in the fitting chart to page size example?

Under the export options for charts, there's an example of how to fit a chart to the size of your paper. Part of this example includes some kind of conversion function and a rectangle constant.

function mm(val: number): number {
  return val * 2.8347;
}

const PAGE_RECT = new geometry.Rect([0, 0], [mm(210 - 20), mm(297 - 20)]);

However, there is absolutely no explanation for these numbers. Am I converting to or from millimeters, and what's the other unit? Why am I doing this? Where are these 210 and 297 numbers coming from in the page rectangle? I can see that the minus 20 is accounting for the 1cm margin set in the PDF below, but other than that I have no idea what the origin of these numbers is.

Can someone please translate these magic numbers? Telerik, can you please add comments to the example code explaining?