Computes a zoom for a viewport size: actual size, or the zoom at which a page's spread and its padding fit.
public double GetZoom(ZoomMode mode, double viewportWidth, double viewportHeight, int pageIndex, double actualSize = 1)
The zoom to compute.
The viewport's width in pixels.
The viewport's height in pixels.
The page whose spread is fitted.
The pixels per point at actual size: 1 for 72 DPI pixels, 96 / 72 for CSS pixels, times the pixel ratio for device pixels.