// returns the zoom level for supplied bounds
// useful when rendering static map images
// pass in 0.0 for maxzoom for no maxzoom
//
// TODO: add padding support
func BoundsZoom(proj crs.ProjectTransformer, bounds geo.LatLngBounds, size geometry.Point, maxZoom float64) float64 {
zoom := 0.0
nw := bounds.NorthWest()
se := bounds.SouthEast()
zoomNotFound := true
for {
zoom++
boundsSize := crs.LatLngToPoint(proj, se, zoom).Subtract(crs.LatLngToPoint(proj, nw, zoom)).Floor()
zoomNotFound = size.Contains(boundsSize)
if zoomNotFound && zoom <= maxZoom {
continue
} else {
break
}
}
// if a maxZoom was set and zoom is greater than maxZoom, return maxZoom
if maxZoom != 0.0 && zoom > maxZoom {
return maxZoom
}
// return the calculated zoom
return zoom
return zoom - 1.0
}
