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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include <gset.h>
include <gio.h>
include "glabax.h"
# GLB_VERIFY_LOG_SCALING -- Verify that log scaling makes sense, i.e., that
# the range covered by an axis compared to its distance from the origin is
# large enough to permit log scaling. If log scaling is reasonable check if
# the window goes negative, and switch to ELOG scaling if such is the case.
procedure glb_verify_log_scaling (gp)
pointer gp # graphics descriptor
pointer w
begin
w = GP_WCSPTR (gp, GP_WCS(gp))
# Force ELOG scaling if any data <= 0.
if (WCS_XTRAN(w) != LINEAR)
if (WCS_WX1(w) <= 0 || WCS_WX2(w) <= 0)
WCS_XTRAN(w) = ELOG
if (WCS_YTRAN(w) != LINEAR)
if (WCS_WY1(w) <= 0 || WCS_WY2(w) <= 0)
WCS_YTRAN(w) = ELOG
# Set the WCS state to modified even if it wasn't. This is safe
# and in any case the WCS is changed in the main glabax routine
# shortly after we are called.
GP_WCSSTATE(gp) = MODIFIED
end
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