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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <gio.h>
# GLB_SETUP -- Set up the axis drawing and labelling parameters. These are
# the coordinate transformations, i.e., log scaling, window and viewport
# coordinates, plus the parameters which pertain only to axis drawing and
# labelling. The order in which the subprocedures are called is significant.
procedure glb_setup (gp, axes, ntitlelines, xlabel, ylabel)
pointer gp # graphics descriptor
pointer axes[4] # array of pointers to axis descriptors
int ntitlelines # number of lines in title block
char xlabel[ARB] # x axis label
char ylabel[ARB] # y axis label
pointer w
bool fp_nondegenr()
begin
w = GP_WCSPTR (gp, GP_WCS(gp))
# Verify that there is sufficient range in the wcs X and Y.
if (fp_nondegenr (WCS_WX1(w), WCS_WX2(w)))
GP_WCSSTATE(gp) = MODIFIED
if (fp_nondegenr (WCS_WY1(w), WCS_WY2(w)))
GP_WCSSTATE(gp) = MODIFIED
# If log scaling is in effect on either axis, verify that log scaling
# is sensible and if so select either LOG or ELOG scaling.
call glb_verify_log_scaling (gp)
# Set the viewport if not already set.
call glb_set_viewport (gp, ntitlelines, xlabel, ylabel)
# Find the best positions for the tick marks, and if rounding is
# enabled, extend the WCS outward to the next tick mark on either
# end.
call glb_find_ticks (gp, GP_XAP(gp), axes[1], axes[4], 0)
call glb_find_ticks (gp, GP_YAP(gp), axes[3], axes[2], 90)
# Set the remaining parameters in the axis drawing descriptors.
# Must not be called until the window and viewport coordinates are
# fixed.
call glb_set_axes (gp, GP_XAP(gp), axes[1], axes[4], 0)
call glb_set_axes (gp, GP_YAP(gp), axes[3], axes[2], 90)
end
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