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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_LABEL_AXIS -- Label an axis. If both axes were drawn only the first is
# labelled, otherwise the label is placed on withever axis was drawn. This is
# done by drawing the axis labels just outside the tick mark labels, wherever
# those happened to be. The axis label offset is in the same direction as the
# tick label offset and is centered on each axis. The distance from the axis
# is a function of the size of the tick labels.
procedure glb_label_axis (gp, ax, xlabel, ylabel)
pointer gp # graphics descriptor
pointer ax # axis descriptor
char xlabel[ARB] # X axis label
char ylabel[ARB] # Y axis label
int wcs
real x1, x2, y1, y2, x, y, dx, dy
real char_height, char_width
int strlen()
real ggetr()
begin
wcs = GP_WCS(gp)
# Get character height and width in NDC coords.
char_height = ggetr (gp, "ch")
char_width = ggetr (gp, "cw")
if (char_height < EPSILON)
char_height = DEF_CHARHEIGHT
if (char_width < EPSILON)
char_width = DEF_CHARWIDTH
# Compute axis center in NDC coords.
call gctran (gp, AX_START(ax,1), AX_START(ax,2), x1,y1, wcs, 0)
call gctran (gp, AX_END(ax,1), AX_END(ax,2), x2,y2, wcs, 0)
x = (x1 + x2) / 2.0
y = (y1 + y2) / 2.0
# Set relative text size and get device character size for a text
# size of 1.0. Set WCS to NDC coords since the offset to the
# tick label is in NDC coordinates.
call gsetr (gp, G_TXSIZE, AX_AXISLABELSIZE(ax))
call gseti (gp, G_WCS, 0)
# Draw the axis label.
if (AX_HORIZONTAL(ax) == YES) {
# Axis is horizontal. Tick label vector tells us whether to
# draw axis label above or below axis.
if (strlen (xlabel) > 0) {
dy = 2.0 * AX_TICKLABELSIZE(ax) * char_height +
0.5 * AX_AXISLABELSIZE(ax) * char_height
if (AX_TICKLABELOFFSET(ax,2) < 0)
dy = -dy
call gtext (gp, x, y + dy, xlabel, "hj=c;vj=c")
}
} else {
# Axis is vertical. Always put label fixed distance from axis
# regardless of size of tick labels (for consistency and to
# avoid clipping at the device screen boundary). Label runs
# bottom to top in a vertical field with char up pointing to
# the left.
if (strlen (ylabel) > 0) {
dx = (Y_LABELOFFSET * char_width * AX_TICKLABELSIZE(ax)) +
0.5 * AX_AXISLABELSIZE(ax) * char_height
if (AX_TICKLABELOFFSET(ax,1) < 0)
dx = -dx
call gtext (gp, x + dx, y, ylabel, "up=180;hj=c;vj=c")
}
}
call gseti (gp, G_WCS, wcs)
end
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