From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 sys/gio/glabax/glblabel.x | 84 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 sys/gio/glabax/glblabel.x

(limited to 'sys/gio/glabax/glblabel.x')

diff --git a/sys/gio/glabax/glblabel.x b/sys/gio/glabax/glblabel.x
new file mode 100644
index 00000000..ecf57c94
--- /dev/null
+++ b/sys/gio/glabax/glblabel.x
@@ -0,0 +1,84 @@
+# 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
-- 
cgit