1 files changed, 84 insertions, 0 deletions
diff --git a/sys/gio/sgikern/sgidrawch.x b/sys/gio/sgikern/sgidrawch.x
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+++ b/sys/gio/sgikern/sgidrawch.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<math.h>
+include	<gki.h>
+include	<gset.h>
+include	"sgi.h"
+include	"font.h"
+
+define	ITALIC_TILT	0.30	# fraction of xsize to tilt italics at top
+
+
+# SGI_DRAWCHAR -- Draw a character of the given size and orientation at the
+# given position.
+
+int procedure sgi_drawchar (ch, x, y, xsize, ysize, orien, font)
+
+char	ch			# character to be drawn
+int	x, y			# lower left GKI coords of character
+int	xsize, ysize		# width, height of char in GKI units
+int	orien			# orientation of character (0 degrees normal)
+int	font			# desired character font
+
+int	mx, my
+real	px, py, coso, sino, theta
+int	stroke, tab1, tab2, i, pen, width
+int	bitupk()
+include	"font.com"
+include	"greek.com"
+include	"sgi.com"
+
+begin
+	if (ch < CHARACTER_START || ch > CHARACTER_END)
+	    i = '?' - CHARACTER_START + 1
+	else
+	    i = ch  - CHARACTER_START + 1
+
+	# Set the font.
+	call sgi_font (font)
+
+	if (font == GT_GREEK) {
+	    width = gchwid[i]
+	    tab1 = gchidx[i]
+	    tab2 = gchidx[i+1] - 1
+	} else {
+	    width = chrwid[i]
+	    tab1 = chridx[i]
+	    tab2 = chridx[i+1] - 1
+	}
+
+	theta = -DEGTORAD(orien)
+	coso = cos(theta)
+	sino = sin(theta)
+
+	do i = tab1, tab2 {
+	    if (font == GT_GREEK)
+	        stroke = gchtab[i]
+	    else
+	        stroke = chrtab[i]
+
+	    px  = bitupk (stroke, COORD_X_START,   COORD_X_LEN)
+	    py  = bitupk (stroke, COORD_Y_START,   COORD_Y_LEN)
+	    pen = bitupk (stroke, COORD_PEN_START, COORD_PEN_LEN)
+
+	    # Scale size of character.
+	    px = px / width  * xsize
+	    py = py / FONT_HEIGHT * ysize
+
+	    # The italic font is implemented applying a tilt.
+	    if (font == GT_ITALIC)
+		px = px + ((py / ysize) * xsize * ITALIC_TILT)
+
+	    # Rotate and shift.
+	    mx = x + px * coso + py * sino
+	    my = y - px * sino + py * coso
+
+	    # Draw the line segment or move pen.
+	    if (pen == 0)
+		call sgk_move (g_out, mx, my)
+	    else
+		call sgk_draw (g_out, mx, my)
+	}
+
+	return (int(real(width) / real(FONT_WIDTH) * xsize))
+end