** This is part of the CTSim program
** Copyright (C) 1983-2000 Kevin Rosenberg
**
-** $Id: sgp.cpp,v 1.2 2000/06/19 19:04:05 kevin Exp $
+** $Id: sgp.cpp,v 1.4 2000/07/11 10:32:44 kevin Exp $
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License (version 2) as
sgp2_close (SGP_ID gid)
{
#if HAVE_G2_H
+ if (gid)
g2_close (gid->g2_id);
#endif
- if (gid == _sgp2_cwin)
- _sgp2_cwin = NULL;
+ if (gid == _sgp2_cwin)
+ _sgp2_cwin = NULL;
- delete gid;
+ delete gid;
}
void
}
+/* NAME
+ * sgp2_draw_rect Draw box in graphics mode
+ *
+ * SYNOPSIS
+ * drawbox (xmin, ymin, xmax, ymax)
+ * double xmin, ymin Lower left corner of box
+ * double xmax, ymax Upper left corner of box
+ *
+ * NOTES
+ * This routine leaves the current position of graphic cursor at lower
+ * left corner of box.
+ */
+
+void
+sgp2_draw_rect(double xmin, double ymin, double xmax, double ymax)
+{
+ sgp2_move_abs (xmin, ymin);
+ sgp2_line_abs (xmax, ymin);
+ sgp2_line_abs (xmax, ymax);
+ sgp2_line_abs (xmin, ymax);
+ sgp2_line_abs (xmin, ymin);
+}
+
+/* FUNCTION
+ * sgp2_circle - draw circle of radius r at current center
+ */
+
+void
+sgp2_draw_circle (const double r)
+{
+ sgp2_draw_arc (0.0, 7.0, r);
+}
+
+/*==============================================================*/
+/* draw arc around current center. pass angles and radius */
+/*==============================================================*/
+
+void
+sgp2_draw_arc (double start, double stop, const double r)
+{
+ double c, s, theta, angle;
+ float x, y, xp, yp;
+
+ if ((stop-start) > 2 * PI)
+ stop = start + 2 * PI;
+ if ((start-stop) > 2 * PI)
+ stop = start + 2 * PI;
+ while (start >= stop)
+ stop += 2*PI;
+
+ x = r * cos ((double) start);
+ y = r * sin ((double) start);
+ sgp2_move_rel (x, y); /* move from center to start of arc */
+
+ theta = 5 * PI / 180;
+ c = cos(theta);
+ s = sin(theta);
+
+ for (angle = start; angle < stop - theta; angle += theta) {
+ xp = c * x - s * y;
+ yp = s * x + c * y;
+ sgp2_line_rel (xp - x, yp - y);
+ x = xp; y = yp;
+ }
+
+ c = cos (stop - angle);
+ s = sin (stop - angle);
+ xp = c * x - s * y;
+ yp = s * x + c * y;
+ sgp2_line_rel (xp - x, yp - y);
+
+ x = r * cos ((double) stop);
+ y = r * sin ((double) stop);
+ sgp2_move_rel (-x, -y); /* move back to center of circle */
+}
+
+
/*----------------------------------------------------------------------*/
/* Current Transformation Matrix Routine */
/*----------------------------------------------------------------------*/