[brlcad-commits] SF.net SVN: brlcad:[55478] brlcad/trunk/src/libged

[<n_...@us...>]

Revision: 55478
          http://sourceforge.net/p/brlcad/code/55478
Author:   n_reed
Date:     2013-05-16 19:27:51 +0000 (Thu, 16 May 2013)
Log Message:
-----------
Until we have something more generic working, breps need a decent average curve length estimate for LOD plotting. Can't put C++ in draw.c, so the calculation routine is getting its own file.

Modified Paths:
--------------
    brlcad/trunk/src/libged/CMakeLists.txt
    brlcad/trunk/src/libged/draw.c

Added Paths:
-----------
    brlcad/trunk/src/libged/draw_calc.cpp

Modified: brlcad/trunk/src/libged/CMakeLists.txt
===================================================================
--- brlcad/trunk/src/libged/CMakeLists.txt	2013-05-16 19:14:04 UTC (rev 55477)
+++ brlcad/trunk/src/libged/CMakeLists.txt	2013-05-16 19:27:51 UTC (rev 55478)
@@ -76,6 +76,7 @@
   dg_obj.c
   dir2ae.c
   draw.c
+  draw_calc.cpp
   dump.c
   dup.c
   eac.c

Modified: brlcad/trunk/src/libged/draw.c
===================================================================
--- brlcad/trunk/src/libged/draw.c	2013-05-16 19:14:04 UTC (rev 55477)
+++ brlcad/trunk/src/libged/draw.c	2013-05-16 19:27:51 UTC (rev 55478)
@@ -35,6 +35,8 @@
 
 #include "./ged_private.h"
 
+/* defined in draw_calc.cpp */
+extern fastf_t brep_est_avg_curve_len(struct rt_brep_internal *bi);
 
 /* declare our callbacks used by _ged_drawtrees() */
 static int drawtrees_depth = 0;
@@ -687,6 +689,17 @@
 	    case DB5_MINORTYPE_BRLCAD_BOT:
 		point_spacing = view_avg_sample_spacing(gvp);
 		break;
+	    case DB5_MINORTYPE_BRLCAD_BREP: {
+		struct rt_brep_internal *bi;
+
+		RT_CK_DB_INTERNAL(ip);
+		bi = (struct rt_brep_internal *)ip->idb_ptr;
+		RT_BREP_CK_MAGIC(bi);
+
+		point_spacing = solid_point_spacing(gvp,
+			brep_est_avg_curve_len(bi) * (2.0 / M_PI) * 2.0);
+	    }
+		break;
 	    default:
 		point_spacing = solid_point_spacing(gvp, sp->s_size);
 	}

Added: brlcad/trunk/src/libged/draw_calc.cpp
===================================================================
--- brlcad/trunk/src/libged/draw_calc.cpp	                        (rev 0)
+++ brlcad/trunk/src/libged/draw_calc.cpp	2013-05-16 19:27:51 UTC (rev 55478)
@@ -0,0 +1,77 @@
+/*                   D R A W _ C A L C . C P P
+ * BRL-CAD
+ *
+ * Copyright (c) 2013 United States Government as represented by
+ * the U.S. Army Research Laboratory.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * version 2.1 as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this file; see the file named COPYING for more
+ * information.
+ */
+/** @file draw_calc.cpp
+ *
+ * Utility functions for miscellaneous draw calculations.
+ *
+ */
+
+#include "common.h"
+#include "bu.h"
+#include "brep.h"
+#include "raytrace.h"
+#include "rtgeom.h"
+
+__BEGIN_DECLS
+
+static fastf_t
+brep_avg_curve_bbox_diagonal_len(ON_Brep *brep)
+{
+    fastf_t avg_curve_len;
+    int i, num_curves = 0;
+
+    for (i = 0; i < brep->m_E.Count(); ++i) {
+	ON_BrepEdge &e = brep->m_E[i];
+	const ON_Curve *crv = e.EdgeCurveOf();
+
+	if (!crv->IsLinear()) {
+	    ++num_curves;
+
+	    ON_BoundingBox bbox;
+	    if (crv->GetTightBoundingBox(bbox)) {
+		avg_curve_len += bbox.Diagonal().Length();
+	    } else {
+		ON_3dVector linear_approx =
+		    crv->PointAtEnd() - crv->PointAtStart();
+		avg_curve_len += linear_approx.Length();
+	    }
+	}
+    }
+    avg_curve_len /= num_curves;
+
+    return avg_curve_len;
+}
+
+fastf_t
+brep_est_avg_curve_len(struct rt_brep_internal *bi)
+{
+    return brep_avg_curve_bbox_diagonal_len(bi->brep) * 2.0;
+}
+
+__END_DECLS
+
+// Local Variables:
+// tab-width: 8
+// mode: C++
+// c-basic-offset: 4
+// indent-tabs-mode: t
+// c-file-style: "stroustrup"
+// End:
+// ex: shiftwidth=4 tabstop=8


Property changes on: brlcad/trunk/src/libged/draw_calc.cpp
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