[geos-commits] r3437 - trunk/include/geos/operation/buffer

[svn_geos at osgeo.org]

Author: strk
Date: 2011-07-20 02:03:35 -0700 (Wed, 20 Jul 2011)
New Revision: 3437

Modified:
   trunk/include/geos/operation/buffer/BufferOp.h
Log:
Add setSingleSided interface to BufferOp-accessible BufferParam setters

Patch by Tai Meng <tai.meng at safe.com>

Modified: trunk/include/geos/operation/buffer/BufferOp.h
===================================================================
--- trunk/include/geos/operation/buffer/BufferOp.h	2011-07-20 08:46:43 UTC (rev 3436)
+++ trunk/include/geos/operation/buffer/BufferOp.h	2011-07-20 09:03:35 UTC (rev 3437)
@@ -211,6 +211,28 @@
 	inline void setQuadrantSegments(int nQuadrantSegments);
 
 	/**
+	 * Sets whether the computed buffer should be single-sided.
+	 * 
+	 * A single-sided buffer is constructed on only one side
+	 * of each input line.
+	 * 
+	 * The side used is determined by the sign of the buffer distance:
+	 * - a positive distance indicates the left-hand side
+	 * - a negative distance indicates the right-hand side
+	 * 
+	 * The single-sided buffer of point geometries is
+	 * the same as the regular buffer.
+	 *
+	 * The End Cap Style for single-sided buffers is
+	 * always ignored,
+	 * and forced to the equivalent of <tt>CAP_FLAT</tt>.
+	 *
+	 * @param isSingleSided true if a single-sided buffer
+	 *                      should be constructed
+	 */
+	inline void setSingleSided(bool isSingleSided);
+
+	/**
 	 * Returns the buffer computed for a geometry for a given buffer
 	 * distance.
 	 *
@@ -235,6 +257,12 @@
 	bufParams.setEndCapStyle((BufferParameters::EndCapStyle)s);
 }
 
+void
+BufferOp::setSingleSided(bool isSingleSided)
+{
+   bufParams.setSingleSided(isSingleSided);
+}
+
 } // namespace geos::operation::buffer
 } // namespace geos::operation
 } // namespace geos