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authormarha <marha@users.sourceforge.net>2012-09-03 09:54:39 +0200
committermarha <marha@users.sourceforge.net>2012-09-04 14:23:32 +0200
commitc18d12d1e36354ff32724c86ae25374d1a78607f (patch)
tree3db58d40725863f1d1145002f998a6cf0662fbf9 /mesalib/src/glu/sgi/libnurbs/nurbtess/partitionY.h
parent77f54d0b20cc194e708bc664740e4c0b0e13c3dd (diff)
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mesa xkeyboard-config git update 3 sep 2012
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-/*
- * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
- * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice including the dates of first publication and
- * either this permission notice or a reference to
- * http://oss.sgi.com/projects/FreeB/
- * shall be included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
- * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
- * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE.
- *
- * Except as contained in this notice, the name of Silicon Graphics, Inc.
- * shall not be used in advertising or otherwise to promote the sale, use or
- * other dealings in this Software without prior written authorization from
- * Silicon Graphics, Inc.
- */
-/*
- *partitionY.h:
- *partition a polygon into a Y-monotone polygon:
- * A polygon is Y-monotone if the boundary can be split into two polygon chains
- *A and B such that each chain is Y-monotonic that is the intersection of any
- *horizontal line intersects each chain has at most one connected componenets
- * (empty, single point or a single line).
- *
- * A vertex is a cusp if both its ajacent vertices are either at or above v,
- *or both at or below v. In addition, at least one of the ajacent verteces is
- *strictly below or above v.
- * A vertex is a relex vertex if the internals angle is strictly greater than
- *180. In other words, if the signed area is negative:
- *(x1, y1), (x2, y2), (x3, y3) are the three vertices along a polygon, the
- *order is such that left hand side is inside the polygon. Then (x2,y2) is
- *reflex if:
- * (x2-x1, y2-y1) cross (x3-x1, y3-y1) <0.
- *A vertex is an interior cusp if it is a cusp and a reflex.
- *A vertex is an exterior cusp if it is a cusp but not a reflex.
- *
- */
-
-#ifndef _PARTITIONY_H
-#define _PARTITIONY_H
-
-#include "directedLine.h"
-
-/*whether an edge is below a vertex*/
-Int isBelow(directedLine *v, directedLine *e);
-
-/*whether an edge is above a vertex*/
-Int isAbove(directedLine *v, directedLine *e);
-
-/*not-cusp,
- *inerior cusp
- *exterior cusp
- */
-Int cuspType(directedLine *v);
-
-/*used in trapezoidalization*/
-typedef struct sweepRange{
- directedLine *left;
- Int leftType; /*either a vertex (leftType=0) or an edge (leftType =1) */
- directedLine *right;
- Int rightType; /*either a vertex (rightType=0) or an edge (rightType =1) */
-} sweepRange;
-
-sweepRange* sweepRangeMake(directedLine* left, Int leftType,
- directedLine* right, Int rightType);
-
-void sweepRangeDelete(sweepRange* range);
-Int sweepRangeEqual(sweepRange* sr1, sweepRange* sr2);
-
-/*given a set of simple polygons where the interior
- *is decided by left-hand principle,
- *return a range (sight) for each vertex. This is called
- *Trapezoidalization.
- */
-void sweepY(Int nVertices, directedLine **sortedVerteces, sweepRange** ret_ranges);
-
-
-directedLine* partitionY(directedLine *polygons, sampledLine **retSampledLines);
-
-void findDiagonals(Int total_num_edges, directedLine** sortedVertices, sweepRange** ranges, Int& num_diagonals, directedLine** diagonal_vertices);
-
-directedLine** DBGfindDiagonals(directedLine *polygons, Int& num_diagonals);
-
-#endif