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authorKurt Zenker <kz@openoffice.org>2005-01-13 17:01:14 +0000
committerKurt Zenker <kz@openoffice.org>2005-01-13 17:01:14 +0000
commit688e99f1c76932530569cc170f5119663ffeda95 (patch)
tree6f3c5a65c74e4bf0ec878ae550b8461eb50ca3e6 /basegfx/source/tools
parenta2a1019cb8585a2b5dbadf82087867917e3deb3d (diff)
INTEGRATION: CWS presperf01 (1.1.2); FILE ADDED
2004/12/17 22:35:32 thb 1.1.2.1: #i36093# Initial revision
Diffstat (limited to 'basegfx/source/tools')
-rw-r--r--basegfx/source/tools/tools.cxx155
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diff --git a/basegfx/source/tools/tools.cxx b/basegfx/source/tools/tools.cxx
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+/*************************************************************************
+ *
+ * $RCSfile: tools.cxx,v $
+ *
+ * $Revision: 1.2 $
+ *
+ * last change: $Author: kz $ $Date: 2005-01-13 18:01:14 $
+ *
+ * The Contents of this file are made available subject to the terms of
+ * either of the following licenses
+ *
+ * - GNU Lesser General Public License Version 2.1
+ * - Sun Industry Standards Source License Version 1.1
+ *
+ * Sun Microsystems Inc., October, 2000
+ *
+ * GNU Lesser General Public License Version 2.1
+ * =============================================
+ * Copyright 2000 by Sun Microsystems, Inc.
+ * 901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ * 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 library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ *
+ *
+ * Sun Industry Standards Source License Version 1.1
+ * =================================================
+ * The contents of this file are subject to the Sun Industry Standards
+ * Source License Version 1.1 (the "License"); You may not use this file
+ * except in compliance with the License. You may obtain a copy of the
+ * License at http://www.openoffice.org/license.html.
+ *
+ * Software provided under this License is provided on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+ * WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
+ * MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
+ * See the License for the specific provisions governing your rights and
+ * obligations concerning the Software.
+ *
+ * The Initial Developer of the Original Code is: Sun Microsystems, Inc.
+ *
+ * Copyright: 2000 by Sun Microsystems, Inc.
+ *
+ * All Rights Reserved.
+ *
+ * Contributor(s): _______________________________________
+ *
+ *
+ ************************************************************************/
+
+#include "basegfx/tools/tools.hxx"
+#include "basegfx/range/b2drange.hxx"
+
+#include <algorithm>
+
+
+namespace basegfx
+{
+ namespace tools
+ {
+ namespace
+ {
+ inline double distance( const double& nX,
+ const double& nY,
+ const ::basegfx::B2DVector& rNormal,
+ const double& nC )
+ {
+ return nX*rNormal.getX() + nY*rNormal.getY() - nC;
+ }
+
+ void moveLineOutsideRect( ::basegfx::B2DPoint& io_rStart,
+ ::basegfx::B2DPoint& io_rEnd,
+ const ::basegfx::B2DVector& rMoveDirection,
+ const ::basegfx::B2DRange& rFitTarget )
+ {
+ // calc c for normal line form equation n x - c = 0
+ const double nC( rMoveDirection.scalar( io_rStart ) );
+
+ // calc maximum orthogonal distance for all four bound
+ // rect corners to the line
+ const double nMaxDistance( ::std::max(
+ 0.0,
+ ::std::max(
+ distance(rFitTarget.getMinX(),
+ rFitTarget.getMinY(),
+ rMoveDirection,
+ nC),
+ ::std::max(
+ distance(rFitTarget.getMinX(),
+ rFitTarget.getMaxY(),
+ rMoveDirection,
+ nC),
+ ::std::max(
+ distance(rFitTarget.getMaxX(),
+ rFitTarget.getMinY(),
+ rMoveDirection,
+ nC),
+ distance(rFitTarget.getMaxX(),
+ rFitTarget.getMaxY(),
+ rMoveDirection,
+ nC) ) ) ) ) );
+
+ // now move line points, such that the bound rect
+ // points are all either 'on' or on the negative side
+ // of the half-plane
+ io_rStart += nMaxDistance*rMoveDirection;
+ io_rEnd += nMaxDistance*rMoveDirection;
+ }
+ }
+
+ void infiniteLineFromParallelogram( ::basegfx::B2DPoint& io_rLeftTop,
+ ::basegfx::B2DPoint& io_rLeftBottom,
+ ::basegfx::B2DPoint& io_rRightTop,
+ ::basegfx::B2DPoint& io_rRightBottom,
+ const ::basegfx::B2DRange& rFitTarget )
+ {
+ // For the top and bottom border line of the
+ // parallelogram, we determine the distance to all four
+ // corner points of the bound rect (tl, tr, bl, br). When
+ // using the unit normal form for lines (n x - c = 0), and
+ // choosing n to point 'outwards' the parallelogram, then
+ // all bound rect corner points having positive distance
+ // to the line lie outside the extended gradient rect, and
+ // thus, the corresponding border line must be moved the
+ // maximum distance outwards.
+
+ // don't use the top and bottom border line direction, and
+ // calculate the normal from them. Instead, use the
+ // vertical lines (lt - lb or rt - rb), as they more
+ // faithfully represent the direction of the
+ // to-be-generated infinite line
+ ::basegfx::B2DVector aDirectionVertical( io_rLeftTop - io_rLeftBottom );
+ aDirectionVertical.normalize();
+
+ const ::basegfx::B2DVector aNormalTop( aDirectionVertical );
+ const ::basegfx::B2DVector aNormalBottom( -aDirectionVertical );
+
+ // now extend parallelogram, such that the bound rect
+ // point are included
+ moveLineOutsideRect( io_rLeftTop, io_rRightTop, aNormalTop, rFitTarget );
+ moveLineOutsideRect( io_rLeftBottom, io_rRightBottom, aNormalBottom, rFitTarget );
+ }
+ }
+}