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Diffstat (limited to 'basegfx/source/workbench/bezierclip.hxx')
-rw-r--r-- | basegfx/source/workbench/bezierclip.hxx | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/basegfx/source/workbench/bezierclip.hxx b/basegfx/source/workbench/bezierclip.hxx new file mode 100644 index 000000000000..06294d174847 --- /dev/null +++ b/basegfx/source/workbench/bezierclip.hxx @@ -0,0 +1,96 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org 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 version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +#ifndef BASEGFX_BEZIERCLIP_HXX +#define BASEGFX_BEZIERCLIP_HXX + +#include <vector> + +struct Point2D +{ + typedef double value_type; + Point2D( double _x, double _y ) : x(_x), y(_y) {} + Point2D() : x(), y() {} + double x; + double y; +}; + +struct Bezier +{ + Point2D p0; + Point2D p1; + Point2D p2; + Point2D p3; + + Point2D& operator[]( int i ) { return reinterpret_cast<Point2D*>(this)[i]; } + const Point2D& operator[]( int i ) const { return reinterpret_cast<const Point2D*>(this)[i]; } +}; + +struct FatLine +{ + // line L through p1 and p4 in normalized implicit form + double a; + double b; + double c; + + // the upper and lower distance from this line + double dMin; + double dMax; +}; + +template <typename DataType> DataType calcLineDistance( const DataType& a, + const DataType& b, + const DataType& c, + const DataType& x, + const DataType& y ) +{ + return a*x + b*y + c; +} + +typedef ::std::vector< Point2D > Polygon2D; + +/* little abs template */ +template <typename NumType> NumType absval( NumType x ) +{ + return x<0 ? -x : x; +} + +Polygon2D convexHull( const Polygon2D& rPoly ); + +// TODO: find proper epsilon here (try ::std::numeric_limits<NumType>::epsilon()?)! +#define DBL_EPSILON 1.0e-100 + +/* little approximate comparions */ +template <typename NumType> bool tolZero( NumType n ) { return fabs(n) < DBL_EPSILON; } +template <typename NumType> bool tolEqual( NumType n1, NumType n2 ) { return tolZero(n1-n2); } +template <typename NumType> bool tolLessEqual( NumType n1, NumType n2 ) { return tolEqual(n1,n2) || n1<n2; } +template <typename NumType> bool tolGreaterEqual( NumType n1, NumType n2 ) { return tolEqual(n1,n2) || n1>n2; } + +#endif /* BASEGFX_BEZIERCLIP_HXX */ + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |