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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:06:44 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 09:06:44 +0000 |
commit | ed5640d8b587fbcfed7dd7967f3de04b37a76f26 (patch) | |
tree | 7a5f7c6c9d02226d7471cb3cc8fbbf631b415303 /basegfx/source/workbench/bezierclip.hxx | |
parent | Initial commit. (diff) | |
download | libreoffice-upstream.tar.xz libreoffice-upstream.zip |
Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'basegfx/source/workbench/bezierclip.hxx')
-rw-r--r-- | basegfx/source/workbench/bezierclip.hxx | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/basegfx/source/workbench/bezierclip.hxx b/basegfx/source/workbench/bezierclip.hxx new file mode 100644 index 000000000..54cceb414 --- /dev/null +++ b/basegfx/source/workbench/bezierclip.hxx @@ -0,0 +1,84 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 . + */ + +#pragma once + +#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()?)! +constexpr auto DBL_EPSILON = 1.0e-100; + +/* little approximate comparisons */ +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; } + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |