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Diffstat (limited to 'include/basegfx/polygon/b2dtrapezoid.hxx')
-rw-r--r-- | include/basegfx/polygon/b2dtrapezoid.hxx | 108 |
1 files changed, 108 insertions, 0 deletions
diff --git a/include/basegfx/polygon/b2dtrapezoid.hxx b/include/basegfx/polygon/b2dtrapezoid.hxx new file mode 100644 index 0000000000..aeed7148e2 --- /dev/null +++ b/include/basegfx/polygon/b2dtrapezoid.hxx @@ -0,0 +1,108 @@ +/* -*- 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 <config_options.h> +#include <basegfx/polygon/b2dpolygon.hxx> +#include <vector> +#include <basegfx/basegfxdllapi.h> + + +namespace basegfx { class B2DPolyPolygon; } +namespace basegfx { class B2DPoint; } + +namespace basegfx +{ + // class to hold a single trapezoid + class UNLESS_MERGELIBS(BASEGFX_DLLPUBLIC) B2DTrapezoid + { + private: + // Geometry data. YValues are down-oriented, this means bottom should + // be bigger than top to be below it. The constructor implementation + // guarantees: + + // - mfBottomY >= mfTopY + // - mfTopXRight >= mfTopXLeft + // - mfBottomXRight >= mfBottomXLeft + double mfTopXLeft; + double mfTopXRight; + double mfTopY; + double mfBottomXLeft; + double mfBottomXRight; + double mfBottomY; + + public: + // constructor + B2DTrapezoid( + const double& rfTopXLeft, + const double& rfTopXRight, + const double& rfTopY, + const double& rfBottomXLeft, + const double& rfBottomXRight, + const double& rfBottomY); + + // data read access + const double& getTopXLeft() const { return mfTopXLeft; } + const double& getTopXRight() const { return mfTopXRight; } + const double& getTopY() const { return mfTopY; } + const double& getBottomXLeft() const { return mfBottomXLeft; } + const double& getBottomXRight() const { return mfBottomXRight; } + const double& getBottomY() const { return mfBottomY; } + + // convenience method to get content as Polygon + B2DPolygon getB2DPolygon() const; + }; + + typedef ::std::vector< B2DTrapezoid > B2DTrapezoidVector; + +} // end of namespace basegfx + + +namespace basegfx::utils +{ + // convert SourcePolyPolygon to trapezoids. The trapezoids will be appended to + // ro_Result. ro_Result will not be cleared. If SourcePolyPolygon contains curves, + // it's default AdaptiveSubdivision will be used. + // CAUTION: Trapezoids are orientation-dependent in the sense that the upper and lower + // lines have to be parallel to the X-Axis, thus this subdivision is NOT simply usable + // for primitive decompositions. To use it, the shear and rotate parts of the + // involved transformations HAVE to be taken into account. + BASEGFX_DLLPUBLIC void trapezoidSubdivide( + B2DTrapezoidVector& ro_Result, + const B2DPolyPolygon& rSourcePolyPolygon); + + // directly create trapezoids from given edge. Depending on the given geometry, + // none up to three trapezoids will be created + void createLineTrapezoidFromEdge( + B2DTrapezoidVector& ro_Result, + const B2DPoint& rPointA, + const B2DPoint& rPointB, + double fLineWidth); + + // create trapezoids for all edges of the given polygon. The closed state of + // the polygon is taken into account. If curves are contained, the default + // AdaptiveSubdivision will be used. + void createLineTrapezoidFromB2DPolygon( + B2DTrapezoidVector& ro_Result, + const B2DPolygon& rPolygon, + double fLineWidth); +} // end of namespace basegfx::utils + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |