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-/* -*- 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 _BGFX_TOOLS_TOOLS_HXX
-#define _BGFX_TOOLS_TOOLS_HXX
-
-#include <sal/types.h>
-#include <basegfx/basegfxdllapi.h>
-
-namespace basegfx
-{
- class B2DPoint;
- class B2DRange;
-
- namespace tools
- {
- /** Liang-Barsky 2D line clipping algorithm
-
- This function clips a line given by two points against the
- given rectangle. The resulting line is returned in the
- given points.
-
- @param io_rStart
- Start point of the line. On return, contains the clipped
- start point.
-
- @param io_rEnd
- End point of the line. On return, contains the clipped
- end point.
-
- @param rClipRect
- The rectangle to clip against
-
- @return true, when at least part of the line is visible
- after the clip, false otherwise
- */
- BASEGFX_DLLPUBLIC bool liangBarskyClip2D( ::basegfx::B2DPoint& io_rStart,
- ::basegfx::B2DPoint& io_rEnd,
- const ::basegfx::B2DRange& rClipRect );
-
- /** Expand given parallelogram, such that it extends beyond
- bound rect in a given direction.
-
- This method is useful when e.g. generating one-dimensional
- gradients, such as linear or axial gradients: those
- gradients vary only in one direction, the other has
- constant color. Most of the time, those gradients extends
- infinitely in the direction with the constant color, but
- practically, one always has a limiting bound rect into
- which the gradient is painted. The method at hand now
- extends a given parallelogram (e.g. the transformed
- bounding box of a gradient) virtually into infinity to the
- top and to the bottom (i.e. normal to the line io_rLeftTop
- io_rRightTop), such that the given rectangle is guaranteed
- to be covered in that direction.
-
- @attention There might be some peculiarities with this
- method, that might limit its usage to the described
- gradients. One of them is the fact that when determining
- how far the parallelogram has to be extended to the top or
- the bottom, the upper and lower border are assumed to be
- infinite lines.
-
- @param io_rLeftTop
- Left, top edge of the parallelogramm. Note that this need
- not be the left, top edge geometrically, it's just used
- when determining the extension direction. Thus, it's
- perfectly legal to affine-transform a rectangle, and given
- the transformed point here. On method return, this
- parameter will contain the adapted output.
-
- @param io_rLeftBottom
- Left, bottom edge of the parallelogramm. Note that this need
- not be the left, bottom edge geometrically, it's just used
- when determining the extension direction. Thus, it's
- perfectly legal to affine-transform a rectangle, and given
- the transformed point here. On method return, this
- parameter will contain the adapted output.
-
- @param io_rRightTop
- Right, top edge of the parallelogramm. Note that this need
- not be the right, top edge geometrically, it's just used
- when determining the extension direction. Thus, it's
- perfectly legal to affine-transform a rectangle, and given
- the transformed point here. On method return, this
- parameter will contain the adapted output.
-
- @param io_rRightBottom
- Right, bottom edge of the parallelogramm. Note that this need
- not be the right, bottom edge geometrically, it's just used
- when determining the extension direction. Thus, it's
- perfectly legal to affine-transform a rectangle, and given
- the transformed point here. On method return, this
- parameter will contain the adapted output.
-
- @param rFitTarget
- The rectangle to fit the parallelogram into.
- */
- BASEGFX_DLLPUBLIC void infiniteLineFromParallelogram( ::basegfx::B2DPoint& io_rLeftTop,
- ::basegfx::B2DPoint& io_rLeftBottom,
- ::basegfx::B2DPoint& io_rRightTop,
- ::basegfx::B2DPoint& io_rRightBottom,
- const ::basegfx::B2DRange& rFitTarget );
-
- }
-}
-
-#endif /* _BGFX_TOOLS_TOOLS_HXX */
-
-/* vim:set shiftwidth=4 softtabstop=4 expandtab: */