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Diffstat (limited to 'include/basegfx/utils/tools.hxx')
| -rw-r--r-- | include/basegfx/utils/tools.hxx | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/include/basegfx/utils/tools.hxx b/include/basegfx/utils/tools.hxx new file mode 100644 index 000000000..f8fc61999 --- /dev/null +++ b/include/basegfx/utils/tools.hxx @@ -0,0 +1,124 @@ +/* -*- 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 <sal/types.h> +#include <basegfx/basegfxdllapi.h> + +namespace basegfx +{ + class B2DPoint; + class B2DRange; + class B2DPolyPolygon; +} + +namespace basegfx::utils +{ + /** 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 ); + + /** Creates polypolygon with the given number as seven-segment + digits + + @param fVal + Value to convert + + @param nTotalDigits + Total number of digits to display. If less is needed for + given number, fill space with blanks. + + @param nDecPlaces + Decimal places to show. When 0, display as integer. When + negative, fill given number of before-the-decimal point + with zero. + + @param bLitSegments + When true, return a polygon containing the segments that + are 'lit' for the given number. Return un-lit segments + otherwise. + */ + BASEGFX_DLLPUBLIC B2DPolyPolygon number2PolyPolygon(double fVal, + sal_Int32 nTotalDigits, + sal_Int32 nDecPlaces, + bool bLitSegments=true); +} + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |