628 lines
14 KiB
Plaintext
628 lines
14 KiB
Plaintext
/*
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* Copyright 2014 Haiku Inc. All rights reserved.
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* Distributed under the terms of the MIT License.
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*
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* Authors:
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* John Scipione, jscipione@gmail.com
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*
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* Corresponds to:
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* headers/os/interface/Rect.h hrev47289
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* src/kits/interface/Rect.cpp hrev47289
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*/
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/*!
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\file Rect.h
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\ingroup interface
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\ingroup libbe
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\brief BRect class definition.
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*/
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/*!
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\class BRect
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\ingroup interface
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\ingroup libbe
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\brief Defines a rectangular area aligned along pixel dimensions.
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BRect's are used throughout the Interface Kit to define the frames
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of windows, views, and bitmaps. BRect's are always oriented with
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completely vertical and horizontal lines, they cannot be rotated.
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A BRect must have a non-negative width and height to be valid, that is
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the left value must be greater than or equal to the right value and the
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bottom edge value be greater than or equal to the top value. You can test
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whether or not a BRect is valid by calling IsValid(). Nothing prevents
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you from creating an invalid BRect, but, using one to define an area can
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produce unpredictable results.
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A gotcha of using BRect's is that the starting point is 0, not 1, so
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in order to create a BRect with a 32x32 pixel area you write:
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\code
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BRect(0, 0, 31, 31);
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\endcode
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or if you have the width and height stored in a variable you subtract 1
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like this:
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\code
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BRect(0, 0, width - 1, height -1);
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\endcode
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*/
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/*!
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\var BRect::left
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\brief The value of the rectangle's left edge.
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*/
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/*!
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\var BRect::top
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\brief The value of the rectangle's top edge.
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*/
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/*!
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\var BRect::right
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\brief The value of the rectangle's right edge.
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*/
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/*!
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\var BRect::bottom
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\brief The value of the rectangle's bottom edge.
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*/
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/*!
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\fn inline BRect::BRect()
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\brief Creates an empty BRect object with dimensions (0, 0, -1, -1).
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These dimensions are invalid, use Set() to provide valid dimensions.
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\sa BRect::Set()
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\sa BRect::IsValid()
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*/
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/*!
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\fn inline BRect::BRect(float left, float top, float right, float bottom)
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\brief Creates a new BRect object with the given dimensions.
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\param left The left dimension.
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\param top The top dimension.
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\param right The right dimension.
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\param bottom The bottom dimension.
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*/
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/*!
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\fn inline BRect::BRect(const BRect& other)
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\brief Creates a new BRect object as a copy of \a other.
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\param other The BRect object to copy.
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*/
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/*!
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\fn inline BRect::BRect(BPoint leftTop, BPoint rightBottom)
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\brief Creates a new BRect object with its dimensions defined by the
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\a leftTop and \a rightBottom points.
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\param leftTop The position to set the left top corner to.
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\param rightBottom The position to set the bottom right corner to.
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*/
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/*!
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\fn inline BRect::BRect(BPoint leftTop, BSize size)
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\brief Creates a new BRect object with its dimensions defined by the
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\a leftTop point and \a size.
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\param leftTop The position of the left top corner.
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\param size The \a size of the rect defining its width and height.
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*/
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/*!
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\fn inline BRect::BRect(float side)
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\brief Creates a new BRect object setting the left and top dimensions
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to 0 and setting the right and bottom dimensions to \a side - 1.
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\param side The dimension to set the right and bottom sides.
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*/
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/*!
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\fn inline BRect& BRect::operator=(const BRect& other)
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\brief Creates a new BRect object as a copy of \a other by overloading
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the = operator.
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\param other The BRect object to copy.
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\return The newly created BRect object.
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*/
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/*!
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\fn inline bool BRect::IsValid() const
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\brief Returns whether or not the BRect is valid.
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A BRect is valid if its width and height are non-negative, that is its
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right value is greater than or equal to its left value and its bottom value
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is greater than or equal to its top value.
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\return \c true if the BRect is valid, \c false if the BRect is invalid.
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*/
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/*!
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\fn bool BRect::Intersects(BRect rect) const
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\brief Returns whether or not the BRect and \a rect intersect.
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\param rect The BRect to use to test for intersection.
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\return \c true if the rectangles intersect, \a false otherwise.
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*/
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/*!
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\fn bool BRect::Contains(BPoint point) const
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\brief Returns whether or not the BRect contains \a point.
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\param point The point to test.
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\return \c true if the BRect contains \a point, \c false otherwise.
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*/
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/*!
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\fn bool BRect::Contains(BRect rect) const
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\brief Returns whether or not the BRect wholly contains \a rect.
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\param rect The rectangle to test.
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\return \c true if the BRect contains \a rect, \c false otherwise.
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*/
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/*!
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\fn void BRect::PrintToStream() const
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\brief Prints the BRect dimensions to standard output.
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The format of the output looks like this:
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\verbatim
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BRect(l:%.1f, t:%.1f, r:%.1f, b:%.1f).
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\endverbatim
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*/
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/*!
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\fn inline int32 BRect::IntegerWidth() const
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\brief Returns The width of the rectangle rounded using
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ceil(\a right - \a left).
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\return The width of the rectangle as an int32.
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*/
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/*!
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\fn inline float BRect::Width() const
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\brief Returns the width of the rectangle.
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\return The width of the rectangle as a float.
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*/
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/*!
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\fn inline int32 BRect::IntegerHeight() const
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\brief Returns The height of the rectangle rounded using
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ceil(\a bottom - \a top).
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\return The height of the rectangle as an int32.
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*/
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/*!
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\fn inline float BRect::Height() const
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\brief Returns the height of the rectangle.
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\return The height of the rectangle as a float.
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*/
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/*!
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\fn inline BSize BRect::Size() const
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\brief Returns the dimensions of the BRect.
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\return The dimensions of the BRect as a BSize.
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*/
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/*!
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\fn inline void BRect::Set(float left, float top, float right,
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float bottom)
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\brief Sets the dimensions of a BRect.
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\param left The \a left dimension to set.
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\param top The \a top dimension to set.
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\param right The \a right dimension to set.
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\param bottom The \a bottom dimension to set.
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*/
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/*!
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\fn void BRect::SetLeftTop(const BPoint point)
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\brief Sets the left top \a point of the BRect.
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\param point The \a point to set.
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*/
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/*!
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\fn void BRect::SetRightBottom(const BPoint point)
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\brief Sets the right bottom \a point of the BRect.
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\param point The \a point to set.
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*/
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/*!
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\fn void BRect::SetLeftBottom(const BPoint point)
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\brief Sets the left bottom \a point of the BRect.
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\param point The \a point to set.
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*/
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/*!
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\fn void BRect::SetRightTop(const BPoint point)
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\brief Sets the right top \a point of the BRect.
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\param point The \a point to set.
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*/
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/*!
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\fn inline BPoint BRect::LeftTop() const
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\brief Returns the left top point of the BRect.
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\return The left top point as a BPoint.
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*/
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/*!
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\fn inline BPoint BRect::RightBottom() const
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\brief Returns the right bottom point of the BRect.
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\return The right bottom point as a BPoint.
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*/
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/*!
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\fn inline BPoint BRect::LeftBottom() const
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\brief Returns the left bottom point of the BRect.
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\return The left bottom point as a BPoint.
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*/
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/*!
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\fn inline BPoint BRect::RightTop() const
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\brief Returns the right top point of the BRect.
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\return The left right point as a BPoint.
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*/
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/*!
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\name Transformation methods
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Positive values make the rectangle smaller, negative values make it larger.
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The …Self() versions also return the transformed BRect when they are done.
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The …Copy() versions transform a copy without changing the original.
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*/
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//! @{
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/*!
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\fn void BRect::InsetBy(BPoint point)
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\brief Inset the BRect by the x and y coordinates of \a point.
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\param point The \a point to use to inset the BRect.
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*/
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/*!
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\fn void BRect::InsetBy(float dx, float dy)
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\brief Inset the BRect by \a dx units in the horizontal direction and
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\a dy units in the vertical direction.
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\param dx The horizontal distance to inset the BRect by.
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\param dy The vertical distance to inset the BRect by.
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*/
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/*!
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\fn BRect& BRect::InsetBySelf(BPoint point)
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\brief Like BRect::InsetBy() but returns the transformed BRect.
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\param point The \a point to use to inset the BRect.
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\return The transformed BRect.
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\sa BRect::InsetBy(BPoint point)
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*/
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/*!
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\fn BRect& BRect::InsetBySelf(float dx, float dy)
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\brief Like BRect::InsetBy() but returns the transformed BRect.
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\param dx The horizontal distance to inset the BRect by.
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\param dy The vertical distance to inset the BRect by.
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\return The transformed BRect.
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\sa BRect::InsetBy(float dx, float dy)
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*/
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/*!
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\fn BRect BRect::InsetByCopy(BPoint point) const
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\brief Like BRect::InsetBy() but returns a copy of the transformed BRect
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leaving the original unmodified.
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\param point The \a point to use to inset the BRect.
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\return A copy of the BRect after it has been transformed.
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\sa BRect::InsetBy(BPoint point)
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*/
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/*!
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\fn BRect BRect::InsetByCopy(float dx, float dy) const
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\brief Like BRect::InsetBy() but returns a copy of the transformed BRect
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leaving the original unmodified.
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\param dx The horizontal distance to inset the BRect by.
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\param dy The vertical distance to inset the BRect by.
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\return A copy of the BRect after it has been transformed.
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\sa BRect::InsetBy(float dx, float dy)
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*/
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//! @}
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/*!
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\name Translation methods
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Positive values move the rectangle right and down, negative values move the
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rectangle left and up.
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The …Self() versions also return the translated BRect when they are done.
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The …Copy() versions translate a copy without changing the original.
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*/
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//! @{
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/*!
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\fn void BRect::OffsetBy(BPoint point)
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\brief Moves the BRect horizontally by the x value of \a point and
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vertically by y value of \a point without changing the size
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of the rectangle.
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\param point The \a point to use to move the rectangle.
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*/
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/*!
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\fn void BRect::OffsetBy(float dx, float dy)
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\brief Moves the BRect horizontally by \a dx units and vertically by
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\a dy units point without changing the size of the rectangle.
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\param dx The number of units the move the rectangle vertically.
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\param dy The number of units the move the rectangle horizontally.
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*/
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/*!
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\fn BRect& BRect::OffsetBySelf(BPoint point)
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\brief Like BRect::OffsetBy() but returns the translated BRect.
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\param point The \a point to use to move the rectangle.
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\sa BRect::OffsetBy(BPoint point)
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*/
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/*!
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\fn BRect& BRect::OffsetBySelf(float dx, float dy)
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\brief Like BRect::OffsetBy() but returns the translated BRect.
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\param dx The number of units the move the rectangle vertically.
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\param dy The number of units the move the rectangle horizontally.
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\return The translated BRect.
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\sa BRect::OffsetBy(float dx, float dy)
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*/
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/*!
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\fn BRect BRect::OffsetByCopy(BPoint point) const
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\brief Like BRect::OffsetBy() but returns a copy of the translated
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BRect leaving the original unmodified.
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\param point The \a point to use to move the rectangle.
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\return A copy of the BRect after it has been translated.
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\sa BRect::OffsetBy(BPoint point)
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*/
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/*!
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\fn BRect BRect::OffsetByCopy(float dx, float dy) const
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\brief Like BRect::OffsetBy() but returns a copy of the translated
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BRect leaving the original unmodified.
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\param dx The number of units the move the rectangle vertically.
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\param dy The number of units the move the rectangle horizontally.
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\return A copy of the BRect after it has been translated.
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\sa BRect::OffsetBy(float dx, float dy)
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*/
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/*!
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\fn void BRect::OffsetTo(BPoint point)
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\brief Move the BRect to the location specified by \a point.
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\param point The location to move the BRect to.
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*/
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/*!
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\fn void BRect::OffsetTo(float x, float y)
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\brief Move the BRect to the point specified by the given \a x and \a y
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coordinates.
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\param x The vertical coordinate of the point to move the BRect to.
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\param y The horizontal coordinate of the point to move the BRect to.
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*/
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/*!
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\fn BRect& BRect::OffsetToSelf(BPoint point)
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\brief Like BRect::OffsetTo() but returns the translated BRect.
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\param point The \a point to use to move the rectangle.
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\return The translated BRect.
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\sa BRect::OffsetTo(BPoint point)
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*/
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/*!
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\fn BRect& BRect::OffsetToSelf(float x, float y)
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\brief Like BRect::OffsetTo() but returns the translated BRect.
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\param x The vertical coordinate of the point to move the BRect to.
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\param y The horizontal coordinate of the point to move the BRect to.
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\return The translated BRect.
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\sa BRect::OffsetTo(float x, float y)
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*/
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/*!
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\fn BRect BRect::OffsetToCopy(BPoint point) const
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\brief Like BRect::OffsetTo() but returns a copy of the translated
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BRect leaving the original unmodified.
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\param point The \a point to use to move the rectangle.
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\return A copy of the BRect after it has been translated.
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\sa BRect::OffsetTo(BPoint point)
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*/
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/*!
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\fn BRect BRect::OffsetToCopy(float x, float y) const
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\brief Like BRect::OffsetTo() but returns a copy of the translated
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BRect leaving the original unmodified.
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\param x The number of units the move the rectangle vertically.
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\param y The number of units the move the rectangle horizontally.
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\return A copy of the BRect after it has been translated.
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\sa BRect::OffsetTo(float x, float y)
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*/
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//! @}
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/*!
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\name Comparison methods
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*/
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//! @{
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/*!
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\fn bool BRect::operator==(BRect other) const
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\brief Returns whether or not two rectangles coincide exactly.
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\param other The BRect to compare with.
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\return \c true if the rectangles coincide, \c false otherwise.
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*/
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/*!
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\fn bool BRect::operator!=(BRect other) const
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\brief Returns whether or not two rectangles do NOT coincide exactly.
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\param other The BRect to compare with.
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\return \c true if the rectangles do NOT coincide, \c false otherwise.
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*/
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//! @}
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/*!
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\name Intersection and union methods
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*/
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//! @{
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/*!
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\fn BRect BRect::operator&(BRect other) const
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\brief Returns a new BRect that is the intersection of the BRect and
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\a other.
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The intersection of two rectangles is the area that they both share.
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\param other The BRect to take the intersection of.
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\return A new BRect that is the intersection of the BRect and \a other.
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*/
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/*!
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\fn BRect BRect::operator|(BRect other) const
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\brief Returns a new BRect that is the union of the BRect and \a other.
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The union of two rectangles is the area that encloses both rectangles.
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\param other The BRect to take the union of.
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\return A new BRect that is the union of the BRect and \a other.
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*/
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//! @}
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