gecko-dev/gfx/public/nsRect.h

137 lines
5.4 KiB
C

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (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.mozilla.org/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
*/
#ifndef NSRECT_H
#define NSRECT_H
#include <stdio.h>
#include "nsCoord.h"
#include "nsPoint.h"
#include "nsSize.h"
#include "nsMargin.h"
#include "nsUnitConversion.h"
struct NS_GFX nsRect {
nscoord x, y;
nscoord width, height;
// Constructors
nsRect() : x(0), y(0), width(0), height(0) {}
nsRect(const nsRect& aRect) {*this = aRect;}
nsRect(const nsPoint& aOrigin, const nsSize &aSize) {x = aOrigin.x; y = aOrigin.y;
width = aSize.width; height = aSize.height;}
nsRect(nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight) {x = aX; y = aY;
width = aWidth; height = aHeight;}
// Emptiness. An empty rect is one that has no area, i.e. its width or height
// is <= 0
PRBool IsEmpty() const {
return (PRBool) ((width <= 0) || (height <= 0));
}
void Empty() {width = height = 0;}
// Containment
PRBool Contains(const nsRect& aRect) const;
PRBool Contains(nscoord aX, nscoord aY) const;
PRBool Contains(const nsPoint& aPoint) const {return Contains(aPoint.x, aPoint.y);}
// Intersection. Returns TRUE if the receiver overlaps aRect and
// FALSE otherwise
PRBool Intersects(const nsRect& aRect) const;
// Computes the area in which aRect1 and aRect2 overlap, and fills 'this' with
// the result. Returns FALSE if the rectangles don't intersect, and sets 'this'
// rect to be an empty rect.
//
// 'this' can be the same object as either aRect1 or aRect2
PRBool IntersectRect(const nsRect& aRect1, const nsRect& aRect2);
// Computes the smallest rectangle that contains both aRect1 and aRect2 and
// fills 'this' with the result. Returns FALSE and sets 'this' rect to be an
// empty rect if both aRect1 and aRect2 are empty
//
// 'this' can be the same object as either aRect1 or aRect2
PRBool UnionRect(const nsRect& aRect1, const nsRect& aRect2);
// Accessors
void SetRect(nscoord aX, nscoord aY, nscoord aWidth, nscoord aHeight) {
x = aX; y = aY; width = aWidth; height = aHeight;
}
void MoveTo(nscoord aX, nscoord aY) {x = aX; y = aY;}
void MoveTo(const nsPoint& aPoint) {x = aPoint.x; y = aPoint.y;}
void MoveBy(nscoord aDx, nscoord aDy) {x += aDx; y += aDy;}
void SizeTo(nscoord aWidth, nscoord aHeight) {width = aWidth; height = aHeight;}
void SizeTo(const nsSize& aSize) {SizeTo(aSize.width, aSize.height);}
void SizeBy(nscoord aDeltaWidth, nscoord aDeltaHeight) {width += aDeltaWidth;
height += aDeltaHeight;}
// Inflate the rect by the specified width/height or margin
void Inflate(nscoord aDx, nscoord aDy);
void Inflate(const nsSize& aSize) {Inflate(aSize.width, aSize.height);}
void Inflate(const nsMargin& aMargin);
// Deflate the rect by the specified width/height or margin
void Deflate(nscoord aDx, nscoord aDy);
void Deflate(const nsSize& aSize) {Deflate(aSize.width, aSize.height);}
void Deflate(const nsMargin& aMargin);
// Overloaded operators. Note that '=' isn't defined so we'll get the
// compiler generated default assignment operator.
PRBool operator==(const nsRect& aRect) const {
return (PRBool) ((IsEmpty() && aRect.IsEmpty()) ||
((x == aRect.x) && (y == aRect.y) &&
(width == aRect.width) && (height == aRect.height)));
}
PRBool operator!=(const nsRect& aRect) const {
return (PRBool) !operator==(aRect);
}
nsRect operator+(const nsRect& aRect) const {
return nsRect(x + aRect.x, y + aRect.y,
width + aRect.width, height + aRect.height);
}
nsRect operator-(const nsRect& aRect) const {
return nsRect(x - aRect.x, y - aRect.y,
width - aRect.width, height - aRect.height);
}
nsRect& operator+=(const nsPoint& aPoint) {x += aPoint.x; y += aPoint.y; return *this;}
nsRect& operator-=(const nsPoint& aPoint) {x -= aPoint.x; y -= aPoint.y; return *this;}
nsRect& operator*=(const float aScale) {x = NSToCoordRound(x * aScale);
y = NSToCoordRound(y * aScale);
width = NSToCoordRound(width * aScale);
height = NSToCoordRound(height * aScale);
return *this;}
nsRect& ScaleRoundOut(const float aScale);
nsRect& ScaleRoundIn(const float aScale);
// Helper methods for computing the extents
nscoord XMost() const {return x + width;}
nscoord YMost() const {return y + height;}
};
// Diagnostics
extern NS_GFX FILE* operator<<(FILE* out, const nsRect& rect);
#endif /* NSRECT_H */