---
name: "QwtDoubleRect"
section: "3"
platform: "linux"
package: "libqwt-doc"
version: "4.2.0-6"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/QwtDoubleRect"
---

# QwtDoubleRect(3)

## NAME

QwtDoubleRect -

## SYNOPSIS

## Detailed Description

The QwtDoubleRect class defines a size in double coordinates.

Definition at line 108 of file qwt\_double\_rect.h.

### Public Member Functions

**QwtDoubleRect** ()\
 **QwtDoubleRect** (double x1, double x2, double y1, double y2)\
 **QwtDoubleRect** (double x, double y, const **QwtDoubleSize** &)\
 bool **isNull** () const\
 bool **isEmpty** () const\
 bool **isValid** () const\
 **QwtDoubleRect** **normalize** () const\
 double **x1** () const\
 double **x2** () const\
 double **y1** () const\
 double **y2** () const\
 double & **rx1** ()\
 double & **rx2** ()\
 double & **ry1** ()\
 double & **ry2** ()\
 void **setX1** (double)\
 void **setX2** (double)\
 void **setY1** (double)\
 void **setY2** (double)\
 **QwtDoublePoint** **center** () const\
 void **moveX** (double x)\
 void **moveY** (double y)\
 void **move** (double x, double y)\
 void **moveBy** (double dx, double dy)\
 void **moveCenter** (const **QwtDoublePoint** &)\
 void **moveCenter** (double dx, double dy)\
 void **setRect** (double x1, double x2, double y1, double y2)\
 double **width** () const\
 double **height** () const\
 **QwtDoubleSize** **size** () const\
 void **setWidth** (double w)\
 void **setHeight** (double h)\
 void **setSize** (const **QwtDoubleSize** &)\
 **QwtDoubleRect** **operator\|** (const **QwtDoubleRect** &r) const\
 **QwtDoubleRect** **operator &** (const **QwtDoubleRect** &r) const\
 **QwtDoubleRect** & **operator\|=** (const **QwtDoubleRect** &r)\
 **QwtDoubleRect** & **operator &=** (const **QwtDoubleRect** &r)\
 bool **operator==** (const **QwtDoubleRect** &) const\
 bool **operator!=** (const **QwtDoubleRect** &) const\
 bool **contains** (const **QwtDoublePoint** &p, bool proper=FALSE) const\
 bool **contains** (double x, double y, bool proper=FALSE) const\
 bool **contains** (const **QwtDoubleRect** &r, bool proper=FALSE) const\
 **QwtDoubleRect** **unite** (const **QwtDoubleRect** &) const\
 **QwtDoubleRect** **intersect** (const **QwtDoubleRect** &) const\
 bool **intersects** (const **QwtDoubleRect** &) const\

## Constructor & Destructor Documentation

### QwtDoubleRect::QwtDoubleRect ()

Constructs an rectangle with all components set to 0.0.

Definition at line 295 of file qwt\_double\_rect.cpp.

Referenced by operator &(), and operator\|().

### QwtDoubleRect::QwtDoubleRect (double x1, double x2, double y1, double y2)

Constructs an rectangle with x1 to x2 as x-range and, y1 to y2 as y-range. Definition at line 308 of file qwt\_double\_rect.cpp.

### QwtDoubleRect::QwtDoubleRect (double x, double y, const QwtDoubleSize & size)

Constructs an rectangle with x1 to x1 + size.width() as x-range and, y1 to y1 + size.height() as y-range. Definition at line 322 of file qwt\_double\_rect.cpp.

## Member Function Documentation

### QwtDoublePoint QwtDoubleRect::center () const

Returns the center point of the rectangle.

Definition at line 478 of file qwt\_double\_rect.cpp.

Referenced by QwtPlotZoomer::end().

### bool QwtDoubleRect::contains (const QwtDoubleRect & other, bool proper = `FALSE`) const

Returns TRUE if the rectangle other is inside this rectangle; otherwise returns FALSE.

If proper is TRUE, this function returns TRUE only if other is entirely inside (not on the edge). Definition at line 521 of file qwt\_double\_rect.cpp.

References contains(), d\_x1, d\_x2, d\_y1, and d\_y2.

### bool QwtDoubleRect::contains (double x, double y, bool proper = `FALSE`) const

Returns TRUE if the point (x, y) is inside or on the edge of the rectangle; otherwise returns FALSE.

If proper is TRUE, this function returns TRUE only if p is inside (not on the edge). Definition at line 492 of file qwt\_double\_rect.cpp.

### bool QwtDoubleRect::contains (const QwtDoublePoint & p, bool proper = `FALSE`) const

Returns TRUE if the point p is inside or on the edge of the rectangle; otherwise returns FALSE.

If proper is TRUE, this function returns TRUE only if p is inside (not on the edge). Definition at line 508 of file qwt\_double\_rect.cpp.

References QwtDoublePoint::x(), and QwtDoublePoint::y().

Referenced by contains().

### double QwtDoubleRect::height () const

Returns the height.

Definition at line 397 of file qwt\_double\_rect.h.

Referenced by moveCenter(), moveY(), and size().

### QwtDoubleRect QwtDoubleRect::intersect (const QwtDoubleRect & other) const

Returns the intersection of this rectangle and rectangle other. r.intersect(s) is equivalent to r&s. Definition at line 400 of file qwt\_double\_rect.cpp.

### bool QwtDoubleRect::intersects (const QwtDoubleRect & other) const

Returns TRUE if this rectangle intersects with rectangle other; otherwise returns FALSE. Definition at line 410 of file qwt\_double\_rect.cpp.

References d\_x1, d\_x2, d\_y1, and d\_y2.

### bool QwtDoubleRect::isEmpty () const

Returns TRUE if the rectangle is a empty rectangle; otherwise returns FALSE.

A rect is null when **x1()** \>= **x2()** && **y1()** \>= **y2()**. Definition at line 302 of file qwt\_double\_rect.h.

### bool QwtDoubleRect::isNull () const

Returns TRUE if the rectangle is a null rectangle; otherwise returns FALSE.

A rect is null when **x1()** == **x2()** && **y1()** == **y2()**. Definition at line 291 of file qwt\_double\_rect.h.

### bool QwtDoubleRect::isValid () const

Returns TRUE if the rectangle is a valid rectangle; otherwise returns FALSE.

A rect is valid when **x1()** \<= **x2()** && **y1()** \<= **y2()**. Definition at line 313 of file qwt\_double\_rect.h.

Referenced by operator\|(), and QwtPlot::updateAxes().

### void QwtDoubleRect::move (double x, double y)

moves **x1()** to x and **y1()** to y, leaving the size unchanged

Definition at line 547 of file qwt\_double\_rect.cpp.

References moveX(), and moveY().

Referenced by moveCenter().

### void QwtDoubleRect::moveBy (double dx, double dy)

moves **x1()** by dx and **y1()** by dy. leaving the size unchanged

Definition at line 555 of file qwt\_double\_rect.cpp.

### void QwtDoubleRect::moveCenter (double dx, double dy)

moves the center to (x, y), leaving the size unchanged

Definition at line 572 of file qwt\_double\_rect.cpp.

References height(), move(), and width().

### void QwtDoubleRect::moveCenter (const QwtDoublePoint &)

moves the center to pos, leaving the size unchanged

Definition at line 565 of file qwt\_double\_rect.cpp.

References QwtDoublePoint::x(), and QwtDoublePoint::y().

Referenced by QwtPlotZoomer::end().

### void QwtDoubleRect::moveX (double x)

moves **x1()** to x, leaving the size unchanged

Definition at line 529 of file qwt\_double\_rect.cpp.

References width().

Referenced by move().

### void QwtDoubleRect::moveY (double y)

moves **y1()** to y, leaving the size unchanged

Definition at line 538 of file qwt\_double\_rect.cpp.

References height().

Referenced by move().

### QwtDoubleRect QwtDoubleRect::normalize () const

Returns a normalized rectangle, i.e. a rectangle that has a non-negative width and height.

It swaps x1 and x2 if **x1()** \> **x2()**, and swaps y1 and y2 if **y1()** \> **y2()**. Definition at line 359 of file qwt\_double\_rect.cpp.

References d\_x1, d\_x2, d\_y1, and d\_y2.

Referenced by QwtPlotZoomer::end(), and QwtPlotZoomer::zoom().

### QwtDoubleRect QwtDoubleRect::operator & (const QwtDoubleRect & other) const

Returns the intersection of this rectangle and rectangle other. Returns an empty rectangle if there is no intersection. Definition at line 454 of file qwt\_double\_rect.cpp.

References d\_x1, d\_x2, d\_y1, d\_y2, and QwtDoubleRect().

### QwtDoubleRect & QwtDoubleRect::operator &= (const QwtDoubleRect & r)

Intersects this rectangle with rectangle other.

Definition at line 470 of file qwt\_double\_rect.cpp.

### bool QwtDoubleRect::operator!= (const QwtDoubleRect &) const

Returns TRUE if this rect and other are different; otherwise returns FALSE.

Definition at line 426 of file qwt\_double\_rect.cpp.

References operator==().

### bool QwtDoubleRect::operator== (const QwtDoubleRect &) const

Returns TRUE if this rect and other are equal; otherwise returns FALSE.

Definition at line 418 of file qwt\_double\_rect.cpp.

References d\_x1, d\_x2, d\_y1, and d\_y2.

Referenced by operator!=().

### QwtDoubleRect QwtDoubleRect::operator\| (const QwtDoubleRect & other) const

Returns the bounding rectangle of this rectangle and rectangle other. The bounding rectangle of a nonempty rectangle and an empty or invalid rectangle is defined to be the nonempty rectangle. Definition at line 437 of file qwt\_double\_rect.cpp.

References d\_x1, d\_x2, d\_y1, d\_y2, isValid(), and QwtDoubleRect().

### QwtDoubleRect & QwtDoubleRect::operator\|= (const QwtDoubleRect & r)

Unites this rectangle with rectangle other.

Definition at line 462 of file qwt\_double\_rect.cpp.

### double & QwtDoubleRect::rx1 ()

Returns a reference to x1.

Definition at line 343 of file qwt\_double\_rect.h.

### double & QwtDoubleRect::rx2 ()

Returns a reference to x2.

Definition at line 349 of file qwt\_double\_rect.h.

### double & QwtDoubleRect::ry1 ()

Returns a reference to y1.

Definition at line 355 of file qwt\_double\_rect.h.

### double & QwtDoubleRect::ry2 ()

Returns a reference to y2.

Definition at line 361 of file qwt\_double\_rect.h.

### void QwtDoubleRect::setHeight (double h)

Set the height, by y2 = y1 + h;.

Definition at line 415 of file qwt\_double\_rect.h.

Referenced by setSize().

### void QwtDoubleRect::setRect (double x1, double x2, double y1, double y2)

Set the x-range from x1 to x2 and the y-range from y1 to y2. Definition at line 333 of file qwt\_double\_rect.cpp.

### void QwtDoubleRect::setSize (const QwtDoubleSize & size)

Sets the size of the rectangle to size. Changes x2 and y2 only. Definition at line 346 of file qwt\_double\_rect.cpp.

References QwtDoubleSize::height(), setHeight(), setWidth(), and QwtDoubleSize::width().

Referenced by QwtPlotZoomer::end().

### void QwtDoubleRect::setWidth (double w)

Set the width, by x2 = x1 + w;.

Definition at line 409 of file qwt\_double\_rect.h.

Referenced by setSize().

### void QwtDoubleRect::setX1 (double)

Set x1.

Definition at line 367 of file qwt\_double\_rect.h.

### void QwtDoubleRect::setX2 (double)

Set x2.

Definition at line 373 of file qwt\_double\_rect.h.

### void QwtDoubleRect::setY1 (double)

Set y1.

Definition at line 379 of file qwt\_double\_rect.h.

### void QwtDoubleRect::setY2 (double)

Set y2.

Definition at line 385 of file qwt\_double\_rect.h.

### QwtDoubleSize QwtDoubleRect::size () const

Returns the size.

Definition at line 403 of file qwt\_double\_rect.h.

References height(), and width().

Referenced by QwtPlotZoomer::end().

### QwtDoubleRect QwtDoubleRect::unite (const QwtDoubleRect & other) const

Returns the bounding rectangle of this rectangle and rectangle other. r.unite(s) is equivalent to r\|s. Definition at line 390 of file qwt\_double\_rect.cpp.

### double QwtDoubleRect::width () const

Returns the width.

Definition at line 391 of file qwt\_double\_rect.h.

Referenced by moveCenter(), moveX(), and size().

### double QwtDoubleRect::x1 () const

Returns x1.

Definition at line 319 of file qwt\_double\_rect.h.

Referenced by QwtPlotZoomer::move(), QwtPlotZoomer::moveBy(), QwtPlotZoomer::rescale(), QwtPlotPicker::transform(), and QwtPlot::updateAxes().

### double QwtDoubleRect::x2 () const

Returns x2.

Definition at line 325 of file qwt\_double\_rect.h.

Referenced by QwtPlotZoomer::rescale(), QwtPlotPicker::transform(), and QwtPlot::updateAxes().

### double QwtDoubleRect::y1 () const

Returns y1.

Definition at line 331 of file qwt\_double\_rect.h.

Referenced by QwtPlotZoomer::move(), QwtPlotZoomer::moveBy(), QwtPlotZoomer::rescale(), QwtPlotPicker::transform(), and QwtPlot::updateAxes().

### double QwtDoubleRect::y2 () const

Returns y2.

Definition at line 337 of file qwt\_double\_rect.h.

Referenced by QwtPlotZoomer::rescale(), QwtPlotPicker::transform(), and QwtPlot::updateAxes().

## Author

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