---
name: "QwtPoint3D"
section: "3"
platform: "linux"
package: "libqwt-doc"
version: "6.1.4-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/QwtPoint3D"
---

# QwtPoint3D(3)

QwtPoint3D class defines a 3D point in double coordinates.

## NAME

QwtPoint3D - **QwtPoint3D** class defines a 3D point in double coordinates.

## SYNOPSIS

`#include <qwt_point_3d.h>`

### Public Member Functions

**QwtPoint3D** ()\
 **QwtPoint3D** (double **x**, double **y**, double **z**)\
 Constructs a point with coordinates specified by x, y and z.  **QwtPoint3D** (const **QwtPoint3D** &)\
 **QwtPoint3D** (const QPointF &)\
 bool **isNull** () const\
 double **x** () const\
 double **y** () const\
 double **z** () const\
 double & **rx** ()\
 double & **ry** ()\
 double & **rz** ()\
 void **setX** (double **x**)\
 Sets the x-coordinate of the point to the value specified by x.  void **setY** (double **y**)\
 Sets the y-coordinate of the point to the value specified by y.  void **setZ** (double **y**)\
 Sets the z-coordinate of the point to the value specified by z.  QPointF **toPoint** () const\
 bool **operator==** (const **QwtPoint3D** &) const\
 bool **operator!=** (const **QwtPoint3D** &) const\

## Detailed Description

**QwtPoint3D** class defines a 3D point in double coordinates.

## Constructor & Destructor Documentation

### QwtPoint3D::QwtPoint3D ()` [inline]`

Constructs a null point.

**See also:**

**isNull()**

### QwtPoint3D::QwtPoint3D (const QwtPoint3D & other)` [inline]`

Copy constructor. Constructs a point using the values of the point specified.

### QwtPoint3D::QwtPoint3D (const QPointF & other)` [inline]`

Constructs a point with x and y coordinates from a 2D point, and a z coordinate of 0.

## Member Function Documentation

### bool QwtPoint3D::isNull () const` [inline]`

**Returns:**

True if the point is null; otherwise returns false.

A point is considered to be null if x, y and z-coordinates are equal to zero.

### bool QwtPoint3D::operator!= (const QwtPoint3D & other) const` [inline]`

**Returns:**

True if this rect and other are different; otherwise returns false.

### bool QwtPoint3D::operator== (const QwtPoint3D & other) const` [inline]`

**Returns:**

True, if this point and other are equal; otherwise returns false.

### double & QwtPoint3D::rx ()` [inline]`

**Returns:**

A reference to the x-coordinate of the point.

### double & QwtPoint3D::ry ()` [inline]`

**Returns:**

A reference to the y-coordinate of the point.

### double & QwtPoint3D::rz ()` [inline]`

**Returns:**

A reference to the z-coordinate of the point.

### QPointF QwtPoint3D::toPoint () const` [inline]`

**Returns:**

2D point, where the z coordinate is dropped.

### double QwtPoint3D::x () const` [inline]`

**Returns:**

The x-coordinate of the point.

### double QwtPoint3D::y () const` [inline]`

**Returns:**

The y-coordinate of the point.

### double QwtPoint3D::z () const` [inline]`

**Returns:**

The z-coordinate of the point.

## Author

Generated automatically by Doxygen for Qwt User's Guide from the source code.