The QVector2D class represents a vector or vertex in 2D space. More...
| Header: | #include <QVector2D> |
| qmake: | QT += gui |
| Since: | Qt 4.6 |
| QVector2D() | |
| QVector2D(float xpos, float ypos) | |
| QVector2D(const QPoint &point) | |
| QVector2D(const QPointF &point) | |
| QVector2D(const QVector3D &vector) | |
| QVector2D(const QVector4D &vector) | |
| float | distanceToLine(const QVector2D &point, const QVector2D &direction) const |
| float | distanceToPoint(const QVector2D &point) const |
| bool | isNull() const |
| float | length() const |
| float | lengthSquared() const |
| void | normalize() |
| QVector2D | normalized() const |
| void | setX(float x) |
| void | setY(float y) |
| QPoint | toPoint() const |
| QPointF | toPointF() const |
| QVector3D | toVector3D() const |
| QVector4D | toVector4D() const |
| float | x() const |
| float | y() const |
| QVariant | operator QVariant() const |
| QVector2D & | operator*=(float factor) |
| QVector2D & | operator*=(const QVector2D &vector) |
| QVector2D & | operator+=(const QVector2D &vector) |
| QVector2D & | operator-=(const QVector2D &vector) |
| QVector2D & | operator/=(float divisor) |
| QVector2D & | operator/=(const QVector2D &vector) |
| float & | operator[](int i) |
| float | operator[](int i) const |
| float | dotProduct(const QVector2D &v1, const QVector2D &v2) |
| bool | qFuzzyCompare(const QVector2D &v1, const QVector2D &v2) |
| bool | operator!=(const QVector2D &v1, const QVector2D &v2) |
| const QVector2D | operator*(float factor, const QVector2D &vector) |
| const QVector2D | operator*(const QVector2D &vector, float factor) |
| const QVector2D | operator*(const QVector2D &v1, const QVector2D &v2) |
| const QVector2D | operator+(const QVector2D &v1, const QVector2D &v2) |
| const QVector2D | operator-(const QVector2D &v1, const QVector2D &v2) |
| const QVector2D | operator-(const QVector2D &vector) |
| const QVector2D | operator/(const QVector2D &vector, float divisor) |
| const QVector2D | operator/(const QVector2D &vector, const QVector2D &divisor) |
| QDataStream & | operator<<(QDataStream &stream, const QVector2D &vector) |
| bool | operator==(const QVector2D &v1, const QVector2D &v2) |
| QDataStream & | operator>>(QDataStream &stream, QVector2D &vector) |
The QVector2D class represents a vector or vertex in 2D space.
The QVector2D class can also be used to represent vertices in 2D space. We therefore do not need to provide a separate vertex class.
See also QVector3D, QVector4D, and QQuaternion.
Constructs a null vector, i.e. with coordinates (0, 0).
Constructs a vector with coordinates (xpos, ypos).
Constructs a vector with x and y coordinates from a 2D point.
Constructs a vector with x and y coordinates from a 2D point.
Constructs a vector with x and y coordinates from a 3D vector. The z coordinate of vector is dropped.
See also toVector3D().
Constructs a vector with x and y coordinates from a 3D vector. The z and w coordinates of vector are dropped.
See also toVector4D().
Returns the distance that this vertex is from a line defined by point and the unit vector direction.
If direction is a null vector, then it does not define a line. In that case, the distance from point to this vertex is returned.
This function was introduced in Qt 5.1.
See also distanceToPoint().
Returns the distance from this vertex to a point defined by the vertex point.
This function was introduced in Qt 5.1.
See also distanceToLine().
[static] float QVector2D::dotProduct(const QVector2D &v1, const QVector2D &v2)Returns the dot product of v1 and v2.
Returns true if the x and y coordinates are set to 0.0, otherwise returns false.
Returns the length of the vector from the origin.
See also lengthSquared() and normalized().
Returns the squared length of the vector from the origin. This is equivalent to the dot product of the vector with itself.
See also length() and dotProduct().
Normalizes the currect vector in place. Nothing happens if this vector is a null vector or the length of the vector is very close to 1.
See also length() and normalized().
Returns the normalized unit vector form of this vector.
If this vector is null, then a null vector is returned. If the length of the vector is very close to 1, then the vector will be returned as-is. Otherwise the normalized form of the vector of length 1 will be returned.
See also length() and normalize().
Sets the x coordinate of this point to the given x coordinate.
Sets the y coordinate of this point to the given y coordinate.
Returns the QPoint form of this 2D vector.
See also toPointF() and toVector3D().
Returns the QPointF form of this 2D vector.
See also toPoint() and toVector3D().
Returns the 3D form of this 2D vector, with the z coordinate set to zero.
See also toVector4D() and toPoint().
Returns the 4D form of this 2D vector, with the z and w coordinates set to zero.
See also toVector3D() and toPoint().
Returns the x coordinate of this point.
Returns the y coordinate of this point.
Returns the 2D vector as a QVariant.
Multiplies this vector's coordinates by the given factor, and returns a reference to this vector.
See also operator/=().
Multiplies the components of this vector by the corresponding components in vector.
Adds the given vector to this vector and returns a reference to this vector.
See also operator-=().
Subtracts the given vector from this vector and returns a reference to this vector.
See also operator+=().
Divides this vector's coordinates by the given divisor, and returns a reference to this vector.
See also operator*=().
Divides the components of this vector by the corresponding components in vector.
This function was introduced in Qt 5.5.
See also operator*=().
Returns the component of the vector at index position i as a modifiable reference.
i must be a valid index position in the vector (i.e., 0 <= i < 2).
This function was introduced in Qt 5.2.
Returns the component of the vector at index position i.
i must be a valid index position in the vector (i.e., 0 <= i < 2).
This function was introduced in Qt 5.2.
Returns true if v1 and v2 are equal, allowing for a small fuzziness factor for floating-point comparisons; false otherwise.
Returns true if v1 is not equal to v2; otherwise returns false. This operator uses an exact floating-point comparison.
Returns a copy of the given vector, multiplied by the given factor.
See also QVector2D::operator*=().
Returns a copy of the given vector, multiplied by the given factor.
See also QVector2D::operator*=().
Multiplies the components of v1 by the corresponding components in v2.
Returns a QVector2D object that is the sum of the given vectors, v1 and v2; each component is added separately.
See also QVector2D::operator+=().
Returns a QVector2D object that is formed by subtracting v2 from v1; each component is subtracted separately.
See also QVector2D::operator-=().
This is an overloaded function.
Returns a QVector2D object that is formed by changing the sign of the components of the given vector.
Equivalent to QVector2D(0,0) - vector.
Returns the QVector2D object formed by dividing all three components of the given vector by the given divisor.
See also QVector2D::operator/=().
Returns the QVector2D object formed by dividing components of the given vector by a respective components of the given divisor.
This function was introduced in Qt 5.5.
See also QVector2D::operator/=().
Writes the given vector to the given stream and returns a reference to the stream.
See also Serializing Qt Data Types.
Returns true if v1 is equal to v2; otherwise returns false. This operator uses an exact floating-point comparison.
Reads a 2D vector from the given stream into the given vector and returns a reference to the stream.
See also Serializing Qt Data Types.
