The QVector2D class represents a vector or vertex in 2D space. More...
| Header: | #include <QVector2D> |
| CMake: | find_package(Qt6 REQUIRED COMPONENTS Gui) target_link_libraries(mytarget PRIVATE Qt6::Gui) |
| qmake: | QT += gui |
| QVector2D(QVector4D vector) | |
| QVector2D(QVector3D vector) | |
| QVector2D(QPointF point) | |
| QVector2D(QPoint point) | |
| QVector2D(float xpos, float ypos) | |
| QVector2D() | |
| float | distanceToLine(QVector2D point, QVector2D direction) const |
| float | distanceToPoint(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*=(QVector2D vector) |
| QVector2D & | operator+=(QVector2D vector) |
| QVector2D & | operator-=(QVector2D vector) |
| QVector2D & | operator/=(float divisor) |
| QVector2D & | operator/=(QVector2D vector) |
| float & | operator[](int i) |
| float | operator[](int i) const |
| float | dotProduct(QVector2D v1, QVector2D v2) |
| bool | qFuzzyCompare(QVector2D v1, QVector2D v2) |
| bool | operator!=(QVector2D v1, QVector2D v2) |
| QVector2D | operator*(float factor, QVector2D vector) |
| QVector2D | operator*(QVector2D vector, float factor) |
| QVector2D | operator*(QVector2D v1, QVector2D v2) |
| QVector2D | operator+(QVector2D v1, QVector2D v2) |
| QVector2D | operator-(QVector2D v1, QVector2D v2) |
| QVector2D | operator-(QVector2D vector) |
| QVector2D | operator/(QVector2D vector, float divisor) |
| QVector2D | operator/(QVector2D vector, QVector2D divisor) |
| QDataStream & | operator<<(QDataStream &stream, QVector2D vector) |
| bool | operator==(QVector2D v1, QVector2D v2) |
| QDataStream & | operator>>(QDataStream &stream, QVector2D &vector) |
Vectors are one of the main building blocks of 2D representation and drawing. They consist of two finite floating-point coordinates, traditionally called x and y.
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 vector with x and y coordinates from a 3D vector. The z and w coordinates of vector are dropped.
See also toVector4D().
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 2D point.
Constructs a vector with x and y coordinates from a 2D point.
Constructs a vector with coordinates (xpos, ypos). Both coordinates must be finite.
Constructs a null vector, i.e. with coordinates (0, 0).
[since 5.1] float QVector2D::distanceToLine(QVector2D
point, QVector2D direction) constReturns 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().
[since 5.1] float QVector2D::distanceToPoint(QVector2D
point) constReturns 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(QVector2D v1,
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 current 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 finite x coordinate.
Sets the y coordinate of this point to the given finite y coordinate.
Returns the QPoint form of this 2D vector. Each coordinate is rounded to the nearest integer.
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 finite factor and returns a reference to this vector.
See also operator/=() and operator*().
Multiplies each component of this vector by the corresponding component of vector and returns a reference to this vector.
Note: This is not a cross product of this vector with vector. (Its components add up to the dot product of this vector and vector.)
See also operator/=() and operator*().
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. The divisor must not be either zero or NaN.
See also operator*=().
[since 5.5] QVector2D &QVector2D::operator/=(QVector2D vector)Divides each component of this vector by the corresponding component of vector and returns a reference to this vector.
The vector must have no component that is either zero or NaN.
This function was introduced in Qt 5.5.
See also operator*=() and operator/().
[since 5.2] float &QVector2D::operator[](int i)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.
[since 5.2] float QVector2D::operator[](int i) constReturns 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 finite factor.
See also QVector2D::operator*=().
Returns a copy of the given vector, multiplied by the given finite factor.
See also QVector2D::operator*=().
Returns the QVector2D object formed by multiplying each component of v1 by the corresponding component of v2.
Note: This is not a cross product of v1 and v2 in any sense. (Its components add up to the dot product of v1 and v2.)
See also QVector2D::operator*=().
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 each component of the given vector.
Equivalent to QVector2D(0,0) - vector.
Returns the QVector2D object formed by dividing each component of the given vector by the given divisor.
The divisor must not be either zero or NaN.
See also QVector2D::operator/=().
[since 5.5] QVector2D operator/(QVector2D vector, QVector2D divisor)Returns the QVector2D object formed by dividing each component of the given vector by the corresponding component of the given divisor.
The divisor must have no component that is either zero or NaN.
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.
