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  4. QML 类型
  5. vector3d

vector3d QML Value Type

a value with x, y, and z attributes. 更多...

详细描述

The vector3d type refers to a value with x , y ，和 z 属性。

Properties of type vector3d have a zero vector by default. This has x , y and z 设为 0 .

要创建 vector3d value, specify it as a "x,y,z" string: 

Rotation { angle: 60; axis: "0,1,0" }

or with the Qt.vector3d () 函数： 

Rotation { angle: 60; axis: Qt.vector3d(0, 1, 0) }

or as separate x , y ，和 z components: 

Rotation { angle: 60; axis.x: 0; axis.y: 1; axis.z: 0 }

Each attribute of a vector3d value is stored internally as a single-precision floating point number ( float ).

When integrating with C++, note that any QVector3D 值 passed into QML from C++ is automatically converted into a vector3d value, and vice-versa.

The vector3d type has the following idempotent functions which can be invoked in QML:

函数签名 描述 范例
vector3d crossProduct(vector3d other) Returns the vector3d result of the cross product of this vector3d with the other vector3d 
var a = Qt.vector3d(1,2,3);
var b

=



Qt



.

vector3d(

4


,


5


,


6

);
var c

=

a

.

crossProduct(b);
console

.

log(c

.

toString());

// QVector3D(-3, 6, -3)
real dotProduct(vector3d other) Returns the scalar real result of the dot product of this vector3d with the other vector3d 
var a = Qt.vector3d(1,2,3);
var b

=



Qt



.

vector3d(

4


,


5


,


6

);
var c

=

a

.

dotProduct(b);
console

.

log(c);

// 32
vector3d times(matrix4x4 matrix) Returns the vector3d result of transforming this vector3d with the 4x4 matrix with the matrix applied post-vector 
var a = Qt.vector3d(1,2,3);
var b

=



Qt



.

matrix4x4(

4


,


5


,


6


,


7


,


8


,


9


,


10


,


11


,


12


,


13


,


14


,


15


,


16


,


17


,


18


,


19

);
var c

=

a

.

times(b);
console

.

log(c

.

toString());

// QVector3D(0.774194, 0.849462, 0.924731)
vector3d times(vector3d other) Returns the vector3d result of multiplying this vector3d with the other vector3d 
var a = Qt.vector3d(1,2,3);
var b

=



Qt



.

vector3d(

4


,


5


,


6

);
var c

=

a

.

times(b);
console

.

log(c

.

toString());

// QVector3D(4, 10, 18)
vector3d times(real factor) Returns the vector3d result of multiplying this vector3d with the scalar factor 
var a = Qt.vector3d(1,2,3);
var b

=


4.48

;
var c

=

a

.

times(b);
console

.

log(c

.

toString());

// QVector3D(4.48, 8.96, 13.44)
vector3d plus(vector3d other) Returns the vector3d result of the addition of this vector3d with the other vector3d 
var a = Qt.vector3d(1,2,3);
var b

=



Qt



.

vector3d(

4


,


5


,


6

);
var c

=

a

.

plus(b);
console

.

log(c

.

toString());

// QVector3D(5, 7, 9)
vector3d minus(vector3d other) Returns the vector3d result of the subtraction of other vector3d from this vector3d 
var a = Qt.vector3d(1,2,3);
var b

=



Qt



.

vector3d(

4


,


5


,


6

);
var c

=

a

.

minus(b);
console

.

log(c

.

toString());

// QVector3D(-3, -3, -3)
vector3d normalized() Returns the normalized form of this vector 
var a = Qt.vector3d(1,2,3);
var b

=

 a

.

normalized();
console

.

log(b

.

toString());

// QVector3D(0.267261, 0.534522, 0.801784)
real length() Returns the scalar real value of the length of this vector3d 
var a = Qt.vector3d(1,2,3);
var b

=

 a

.

length();
console

.

log(b

.

toString());

// 3.7416573867739413
vector2d toVector2d() Returns the vector2d result of converting this vector3d to a vector2d 
var a = Qt.vector3d(1,2,3);
var b

=

 a

.

toVector2d();
console

.

log(b

.

toString());

// QVector2D(1, 2)
vector4d toVector4d() Returns the vector4d result of converting this vector3d to a vector4d 
var a = Qt.vector3d(1,2,3);
var b

=

 a

.

toVector4d();
console

.

log(b

.

toString());

// QVector4D(1, 2, 3, 0)
bool fuzzyEquals(vector3d other, real epsilon) 返回 true 若 this vector3d is approximately equal to the other vector3d. The approximation will be true if each attribute of this is within epsilon of other 。注意， epsilon is an optional argument, the default epsilon is 0.00001. 
var a = Qt.vector3d(1,2,3);
var b

=



Qt



.

vector3d(

1.0001


,


1.9998


,


2.0001

);
var c

=

a

.

fuzzyEquals(b);

// default epsilon

var d

=

a

.

fuzzyEquals(b

,


0.005

);

// supplied epsilon

console

.

log(c

+


" "


+

d);

// false true

This value type is provided by the QtQuick 导入。

另请参阅 QML 值类型 .

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