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vector4d QML Value Type

向量 4d 类型具有 x、y、z 和 w 属性。更多

详细说明

vector4d 类型具有x,y,z 和w 属性，否则与vector3d 类型类似。

vector4d 类型的属性默认为零向量。x,y,z 和w 设置为0 。

更多信息，请参阅vector3d 类型的相关文档。

要创建vector4d 值，可将其指定为 "x,y,z,w "字符串，或单独定义组件，或使用 Qt.vector4d() 函数组成。

vector4d 类型有以下可在 QML 中调用的幂函数：

函数签名描述示例
real dotProduct(vector4d other)返回this vector4d 与other vector4d 的点积的标量实数结果。
var a = Qt.vector4d(1,2,3,4);
var b = Qt.vector4d(5,6,7,8);
var c = a.dotProduct(b);
console.log(c); // 70
vector4d times(matrix4x4 matrix)Returns the vector4d result of transformingthis vector4d with the 4x4matrix with the matrix applied post-vector
var a = Qt.vector4d(1,2,3,4);
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()); // QVector4D(120, 130, 140, 150)
vector4d times(vector4d other)返回this vector4d 与other vector4d 相乘的 vector4d 结果
var a = Qt.vector4d(1,2,3,4);
var b = Qt.vector4d(5,6,7,8);
var c = a.times(b);
console.log(c.toString()); // QVector4D(5, 12, 21, 32)
vector4d times(real factor)返回this vector4d 与标量相乘的 vector4d 结果factor
var a = Qt.vector4d(1,2,3,4);
var b = 4.48;
var c = a.times(b);
console.log(c.toString()); // QVector3D(4.48, 8.96,
                                        13.44, 17.92)
vector4d plus(vector4d other)返回this vector4d 与other vector4d 相加的 vector4d 结果
var a = Qt.vector4d(1,2,3,4);
var b = Qt.vector4d(5,6,7,8);
var c = a.plus(b);
console.log(c.toString()); // QVector4D(6, 8, 10, 12)
vector4d minus(vector4d other)返回other vector4d 与this vector4d 相减的 vector4d 结果
var a = Qt.vector4d(1,2,3,4);
var b = Qt.vector4d(5,6,7,8);
var c = a.minus(b);
console.log(c.toString()); // QVector4D(-4, -4, -4, -4)
vector4d normalized()返回this 向量的归一化形式
var a = Qt.vector4d(1,2,3,4);
var b = a.normalized();
console.log(b.toString());
// QVector4D(0.182574, 0.365148, 0.547723, 0.730297)
real length()返回this vector3d 长度的标量实值
var a = Qt.vector4d(1,2,3,4);
var b = a.length();
console.log(b.toString()); // 5.477225575051661
vector2d toVector2d()返回this vector4d 转换为 vector2d 的结果
var a = Qt.vector4d(1,2,3,4);
var b = a.toVector2d();
console.log(b.toString()); // QVector2D(1, 2)
vector3d toVector3d()返回将this vector4d 转换为 vector3d 的 vector3d 结果
var a = Qt.vector4d(1,2,3,4);
var b = a.toVector3d();
console.log(b.toString()); // QVector3D(1, 2, 3)
bool fuzzyEquals(vector4d other, real epsilon)如果this vector4d 近似等于other vector4d，则返回 true。如果this 的每个属性都在other 的epsilon 范围内，则近似值为真。请注意，epsilon 是一个可选参数，默认epsilon 为 0.00001。
var a = Qt.vector4d(1,2,3,4);
var b = Qt.vector4d(1.0001, 1.9998, 2.0001, 3.9999);
var c = a.fuzzyEquals(b);        // default epsilon
var d = a.fuzzyEquals(b, 0.005); // supplied epsilon
console.log(c + " " + d); // false true

该值类型由QtQuick 导入提供。

另请参阅 QML 值类型。

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