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vector2d QML Value Type

vector2d 类型具有 x 和 y 属性。更多

详细说明

vector2d 类型具有x 和y 属性，否则与vector3d 类型类似。

vector2d 类型的属性默认值为零向量。x 和y 都设置为0 。

更多信息，请参阅vector3d 类型的相关文档。

要创建vector2d 值，可将其指定为 "x,y "字符串，或单独定义分量，或使用 Qt.vector2d() 函数将其组成。

vector2d 类型有以下可在 QML 中调用的幂函数：

函数签名说明示例
real dotProduct(vector2d other)返回this vector2d 与other vector2d 的点积的标量实数结果。
var a = Qt.vector2d(1,2);
var b = Qt.vector2d(3,4);
var c = a.dotProduct(b);
console.log(c); // 11
vector2d times(vector2d other)返回this vector2d 与other vector2d 相乘的 vector2d 结果。
var a = Qt.vector2d(1,2);
var b = Qt.vector2d(3,4);
var c = a.times(b);
console.log(c.toString()); // QVector2D(3, 8)
vector2d times(real factor)返回this vector2d 与标量相乘的 vector2d 结果factor
var a = Qt.vector2d(1,2);
var b = 4.48;
var c = a.times(b);
console.log(c.toString()); // QVector2D(4.48, 8.96)
vector2d plus(vector2d other)返回this vector2d 与other vector2d 相加的 vector2d 结果
var a = Qt.vector2d(1,2);
var b = Qt.vector2d(3,4);
var c = a.plus(b);
console.log(c.toString()); // QVector2D(4, 6)
vector2d minus(vector2d other)返回other vector2d 与this vector2d 相减的 vector2d 结果
var a = Qt.vector2d(1,2);
var b = Qt.vector2d(3,4);
var c = a.minus(b);
console.log(c.toString()); // QVector2D(-2, -2)
vector2d normalized()返回this 向量的归一化形式
var a = Qt.vector2d(1,2);
var b = a.normalized();
console.log(b.toString()); // QVector2D(0.447214, 0.894427)
real length()返回this vector2d 长度的标量实值
var a = Qt.vector2d(1,2);
var b = a.length();
console.log(b.toString()); // 2.23606797749979
vector3d toVector3d()返回this vector2d 转换为 vector3d 的结果
var a = Qt.vector2d(1,2);
var b = a.toVector3d();
console.log(b.toString()); // QVector3D(1, 2, 0)
vector4d toVector4d()返回将this vector2d 转换为 vector4d 后的 vector4d 结果
var a = Qt.vector2d(1,2);
var b = a.toVector4d();
console.log(b.toString()); // QVector4D(1, 2, 0, 0)
bool fuzzyEquals(vector2d other, real epsilon)如果this vector2d 近似等于other vector2d，则返回 true。如果this 的每个属性都在other 的epsilon 范围内，近似值将为真。请注意，epsilon 是一个可选参数，默认epsilon 为 0.00001。
var a = Qt.vector2d(1,2);
var b = Qt.vector2d(1.0001, 1.9998);
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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