Matrix.RotatePrepend(Double) Matrix.RotatePrepend(Double) Matrix.RotatePrepend(Double) Matrix.RotatePrepend(Double) Method

定義

在這個 Matrix 結構之前加上所指定角度的旋轉。Prepends a rotation of the specified angle to this Matrix structure.

public:
 void RotatePrepend(double angle);
public void RotatePrepend (double angle);
member this.RotatePrepend : double -> unit
Public Sub RotatePrepend (angle As Double)

參數

angle
Double Double Double Double

要在前面加上的旋轉角度。The angle of rotation to prepend.

範例

下列範例示範如何在之前加上旋轉MatrixThe following example shows how to prepend a rotation to a Matrix.

private Matrix prependRotateExample()
{

    Matrix myMatrix = new Matrix(5, 10, 15, 20, 25, 30);

    // Prepend a 90 degree rotation about the origin.
    // myMatrix is now equal to  (15,20,-5,-10,25,30).
    myMatrix.RotatePrepend(90);

    return myMatrix;
}


private Matrix prependRotateAboutPointExample()
{

    Matrix myMatrix = new Matrix(5, 10, 15, 20, 25, 30);

    // Prepend a 90 degree rotation about the 
    // point (100,100). 
    // myMatrix is now equal to  (15,20,-5,-10,1025,2030).
    myMatrix.RotateAtPrepend(90, 100, 100);

    return myMatrix;
}

備註

在複合轉換中, 個別轉換的順序很重要。In a composite transformation, the order of individual transformations is important. 例如, 如果您先旋轉, 然後調整規模, 然後轉譯, 則會得到不同的結果, 而不是您第一次轉譯, 然後旋轉再調整。For example, if you first rotate, then scale, then translate, you get a different result than if you first translate, then rotate, then scale. 其中一個原因是很重要的, 就是旋轉和縮放之類的轉換是根據座標系統的原點來完成。One reason order is significant is that transformations like rotation and scaling are done with respect to the origin of the coordinate system. 調整以原點為中心的物件, 會產生不同的結果, 而不是縮放已從原點移出的物件。Scaling an object that is centered at the origin produces a different result than scaling an object that has been moved away from the origin. 同樣地, 旋轉原點中央的物件, 會產生不同的結果, 而不是旋轉離開來源的物件。Similarly, rotating an object that is centered at the origin produces a different result than rotating an object that has been moved away from the origin.

適用於

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