转换GdkPoint

Question

如何转换gdkpoint？说：

GdkPoint p2 = sometransform.transform(P1);  

Answer 1

它应该用PangoMatrix完成，这里x和y坐标需要设置为x和y值，并对（x，y）值应用当前变换。

    PangoMatrix elementMatrix = PANGO_MATRIX_INIT; 

    GdkPoint elementCenter;

    // do some other operations here like translation, rotation etc... 

    double *x, *y;
    *x = elementCenter.x;
    *y = elementCenter.y;

     pango_matrix_transform_point(&elementMatrix,x,y);