Text on a sinusoid, SetWorldTransform

Need to display text Contour sinusoid. Using a rotation system kordinat function SetWorldTransform for her needs structure XFORM how to calculate the formula slope (angle), to substitute the parameters

xf.eM22 = xf.eM11 = cos (angle);
xf.eM12 = - (xf.eM21 = sin (angle));
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