Make line connected corners rounded in opencv

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C++

Visual-Studio

VS2010

OpenCV

Hi,
Q1.
i have 3 points and they are connected from 3 lines..Now i want to make those corners rounded...make smooth corners..is there any opencv function to do this ?

Q2.
i have tried the Bezier curve algorithm to draw rounded corners but it draws the curve in another place...not like shown in this image
http://en.wikipedia.org/wiki/File:Bezier_2_big.gif


below is my function...can anyone say where i went wrong ? Thanks in advance :-)

void BezierCurveCalcCurve(CvPoint pt1, CvPoint pt2, CvPoint pt3)
{
     for (int t = 0; t < 101; t++)
    {

    double xt = pow(1-(t/100.0),2.0) * pt1.x + 2*(1-(t/100.0)) * (t/100.0) * pt2.x + (t/100.0)*(t/100.0) * pt3.x;

    double yt =  pow(1-(t/100.0),2.0) * pt1.y + 2*(1-(t/100.0)) * (t/100.0) * pt2.y + (t/100.0)*(t/100.0) * pt3.y;

    cvSet2D(image,xt, yt, cvScalar(255,0,0,0));
    }

}