CDC::Pie help needed

[clow]

Hello,

I am suing CDC::Pie to draw a pie shape on the screen. The function is this:

BOOL Pie(LPCRECT lpRect, POINT ptStart, POINT ptEnd);

Say I just know the angle I need for the pie, how can I calculate the start and end points from the angle and a given angle sweep?

I tried this:

float angle1 = 0;
float angle2 = 90; // sweep angle
int radius = rectClient.CenterPoint().x;
int x1 = rectClient.CenterPoint().x + radius * cos(Degrees2Radians(angle1));
int y1 = rectClient.CenterPoint().y + radius * sin(Degrees2Radians(angle1));
int x2 = rectClient.CenterPoint().x + radius * cos(Degrees2Radians(angle1+angle2));
int y2 = rectClient.CenterPoint().y + radius * sin(Degrees2Radians(angle1+angle2));

and it seems to work, but the coordinate system seems to be:

           -90
            |
            |
+-180---------------- 0
            |
            |
            90

How can I get it into this coordinate system:

            0
            |
            |
  270---------------- 90
            |
            |
           180

Thanks!