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rotating a image from a given mouse coordinate

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Hi, Im playing about with java, and doing some simple sprite manipulation, but my math is not very good and so i was wondering if someone could explain to me how i would rotate and image to face the direction of where the mouse pointer is, the method call to rotate the image is easy enough but im unsure how i would work out how many degree it would need to turn, in order to face the mouse, hope im making sense? cheers

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this is simple trigonometry.

public void mouseMoved(MouseEvent e){
int mx=e.getX();
int my=e.getY();
int cx=imageX-imageWidth/2;
int cy=imageY-imageHeight/2;
int dx=mx-cx;
int dy=my-cy;
double angle=Math.atan2((double)dy,(double)dx);
Graphics2D g=(Graphics2D) YourFrame.getGraphics();
g.drawImage(image, imageX, imageY, null);

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