Specifying a circle with 2 mouse presses

Question

Hi,
I'm trying to create an applet that allows the user to specify a circle with 2 mouse presses. I'd like the 1st point to represent the circle's centre and the 2nd to be any point on the periphery.
Creating a mouse press event handler is a given obviously within the applet. I think I'm going to need to create a variable to store the count of the mouse presses (i.e. so that I know when there've been two and the circle can be created).
Can anyone tell me what the basic logic would be to actually create the circle based on the 2 mouse presses?
Thanks.

Answer 1

Can anyone tell me what the basic logic would be to
actually create the circle based on the 2 mouse
presses?
implements MouseListener{
  int centerX = 0;
  int centerY = 0;
  int radius = 0;
public void paint(Graphics g){
  g.drawOval(centerX-radius, centerY-radius,
             centerX+radius, centerY+radius);
public void mousePressed(MouseEvent me){
  centerX = me.getX();
  centerY = me.getY();
public void mouseReleased(MouseEvent me){
  //a line from the center
  //length of x
  int x = me.getX()-centerX;
  //length of y
  int y = me.getY()-centerY;
  //a2 + b2 = c2
  radius = sqrt(pow(x, 2)+pow(y, 2));
}i think this will work.. I used mousePressed and mouseReleased instead of two clicks.. but you can alter this if you like of course.. im not that very sure of the radius calculation, but i hope you get my point :)