Problem with JPanel after rotation

Question

Hi,
I am developing a graphics editor like mspaint. I have JPanel as my drawing canvas. now the problem is when I rotate the canvas, co-ordinates on the canvas are also getting rotate with it. for example if top-left corner is (0,0) initially then after rotating it 90 degree top-right corner becomes (0,0) and same for all the points on the canvas.
the code i m using for rotation is
contentPanel = new JPanel(){
@Override
protected void paintComponent(Graphics g) {                       
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g;
Rectangle rect=g2.getClipBounds();
if(rotation!=0){
double angle = rotation * Math.PI/2;
g2.rotate(angle,getWidth()/2,getHeight()/2);
rect=g2.getClipBounds();
setPreferredSize(new Dimension(rect.width,rect.height));
super.paintComponent(g);
revalidate();
};

Answer 1

Whats your question?
If you rotate it, of course the points will rotate, they have to.