Rotate Vertical direction of JLabel Text

Question

I tried rotating JLabel text on based selected angles 30, 90 etc.I wrote CustomJLabel class:

public CustomJLabel extends JLabel {

    private int angle=360; //setter and getters

    @Override 
    public void paintComponent(Graphics g) {   
        super.paintComponent(g);   
        Rectangle rectangle = g2d.getClipBounds(); 
        g2d.rotate((getAngle() * java.lang.Math.PI) / 4, rectangle.getCenterX(), rectangle.getCenterY());   
    } 
}

Main.java:

CustomJLabel cst=new CustomJLabel ();
cst.setAngle(value);
cst.repaint();
cst.setSize(getPrefferedsize());

When running above code. Its rotated the text correct based on angle. But its not correctly the rectangle shape. Please check the below images.

Horizontal (360)

Vertical (90)

Please observe Red Color Circles and the image was Vertical 90 degress and check the. Here is the missing top and bottom lines for JLabel. Why is it missing?

Answer 1

Recall that Graphics specifies the following:

Operations that draw the outline of a figure operate by traversing an infinitely thin path between pixels with a pixel-sized pen that hangs down and to the right ^* of the anchor point on the path.

When you draw a Rectangle having the dimensions returned by getClipBounds() using the identity transform, it will be clipped on the right and bottom. When you draw the same Rectangle using a different transform, the result will be clipped in a way that depends, in part, on rounding error.

^{* emphasis added.}