Question

I am trying to write an integer number inside the graphic figure and want it positioning to always be at the center.

Is there any way to do so?

Currently I am writing this which is not good :

Font font = new Font("Arial", Font.BOLD, 20);

g.setFont(font);
g.setColor(this.color);
g.fillOval(b.x, b.y, b.width, b.height);
g.setColor(Color.black);
g.drawString("1", b.x + b.width/2 , b.y+ b.height/2);

where b is a rectangle.

Answer 1

You can use the FontMetrics class to determine the exact size of the String you want to display, and then subtract half its X and Y dimensions from your center point, and draw it there, like this:

    FontMetrics fm = g.getFontMetrics();
    Rectangle2D rect = fm.getStringBounds("1", g);
    g.drawString("1", (int) (b.x + b.width/2 - rect.getWidth()/2),
                      (int) (b.y + b.height/2 + rect.getHeight()/2));