CODEWITHSUNDEEP
javaswinggraphicspaint
user3310825
user3310825

Reputation:

Placing text in an contend box

Ive got a problem with placing String text in my frame, using paintComponent method.

It Looks like that:

enter image description here

I dunno why it doesn't want to place String in proper place, given that I've even counted pixels.

import java.awt.EventQueue;
import javax.swing.JFrame;

public class FrameMain {

public static void main(String[] args) {

    EventQueue.invokeLater(new Runnable() {
        public void run() {
            JFrame frame = new DrawFrame();
            frame.setVisible(true);
        }
    });

}


public class DrawFrame extends JFrame {

public DrawFrame()
{
    setTitle("Frame with a component containing String");
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setBounds (100, 100, 300, 300 );
    DrawComponent draw = new DrawComponent();
    add(draw);

}


public class DrawComponent extends JComponent {

public void paintComponent(Graphics g) {
    g.drawString("First string in component located in frame", WIDTH, HEIGHT);

    final int WIDTH = 175;
    final int HEIGHT = 200;
}

Upvotes: 1

Views: 51

Answers (2)

camickr
camickr

Reputation: 324128

g.drawString("First string in component located in frame", WIDTH, HEIGHT);
//final int WIDTH = 175;
//final int HEIGHT = 200;

Never define a variable after you use it. WIDTH and HEIGHT are variables from other Swing class that default to 0.

final int WIDTH = 175;
final int HEIGHT = 200;
g.drawString("First string in component located in frame", WIDTH, HEIGHT);

Edit:

I want the String to set position given the size of frame, not position of it.

Don't do custom painting. Use a JLabel. 

JLabel label = new JLabel("centered");
label.setHorizontalAlignment( JLabel.CENTER );
frame.add(label);

Upvotes: 3

Paul Samsotha
Paul Samsotha

Reputation: 209012

The Problem is you have 

 final int WIDTH = 175;
 final int HEIGHT = 200;

declared after drawString(..., WIDTH, HEIGHT)

What is happening is that JComponent also has a contant HEIGHT and WIDTH, so the drawString is using the WIDTH and HEIGHT of JComponet and not the ones you declared.

If you want to use yours, then just place it before the drawString

final int WIDTH = 175;
final int HEIGHT = 200;
g.drawString("First string in component located in frame", WIDTH, HEIGHT);

UPDATE

To center the text, you need to use FontMetrics. See here

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        String message = "First string in component located in frame";
        Font font = new Font("impact", Font.PLAIN, 14);
        g.setFont(font);
        FontMetrics fm = g.getFontMetrics(font);
        int stringWidth = fm.stringWidth(message);
        int height = fm.getAscent();
        int x = getWidth()/2 - stringWidth/2;
        int y = getHeight()/2 + height/2;
        g.drawString(message, x, y);    
    }

Upvotes: 2

Related Questions