Background:
I'm tearing my hair here because I've used awt and Swing a couple of times, and I always run into a roadblock during my initial graphics setup and I never seem to have an "Of course, this thing again! I just have to something something"-moment. This time I can't seem to get even basic drawing to work!
Problem description:
I wish to draw a number of simple boxes in a JFrame (via a JPanel, if necessary). To this end I have a Sprite extends JComponent class which currently only draws simple geometric shapes but will eventually do things with BufferedImageor somesuch.
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Rectangle;
import javax.swing.JComponent;
@SuppressWarnings("serial")
public class Sprite extends JComponent {
private Rectangle rctBounds;
private Color clrFill;
public Sprite(int x, int y, Color color) {
this.rctBounds = new Rectangle(x, y, 100, 100);
this.clrFill = color;
}// Sprite(int,int,Color)
@Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(clrFill);
g.fillRect(rctBounds.x, rctBounds.y, rctBounds.width, rctBounds.height);
}// paintComponent(Graphics)
}// Sprite.class
The window for these to go in is obtained by a simple Win extends JFrame class á:
import javax.swing.JFrame;
public class Win extends JFrame{
public Win(){
setSize(800,600);
setLocation(100,100);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
}
Finally, components are initialized and connected in the main method, in the class run, using JComponent's (I believe) add() method, called on an instance of Win:
import java.awt.Color;
public class run {
public static void main(String[] args) {
Win w = new Win();
Sprite s1 = new Sprite(10,100, Color.BLUE);
Sprite s2 = new Sprite(200,200, Color.RED);
Sprite s3 = new Sprite(300,200, Color.CYAN);
w.add(s1);
w.add(s2);
w.add(s3);
}//main()
}//run.class
Expectations vs. Reality:
Now, I expect a window with three colored boxes, as in this image (all boxes visible). Instead, only the final JComponent to be added shows up, as seen here (only cyan box painted). What's even more infuriating is that attempting to edit the JFrame's layout or adding a JPanel as an intermediary container for the Sprites results in a blank window.
Exasperated Plea:
I'm at a complete loss! Everything I find on here talks about improper use of paintComponent(Graphics) (using paint() instead, forgetting to @Override, not propagating the graphical context properly, etc) or to use a JPanel as an intermediary container. The most infuriating part of all this is that I've built two functioning programs using Swing before (school assignments) and, looking at that code, I cannot for the life of me figure out what I'm doing wrong here! Please help!
