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POTransitioning to an abstract class
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  1. POTransitioning to an abstract class
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    copied!<p>I am desperately trying to implement some things which I don't think I fully understand. I am attempting to set it up so the commented out actions can be taken (I will need to change syntax but I want to make sure I am on the right track first). </p> <p>Am I going about this the right way? Where will my drawing actions go if not in the draw method? I get lots of errors when I move it there. Thanks</p> <pre><code>import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.Graphics2D; import java.awt.Graphics; public class Test extends JPanel{ abstract class graphic { public Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize(); private int[] location = new int[] {screenSize.width/2,screenSize.height/2}; } public class gladiator extends graphic { void draw() { //g2d.setColor(Color.green); //g2d.fillArc(location[0], location[1], 100, 100, 45, 90); //g2d.setColor(Color.black); //g2d.fillArc((location[0]+50-10),(location[1]+50-10), 20, 20, 0, 360); } } @Override protected void paintComponent(Graphics g) { super.paintComponent(g); new Timer(200, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // setLocation((location[0]+1),location[1]); repaint(); System.out.println("repainting"); } }).start(); } public void setLocation(int x, int y){ //this.location[0] = x; //this.location[1] = y; } public static void main(String[] args){ JFrame jf=new JFrame(); jf.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); jf.setPreferredSize(Toolkit.getDefaultToolkit().getScreenSize()); jf.add(new Test()); jf.pack(); jf.setVisible(true); } } </code></pre> <p>My original code:</p> <pre><code>import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class Test extends JPanel{ private int[] location = new int[2]; @Override protected void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(Color.red); g.fillArc(location[0], location[1], 100, 100, 45, 90); g.setColor(Color.black); g.fillArc((location[0]+50-10),(location[1]+50-10), 20, 20, 0, 360); new Timer(2000, new ActionListener() { @Override public void actionPerformed(ActionEvent e) { setLocation((location[0]+50),50); repaint(); System.out.println("repainting"); } }).start(); } public void setLocation(int x, int y){ this.location[0] = x; this.location[1] = y; } public static void main(String[] args){ JFrame jf=new JFrame(); jf.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); jf.setPreferredSize(new Dimension(300,500)); jf.setLocation(100,100); jf.add(new Test()); jf.pack(); jf.setVisible(true); } } </code></pre> <p>Edit: Should have included this bit, first commenter was right.</p> <p>The error is cannot find symbol, referring to g2d or g, whichever. I take it to mean that drawing can only happen inside of paint components and that I will have to find a way to include all the instructions for drawing there. I want to make sure I'm just doing something fundamentally wrong, though as this is my first brush with both abstract classes and 2d drawing in java. Also, I know the location[0] etc will not work as is. Lets ignore that.</p> <p>The bottom code is what I am trying to accomplish (at least at first), but I am trying to use something similar to the top code to create multiple instances of it which can operate independently.</p>
 

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