Drawing Objects on Screen

For some reason, I'm having a hard time drawing objects on screen. Here's my code:

Level.java

Code :

---

package com.gravitygamesinteractive.kylethecaiman;
 
import java.awt.*;
import java.util.*;
import java.io.File;
 
public class Level {
	public Tile tile;
	private Scanner s;
	private int objectId;
	private int spx;
	private int spy;
	private String oidstr;
	private String xstr;
	private String ystr;
	private ArrayList<String> objarray= new ArrayList<String>();
	private ArrayList<String> xarray= new ArrayList<String>();
	private ArrayList<String> yarray= new ArrayList<String>();
	public Level(){
		setStage();
	}
 
	public void tick(){
 
	}
 
	public void render(Graphics g){
	}
 
	public void setStage(){
		tile=new Tile(0,0);
		tile=new Tile(0,0);
		}
	}
}

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Tile.java:

Code :

---

package com.gravitygamesinteractive.kylethecaiman;
 
import java.awt.*;
 
import javax.swing.JFrame;
 
public class Tile extends Rectangle{
	private static final long serialVersionUID=1L;
	public Tile(int x, int y){
		this.x=x;
		this.y=y;
	}
	public void render(Graphics g){
		g.setColor(Color.red);
		g.drawRect(x,y,16,16);
	}
}

---

The problem is that the Tile object will only be created at the last instance of "tile=new Tile". I can't seem to figure out how to create them both. Just writing new Tile doesn't work either, as the objects won't draw.

I figured out I need an arraylist to create more than one of the same object. Unfortunately, I can't figure out how to call the render method on each individual object. Here's what I'm got:

Level.java:

Code :

---

package com.gravitygamesinteractive.kylethecaiman;
 
import java.awt.*;
import java.util.*;
import java.io.File;
 
public class Level {
	public ArrayList<Tile> tile=new ArrayList<Tile>();
	private Scanner s;
	private int objectId;
	private int spx;
	private int spy;
	private String oidstr;
	private String xstr;
	private String ystr;
	private ArrayList<String> objarray= new ArrayList<String>();
	private ArrayList<String> xarray= new ArrayList<String>();
	private ArrayList<String> yarray= new ArrayList<String>();
	public Level(){
        setStage();
	}
 
	public void tick(){
 
	}
 
	public void render(Graphics g){
		for(int d=0;d<tile.size();d++){
			tile<Tile>.render(g);
		}
	}
	public void setStage(){
		tile.add(new Tile(0,0));
		tile.add(new Tile(0,0));
                }
	}
}

---

You would draw your image in the paintComponent(...) method of a JPanel or other JComponent derived class. You could loop through your ArrayList in this paintComponent method.

How would I do that? Level.java's draw method is called by a JPanel if thats what you mean.

Quote:

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Originally Posted by Gravity Games

How would I do that? Level.java's draw method is called by a JPanel if thats what you mean.

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Have you gone through the Swing graphics/drawing tutorial? I'm meaning nothing more than is described there.

Your levels are held by a class derived from JComponent correct? Simply draw the level in that object's paintComponent method. The background image would likely be in a BufferedImage, and the sprites would be drawn individually by going through the array list.

Oh, I'm already doing that (I had no problem when drawing one object), the problem is defining the individual objects of the arraylist. For example:

The array list contains (Object 1, object 2, object 3)

and the loop needs to do this:

object1.render
object2.render
object3.render

How do I call the objects in the ArrayList of Tile objects?

In the paintComponent method, loop through the ArrayList calling render on the components in the list, passing in the Graphics object.

Ah, thank you. I had forgot to use .get to access the components. That was the problem.