Thread: As my player goes lower on-screen my tiles become smaller in height? D:

Pretty much that, the screen stays on the player, the player stays the same size :/

I am new to Java so don't kill me :p

I attached my files, please help!

-Wolf

In the future, post code like using the [code�=java][/code] tags. Next, the program won't run for me on Eclipse. It can't find the main method. Please, explain you program more fully.

There is one, in Component.class. Here's some code then :

Component.class

package net.wolfgamingdev.minecraftplatformer;
 
import java.applet.*;
import java.awt.*;
import javax.swing.*;
 
public class Component extends Applet implements Runnable {
	private static final long serialVersionUID = 1L;
 
	private static int pixelSize = 2;
	public static double sX = 0, sY = 0;
 
	public static Dimension size = new Dimension(700,560);
	public static Dimension pixel = new Dimension(size.width / pixelSize, size.height / pixelSize);	
 
	public static String name = "Minecraft 2D!";
 
	public static boolean isRunning = false;
 
	private Image screen;
 
	public static Level level;
	public static Character character;
 
	//BLERRRGH
	public Component() {
		setPreferredSize(size);
	}
 
	public void start() {
		//Defining Objects
		new Tile(); //Loading images
		level = new Level();
		character = new Character(Tile.tileSize, Tile.tileSize * 2);
 
		//Starting Game Loop
		isRunning = true;
		new Thread(this).start();
	}
 
	public void stop() {
		isRunning = false;
	}
 
	public static void main(String args[]) {
		Component component = new Component();
 
		JFrame frame = new JFrame();
		frame.add(component);
		frame.pack();
		frame.setTitle(name);
		frame.setResizable(false);
		frame.setLocationRelativeTo(null);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
 
		component.start();
	}
 
	public void tick() {
		level.tick();
		character.tick();
	}
 
	public void render() {
		Graphics g = screen.getGraphics();
 
		//Drawing Things
		g.setColor(new Color(100, 100, 255));
		g.fillRect(0, 0, pixel.width, pixel.height);
 
		level.render(g);
		character.render(g);
 
		g = getGraphics();
 
		g.drawImage(screen, 0, 0, size.width, size.height, 0, 0, pixel.width, pixel.height, null);
		g.dispose();
	}
 
	public void run() {
		screen = createVolatileImage(pixel.width,pixel.height);
 
		while(isRunning) {
			tick();
			render();
 
			try {
				Thread.sleep(5);
			} catch(Exception e) { }
		}
	}
}

Level.class

package net.wolfgamingdev.minecraftplatformer;
 
import java.awt.*;
 
public class Level {
	public Block[][] block = new Block[50][50];
 
	public Level() {
		for (int x=0; x<block.length;x++) {
			for (int y=0;y<block[0].length;y++) {
				block[x][y] = new Block(new Rectangle(x * Tile.tileSize, y * Tile.tileSize, Tile.tileSize, Tile.tileSize), Tile.air);
			}
		}
		generateLevel();
	}
 
	public void generateLevel() {
		for (int x=0; x<block.length;x++) {
			for (int y=0;y<block[0].length;y++) {
				if(x == 0 || y == 0 || x == block.length-1 || y == block[0].length-1) {
					block[x][y].id = Tile.earth;
				}
			}
		}
	}
 
	public void tick() {
 
	}
 
	public void render(Graphics g) {
		for (int x=0; x<block.length;x++) {
			for (int y=0;y<block[0].length;y++) {
				block[x][y].render(g);
				}
			}
		}
	}

Block.class (This is where the blocks values are defined)

package net.wolfgamingdev.minecraftplatformer;
 
import java.awt.*;
 
public class Block extends Rectangle {
	private static final long serialVersionUID = 1L;
 
	public int[] id = {-1, -1};
 
	public Block(Rectangle size, int[] id) {
		setBounds(size);
		this.id = id;
	}
 
	public void render(Graphics g) {
		if(id != Tile.air) {
			g.drawImage(Tile.tileset_terrain, (int)x - (int)Component.sX, (int)y - (int)Component.sY, (int)x + width - (int)Component.sX, (int)y + height - (int)Component.sY, id[0] * Tile.tileSize - (int)Component.sX, id[1] * Tile.tileSize - (int)Component.sY, id[0] * Tile.tileSize + Tile.tileSize, id[1] * Tile.tileSize + Tile.tileSize, null);
		}
	}
 
}

Character.class (There is a tile.class as well but it just defines the tiles)

package net.wolfgamingdev.minecraftplatformer;
 
import java.awt.*;
 
public class Character extends DoubleRectangle {
	public double fallingSpeed = 1.3;
 
	public Character(int width, int height) {
		setBounds((Component.pixel.width/2) - (width / 2), (Component.pixel.height/2) - (height / 2), width, height);
	}
 
	public void tick() {
		y += fallingSpeed;
		Component.sY += fallingSpeed;
	}
 
	public void render(Graphics g) {
		g.drawImage(Tile.tileset_terrain, (int)x - (int)Component.sX, (int)y - (int)Component.sY, (int)(x + width) - (int)Component.sX, (int)(y + height) - (int)Component.sY, Tile.character[0] * Tile.tileSize, Tile.character[1] * Tile.tileSize, Tile.character[0] * Tile.tileSize + (int)width, Tile.character[1] * Tile.tileSize + (int)height, null);
	}
}

There is another class called doublerectangle but I think that is just defining the characters values.
Sorry for all the trouble I'm just a newb following a tutorial :/
Honestly I don't understand half of what's in there yet, but I have a theory that the bug has something to do with Component.sY getting bigger....

--- Update ---

It's definitely because of Component.Sy getting added in character.class, commented it out and it fixed it, (without the camera moving)

It's both? That's what this tutorial said. None of my classes have the same name...
Which variables shouldn't be static?

My hasn't even been touched on yet :/

Doesn't static mean that they can be changed? (the point of variables? )

Which class is the same as a Java SE class?

Thanks for trying to help, I don't mean to be a bother :p

static means you don't have to create an object of that type to use it. for example in the Math class, not only do you not need to create a Math object, you can't.

//try putting this into eclipse or something
Math math = new Math();
//it should say that the constructor is not visible
 
 
//however
double x = Math.sqrt(49);
//works because sqrt(double arg) is a static method.

Making a specific variable a 'static variable' allows static methods to use it and for that variable to be accessed in a static way.

When I take off the static variables the program breaks.

--- Update ---

No errors but Nothing shows on screen

Norm - I just...deleted the part that says static (god I'm such a newb) And I can change Component to Engine and Character to Player

Norm - I just...deleted the part that says static (god I'm such a newb) And I can change Component to Engine and Character to Player

Just changed the classes didn't help

--- Update ---

Why do the Tile height decrease as my character falls

--- Update ---

The code didn't change with the exception of the class names. Nothing has changed

I'll re-post all the code's, and can you tell e how I could do that? (instances of the class)

Engine

package net.wolfgamingdev.minecraftplatformer;
 
import java.applet.*;
import java.awt.*;
import javax.swing.*;
 
public class Engine extends Applet implements Runnable {
	private static final long serialVersionUID = 1L;
 
	private static int pixelSize = 2;
	public static double sX = 0, sY = 0;
 
	public static Dimension size = new Dimension(700,560);
	public static Dimension pixel = new Dimension(size.width / pixelSize, size.height / pixelSize);	
 
	public static String name = "Minecraft 2D!";
 
	public static boolean isRunning = false;
 
	private Image screen;
 
	public static Level level;
	public static Player player;
 
	//BLERRRGH
	public Engine() {
		setPreferredSize(size);
	}
 
	public void start() {
		//Defining Objects
		new Tile(); //Loading images
		level = new Level();
		player = new Player(Tile.tileSize, Tile.tileSize * 2);
 
		//Starting Game Loop
		isRunning = true;
		new Thread(this).start();
	}
 
	public void stop() {
		isRunning = false;
	}
 
	public static void main(String args[]) {
		Engine engine = new Engine();
 
		JFrame frame = new JFrame();
		frame.add(engine);
		frame.pack();
		frame.setTitle(name);
		frame.setResizable(false);
		frame.setLocationRelativeTo(null);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
 
		engine.start();
	}
 
	public void tick() {
		level.tick();
		player.tick();
	}
 
	public void render() {
		Graphics g = screen.getGraphics();
 
		//Drawing Things
		g.setColor(new Color(100, 100, 255));
		g.fillRect(0, 0, pixel.width, pixel.height);
 
		level.render(g);
		player.render(g);
 
		g = getGraphics();
 
		g.drawImage(screen, 0, 0, size.width, size.height, 0, 0, pixel.width, pixel.height, null);
		g.dispose();
	}
 
	public void run() {
		screen = createVolatileImage(pixel.width,pixel.height);
 
		while(isRunning) {
			tick();
			render();
 
			try {
				Thread.sleep(5);
			} catch(Exception e) { }
		}
	}
}

Level

package net.wolfgamingdev.minecraftplatformer;
 
import java.awt.*;
 
public class Level {
	public Block[][] block = new Block[50][50];
 
	public Level() {
		for (int x=0; x<block.length;x++) {
			for (int y=0;y<block[0].length;y++) {
				block[x][y] = new Block(new Rectangle(x * Tile.tileSize, y * Tile.tileSize, Tile.tileSize, Tile.tileSize), Tile.air);
			}
		}
		generateLevel();
	}
 
	public void generateLevel() {
		for (int x=0; x<block.length;x++) {
			for (int y=0;y<block[0].length;y++) {
				if(x == 0 || y == 0 || x == block.length-1 || y == block[0].length-1) {
					block[x][y].id = Tile.earth;
				}
			}
		}
	}
 
	public void tick() {
 
	}
 
	public void render(Graphics g) {
		for (int x=0; x<block.length;x++) {
			for (int y=0;y<block[0].length;y++) {
				block[x][y].render(g);
				}
			}
		}
	}

Block

package net.wolfgamingdev.minecraftplatformer;
 
import java.awt.*;
 
public class Block extends Rectangle {
	private static final long serialVersionUID = 1L;
 
	public int[] id = {-1, -1};
 
	public Block(Rectangle size, int[] id) {
		setBounds(size);
		this.id = id;
	}
 
	public void render(Graphics g) {
		if(id != Tile.air) {
			g.drawImage(Tile.tileset_terrain, (int)x - (int)Engine.sX, (int)y - (int)Engine.sY, (int)x + width - (int)Engine.sX, (int)y + height - (int)Engine.sY, id[0] * Tile.tileSize - (int)Engine.sX, id[1] * Tile.tileSize - (int)Engine.sY, id[0] * Tile.tileSize + Tile.tileSize, id[1] * Tile.tileSize + Tile.tileSize, null);
		}
	}
 
}

Tile

package net.wolfgamingdev.minecraftplatformer;
 
import java.awt.image.*;
import javax.imageio.ImageIO;
import java.io.*;
 
public class Tile {
	public static int tileSize = 20;
 
	public static int[] air = {-1, -1};
	public static int[] earth = {0, 0};
 
	public static int[] character = {0, 18};
 
	public static BufferedImage tileset_terrain;
 
	public Tile() {
		try {
			Tile.tileset_terrain = ImageIO.read(new File("res/tileset_terrain.png"));
		} catch(Exception e) { }
 
	}
}

Player

package net.wolfgamingdev.minecraftplatformer;
 
import java.awt.*;
 
public class Player extends DoubleRectangle {
	public double fallingSpeed = 1.3;
 
	public Player(int width, int height) {
		setBounds((Engine.pixel.width/2) - (width / 2), (Engine.pixel.height/2) - (height / 2), width, height);
	}
 
	public void tick() {
		y += fallingSpeed;
		Engine.sY += fallingSpeed;
	}
 
	public void render(Graphics g) {
		g.drawImage(Tile.tileset_terrain, (int)x - (int)Engine.sX, (int)y - (int)Engine.sY, (int)(x + width) - (int)Engine.sX, (int)(y + height) - (int)Engine.sY, Tile.character[0] * Tile.tileSize, Tile.character[1] * Tile.tileSize, Tile.character[0] * Tile.tileSize + (int)width, Tile.character[1] * Tile.tileSize + (int)height, null);
	}
}

DoubleRectangle

package net.wolfgamingdev.minecraftplatformer;
 
public class DoubleRectangle {
	public double x, y, width, height;
 
	public DoubleRectangle() {
		setBounds(0, 0, 0, 0);
	}
 
	public DoubleRectangle(double x, double y, double width, double height) {
		setBounds(x, y, width, height);
	}
 
	public void setBounds(double x, double y, double width, double height) {
		this.x = x;
		this.y = y;
		this.width = width;
		this.height = height;
	}
}

Yes but I don't know how, just removing the static part, it doesn't show anything when I try to run it.

That is exactly my problem. And that's all I did was remove static .

Alright, how can I make it not use static?

Yes and I'm having problems there too -__-

Here's where I put the println (Because when I tried putting it in the original tick function, it wouldn't allow me to access the block variables because they weren't static... )

Block.class

package net.wolfgamingdev.minecraftplatformer;
 
import java.awt.*;
 
public class Block extends Rectangle {
	private static final long serialVersionUID = 1L;
 
	public int[] id = {-1, -1};
 
	public Block(Rectangle size, int[] id) {
		setBounds(size);
		this.id = id;
	}
 
	public void tick() {
		System.out.println(y + width - Engine.sY);
	}
 
	public void render(Graphics g) {
		if(id != Tile.air) {
			g.drawImage(Tile.tileset_terrain, (int)x - (int)Engine.sX, (int)y - (int)Engine.sY, (int)x + width - (int)Engine.sX, (int)y + height - (int)Engine.sY, id[0] * Tile.tileSize - (int)Engine.sX, id[1] * Tile.tileSize - (int)Engine.sY, id[0] * Tile.tileSize + Tile.tileSize, id[1] * Tile.tileSize + Tile.tileSize, null);
		}
	}
}

And Engine.class

package net.wolfgamingdev.minecraftplatformer;
 
import java.applet.*;
import java.awt.*;
import javax.swing.*;
 
public class Engine extends Applet implements Runnable {
	private static final long serialVersionUID = 1L;
 
	private static int pixelSize = 2;
	public static double sX = 0, sY = 0;
 
	public static Dimension size = new Dimension(700,560);
	public static Dimension pixel = new Dimension(size.width / pixelSize, size.height / pixelSize);	
 
	public static String name = "Minecraft 2D!";
 
	public static boolean isRunning = false;
 
	private Image screen;
 
	public static Level level;
	public static Player player;
	public static Block block;
 
	//BLERRRGH
	public Engine() {
		setPreferredSize(size);
	}
 
	public void start() {
		//Defining Objects
		new Tile(); //Loading images
		level = new Level();
		player = new Player(Tile.tileSize, Tile.tileSize * 2);
 
		//Starting Game Loop
		isRunning = true;
		new Thread(this).start();
	}
 
	public void stop() {
		isRunning = false;
	}
 
	public static void main(String args[]) {
		Engine engine = new Engine();
 
		JFrame frame = new JFrame();
		frame.add(engine);
		frame.pack();
		frame.setTitle(name);
		frame.setResizable(false);
		frame.setLocationRelativeTo(null);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
 
		engine.start();
 
	}
 
 
	public void tick() {
		level.tick();
		player.tick();
		block.tick();
	}
 
	public void render() {
		Graphics g = screen.getGraphics();
 
		//Drawing Things
		g.setColor(new Color(100, 100, 255));
		g.fillRect(0, 0, pixel.width, pixel.height);
 
		level.render(g);
		player.render(g);
 
		g = getGraphics();
 
		g.drawImage(screen, 0, 0, size.width, size.height, 0, 0, pixel.width, pixel.height, null);
		g.dispose();
	}
 
	public void run() {
		screen = createVolatileImage(pixel.width,pixel.height);
 
		while(isRunning) {
			tick();
			render();
 
			try {
				Thread.sleep(5);
			} catch(Exception e) { }
		}
	}
}

My error :p

Exception in thread "Thread-2" java.lang.NullPointerException
at net.wolfgamingdev.minecraftplatformer.Engine.tick( Engine.java:66)
at net.wolfgamingdev.minecraftplatformer.Engine.run(E ngine.java:89)
at java.lang.Thread.run(Thread.java:722)


I really do hate being such a bother :/

public void tick() {
System.out.println(y + height - Engine.sY);
}
this is the function line 66 is referring too..