LWJGL Orthographic Sidescroller Camera

Engines, Libraries and Tools
#1

Hi,

For my game I am making I am trying to implement an orthographic camera to sidescroll, currently the camera just stays still and I cant seem to work out the best way to sidescroll (ideally attached to a entity(e.g. the player))

This is the only camera code I have right now:

GL11.glOrtho(0.0f, width, height, 0.0f, 1.0f, -1.0f);

Thanks,

  • Dan
#2

Just translate everything to player.x - viewport.width/2, player.y - viewport.height/2, example:


glTranslatef(player.x - vp.width/2, player.y - vp.height/2, 0);
#3

[icode]glOrtho()[/icode] just defines the projection matrix to use an orthographic projection. To translate, you need to use the [icode]glTranslatef()[/icode] function.

#4

I’d leave the camera alone and move the world data.

#5

Yeah I tried that too, didnt seem to work the way I was doing it for some reason :confused:

package Logic;

import org.lwjgl.input.Keyboard;

public class WorldLogic {

	public static double x;
	public static double y;
	public static double xspeed;

	public WorldLogic() {
		glTranslatef(player.x - vp.width/2, player.y - vp.height/2, 0);
		x = 20;
		y = 0;
		//World scrolling speed
		xspeed = 0.4;
	}
	
	public void logic() {
		x+=xspeed;
		input();
	}
	
	
	public static void input() {
		if(Keyboard.isKeyDown(Keyboard.KEY_A)) {
			xspeed = xspeed * 0.4;
		}
		System.out.println("Press Left");
		if(Keyboard.isKeyDown(Keyboard.KEY_D)) {
			xspeed = xspeed * 0.4;
		}
		System.out.println("Press Right");
	}
}

Thanks,

  • Dan
#6

You don’t have the variables player and vp defined. Make a player class with member variable floats x, y and make a viewport class with member variable floats width and height.

Also your logic slows down the player when they press the keys. Shouldn’t you be speeding him up?

#7

Yeah instead of a viewport im just using the Display, but it still doesn’t like it, like this:

GL11.glTranslated(MainPlayer.x - Display.getWidth()/2, MainPlayer.y - Display.getHeight()/2, 0);

Also just a side note, my player physics are upside down :confused: Player:
http://pastebin.java-gaming.org/c2afe35318c

Thanks,

  • Dan
#8

@GamerIDGoesHere

Why are you using [icode]static[/icode] for your player class methods?

#9

Cant remember, but it was something to do with when trying to draw the player, the code got mad at me for not having them static, so I made them static :confused:

Sorry for my lack of elaboration, it was a while ago when I did it, I haven’t needed to try and use the class until now,

Thanks,

  • Dan
#10

where did you put the translate code?

#11

In WorldLogic:

package Logic;

import org.lwjgl.input.Keyboard;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.GL11;

import Player.MainPlayer;

public class WorldLogic {

	public static double x;
	public static double y;
	public static double xspeed;

	public WorldLogic() {
		GL11.glTranslated(MainPlayer.x - Display.getWidth()/2, MainPlayer.y - Display.getHeight()/2, 0);
		x = 20;
		y = 0;
		//World scrolling speed
		xspeed = 0.4;
	}
	
	public void logic() {
		x+=xspeed;
		input();
	}
	
	
	public static void input() {
		if(Keyboard.isKeyDown(Keyboard.KEY_A)) {
			xspeed = xspeed * 0.4;
		}
		System.out.println("Press Left");
		if(Keyboard.isKeyDown(Keyboard.KEY_D)) {
			xspeed = xspeed * 0.4;
		}
		System.out.println("Press Right");
	}
}

Should it be somewhere else?

Thanks for your help, and Renoria is looking pretty neat :),

  • Dan
#12

My player stays still :cranky: , can this be explained a bit more in depth.