Hi,
I've been using this project : Click as a basis for creating a game that has a helicopter that flies around saving people. It has a 2D-sidescrolling effect.
For the Y, I made sure the Character does not go below or above the screen. So I check the Y of the Character and make sure it does not go below or above certain values. The problem is that I don't know how to check this with the X. Because the Object is always centered in the middle, it will always be 375. Even though it does actually move about a thousand pixels to the left. For the background it actually did work, but that same check does not on the Character.
The goal of checking X is making sure it does not go beyond the background. If the Character has reached the end of the background I want it to stop scrolling and the Character to move until the border so that you will never see beyond the background.
I was wondering if somebody could help me, thanks in advance.
Here is the code:
World class : achtergrond (Dutch for background):
The background actor (background image is 2000x750):
And finally the code of the Character:
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class achtergrond here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class achtergrond extends World
{
/**
* Constructor for objects of class achtergrond.
*
*/
public achtergrond()
{
super(750, 750, 1, false);
populate();
}
/**
* Prepare the world for the start of the program. That is: create the initial
* objects and add them to the world.
*/
/**
* Prepare the world for the start of the program. That is: create the initial
* objects and add them to the world.
*/
public void act()
{
uman um=(uman) getObjects(uman.class).get(0); //GETS THE ACTOR
int dx = um.getX()-getWidth()/2; // CALCULATES THE MIDDLE
for(Object obj : getObjects(null)) // NO IDEA
{
Actor actor=(Actor)obj; // NO IDEA
actor.setLocation(actor.getX()-dx, actor.getY()); // KEEPS SETTING THE ACTOR IN THE MIDDLE
}
}
public void populate() //CREATES BACKGROUND AND NEW ACTOR
{
background background = new background();
addObject(background, 600, 375);
uman uman = new uman();
addObject(uman, 200, 335);
}
}import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class background here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class background extends Actor
{
private int speed = 6; //SETS SPEED
public void act()
{
checkKeys();
}
private void checkKeys() //MOVES VIA KEYBOARD INPUT
{
int checkX = getX();
System.out.println(checkX);
if(checkX >= -240){
if (Greenfoot.isKeyDown("right"))
{
setLocation(getX()-speed,getY());
}
}
if(checkX <= 985){
if(Greenfoot.isKeyDown("left"))
{
setLocation(getX()+speed,getY());
}
}
}
}
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class uman here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class uman extends Actor
{
private int speed = 6; //SETS SPEED
public void act()
{
imageChanger();
checkKeys();
}
private void imageChanger()
{
if (Greenfoot.isKeyDown("left"))
{
setImage("Player_groot_links.png");
}
if (Greenfoot.isKeyDown("right"))
{
setImage("Player_groot_rechts.png");
}
}
private void checkKeys() // MOVES VIA KEYBOARD INPUT
{
int checkY = getY();
if (Greenfoot.isKeyDown("left")){
setLocation ( getX() - speed, getY() );
setImage("Player_groot_links.png");
}
if (Greenfoot.isKeyDown("right")){
setLocation ( getX() + speed, getY() );
setImage("Player_groot_rechts.png");
}
if(checkY >= 45){
if(Greenfoot.isKeyDown("up")){
setLocation ( getX(), getY() - speed );
}
}
if(checkY <= 710){
if( Greenfoot.isKeyDown("down")){
setLocation (getX(), getY() + speed );
}
}
}
}