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cake_9098
cake_9098 wrote ...

2022/1/19

Help with platform game!

cake_9098 cake_9098

2022/1/19

#
Hi, so I'm making a pretty simple platform game with 3 different types of platforms and 1 moving platform. The problem I'm having is that when I'm jumping to other platforms, when I sometimes go off the platform the "gravity" does not work like my actor will just be walking on air. It seems to be happening with 2 platforms only and I'm not sure why.
?
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import greenfoot.*;  // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
 
/**
 * Write a description of class Riggy here.
 *
 * @author (your name)
 * @version (a version number or a date)
 */
public class Riggy extends Actor
{
 
 
    private int vSpeed = 0;
    private int acceleration = 1;
 
    /**
     * Riggy Constructor
     *
     */
    public Riggy()
    {
 
    }
 
    /**
     * Act - do whatever the Riggy wants to do. This method is called whenever
     * the 'Act' or 'Run' button gets pressed in the environment.
     */
    public void act()
    {
        // Add your action code here.
        checkKeys();
        onLadder();
        fall();
 
    }
 
    public void checkKeys()
    {
        if(Greenfoot.isKeyDown("left"))
        {
            move(-5);
        }
 
        if(Greenfoot.isKeyDown("right"))
        {
            move(5);
        }
 
        if(Greenfoot.isKeyDown("space") && onPlatform1() || Greenfoot.isKeyDown("space") && onPlatform2() || Greenfoot.isKeyDown("space") && onPlatform3() || Greenfoot.isKeyDown("space") && onmovingPlatform())
        {
            jump();
        }
 
    }
 
    public void jump()
    {
        vSpeed = -10;
 
    }
 
    public void fall()
    {
        setLocation(getX(), getY() + vSpeed);
        if(onPlatform1())
        {  
            vSpeed = 0;
        } else if (onPlatform2()) {
            vSpeed = 0;
        } else if(onPlatform3()) {
            vSpeed = 0;
        } else if (onmovingPlatform()) {
            vSpeed = 0;
        } else {
            vSpeed = vSpeed + acceleration;
        }
 
    }
     
 
    public boolean onPlatform1()
    {
        Actor under = getOneObjectAtOffset(0 , getImage().getHeight()/ 2 - 8, platform1.class);
        return under != null;
 
    }
 
    public boolean onPlatform2()
    {
        Actor under = getOneObjectAtOffset(0 , getImage().getHeight()/ 2 - 8, platform2.class);
        return under != null;
 
    }
 
    public boolean onPlatform3()
    {
        Actor under = getOneObjectAtOffset(0 , getImage().getHeight()/ 2 - 8 , platform3.class);
        return under != null;
 
    }
 
    public boolean onmovingPlatform()
    {
        Actor under = getOneObjectAtOffset(0 , getImage().getHeight()/ 2 - 8, movingPlatform.class);
        return under != null;
 
    }
     
 
    public void onLadder()
    {
        ladder ld = (ladder)getOneIntersectingObject(ladder.class);
        if(ld != null && Greenfoot.isKeyDown("up"))
        {  
            vSpeed = 0;
            setLocation(getX(), getY() - 5);
 
        }
    }
 
}
I'll post my code but it might be a bit tricky to understand. hopefully someone can help me! thanks.
danpost danpost

2022/1/19

#
Make sure your platform images do not have any excess transparencies in them. The player is considered "on" a platform if it touches any part of the image of the platform, including any transparent part of the image. Neither should the image of the player have any excess transparencies.
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