Greenfoot

MrPancakes

2016/6/14

#

Im making a fake pokemon with a couple of friends of me, and my charachter wont stop moving at 2 certain objects. A tree and a house. I dont know how to make a code of that. Below here is the code.

public void act() 
    {
        if (Greenfoot.isKeyDown ("up") || Greenfoot.isKeyDown ("w"))
        {
            setLocation(getExactX(), getExactY()-moveSpeed);
            setImage("roodkapjeachter.gif");
            if (isTouching(Tree.class))
            {
                move(0);
            } 
        }
        if (Greenfoot.isKeyDown ("down") || Greenfoot.isKeyDown ("s"))
        {
            setLocation(getExactX(), getExactY()+moveSpeed);
            setImage("roodkapjevoor.gif");
            if (isTouching(Obstacle.class))
            {
                move(0);
            } 
        }    
        if (Greenfoot.isKeyDown ("left") || Greenfoot.isKeyDown ("a"))
        {
            setLocation(getExactX()-moveSpeed, getExactY());
            setImage("roodkapjelinks.gif");
            if (isTouching(Tree.class))
            {
                
            } 
        }    
        if (Greenfoot.isKeyDown ("right") || Greenfoot.isKeyDown ("d"))
        {
            setLocation(getExactX()+moveSpeed, getExactY());
            setImage("roodkapjerechts.gif"); 
            if (isTouching(Tree.class))
            {
                move(0);
            }    
        }
    }

I know that i should use the 'move(int)' code but it doesnt work for me somehow.

SPower

2016/6/14

#

You do not need to use the move function. What you do not seem to understand is that "move(0)" does absolutely nothing. It says: "move myself forward 0 cells", which of course, will result in nothing happening. You could negate the changing of the location you've done previously, e.g.:

setLocation(getExactX(), getExactY() -moveSpeed);
// stuff
if (isTouching(Tree.class)) {
    setLocation(getExactX(), getExactY() +moveSpeed);
}

Or you could look at the size of the object being touched, and move the actor back the appropriate amount.

// stuff
if (isTouching(Tree.class)) {
    Actor tree = getOneIntersectingObject(Tree.class);
    int heightTree = tree.getImage().getHeight();
    setLocation(getExactX(), getExactY() +heightTree/2);
}

You'd have to change the positive/negative signs for the different directions (i.e., if you've previously added something to Y, you need to subtract from it to undo the movement), and add/subtract the amount on the x or y direction (also, with x, you'd need to use the width instead of the height of the object). And one simple note: the code I showed (at least, the second snippet) assumed you have a cell size of 1x1 pixel; if that's not the case, you need to divide the width/height of the image by getWorld().getCellSize().

MrPancakes

2016/6/14

#

I fixed it. Thank you. and sorry if I didnt understand it.

SPower

2016/6/14

#

You don't need to apologise for not understanding something; I simply wanted to tell you where I think the issue was (at least partially).

MrPancakes

2016/6/20

#

I also have another problem. I want to change the world from one to another. I know how that works, but the problem is somewhere else. I want to change the world if my character touches something. Can you maybe help me?

danpost

2016/6/20

#

MrPancakes wrote...

I also have another problem. I want to change the world from one to another. I know how that works, but the problem is somewhere else. I want to change the world if my character touches something. Can you maybe help me?

if (isTouching(WhateverActor.class)) Greenfoot.setWorld(new WhateverWorldClass());

MrPancakes

2016/6/20

#

@danpost Do I have to put in the world or in the actor editor?

MrPancakes

2016/6/20

#

oh nevermind. i figured it out. Thanks for the code ;)

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