Greenfoot

Zwemvis

2019/12/30

#

Hoi Greenfoot users. I have to ask a question. How to put a instruction in the World/Actor to remove something that is not yet in the world, but later will be...... Now i get an error, when i enter the code. Alvast bedankt voor de de medewerking. Groet Ruard

danpost

2019/12/30

#

Zwemvis wrote...

Hoi Greenfoot users. I have to ask a question. How to put a instruction in the World/Actor to remove something that is not yet in the world, but later will be...... Now i get an error, when i enter the code.

What error? -- What code? To remove something (at some point) that may or may not be in the world, you can still request it be removed with:

Actor something = ???; // the actor to remove

removeObject(something); // in World subclass
// or
getWorld().removeObject(something); // in Actor subclass

Zwemvis

2019/12/30

#

the error is " cannot find symbol variable Fire", if i put the code removeObejct(Fire); in the World subclass or getWorld().removeObejct(Fire); in the Actor subclass. I want to put a message on the screen, and after 10 seconds remove it again.

danpost

2019/12/30

#

Zwemvis wrote...

the error is " cannot find symbol variable Fire", if i put the code removeObejct(Fire); in the World subclass or getWorld().removeObejct(Fire); in the Actor subclass. I want to put a message on the screen, and after 10 seconds remove it again.

I must presume that Fire is a class name -- not a variable that is an Object reference to an instance of the Fire class (an actor created from the Fire class). A class (an Object of type Class) is never in a world -- only Actor instances are. Still, not enough code has been provided to afford any assistance.

Zwemvis

2019/12/30

#

you are right. Fire is a class name, but wen i put in de code, it will gives the error that I described above. this is part of code i am talking about. public void raakBlad() { MyWorld myWorld = (MyWorld)getWorld(); if(isTouching(Blad1.class)) { if (vuur == 1){ myWorld.addObject(new Fire(200,200),300,200); imageCounter = (++imageCounter)%20; myWorld.removeObject(Fire); vuur = 0; } } } Thanks for the support.

danpost

2019/12/30

#

Zwemvis wrote...

you are right. Fire is a class name, but wen i put in de code, it will gives the error that I described above. this is part of code i am talking about. << Code Omitted >>

Move counter and code to remove Fire instance to the Fire class. Use:

getWorld().removeObject(this);

Zwemvis

2019/12/31

#

Hoi Danpost Thanks for your help :-) Bedankt voor je hulp.

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A question. how to remove