Greenfoot

kiarocks

2011/6/26

#

"cannot find constructor person"-im overwhelmed

danpost

2011/6/26

#

You should already have one constructor:

public void Person()
{
    ...
}

to be called with

int randomX = Greenfoot.getRandomNumber(getWorld().getWidth()); 
int randomY = Greenfoot.getRandomNumber(getWorld().getHeight());
addObject(new Person(), randomX, randomY);

In the above, replace 'getWorld().getWidth()' with the actual value for the width of InfectWorld; and, replace 'getWorld().getHeight()' with the actual value for the height of InfectWorld Then: You need to create (add) ANOTHER constructor:

public void Person(int myAge, int myInfectStage)
{
    ...
}

to be called with

addObject(new Person(myAge, myInfectStage), randomX, randomY);

For the variables 'myAge' and 'myInfectStage', which values can be set to in any number of ways, I suggest:

int myAge = Greenfoot.getRandomNumber(100);
int myInfectStage = 0; // If you want to create a Person who is already infected, change '0', to '1' or '2' (whatever stage)

kiarocks

2011/6/26

#

where should i put " int myAge = Greenfoot.getRandomNumber(100); int myInfectStage = 0; // If you want to create a Person who is already infected, change '0', to '1' or '2' (whatever stage) int x = Greenfoot.getRandomNumber(getWorld().getWidth()); // Use the actual width of InfectWorld, since you know it int y = Greenfoot.getRandomNumber(getWorld().getHeight()); // Again, use the actual height of InfectWorld "???

danpost

2011/6/26

#

As far as

kiarocks wrote...

"cannot find constructor person"

Possibly you need to use 'Person' (with a capital P) or maybe you need parenthesis: 'new Person()' when calling.

kiarocks

2011/6/26

#

acctually it is

cannot find symbol- constructor Person(int, int)

danpost

2011/6/26

#

The first two lines:

int myAge = Greenfoot.getRandomNumber(100);  
    int myInfectStage = 0; // If you want to create a Person who is already infected, change '0', to '1' or '2' (whatever stage)

should be immediately before

addObject(new Person(myAge, myInfectStage), x, y);

when used in InfectWorld.class; and immediately before

getWorld().addObject(new Person(myAge, myInfectStage), x, y);

when used in Person.class. The 'int x' and 'int y' assignment statements are only used (before the same call of 'new Person(int, int)' when you are placing the Person randomly in the world. When a new (child birth) Person is added to the world, you would want to use the getX() and getY() functions on the mother to determine where to place the child in the world. And again, for 'int x' and 'int y', since you know the width and height of the world, use the actual numbers instead of 'getWorld().getWidth()' and 'getWorld().getHeight()'

danpost

2011/6/26

#

Did you create a new constructor in Person?

public Person(int myAge, int myInfectStage)
{
    ...
}

kiarocks

2011/6/26

#

yes

danpost

2011/6/26

#

In what class did you write the code

addObject(new Person(int, int), x, y);

and show me the whole statement.

kiarocks

2011/6/26

#

public void act() // In 'Person.class' { { if (isPregnant) { howLongTillDue--; if (howLongTillDue == 0) { int myAge = Greenfoot.getRandomNumber(100); int myInfectStage = 0; getWorld().addObject(new Person(0, 0), getX(), getY()); isPregnant = false; } } }

kiarocks

2011/6/26

#

erm, means

    int myAge = Greenfoot.getRandomNumber(100);    
        int myInfectStage = 0; // If you want to create a Person who is already infected, change '0', to '1' or '2' (whatever stage)

is in world class

danpost

2011/6/26

#

Try eliminating 'getWorld().' in the call statement, if that does not work, check you brackets (it looks like you have an extra one before 'if (isPregnant)'

danpost

2011/6/26

#

I will have to test it out (later); I have to go right now; but, will be back in a few hours!

kiarocks

2011/6/26

#

note above!

kiarocks

2011/6/26

#

oh, ok

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