Greenfoot

Sakuya

2021/1/10

#

Im making a Touhou parody in Greenfoot but my Charackter can fly to the scoreboard is there a code where I can adjust the space where all charackter are able to spawn/move?

FirewolfTheBrave

2021/1/10

#

I don't know what your project will exactly look like, but let's assume you're going to restrict your character's spawning and movement to the area between x=100 and x=300 horizontally and y=100 and y=300 vertically. To restrict the spawning area, use this code in the spawning method (if it's in an Actor subclass, add getWorld(). between the this. and AddObject()):

this.addObject(new <class name>, Greenfoot.getRandomNumber(200) + 100, Greenfoot.getRandomNumber(200) + 100);

To restrict the character movement, use this code in the character's movement method:

int newX = <code to calculate the next x-coordinate>;
int newY = <code to calculate the next  y-coordinate>;
if (newX > 100 && newX < 300 && newY > 100 && newY < 300) this.setLocation(newX, newY);

As I mentioned, his code will restrict your character to the area between x=100 and x=300 horizontally and y=100 and y=300 vertically. You can adjust the numbers however you want.

Sakuya

2021/1/11

#

Ok but what do you write where you tipped code to calculate the next x/y coordinates ?

danpost

2021/1/11

#

Sakuya wrote...

Ok but what do you write where you tipped code to calculate the next x/y coordinates ?

That would depend on the individual types of Actor and how the instances of each move.

Sakuya

2021/1/11

#

I dont quite understand im new to this so I tryed to use the code but it dosnt work my world is scaled 800x600 and I kinda want the charackters movement to be at 50-500 x and 50-550 y. I dont fully understandt what you mean but i can move my charackter with wasd around the whole world and i want his movement to be scaled in the lenght I named. I hope anything I wrote made sense, sorry english is not my native language and I dont fully understand what you guys mean

danpost

2021/1/11

#

Sakuya wrote...

I kinda want the charackters movement to be at 50-500 x and 50-550 y. ... but i can move my charackter with wasd around the whole world

First, collect key data to determine intended direction of movement along horizontal and vertical:

int dx =0, dy = 0;
if (Greenfoot.isKeyDown("d")) dx++;
if (Greenfoot.isKeyDown("a")) dx--;
if (Greenfoot.isKeyDown("s")) dy++;
if (Greenfoot.isKeyDown("w")) dy--;

Next, for 4-way movement, allow only one direction at a time and check range of movement:

if (dx*dy == 0 && dx+dy != 0 // one, and only one, direction is not zero
    && getX()+dx*speed >= 50 && getX()+dx*speed <= 500 // new x allowable
    && getY()+dy*speed >= 50 && getY()+dy*speed <= 550) // new y allowable
{
    setLocation(getX()+dx*speed, getY()+dy*speed);
}

FirewolfTheBrave

2021/1/11

#

Alright, then we'll need to change the code up slightly. Remove your current movement code, then put this bit of code into your character class:

public void move()
{
     int newX = this.getX();
     int newY = this.getY();
     if (Greenfoot.isKeyDown("w")) newY--;
     else if (Greenfoot.isKeyDown("a")) newX--;
     else if (Greenfoot.isKeyDown("s")) newY++;
     else if (Greenfoot.isKeyDown("d")) newX++;
     if (newX > 50 && newX < 500 && newY > 50 && newY < 500) this.setLocation(newX, newY);
}

Call this method by writing

move();

into your act() method. Remove your current spawning code, and put this code into your world constructor:

this.addObject(new <class name>, Greenfoot.getRandomNumber(450) + 50, Greenfoot.getRandomNumber(450) + 50);

This will spawn one character at the very beginning of the game. If you don't like that, leave a reply and I'll change the code for you. Edit: I see that danpost has also replied. Both codes seem to work, so you can pick one.

Sakuya

2021/1/12

#

Thanks, it worked. Cant thank you both enough

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