I am fairly new to Greenfoot and I am trying to make a turret that will attack the nearest unit.class within a set area, I know that the following will be used:
getObjectsInRange(_radius_, _cls_)
B_rob1 wrote ...
2018/5/5
[Help] Turret Aiming within range
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public class TurretPlatform extends Actor
{
public boolean deployed = false;
public void act()
{
buyTurret();
}
public void buyTurret()
{
if (Greenfoot.mouseClicked(this) == true && deployed == false)
{
getWorld().addObject(new Turret(), getX(), getY());
deployed = true;
}
}
}
Try doing this:
This creates a list of all units in the given radius, so the nearest unit is stored in the list at 0. If there is an object close by, get that objects x and y positions, and aim at it.
You'll need to specify an int "radius", the radius around the turret
This method, findClosestInRange(), should be called from act();
Additionally, you'll need to add the line: import java.util.List; on the line after import greenfoot.*;
you can add code in a separate method to attack the units.
//in Turret class
public void findClosestInRange()
{
List<unit> units = getObjectsInRange(radius, unit.class
if(units.size != 0)
{
int unitX = units.get(0).getX();
int unitY = units.get(0).getY();
turnTowards(unitX, unitY);
}
}jamesN616 wrote...
Try doing this:
//in Turret class
public void findClosestInRange()
{
List<unit> units = getObjectsInRange(radius, unit.class
if(units.size != 0)
{
int unitX = units.get(0).getX();
int unitY = units.get(0).getY();
turnTowards(unitX, unitY);
}
}units.size() returns the number of objects in the list units
"!=" means does not equal, so if the list doesn't have anything in it, then the turret doesn't need to aim anywhere.
Another tricky thing is that if one object is in range, the units.size() will be 1, but that unit is stored at index 0.
Also, in my carelessness, I neglected to add parentheses after size. Should look like ..."units.size()"...
jamesN616 wrote...
units.size() returns the number of objects in the list units
"!=" means does not equal, so if the list doesn't have anything in it, then the turret doesn't need to aim anywhere.
Another tricky thing is that if one object is in range, the units.size() will be 1, but that unit is stored at index 0.
Also, in my carelessness, I neglected to add parentheses after size. Should look like ..."units.size()"...@jamesN616 Thanks for the help so far, but what can i do to call my
public int Money = 10;
from MyWorld to TurretPlatform.class
for the purpose of checking if the Money is enough to purchase and to subtract money after the purchase
There's a lot going on here, but I think this is what you're trying to do:
//In world
//in act
public boolean getMoney()
{
if(Greenfoot.getMouseInfo() != null)
{
int X = Greenfoot.getMouseInfo().getX();
int Y = Greenfoot.getMouseInfo().getX();
List<TurretPlatform> platforms = getObjectsAt(X,Y);
if(platforms.size() != 0)
{
TurretPlatform platform = (TurretPlatform) platforms.get(0);
if(Money >= 10)
{
platform.buyTurret();
}
}
}
}
//not in act
public void countMoney(int dollars)
{
Money = Money + dollars;
}
//in TurretPlatform
//in act
public void changeMoney(int dollars)
{
MyWorld world = (MyWorld) getWorld();
world.countMoney(dollars);
}In the world's act method, you'll check if the mouse is touching the turret platform. You do this by getting a list of turrets that the mouse is on, and converting the first turret platform into an actor, so that we can call methods in only the one we're touching. From earlier, your "buyTurret()" method looks like it adds a new turret when run, so we'll call that method from the world when the mouse clicks on it.
Also in the world, we have a method to keep track of how much money we're spending/gaining
In turret platform, we have a method to call the world's countMoney() method, while specifying the amount, + or - to be added. You can call this method and specify the change in money in the method parameters wherever you're changing the amount of money
In the world, you'll also need to add the import java.util.List; to get the List library
Another amendment: changeMoney(int dollars) in TurretPlatform shouldn't be in act(), it should be with however you're changing money
jamesN616 wrote...
Another amendment: changeMoney(int dollars) in TurretPlatform shouldn't be in act(), it should be with however you're changing moneyjamesN616 wrote...
There's a lot going on here, but I think this is what you're trying to do:
//In world
//in act
public boolean getMoney()
{
if(Greenfoot.getMouseInfo() != null)
{
int X = Greenfoot.getMouseInfo().getX();
int Y = Greenfoot.getMouseInfo().getX();
List<TurretPlatform> platforms = getObjectsAt(X,Y);
if(platforms.size() != 0)
{
TurretPlatform platform = (TurretPlatform) platforms.get(0);
if(Money >= 10)
{
platform.buyTurret();
}
}
}
}
//not in act
public void countMoney(int dollars)
{
Money = Money + dollars;
}
//in TurretPlatform
//in act
public void changeMoney(int dollars)
{
MyWorld world = (MyWorld) getWorld();
world.countMoney(dollars);
}jamesN616 wrote...
jamesN616 wrote...
Another amendment: changeMoney(int dollars) in TurretPlatform shouldn't be in act(), it should be with however you're changing moneyThere are more replies on the next page.
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