hello, im sorta new to greenfoot, and Im having trouble getting the API, im currently trying to program a tank that can track your movements
manish1 wrote ...
2013/5/19
can someone please help?
What exactly do you want your tank to do?
ok, actually now i have somthing going:
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
import java.util.List;
import java.util.ListIterator;
/**
* Write a description of class greenTank here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class greenTank extends platformMover
{
/**
* Act - do whatever the greenTank wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public void act()
{
turnTowardTank();
int distance = (int)(Math.random()*5)+1;
move(distance);
}
public void turnTowardTank()
{
World world = getWorld();
List<Tank> tank = world.getObjects(Tank.class);
ListIterator<Tank> iter = tank.listIterator();
if(iter.hasNext())
{
}
Tank enemy = iter.next();
int eX = enemy.getX();
int y = getY();
int x = getX();
int angle = getRotation();
if(x < eX)
{
if(angle == 180)
{
turn();
}
else if(x > eX)
{
if(angle == 0)
{
turn();
}
}
}
}
public void turn()
{
GreenfootImage img = getImage();
img.mirrorVertically();
setImage(img);
turn(180);
}
}
well, i just want my tank to go after my character and shoot at it every few seconds or so
when i compile the above code, the tank only moves forward not track my movements and come after me, it doesnt shoot either.
Your turnTowardsTank method doesn't tell the tank to move to your character.
Try this method:
If your character is named different you will have to change that.
For your shooting problem you could use this method:
public void turnTowardsCharacter() {
List<Character> characters = getWorld().getObjects(Character.class);
if (characters != null && !characters.isEmpty()) {
Character character = characters.get(0);
turnTowards(character.getX(), character.getY());
}
}//you first need a global variable;
private long time = System.currentTimeMillis();
public void shootAtCharacter() {
if (System.currentTimeMillis() - time > 3000) {
//this will make your tank shoot every 3 seconds. If you change the value in the if statement you can change the time.
time = System.currentTimeMillis();
getWorld().addObject(new Bullet(getRotation()), getX(), getY());
}
}
//to use this method you now need the class Bullet;
//If you already got a class similar to this you just have to change the constructor;
//you just need the constructor of this class;
//If you need help concerning the rest of the class just ask.
public Bullet(int rotation) {
setRotation(rotation);
}Thanks for ur reply!
so when i compile the turnTowardsTank method it gives me this error:
Non- static method getX() cannot be referenced from a static context
and it highlights the Tank.getX() part
Any ideas on how to fix this?
There's no Tank.getX() part in the code listed above? If you modified the code, post it!
You probably did this:
If so you just have to change the line turnTowards(... into
public void turnTowardsCharacter() {
List<Tank> tanks = getWorld().getObjects(Tank.class);
if (tanks != null && !tanks.isEmpty()) {
Tank tank = tanks.get(0);
turnTowards(Tank.getX(), Tank.getY());
}
} turnTowards(tank.getX(), tank.getY());
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