I cannot tell what you have where. I can tell that the Space class act method is shown last and it is quite obvious that shown first is the Invader class constructor; but, what Actor subclass did you put the moveRow method in
Notted wrote ...
2019/5/1
Change an images color.
Do you need more context?
Space:
Invader:
Player:
Row:
public class Space extends World
{
Row[] rows = new Row[8];
int timer, direction, level = 1;
boolean drop;
public Space()
{
super(450, 500, 1);
prepare();
}
private void prepare()
{
removeObjects(getObjects(null));
for (int j=0; j<3+level; j++)
{
rows[j] = new Row();
addObject(rows[j], 225, 25+j*50);
for (int i=0; i<3; i++) addObject(new Invader(Color.RED, 10, 5), 50+i*50, 20+j*50);
}
addObject(new Player(Color.WHITE), 30, 475);
timer = 0;
direction = 1;
drop = false;
}
public void act()
{
if (timer == 0 && drop)
{
for (int i=0; i<3+level; i++)
{
rows[i].dropRow();
drop = false;
}
direction = -direction;
}
if (timer%3 == 0 && timer < 3*(3+level)) drop = rows[timer/3].moveRow(direction) || drop;
timer = (timer+1)%32;
if (getObjects(Invader.class).isEmpty())
{
if (level < 5) level++;
prepare();
}
if (getObjects(Player.class).isEmpty()) prepare();
}
}public class Invader extends Actor
{
public Invader(Color invaderColor, int invaderX, int invaderY)
{
GreenfootImage image = new GreenfootImage(invaderX, invaderY);
image.setColor(invaderColor);
image.fill();
setImage(image);
}
public boolean moveInvader(int dir)
{
setLocation(getX()+dir*5, getY());
return getX() < 20 || getX() > getWorld().getWidth()-20;
}
public void act()
{
Actor player = getOneIntersectingObject(Player.class);
if (player != null) getWorld().removeObject(player);
if (Greenfoot.getRandomNumber(80) == 0) shoot();
}
private void shoot()
{
int dist = getWorld().getHeight()-getY();
Feeler feeler = new Feeler();
feeler.setImage(new GreenfootImage(1, dist));
getWorld().addObject(feeler, getX(), getY()+dist/2+30);
int count = feeler.invaderCount;
getWorld().removeObject(feeler);
if (count == 0)
{
Bullet bullet = new Bullet(Color.RED);
bullet.setRotation(90);
getWorld().addObject(bullet, getX(), getY());
bullet.move(15);
}
}
public class Feeler extends Actor
{
public int invaderCount;
public void addedToWorld(World w)
{
invaderCount = getIntersectingObjects(Invader.class).size();
}
}public class Player extends Actor
{
int shotTimer;
public Player(Color playerColor)
{
GreenfootImage image = new GreenfootImage(29, 15);
image.setColor(playerColor);
int[] xs = { 0, 3, 12, 14, 16, 25, 28 };
int[] ys = { 14, 4, 4, 0, 4, 4, 14 };
image.fillPolygon(xs, ys, 7);
setImage(image);
}
public void act()
{
runShotTimer();
int dx = 0;
if (Greenfoot.isKeyDown("left")) dx--;
if (Greenfoot.isKeyDown("right")) dx++;
if (dx == 0 || getX()+dx < 15 || getX()+dx > getWorld().getWidth()-16) return;
move(dx);
}
private void runShotTimer()
{
if (shotTimer > 0) shotTimer--;
if (shotTimer > 0) return;
if (Greenfoot.isKeyDown("space"))
{
Bullet bullet = new Bullet(Color.WHITE);
bullet.setRotation(270);
getWorld().addObject(bullet, getX(), getY());
bullet.move(10);
shotTimer = 60;
}
}
}public class Row extends Actor
{
public Row()
{
setImage(new GreenfootImage(450, 1));
}
public boolean moveRow(int dir)
{
boolean changeDir = false;
for (Object obj : getIntersectingObjects(Invader.class))
{
Invader invader = (Invader) obj;
changeDir = invader.moveInvader(dir) || changeDir;
}
return changeDir;
}
public void dropRow()
{
for (Object obj : getIntersectingObjects(Invader.class))
{
Actor invader = (Invader) obj;
invader.setLocation(invader.getX(), invader.getY()+10);
}
setLocation(getX(), getY()+10);
}
}
It would help if you placed your invaders on their rows. Apparently, you adjusted the vertical starting position of where invaders start; but you did not adjust the vertical starting position of the rows.
Notted wrote...
So set the Y of the rows equal to the invaders?danpost wrote...
Notted wrote...
So set the Y of the rows equal to the invaders?Notted wrote...
Should I use some sort of reference for the invaders Y position in order to make it set equal to that pos?Ok. What I want now is to create invaders with different attributes, like HP and speed. These will be placed on individual rows, with bottom ones being of the lowest type. How could I do this?
Notted wrote...
I want now is to create invaders with different attributes, like HP and speed. These will be placed on individual rows, with bottom ones being of the lowest type. How could I do this?Notted wrote...
I'm not sure what to do exactly.My way will probably involve an int. Many games choose enemy types randomly in that way, so I'll do the same.
This works towards getting enemy types to spawn.
Now we need to have some sort of way to implement health into the game. One of them would be to use this method:
in the bullet Actor to it.
public Invader(int invaderType)
{
int invaderHP = 0;
if (invaderType == 1)
{
GreenfootImage image = new GreenfootImage(5, 10);
image.setColor(Color.RED);
image.fill();
setImage(image);
invaderHP = 1;
}
else if (invaderType == 2)
{
GreenfootImage image = new GreenfootImage(7, 12);
image.setColor(Color.BLUE);
image.fill();
setImage(image);
invaderHP = 2;
}
else if (invaderType == 3)
{
GreenfootImage image = new GreenfootImage(9, 14);
image.setColor(Color.ORANGE);
image.fill();
setImage(image);
invaderHP = 3;
}
else if (invaderType == 4)
{
GreenfootImage image = new GreenfootImage(11, 16);
image.setColor(Color.YELLOW);
image.fill();
setImage(image);
invaderHP = 4;
}
}if (getRotation() == 270)
{
Actor invader = getOneIntersectingObject(Invader.class);
if (invader != null)
{
world.removeObject(invader);
world.removeObject(this);
}
else if (getY() == 0) world.removeObject(this);
}
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