How do I make my actor object fire a laser beam when spacebar is pressed that continuously moves upwards like in the Atari Centipede game?
CrossX105 wrote ...
2018/4/15
Atari Centipede Laser
CrossX105 wrote...
How do I make my actor object fire a laser beam when spacebar is pressed that continuously moves upwards like in the Atari Centipede game?Not much. Just naming an actor rocket as Laser and moves it to my Tux (basically the player who fires the lasers).
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class Laser here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Laser extends Actor
{
/**
* Act - do whatever the Laser wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public Laser()
{
GreenfootImage rocket = getImage();
rocket.scale(rocket.getWidth()/5, rocket.getHeight()/5);
turn(-90);
}
public void act()
{
if(Greenfoot.isKeyDown("e"))
{
setLocation(Tux.getX(), Tux.getY());
}
}
}
Remove the code within the act method of the Laser class. The initial creation, rotation setting and placement into the world of a Laser object will all be done by the Tux object when the key is pressed. The laser should only move and remove itself when at world edge and maybe explode when it hits something (I do not know what all you plan on).
How will the Laser's attributes (rotation, placement, etc.) be done by a different Actor? In this case, Tux?
CrossX105 wrote...
How will the Laser's attributes (rotation, placement, etc.) be done by a different Actor? In this case, Tux?private void fire()
{
Actor laser = new Laser(); // create laser
laser.setRotation(getRotation()); // set rotation of laser
getWorld().addObject(laser, getX(), getY()); // place laser into world
}Yeah My Laser already appears at a certain location. But during the scenario is playing, how do I address the Tux X and Y? Cuz I want the laser to reappear at the tux and move up etc.
CrossX105 wrote...
Yeah My Laser already appears at a certain location. But during the scenario is playing, how do I address the Tux X and Y? Cuz I want the laser to reappear at the tux and move up etc.So this way, I dont have to track the tux or find its location? It does it automatically. Ohhh...
Thanks a lot! It worked, but now the laser doesn't move independently and only moves up when I HOLD the spacebar. As soon as i let go, the laser stops moving.
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
/**
* Write a description of class Laser here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class Laser extends Actor
{
/**
* Act - do whatever the Laser wants to do. This method is called whenever
* the 'Act' or 'Run' button gets pressed in the environment.
*/
public Laser()
{
GreenfootImage rocket = getImage();
rocket.scale(rocket.getWidth()/5, rocket.getHeight()/5);
turn(-90);
}
public void act()
{
int x = this.getX();
int y = this.getY();
if(this.isTouching(Mushrooms.class)){
removeTouching(Mushrooms.class);
this.setLocation(x, 568);
}
if(Greenfoot.isKeyDown("left"))
{
setLocation(getX() - 3, getY());
}
if(Greenfoot.isKeyDown("right"))
{
setLocation(getX() + 3, getY());
}
if(Greenfoot.isKeyDown("space")){
if(!(isAtEdge() || isTouching(Mushrooms.class) || isTouching(Centipede.class))){
setLocation(getX(), getY() - 1);
}
}
}
}
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