Hello,
I have just about finished creating a little plat former game, but I am currently having an issue with one of the objects. I have created a spring/trampoline object, where when my player (Alien) jumps on it, it will bounce up instantly. However, I need to change something with my platforms because when my player is sitting on them, it automatically falls down. But I am not sure what code I need to change in order to allow the player to stay on the platform, while it is not on the spring/trampoline.
Here is my code for my player (the checkForJump() method is what allows the player to jump on the spring):
P.S I am very sorry for how long my code is
Thanks in advance!
import greenfoot.*; // (World, Actor, GreenfootImage, Greenfoot and MouseInfo)
public class Alien extends Player
{
private int vSpeed = 0; //how fast player falls down to platforms
private int acceleration = 2; //accelerates the speed of falling, rather than just floating to the ground
private boolean jumping; //keeps track of whether player is jumping or not
private int jumpStrength = 23; //controls how far up player jumps
private int speed = 4; //how fast character moves around
private int direction = 1;
private int shootingCounter = 20; //count down from 20. When it hits 1, player will shoot
private GreenfootImage alien = new GreenfootImage("Alien.png");
private GreenfootImage alien2 = new GreenfootImage("Alien2.png");
private GreenfootImage alienl = new GreenfootImage("Alienl.png");
private GreenfootImage alien2l = new GreenfootImage("Alien2l.png");
private int frame = 1; //keeps track of image shown
private int animationCounter = 0;
private int coinCount_;
private int diamondCount_;
private int gravity;
public Alien()
{
super();
coinCount_ = 0;
diamondCount_ = 0;
}
public void act()
{
checkFall();
checkKey();
platformAbove();
checkRightWalls();
checkLeftWalls();
collect();
shooting();
checkForJump();
animationCounter ++; //count up by one
shootingCounter --; //count down by one
Key key = (Key)getOneIntersectingObject(Key.class);
if (key != null) key.encountered();
KeyL2 keyl2 = (KeyL2)getOneIntersectingObject(KeyL2.class);
if (keyl2 != null) keyl2.encountered();
KeyL3 keyl3 = (KeyL3)getOneIntersectingObject(KeyL3.class);
if (keyl3 != null) keyl3.encountered();
Door door = (Door)getOneIntersectingObject(Door.class);
if (door != null && door.isOpened())
{
Greenfoot.setWorld(new levelTwo());
}
DoorL2 doorl2 = (DoorL2)getOneIntersectingObject(DoorL2.class);
if (doorl2 != null && doorl2.isOpened())
{
Greenfoot.setWorld(new levelThree());
}
DoorL3 doorl3 = (DoorL3)getOneIntersectingObject(DoorL3.class);
if (doorl3 != null && doorl3.isOpened())
{
Greenfoot.setWorld(new winScreen());
}
gravity--;
setLocation(getX(), getY() - gravity);
checkForJump();
}
public void checkKey()
{
if(Greenfoot.isKeyDown("up") && jumping == false) //cannot be already jumping to make character jump
{
jump();
}
if(Greenfoot.isKeyDown("right"))
{
direction = 1;
moveRight();
}
if(Greenfoot.isKeyDown("left"))
{
direction = -1;
moveLeft();
}
}
private void checkForJump()
{
Actor a = getOneIntersectingObject(Spring.class);
if (a != null) {
gravity = 20; // this will make the character jump
}
}
public boolean shooting()
{
if(Greenfoot.isKeyDown("space") && shootingCounter <= 0 && direction == 1)
{
getWorld().addObject(new ShootRight(), getX(), getY());
shootingCounter = 20;
return true;
}
if(Greenfoot.isKeyDown("space") && shootingCounter <= 0 && direction == -1)
{
getWorld().addObject(new ShootLeft(), getX(), getY());
shootingCounter = 10;
return true;
}
if(Greenfoot.isKeyDown("z") && shootingCounter <= 0 && direction == 1)
{
getWorld().addObject(new FShootRight(), getX(), getY());
shootingCounter = 20;
return true;
}
if(Greenfoot.isKeyDown("z") && shootingCounter <= 0 && direction == -1)
{
getWorld().addObject(new FShootLeft(), getX(), getY());
shootingCounter = 10;
return true;
}
return false;
}
public void moveRight()
{
setLocation(getX() + speed, getY());
if(animationCounter % 10 == 0)
animateRight();
}
public void moveLeft()
{
setLocation(getX() - speed, getY());
if(animationCounter % 10 == 0)
animateLeft();
}
public void animateRight()
{
if(frame == 1)
{
setImage(alien);
}
else if(frame == 2)
{
setImage(alien2);
frame = 1;
return;
}
frame ++; //add one frame to itself
}
public void animateLeft()
{
if(frame == 1)
{
setImage(alienl);
}
else if(frame == 2)
{
setImage(alien2l);
frame = 1;
return;
}
frame ++; //add one frame to itself
}
public void fall()
{
setLocation(getX(), getY() + vSpeed);
if(vSpeed <=9)
{
vSpeed = vSpeed + acceleration; //falls down 2 pixels per cycle
}
jumping = true;
}
public boolean onGround()
{
int spriteHeight = getImage().getHeight();
int yDistance = (int) (spriteHeight/2) + 5; //look for ground 5 pixels below character
Actor ground = getOneObjectAtOffset(0, getImage().getHeight()/2, platform.class);
if(ground == null)
{
jumping = true;
return false;
}
else
{
moveToGround(ground);
return true;
}
}
public boolean platformAbove()
{
int spriteHeight = getImage().getHeight();
int yDistance = (int) (spriteHeight/-2); //look above
Actor ceiling = getOneObjectAtOffset(0, yDistance, platform.class);
if(ceiling != null)
{
vSpeed =1;
bopHead(ceiling);
return true;
}
else
{
return false;
}
}
public boolean checkRightWalls()
{
int spriteWidth = getImage().getWidth();
int xDistance = (int) (spriteWidth/2);
Actor rightWall = getOneObjectAtOffset(xDistance, 0, platform.class);
if(rightWall == null)
{
return false;
}
else
{
stopByRightWall(rightWall);
return true;
}
}
public void stopByRightWall(Actor rightWall)
{
int wallWidth = rightWall.getImage().getWidth();
int newX = rightWall.getX() - (wallWidth + getImage().getWidth())/2;
setLocation(newX - 5, getY()); //the - 5 allows the player to bounce off of the wall
}
public boolean checkLeftWalls()
{
int spriteWidth = getImage().getWidth();
int xDistance = (int) (spriteWidth/2);
Actor leftWall = getOneObjectAtOffset(-xDistance, 0, platform.class);
if(leftWall == null)
{
return false;
}
else
{
stopByLeftWall(leftWall);
return true;
}
}
public void stopByLeftWall(Actor leftWall)
{
int wallWidth = leftWall.getImage().getWidth();
int newX = leftWall.getX() + (wallWidth + getImage().getWidth())/2;
setLocation(newX + 5, getY()); //the + 5 allows the player to bounce off of the wall
}
public void bopHead(Actor ceiling)
{
int ceilingHeight = ceiling.getImage().getHeight();
int newY = ceiling.getY() + (ceilingHeight + getImage().getHeight())/2;
setLocation(getX(), newY);
}
public void moveToGround(Actor ground)
{
int groundHeight = ground.getImage().getHeight();
int newY = ground.getY() - (groundHeight + getImage().getHeight())/2;
setLocation(getX(), newY);
jumping = false;
}
public void checkFall()
{
if(onGround())
{
vSpeed =0; //If the player is on the ground(platform), vertical speed will stop
}
else
{
fall();
}
}
public void jump()
{
vSpeed = vSpeed - jumpStrength; //makes character move up
jumping = true;
fall();
}
public boolean canSee(Class clss)
{
return getOneObjectAtOffset(0, 0, clss) != null;
}
public void eat(Class clss)
{
Actor actor = getOneObjectAtOffset(0, 0, clss);
if(actor != null) {
getWorld().removeObject(actor);
}
}
public void collect()
{
if (canSee(Coin.class))
{
eat(Coin.class);
coinCount_ ++;
}
if (canSee(Diamond.class))
{
eat(Diamond.class);
diamondCount_ ++;
}
}
public int coinCount()
{
return coinCount_;
}
public int diamondCount()
{
return diamondCount_;
}
}