hi guys, I'm working on a final project with processing. And I decided to redo a space Invaders game.
But with my code I'm not able to create the shot animation when I press the spacebar it creates a line of shots and not the animation...
can someone help me ?

Ship mothership;
Enemy creature1;
Fire shot;

void setup() {
 size(350,800);
 smooth();
 mothership=new Ship(width/2,height-10,40,10);
 creature1=new Enemy(400,200,75,75);
 shot=new Fire(width/2,10,10);
 noStroke();
}

void draw() {
 background(0);
 shot.posXShot=mothership.posXMothership;
 shot.posYShot=mothership.posYMothership;
 shot.drawShot();
 mothership.displayMothership();
 creature1.displayCreature1();
}

class Enemy {
 float posXCreature1;
 float posYCreature1;
 float wCreature1;
 float hCreature1;

 Enemy(float posXCreature1, float posYCreature1, float wCreature1, float hCreature1) {
   this.posXCreature1=posXCreature1;
   this.posYCreature1=posYCreature1;
   this.wCreature1=wCreature1;
   this.hCreature1=hCreature1;
 }

 void displayCreature1() {
   fill(255);
   rectMode(CENTER);
   rect(posXCreature1,posYCreature1,wCreature1,hCreature1);
 }
}

class Fire {
 boolean finishLine;
 float posXShot;
 float posYShot;
 float sizeShot;

 Fire (float posXShot, float posYShot, float sizeShot){
   this.posXShot=posXShot;
   this.posYShot=posYShot;
   this.sizeShot=sizeShot;
 }
 void drawShot(){
   if (keyPressed && key == 32){
     while (posYShot>-10 && !finishLine){
       posYShot-=10;
       fill(255);
       ellipse(posXShot,posYShot,sizeShot,sizeShot);
     }
   }
 }
}

class Ship {
 float posXMothership;
 float posYMothership;
 float rectWMothership;
 float rectHMothership;

 Ship(float posXMothership,float posYMothership, float rectWMothership, float rectHMothership) {
   this.posXMothership=posXMothership;
   this.posYMothership=posYMothership;
   this.rectWMothership=rectWMothership;
   this.rectHMothership=rectHMothership;
 }

 void displayMothership() {
   fill(255);
   rectMode(CENTER);
   rect(posXMothership,posYMothership,rectWMothership,rectHMothership);
   if(keyPressed){
     if(keyCode==LEFT && posXMothership>rectWMothership-rectWMothership/2){
         posXMothership--;
     }
     if(keyCode==RIGHT && posXMothership<width-rectWMothership/2){
         posXMothership++;
     }
   }
 }
}

Thx but I'm having another problem now.. so if I press the left or right arrow to move the ship, it moves everything is ok but as soon as I touch another key, for exemple the spacebar to shot, it stops the moving platform... I have to release it and reclick... is there a fix to that?

And also is there a way making my shot appear only when the key is released so that it doesn't pop out is I have the key down.

Ship mothership;
Enemy creature1;
Fire shot;


void setup() {
 size(350,800);
 smooth();
 mothership=new Ship(width/2,height-10,40,10);
 creature1=new Enemy(width/2,200,20,20);
 shot=new Fire(width/2,10,10);
 noStroke();
}

void draw() {
 background(0);
 shot.drawShot();
 mothership.displayMothership();
 creature1.displayCreature1();
}

class Enemy {
float posXCreature1;
float posYCreature1;
float wCreature1;
float hCreature1;

Enemy(float posXCreature1, float posYCreature1, float wCreature1, float hCreature1) {
  this.posXCreature1=posXCreature1;
  this.posYCreature1=posYCreature1;
  this.wCreature1=wCreature1;
  this.hCreature1=hCreature1;
}

void displayCreature1() {
  fill(255);
  rectMode(CENTER);
  rect(posXCreature1,posYCreature1,wCreature1,hCreature1);
}
}

int shottimer;
int counter;

class Fire {
 boolean finishLine;
 float posXShot;
 float posYShot;
 float sizeShot;

 Fire (float posXShot, float posYShot, float sizeShot){
   this.posXShot=posXShot;
   this.posYShot=posYShot;
   this.sizeShot=sizeShot;
 }
 void drawShot(){
   shottimer++;
   if (keyPressed && key == 32 && shottimer > 85){
     counter ++;
     println(counter);
     shottimer = 0;
     posXShot =  mothership.posXMothership;
     posYShot =  mothership.posYMothership;
   }
   if( posYShot > -30 && !finishLine){
     posYShot-=10;
     fill(255);
     ellipse(posXShot,posYShot,sizeShot,sizeShot);
   }
   println(shottimer);
 }
}

class Ship {
float posXMothership;
float posYMothership;
float rectWMothership;
float rectHMothership;

Ship(float posXMothership,float posYMothership, float rectWMothership, float rectHMothership) {
  this.posXMothership=posXMothership;
  this.posYMothership=posYMothership;
  this.rectWMothership=rectWMothership;
  this.rectHMothership=rectHMothership;
}

void displayMothership() {
  fill(255);
  rectMode(CENTER);
  rect(posXMothership,posYMothership,rectWMothership,rectHMothership);
  if(keyPressed){
    if(keyCode==LEFT && posXMothership>rectWMothership-rectWMothership/2){
        posXMothership--;
    }
    if(keyCode==RIGHT && posXMothership<width-rectWMothership/2){
        posXMothership++;
    }
  }
}
}