Circle collisions #2

JaeY

I still need one more help. I made a code of bullets that are fired from the red circle. I want to make it so that if the bullet collides with a grey circle, both the grey circle and the bullet are removed from the screen

float radius=10;
int n=100;
float velocityY=3;
int xship=250; //SHIP X POSITION
int yship=500; //SHIP Y POSITION
float bulletX[]; //BULLETS X POSITION
float bulletY[]; //BULLETS Y POSITION
float x[];  // OBSTACLES X POSITIONS
float y[]; //OBSTACLES Y POSITIONS
boolean space; //SPACESHIP BULLET FIRE
int ammo=1;  //AMMO FOR BULLETS

void setup()
{
  size(500, 600);
  x = new float [n];
  y = new float [n];

  bulletX = new float [2];
  bulletY = new float [2];

  for (int i=0; i<x.length; i++)
  {
    x[i]=random(0, width);   //RANDOMIZE OBSTACLES LOCATIONS
    y[i]=random(-600, 0);    //RANDOMIZE OBSTACLES Y LOCATIONS
  }
  noStroke();
  ellipseMode(RADIUS);
}


void draw()
{
  background(0);

  for (int i=0; i<x.length; i++)
  {
    y[i]=y[i]+velocityY;

    //////////////////////////////COLLISION START////////////////////////////////////////
    if (contact(x[i], y[i])==true)
    {
      x[i]=random(0, width);
      y[i]=random(0, 0);
      xship=250; //restart spaceship position
      yship=500;
    }
    /////////////////////////////COLLISION END/////////////////////////////////////
    fill(120);
    ellipse(x[i], y[i], radius, radius); 

    if (y[i]>height) //IF OBSTACLES HIT GROUND
    {
      //y[i]=0; //OBSTACLES START FROM TOP
      x[i]=random(0, 600);  //OBSTACLES RANDOMIZE AGAIN
      y[i]=random(0, 0);    //OBSTACLES RANDOMIZE AGAIN
    }
  }

  fill(124, 255, 60);
  ellipse(xship, yship, radius, radius); //SPACESHIP



  //////////////////////////////////BULLET SPEED AND LOCATION//////START////////
  for (int i=0; i<bulletX.length; i++)
  {
    fill(255, 0, 0);
    ellipse(bulletX[i], bulletY[i], radius, radius); 
    bulletY[i]=bulletY[i]-2; ///BULLETS SPEED
    if (bulletcontact(bulletX[i], bulletY[i], radius, radius)==true) //bullets contact with obstacles
    {
      x[i]=random(0, width); 
      y[i]=random(0, 0);
      bulletY[i]=0;
    }
  }



  ////////////////////BULLET COMES OUT OF SPACESHIP /////////////////START////////////
  if (space == true && ammo>0) 
  {
    float _bulletX[]=append(bulletX, xship);
    float _bulletY[]=append(bulletY, yship-20);
    bulletX = _bulletX;
    bulletY = _bulletY;
    space = false;   
    ammo=ammo-1;  //AMMO COUNT TO 3 MAXIMUM ON SCREEN
  } 

  for (int i = 0; i < bulletY.length; i += 1) 
  {
    if (bulletY[i] <= 0) 
    { 
      ammo += 1;
      arrayCopy(bulletX, i+1, bulletX, i, bulletX.length-i-1);
      bulletX = shorten(bulletX);
      arrayCopy(bulletY, i+1, bulletY, i, bulletY.length-i-1);
      bulletY = shorten(bulletY);
    }
  }
}
////////////////////BULLET COMES OUT OF SPACESHIP///////////////////END////////////////////////

boolean contact(float x2, float y2)
{
  return (dist(xship, yship, x2, y2))<2*radius;
}
boolean bulletcontact(float x3, float y3, float x4, float y4)
{
  return (dist(x3, y3, x4, y4))<=2*radius;
}

void keyPressed()
{
  if (key == ' ') 
  {
    space = true;
  }
}

void keyReleased()
{
  fill(255);
  if (key == ' ') 
  {
    space = false;
  }
}

JaeY

Oh, also, press space bar to shoot the bullet