How can I make my bullets not follow the mouse but aim toward it?

Processing Coding Questions
1

Making a zombie survival game and the bullets, after they’re shot, continue to follow the mouse. The PVector “t” cant be initialized in keyReleased but it needs to only give a single value per shot. Instead it keep updating it’s value.

class Bullet
{
  PVector pos;
  PVector spd;
  float damage;
  PVector t = null;
  PVector d;
  boolean setTarg = false;

  //constructor
  Bullet (float x, float y)
  {
    pos = new PVector (x, y);
  }

  void update ()
  {
    display();
    move();
  }

  //methods
  void display ()
  {
    fill (#EDED54);
    ellipse (pos.x, pos.y, 7, 7);
  }

  void move ()
  {
    if (t != null)
    {
      d = PVector.sub(t, pos);
      d.setMag(10);
      pos.add(d);
    }

    if (setTarg = true)
    {
      t = new PVector(mouseX, mouseY);     
    }
  }

  boolean gone()
  {
    if (pos.y <= 0 || pos.y >= 600 || pos.x >= 800 || pos.x <= 0)
      return true;

    return false;
  }

  void keyReleased ()
  {
    if (key == ' ')
    {
      setTarg = true;
    } else
    {
      setTarg = false;
    }
  }
}
2

it’s better when you post an entire Sketch - then we can run it. (or a runable minimal version)

In general, I’d say, when you click the mouse (mousePressed, not keyReleased) you init a new Bullet (in an ArrayList) and pass to it once and for all the current mouse position as a target. Then the bullet flies to the target.

Chrisir

3

Heres the main class. It’s also keyReleased because I want the spacebar to be what shoots the bullets.

//ArrayLists
ArrayList<Bullet> bList = new ArrayList<Bullet>();
ArrayList<Zombie> zList = new ArrayList<Zombie >();
//global variables
int stage = 1;
int score = 0;
int timer;
//fonts
PImage background1;
PImage background2;
//PFont font;

//player
Player player;
//-------------------------------------------------------------------
void setup ()
{
  size (800, 600);
  background1 = loadImage ("zombie.png");
  background2 = loadImage ("sand.png");
  //font = loadFont("text.ttf");



  //Player
  player = new Player ();
  createZombies();
}
//-------------------------------------------------------------------
void draw ()
{
  stages ();
}
//-------------------------------------------------------------------
void stages ()
{
  if (stage == 0) //homescreen
  {
    image (background1, 0, 0);
    //createFont(
  } else if (stage == 1) //play screen
  {
    desert ();
    timer();
    score();
    displayZombies();
    player.display();
    displayBullets();
  }
}
//-------------------------------------------------------------------
void desert ()
{
  image (background2, 0, 0); 
}
//-------------------------------------------------------------------
void createZombies()
{
  for (int i=0; i<8; i++)
  {
    for (int j=0; j<3; j++)
    {
      Zombie z = new Zombie (i*80+100, j*50+50);
      zList.add(z);
    }
  }
}
//-------------------------------------------------------------------
void displayZombies()
{
  for (int i=0; i<zList.size(); i++)
  {
    Zombie z = zList.get(i);
    z.update();
  }
}
//-------------------------------------------------------------------
void displayBullets()
{
  for (int i=0; i<bList.size(); i++)
  {
    Bullet b = bList.get(i);
    b.update();

    if (b.gone()) bList.remove(b);
  
  }
}
//-------------------------------------------------------------------
void keyReleased ()
{
  if (key == ' ')
  {
    Bullet b = new Bullet(player.pos.x, player.pos.y);
    bList.add(b);
  }
}
//-------------------------------------------------------------------
void timer ()
{
  timer = millis();
  fill (0);
  textSize(30);
  text ("TIME:", 10,30);
  text (timer/1000+"s", 85, 30);
}
//-------------------------------------------------------------------
void score ()
{
  fill (0);
  textSize(30);
  text ("SCORE:"+score,640,30);
}
//-------------------------------------------------------------------
void mouseReleased ()
{
  
}
//-------------------------------------------------------------------
4

There are these 2 very old sketches that set a mouse aim trajectory:

  1. Multiple Bullets
  2. Spit Fire → http://Studio.ProcessingTogether.com/sp/pad/export/ro.91nVQMnL$v06L