How to make 2 moving objects collide?

rmar15

Hello, I'm currently making this little game where you're a ball and you must dodge other balls, and I want to make that when some ball hits you the game ends, I've read that dist() may help, but I've only seen it work with static objects and the mouse, not both being moving.

This my code:

int a=390;
int b=390;
int c=390;
int d=390;
int e=390;
int f=390;
int g=390;
int h=390;
int i=390;
int j=390;

void setup () {
size (420,420);
}

void draw () {
  background(mouseY +250,mouseY ,0);
  ellipse (mouseX,mouseY, 30,30);
    a=a-5;
    b=b-4;
    c=c-7;
    d=d-5;
    e=e-6;
    f=f-3;
    g=g-5;
    h=h-6;
    i=i-7;
    j=j-3;
    ellipse (30,a+1, 25,25);
    ellipse (75,b+2, 25,25);
    ellipse (120,c+1,25,25);
    ellipse (165,d+2,25,25);
    ellipse (210,e+1,25,25);
    ellipse (255,f+2,25,25);
    ellipse (300,g+1,25,25);
    ellipse (345,h+2,25,25);
    ellipse (390,i+1,25,25);

    if (a<=0)
    a=390;
    if (b<=0)
    b=390;
    if (c<=0)
    c=390;
    if (d<=0)
    d=390;
    if (e<=0)
    e=390;
    if (f<=0)
    f=390;
    if (g<=0)
    g=390;
    if (h<=0)
    h=390;
    if (i<=0)
    i=390;

}

Any help will be appreciated!

koogs

Edit post, highlight code, press Ctrl-o to format code.

Have you read the collision detection post in the Common Questions part of the forum?

rmar15

Thanks for your answer and the code thingy.

Yeah, I've seen several options but haven't find any that suits with what I need

kfrajer

A modified version below. If you want to have multiple objects, you can use an array or an ArrayList container https://processing.org/reference/ArrayList.html and classes. If this interests you, you can check:
https://processing.org/tutorials/arrays/
https://processing.org/tutorials/objects/

Kf

int a=390;

void setup () {
  size (420, 420);
}

void draw () {
  background(mouseY +250, mouseY, 0);
  ellipse (mouseX, mouseY, 30, 30);
  a=a-5;

  ellipse (30, a+1, 25, 25);

  if (dist(mouseX, mouseY, 30, a+1)<25)
    noLoop();


  if (a<=0)
    reset();
}

void reset() {
  a=390;
}

void keyReleased(){
  reset();
  loop();
}

rmar15

Thanks a lot! that was just what I needed, si all I got to do now is make a class for the balls so every single one will "end loop"?

kfrajer

This is an example using classes.

Kf

int a=390;

int n=10;
ArrayList<Ball> manyBalls = new ArrayList<Ball>();

class Ball {

  int x, y, r;
  float speed;
  Ball(int xx, int  yy) {
    x=xx;
    y=yy;
    r=25;
    speed=random(2, 8);
  }

  void draw() {
    ellipse (x, y, 25, 25);
  }

  void update() {    
    checkBoundaries();
    y-=speed;
  }

  void checkBoundaries() {
    if (y<0)
      reset();
  }

  void reset() {
    y=height;
    speed=random(2, 8);
  }

  boolean checkContact(int xx, int yy) {
    return dist(x, y, xx, yy)<r;
  }
}

void setup () {
  size (420, 420);
  for (int i=0; i<n; i++) {
    manyBalls.add(new Ball((int)random(width), 0));
  }
}

void draw () {
  background(mouseY +250, mouseY, 0);

  boolean mouseHover=false;
  for (Ball b : manyBalls) {
    b.update();
    b.draw();
    mouseHover|=b.checkContact(mouseX, mouseY);
  }

  if (mouseHover==true)
    noLoop();

  ellipse (mouseX, mouseY, 30, 30);
}



void keyReleased() {
  for (Ball b : manyBalls) {
    b.reset();
  }
  loop();
}

rmar15

Wow!!! thank you very much, really, you saved me, thanks.