collision and gravity balls

tcruzini

hey! im new to processing and i have a question.... how can i make a ball bounce when collides with a line? not losing the gravity factor of course.. thanks in advance!

the code is here:

bilmor

You'll get a better response if you format your code. Here's how:

http://forum.processing.org/two/discussion/8045/how-to-format-code-and-text

TfGuy44

Also we don't have your Ball class. That's sort of important for us to have is we're going to try running this to see what your problem is.

tcruzini

thank you guys ok so this is the main:

import java.util.Vector;

Ball[] bolas;
float ball_gravity = 0.5;

void setup() {
  size(400,400);
  smooth();
  noCursor();
  stroke(1);
  fill(255);
  line(width/2, height/2, width/2+50, height/2+50);  
  bolas = new Ball[1];
 bolas[0]=new Ball(50,0,30);

}

void draw() {
  background(255);
   stroke(1);
  fill(255);
  line(width/2, height/2, width/2+100, height/2+100);  

  rectMode(CENTER);
  stroke(0);
  fill(color(#B40D56));
  rect(mouseX,mouseY,4,30);
  for (int i = 0; i < bolas.length; i ++ ) { // Whatever the length of that array, update and display all of the objects.
    bolas[i].gravity(ball_gravity);
    bolas[i].move();
    bolas[i].rollOver(mouseX,mouseY,pmouseX);
    bolas[i].display();
  }
}

void mousePressed() {
  // A new ball object
  Ball b = new Ball(mouseX,mouseY,30); // Make a new object at the mouse location.
  bolas =  (Ball[]) append(bolas,b);

}    

and this is the class ball

class Ball {
  float x;
  float y;
  float speed;
  float w;
  color cor;

  Ball(float tempX, float tempY, float tempW) {
    x = tempX;
    y = tempY;
    w = tempW;
    speed = 0;
    cor=color(int(random(250)),int(random(250)),int(random(250)));
  }

  void gravity(float gravity) {
    // Add gravity to speed
    speed = speed + gravity;
  }

  void move() {
    // Add speed to y location
    y = y + speed;
    // If square reaches the bottom
    // Reverse speed
    if (y > height) {
      speed = speed * -0.90;
      y = height;
    }
  }

  void rollOver(int mx, int my, int pmx){
    float d=dist(mx,my,x,y);
    if(d<=w/2){
      if(pmx>mx)
        x=x-30;
      else
        x=x+30;
      x=constrain(x,0,width);
    }
  }

  void display() {
    // Display the circle
    ellipseMode(CENTER);
    fill(cor);
    stroke(0);
    ellipse(x,y,w,w);
  }
} 

Chrisir

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