counting the balls that hit the rectangle

Hamzeh_89

Hi there

i have a question which is how to add a counter for the balls that hit the rectangle ? 

this is the code 


    float x, y, speedX, speedY;
    float diam = 10;
    float rectSize = 100;

    final int WIDTH = 1366;
    final int HEIGHT = 768;
    final int NUM_OF_BALLS = 64;
    final int BALL_SIZE = 25;

    float ball_x[] = new float[NUM_OF_BALLS];
    float ball_y[] = new float[NUM_OF_BALLS];
    float ball_dx[] = new float[NUM_OF_BALLS];
    float ball_dy[] = new float[NUM_OF_BALLS];

    void setup() {
      fullScreen( );
      fill(0, 255, 0);
      reset();

      for (int i = 0; i < NUM_OF_BALLS; i ++) {
        ball_x[i] = random(0, rectSize); 
        ball_y[i] = random(0, rectSize);
        ball_dx[i] = random(-3, 3);
        ball_dy[i] = random(-3, 3);
      }
    }

    void reset() {
      x = width/2;
      y = height/2;
      speedX = random(3, 5);
      speedY = random(3, 5);
    }

    void draw() { 
      background(0);

       for (int i = 0; i < NUM_OF_BALLS; i ++) {
        ellipse(ball_x[i], ball_y[i], BALL_SIZE, BALL_SIZE);
        ball_x[i] += ball_dx[i];
        ball_y[i] += ball_dy[i];
        if (ball_x[i] >= WIDTH - BALL_SIZE) ball_dx[i] = -ball_dx[i];
        if (ball_y[i] >= HEIGHT - BALL_SIZE) ball_dy[i] = -ball_dy[i];
        if (ball_x[i] <= BALL_SIZE) ball_dx[i] = -ball_dx[i];
        if (ball_y[i] <= BALL_SIZE) ball_dy[i] = -ball_dy[i];


      rect(0, 0, 0, height);
      rect(width-15, mouseY-rectSize/2, 10, rectSize);

      x += speedX;
      y += speedY;

      // if ball hits movable bar, invert X direction
      if ( x > width-15 && x < width -20 && y > mouseY-rectSize/2 && y < mouseY+rectSize/2 ) {
        speedX = speedX * -1;
      } 

      // if ball hits wall, change direction of X
      if (x < 25) {
        speedX *= -1.1;
        speedY *= 1.1;
        x += speedX;
      }


      // if ball hits up or down, change direction of Y   
      if ( y > height || y < 0 ) {
        speedY *= -1;
      }
    }
    }

    void mousePressed() {
      reset();
    }

Chrisir

How did you solve it?

TfGuy44

Since I have a nice, large monitor, this small change is immediately more fun (and a lot less of a tease):

float x, y, speedX, speedY; 
float diam = 10; 
float rectSize = 100;

//final int WIDTH = 1366; 
//final int HEIGHT = 768; 
final int NUM_OF_BALLS = 64; 
final int BALL_SIZE = 25;

float ball_x[] = new float[NUM_OF_BALLS]; 
float ball_y[] = new float[NUM_OF_BALLS]; 
float ball_dx[] = new float[NUM_OF_BALLS]; 
float ball_dy[] = new float[NUM_OF_BALLS];

void setup() { 
  fullScreen( ); 
  fill(0, 255, 0); 
  reset();

  for (int i = 0; i < NUM_OF_BALLS; i ++) { 
    ball_x[i] = random(0, rectSize); 
    ball_y[i] = random(0, rectSize); 
    ball_dx[i] = random(-3, 3); 
    ball_dy[i] = random(-3, 3);
  }
}

void reset() { 
  x = width/2; 
  y = height/2; 
  speedX = random(3, 5); 
  speedY = random(3, 5);
}

void draw() { 
  background(0);

  for (int i = 0; i < NUM_OF_BALLS; i ++) { 
    ellipse(ball_x[i], ball_y[i], BALL_SIZE, BALL_SIZE); 
    ball_x[i] += ball_dx[i]; 
    ball_y[i] += ball_dy[i]; 
    if (ball_x[i] >= width - BALL_SIZE) ball_dx[i] = -ball_dx[i]; 
    if (ball_y[i] >= height - BALL_SIZE) ball_dy[i] = -ball_dy[i]; 
    if (ball_x[i] <= BALL_SIZE) ball_dx[i] = -ball_dx[i]; 
    if (ball_y[i] <= BALL_SIZE) ball_dy[i] = -ball_dy[i];

    rect(0, 0, 0, height); 
    rect(width-15, mouseY-rectSize/2, 10, rectSize);

    x += speedX; 
    y += speedY;

    // if ball hits movable bar, invert X direction 
    if ( x > width-15 && x < width -20 && y > mouseY-rectSize/2 && y < mouseY+rectSize/2 ) { 
      speedX = speedX * -1;
    }

    // if ball hits wall, change direction of X 
    if (x < 25) { 
      speedX *= -1.1; 
      speedY *= 1.1; 
      x += speedX;
    }

    // if ball hits up or down, change direction of Y
    if ( y > height || y < 0 ) { 
      speedY *= -1;
    }
  }
}

void mousePressed() { 
  reset();
}

koogs

yes, don't define WIDTH and HEIGHT, they are already available as width and height and will reflect the screen size if you use fullscreen().

how to add a counter for the balls that hit the rectangle ?

// if ball hits movable bar, invert X direction

you could increment a counter in the block here. use a global variable.

Hamzeh_89

Thank you

Hamzeh_89

Hello , how to connect the slider with the acceleration of the balls ?

   import  controlP5.*;
ControlP5 cp5;

int rectHeight  = 100;
int rectWidth   = 20;

int gotBallsCounter = 0;

final int NUM_OF_BALLS = 30;
final int BALL_SIZE = 25;

float ball_x[] = new float[NUM_OF_BALLS];
float ball_y[] = new float[NUM_OF_BALLS];
float ball_dx[] = new float[NUM_OF_BALLS];
float ball_dy[] = new float[NUM_OF_BALLS];


int actualTimer[] = new int[NUM_OF_BALLS];

void setup() {
  fullScreen();
  fill(0, 255, 0);



  for (int i = 0; i < NUM_OF_BALLS; i ++) {
    ball_x[i] = random(0, rectHeight);
    ball_y[i] = random(0, rectHeight);
    ball_dx[i] = random(-5, 4);
    ball_dy[i] = random(-5, 4);
    if (ball_dx[i] < 2 && ball_dx[i] >= 0 ) ball_dx[i] = 2;
    if (ball_dx[i] == -1) ball_dx[i] = -2;
    if (ball_dy[i] < 2 && ball_dy[i] >= 0 ) ball_dy[i] = 2;
    if (ball_dy[i] == -1) ball_dy[i] = -2;


  }

     cp5 = new ControlP5(this);

   cp5.addSlider("Speed")
     .setPosition(600,50)
     .setRange(0,255)
     ;
}

void draw() {
  background(0);

  for (int i = 0; i < NUM_OF_BALLS; i ++) {
    ellipse(ball_x[i], ball_y[i], BALL_SIZE, BALL_SIZE);
    ball_x[i] += ball_dx[i];
    ball_y[i] += ball_dy[i];


    if (ball_x[i] >= width-BALL_SIZE/2) ball_dx[i] = -ball_dx[i];

    if (ball_y[i] >= height-BALL_SIZE/2) ball_dy[i] = -ball_dy[i];

    if (ball_x[i] <= BALL_SIZE/2) ball_dx[i] = -ball_dx[i];

    if (ball_y[i] <= BALL_SIZE/2) ball_dy[i] = -ball_dy[i];


    rect(width-rectWidth, mouseY-rectHeight/2, rectWidth, rectHeight);


    if ( ball_x[i] >= width-rectWidth-BALL_SIZE/2 && ball_y[i] > mouseY-rectHeight/2 && ball_y[i] < mouseY+rectHeight/2 ) {
      ball_dx[i] = -ball_dx[i];


      int timer = millis();
      if (timer-actualTimer[i] >= 5000)
      {
        gotBallsCounter++;
        actualTimer[i] = timer;
      }
    }

    textSize(32);
    text(gotBallsCounter, 10, 30);
  }
}