50 balls

//Variables

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int numCircs = 50;  

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//Speed

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float [] speedx = new float [numCircs]; 

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float [] speedy = new float [numCircs];

//Button

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float rectX, rectY, rectW, rectH; 

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//Ball

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float ballW, ballH;  //ballX, ballY, 

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// Location

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float [] ballXpos = new float [50]; //# of balls I want

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float [] ballYpos = new float [50]; //# of balls I want

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// ball touched the button?

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boolean button = false;

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//true? ball color changes

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int ballsColor;

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void setup () {

size (400, 400);

 //button atttributes

  rectY = height/2;

  rectW = 100;

  rectH = 20;

  //location of all the balls

  for (int i = 0; i < ballXpos .length; i = i++) {

     ballXpos[i] = random(width);

    speedx[i]=2;

  }

   for (int i = 0; i < ballYpos .length; i = i++) {

     ballYpos[i] = random(height);

    speedy[i]=2;

    }

}

​

void draw () {

   background (0);

  // Effect of Button: 

  // 1. change ball color when button is touched

  if (button == true) {

  fill(ballsColor);

      } else {

         // if no touch stays same

        fill(255);

      }  

//counter

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    for (int c = 0; c <50; c = c+1) {

      fill (ballsColor);

   ellipse (ballXpos[c],ballYpos[c],30,30);   

  if((ballXpos[c]< width) || (ballYpos[c] < height) || (ballXpos[c] <50)||(ballYpos[c]<50)){

// ball bouncing off button and sides screen

  if ( (ballXpos[c] > width) || (ballXpos[c] < 0) ) {

    speedx[c] = speedx[c] * -1;

  if ( (ballYpos[c] > height) || (ballYpos[c] < 0) ) {

    speedy[c] = speedy[c] * -1;

        }

     }

   }

}

  //BUTTON

   rectX =  mouseX; 

  fill (#FCD805);   // yellow

  rect (rectX, rectY, rectW, rectH);

  for (int i = 0; i < ballYpos.length; i++) {

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    // Draw the balls at random locations

    fill(255); //white

    ellipse ( ballXpos[i], ballYpos[i], ballW, ballW);// generate new balls 

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    // make them move 

    ballYpos[i] = ballYpos[i] + speedy[i];   

    ballXpos[i] = ballXpos[i] + speedx[i];    

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    // hit detection for the Button - Checks if any ball touches the button

    if ((ballXpos[i] > rectX-ballW) && (ballXpos[i] < rectX+rectW+ballW) && (ballYpos[i] > rectY-ballW) && (ballYpos[i] < rectY+rectH+ballW)) {

      button = !button; 

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      // When any ball hits the button make it bounce in opposit direction

      if ( ( ballYpos[i] < rectY) || ( ballYpos[i] > rectY+rectH)) {   //if it reaches top or bottom, reverse directions 

        speedy[i] = speedy[i] * -1;   //reverse direction vertically

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      //make them bounce randomly around

      } else if ((ballXpos[i] < rectX) || (ballXpos[i] > rectX+rectW)) {   // if it reaches the sides, reverse directions

        speedx[i] = speedx[i] * -1;     // reverse direction horizontally

      }

    }

​

  }

}