week 5 - OpenProcessing

mySketch
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//number of balls
int circlenum = 50;
​
float [] SpeedY = new float [circlenum];
float [] SpeedX = new float [circlenum];
​
//location of circles
float [] posY = new float [circlenum];
float [] posX = new float [circlenum];
​
//variables for button
float buttonX, buttonY, buttonW, buttonH, ballW;
​
//whether ball has touched the button
boolean button = false;
​
void setup () {
  size (500,400);
  
  buttonX = width/3+40;
  buttonY = height/2-20;
  buttonH = 50;
  buttonW = 100;
  
  //circle sizes
  ballW = 10;
  
  for (int i = 0; i < posY.length; i++) {
    posY[i] = random(height); 
    SpeedY[i] = 2;
  }
  
  for (int i = 0; i < posX.length; i++) {
    posX[i] = random(height);
    SpeedX[i] = 2;
  }
}
​
void draw () {
  
  //button effect
  if (button) {
    background (255, 201, 254); //light pink
  } else {
    background (250,250,250); //change background
  }
  
  //draw button
  fill (179, 117, 249); //purple
  rect (buttonX, buttonY, buttonW, buttonH);
  
  //move balls and check hit detection
  for (int i = 0; i < posY.length; i++) {
    
    //draw balls at random location
    fill (150, 211, 255); //light blue
    ellipse (posX[i], posY[i], ballW, ballW); //generate balls
    
    //make the balls move
    posY[i] = posY[i] + SpeedY[i];
    posX[i] = posX[i] + SpeedX[i];
    
    //hit detection for button
    if ( (posX[i] > buttonX-ballW) && (posX[i] < buttonX+buttonW+ballW) && (posY[i] > buttonY-ballW) && (posY[i] < buttonY+buttonH+ballW) ) {
      button = !button;
      
      //when balls hit button make bounce in opposite direction
      if ( (posY[i] < buttonY) || (posY[i] > buttonY+buttonH) ) { //if it reaches top or bottom, reverse directions
      SpeedY[i] = SpeedY[i] * -1; //reverse direction vertically
      
      //make them bounce randomly around
      } else if ( (posX[i] < buttonX) || (posX[i] > buttonX+buttonW) ) { //if it reaches the sides, reverse directions
      SpeedX[i] = SpeedX[i] * -1; //reverse direction horizontally
      }
    }
    
    //if it hits the walls (top, bottom), reverse
    if ( (posY[i] > height) || (posY[i] < 0) ) {
      SpeedY[i] = SpeedY[i] * -1;
    }
    //if it hits the walls (sides), reverse
    if ( (posX[i] > width) || (posX[i] < 0) ) {
      SpeedX[i] = SpeedX[i] * -1;
    }
  }
}
​
​