Glitch - OpenProcessing

mySketch
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//Variables
​
int numCircs = 300;  
​
​
//Speed
​
float [] speedx = new float [numCircs]; 
float [] speedy = new float [numCircs];
​
//Button
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int[] rectX = new int [100];
int[]rectY = new int [100];
int[]rectW = new int [100];
int[]rectH = new int [100]; 
​
//Ball
int[]ballW = new int [100];
int[]ballH = new int [100];  
​
// Location
​
float [] ballXpos = new float [numCircs]; //# of balls I want
float [] ballYpos = new float [numCircs]; //# of balls I want
​
// ball touched the button?
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boolean button = false;
​
​
void setup () {
​
  size (400, 400);
  for(int i = 0; i < 100; i++){
​
    speedx[i]=(int)random(100);
  }
  // either i++ or i = i + 1never both!
  for (int i = 0; i < ballYpos.length; i = i+1) {
​
    speedy[i]=(int)random(100);
}
  }
​
​
void draw () {
 background(0,0,0);
  strokeWeight(10);
  frameRate(1000);
for (int i = 0; i < width; i++) {
    float r = random(255);
    stroke(r);
    line(i, 0, i, height);//help from processing.org
  if (button == true) {
  
    rect (width/2, height/2, 300,300);
  } else {
​
    // if no touch stays same
​
    background(255,0,0);
  }  
​
  for (int c = 0; c < numCircs; c = c+1) {
    
    fill (255, 0, 0);
    ellipse (ballXpos[c], ballYpos[c], 30, 30);   
    ballYpos[c] = ballYpos[c] + speedy[c];
    ballXpos[c] = ballXpos[c] + speedx[c];
        if ( (ballXpos[c] > width) || (ballXpos[c] < 10) ) {
​
      speedx[c] = speedx[c] * -1;
    }
    // is the ball touching the top or bottom? 
    if ( (ballYpos[c] > height) || (ballYpos[c] < 10) ) {
​
      speedy[c] = speedy[c] * -1;
    }
  }
  }
}