Glitch - OpenProcessing

mySketch
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int lineNum = 200;
int ellNum = 50;
int rectNum = 50;
int gridX, gridY;
color gridColor;
​
float[] lineX = new float[lineNum];
float[] lineY = new float[lineNum];
float[] lineX1 = new float[lineNum];
float[] lineY1 = new float[lineNum];
​
float[] ellX = new float[ellNum];
float[] ellY = new float[ellNum];
float[] ellD = new float[ellNum];
​
float[] rectX = new float[rectNum];
float[] rectY = new float[rectNum];
float[] rectW = new float[rectNum];
float[] rectH = new float[rectNum];
​
color[] r = new color[50];
color[] g = new color[50];
color[] b = new color[50];
​
boolean clickButton = false;
​
void setup() {
  size(500, 500);  
  gridX = width/2;
  gridY = height/2;
  gridColor = color(random(255), random(255), random(255));
}
void draw() {
if(clickButton){
  background(0);
}else{
  background(0);
  noStroke();
  fill(gridColor);
  for (float x = -width; x<=width; x= x+20) {
    for (float y = -height; y<=height; y=y+20) {
      float diameter = dist(gridX, gridY, x+gridX, y+gridY) / 20; 
      ellipse(gridX + x, gridY + y, diameter, diameter);
    }
  }
}
​
    int m = millis();
​
 for (int i=0; i<lineNum; i++) {
    r[i] = color(random(255), random(200), random(200));
    stroke(r[i] % 255);
    lineX[i] = random(width);
    lineY[i] = random(height);
    lineX1[i] = random(500);
    lineY1[i] = random(500);
    line(lineX[i], lineY[i], lineX1[i], lineY1[i]);
  } 
  for (int i=0; i<ellNum; i++) {
    g[i] = color(random(200), random(255), random(200));
    fill(g[i] % 255);
    ellX[i] = random(width);
    ellY[i] = random(height);
    ellD[i] = random(40);
    ellipse(ellX[i], ellY[i], ellD[i], ellD[i]);
  }
  for (int i=0; i<rectNum; i++) {
    b[i] = color(random(200), random(200), random(255));
    fill( b[i] % 255);
    rectX[i] = random(width);
    rectY[i] = random(height);
    rectW[i] = random(50);
    rectH[i] = random(40);
    rect(rectX[i], rectY[i], rectW[i], rectH[i]);
  }
   
   
  frameRate (10);
}
void mousePressed() {
​
      gridColor =  color (random (255), random (255), random(255) );
​
    
  }