0502arrays

var NUMBEROFCIRCLES = 100;

var x = [];

var y = [];

var v = [];

var a = [];

var c = []; // COLOR

var d = 20;

var carray = ["MediumVioletRed", "DeepPink", "PaleVioletRed", "HotPink", "LightPink", "Pink"];

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function setup() {

  createCanvas(windowWidth, windowHeight);

  background(100);

  for(let i = 0;i<NUMBEROFCIRCLES;i++)

  {

    x[i] = random(width);

    y[i] = random(height);

    v[i] = random(1, 5);

    a[i] = random(-PI, PI);

    c[i] = random(carray);

  }

}

​

function draw() {

  background(255);

  fill(0);

  for(let i = 0;i<NUMBEROFCIRCLES;i++)

  {

    fill(c[i]);

    ellipse(x[i], y[i], d, d);

    x[i] = x[i] + v[i]*cos(a[i]);

    y[i] = y[i] + v[i]*sin(a[i]);

    // boundary checking

    if(x[i]>width) a[i] = PI - a[i];

    if(x[i]<0) a[i] = PI - a[i];

    if(y[i]>height) a[i] = TWO_PI - a[i];

    if(y[i]<0) a[i] = TWO_PI - a[i];

  }

}

​

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