CSE Stars

In my previous post I mentioned that my class was learning about Arrays and how to use them. In order for us to get a better understanding of how Arrays worked my teacher had us take notes on how to create a series of stars that outward. Below is the notes on how to create  a series of stars that move outward using Arrays.

//Creating stars using arrays

//int = whole number

//float = decimal

//int size = 50;

int size = (int)random(250, 500);

float[] xStars = new float[size];

float[] yStars = new float[size];

void setup() {

 size(200, 200);

 background(0);

 stroke(255, 255, 200);

 for (int i = 0; i < size; i++) {

   xStars[i] = random(width);

   yStars[i] = random(height);

 }

}

void draw() {

 background(0);

 // draw the stars

 for (int i = 0; i < size; i++) {

   // update star position

   if (xStars[i] > width/2) {

     xStars[i]++;

   } else {

     xStars[i]--;

   }

   if (yStars[i] > height/2) {

     yStars[i]++;

   } else {

     yStars[i]--;

   }

   if (xStars[i] > width || xStars[i] < 0  ||

     yStars[i] > height || yStars[i] < 0) {

     xStars[i] = random(width);

     yStars[i] = random(height);

   }

   strokeWeight((int)random(2, 5));

   point(xStars[i], yStars[i]);

 }

}

void mousePressed() {

 for (int i = 0; i < size; i++) {

   xStars[i] = random(width);

   yStars[i] = random(height);

 }

}