w3_02v3 - OpenProcessing

sketch152063
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/*
 * Creative Coding
 * Week 3, 02 - array with sin()
 * by Indae Hwang and Jon McCormack
 * Copyright (c) 2014 Monash University
 *
 * This program demonstrates the use of arrays.
 * It creates three arrays that store the y-position, speed and phase of some oscillating circles.
 * You can change the number of circles by changing the value of num in setup()
 * You can change the background colour by holding the left mouse button and dragging.
 * 
 */
​
int     num;    // the number of items in the array (# of circles)
float[] y;      // y-position of each circle (fixed)
float[] speed;  // speed of each circle
float[] phase;  // phase of each circle
float[] x;      // x-position of each circle
​
float red = random(255);
float green = random(255);
float blue = random(255);
​
float circSize = random(50, 80);
​
void setup() {
  size(500, 500);
​
  num = (int)random(2,10);
​
  // allocate space for each array
  y = new float[num];
  speed = new float[num];
  phase = new float[num]; 
  x= new float[num];
​
  // calculate the gap in y based on the number of circles
  float gap = height / (num + 1);
​
  //setup an initial value for each item in the array
  for (int i=0; i<num; i++) {
    y[i] = gap * (i + 1);      // y is constant for each so can be calculated once
    speed[i] = random(1,4);
    phase[i] = random(TWO_PI);
  }
}
​
​
void draw() {
  background(red, green, blue);
​
  for (int i=0; i<num; i++) {
    // calculate the x-position of each ball based on the speed, phase and current frame
    x[i] = width/2 + sin(radians(frameCount*speed[i] ) + phase[i])* 200;
    fill(blue, red, green);
    ellipse(x[i], y[i], circSize, circSize);
  }
}
​
​
// change the background colour if the mouse is dragged
void mouseDragged() {
  red = map(mouseX, 0, width, 0, 255);
  green = map(mouseY, 0, height, 0, 255);
  blue = map(mouseX+mouseY, 0, width+height, 255, 0);
}
   void mousePressed (){
      for (int i=0; i<num; i++) {
        if(dist (mouseX, mouseY, x[i], y[i]) < circSize){
          if (speed[i] == 0){
            speed[i] = random(1,4); 
          }
          else{
          speed[i] = 0;
          }
        }
      }
    }