processing4/java/examples/Basics/Arrays/Array/applet/Array.java

import processing.core.*; 

import java.applet.*; 
import java.awt.*; 
import java.awt.image.*; 
import java.awt.event.*; 
import java.io.*; 
import java.net.*; 
import java.text.*; 
import java.util.*; 
import java.util.zip.*; 
import java.util.regex.*; 

public class Array extends PApplet {
  public void setup() {/**
 * Array. 
 * 
 * An array is a list of data. Each piece of data in an array 
 * is identified by an index number representing its position in 
 * the array. Arrays are zero based, which means that the first 
 * element in the array is [0], the second element is [1], and so on. 
 * In this example, an array named "coswav" is created and
 * filled with the cosine values. This data is displayed three 
 * separate ways on the screen.  
 */

size(200, 200);

float[] coswave = new float[width];

for (int i = 0; i < width; i++) {
  float amount = map(i, 0, width, 0, PI);
  coswave[i] = abs(cos(amount));
}

for (int i = 0; i < width; i++) {
  stroke(coswave[i]*255);
  line(i, 0, i, height/3);
}

for (int i = 0; i < width; i++) {
  stroke(coswave[i]*255 / 4);
  line(i, height/3, i, height/3*2);
}

for (int i = 0; i < width; i++) {
  stroke(255 - coswave[i]*255);
  line(i, height/3*2, i, height);
}

  noLoop();
} 
  static public void main(String args[]) {
    PApplet.main(new String[] { "Array" });
  }
}