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 "coswave" is created and filled with the cosine values. This data is displayed three separate ways on the screen.

Code

This is a sample code from Processing 3.0. It is sused to illustate ascript page.

 1 float[] coswave; 
 2 void setup() {
 3   size(640, 360);
 4   coswave = new float[width];
 5   for (int i = 0; i < width; i++) {
 6     float amount = map(i, 0, width, 0, PI);
 7     coswave[i] = abs(cos(amount));
 8   }
 9   background(255);
10   noLoop();
11 }
12 //Comment goes here
13 void draw() {
14   int y1 = 0;
15   int y2 = height/3;
16   for (int i = 0; i < width; i++) {
17     stroke(coswave[i]*255);
18     line(i, y1, i, y2);
19   }
20   y1 = y2;
21   y2 = y1 + y1;
22   for (int i = 0; i < width; i++) {
23     stroke(coswave[i]*255 / 4);
24     line(i, y1, i, y2);
25   }
26   y1 = y2;
27   y2 = height;
28   for (int i = 0; i < width; i++) {
29     stroke(255 - coswave[i]*255);
30     line(i, y1, i, y2);
31   }
32 }

A comment or description of the codeblock goes here.

float[] coswave;

A comment or description of the codeblock goes here.

void setup() {
  size(640, 360);
  coswave = new float[width];
  for (int i = 0; i < width; i++) {
    float amount = map(i, 0, width, 0, PI);
    coswave[i] = abs(cos(amount));
  }
  background(255);
  noLoop();
}

A comment or description of the codeblock goes here.

void draw() {
  int y1 = 0;
  int y2 = height/3;
  for (int i = 0; i < width; i++) {
    stroke(coswave[i]*255);
    line(i, y1, i, y2);
  }
  y1 = y2;
  y2 = y1 + y1;
  for (int i = 0; i < width; i++) {
    stroke(coswave[i]*255 / 4);
    line(i, y1, i, y2);
  }
  y1 = y2;
  y2 = height;
  for (int i = 0; i < width; i++) {
    stroke(255 - coswave[i]*255);
    line(i, y1, i, y2);
  }
}

Output

Graphics output on runtime

Souce

processing.org