Setup and Draw.

Setup and Draw.

The code inside the draw() function runs continuously from top to bottom until the program is stopped.

int y = 100;

// The statements in the setup() function 
// execute once when the program begins
void setup() {
  size(640, 360);  // Size must be the first statement
  stroke(255);     // Set line drawing color to white
// The statements in draw() are executed until the 
// program is stopped. Each statement is executed in 
// sequence and after the last line is read, the first 
// line is executed again.
void draw() { 
  background(0);   // Clear the screen with a black background
  y = y - 1; 
  if (y < 0) { 
    y = height; 
  line(0, y, width, y);  

Functions Used


Sets the color used to draw lines and borders around shapes

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Defines the dimension of the display window width and height in units of pixels

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The setup() function is run once, when the program starts

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The system variable frameRate contains the approximate frame rate of a running sketch

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Called directly after setup(), the draw() function continuously executes the lines of code contained inside its block until the program is stopped or noLoop() is called

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Draws a line (a direct path between two points) to the screen

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The background() function sets the color used for the background of the Processing window

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