No Loop.

The noLoop() function causes draw() to only execute once. Without calling noLoop(), the code inside draw() is run continually.

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float y;

// The statements in the setup() function 
// execute once when the program begins
void setup() 
{
  size(640, 360);  // Size should be the first statement
  stroke(255);     // Set line drawing color to white
  noLoop();
  
  y = height * 0.5;
}

// 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);   // Set the background to black
  y = y - 1; 
  if (y < 0) { y = height; } 
  line(0, y, width, y);  
}

Functions Used

stroke()

Sets the color used to draw lines and borders around shapes

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size()

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

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setup()

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

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noLoop()

Stops Processing from continuously executing the code within draw()

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draw()

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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line()

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

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background()

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

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