Setup and Draw
/**
* Setup and Draw.
*
* The code inside the draw() function runs continuously
* from top to bottom until the program is stopped. The
* code in setup() is run once when the program starts.
*/
int y = 180;
// The statements in the setup() block run 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 run until the program
// is stopped. Each statement is run in sequence from top
// to bottom and after the last line is read, the
// first line is run again.
void draw() {
background(0); // Clear the screen with a black background
line(0, y, width, y);
y = y - 1;
if (y < 0) {
y = height;
}
}