Structure

	//setup method runs once
	 void setup() {
	   size(400, 400);
	   stroke(255);
	 }
	//draw method runs multiple times	  
	 void draw() {
	   line(150, 25, mouseX, mouseY);
	 }
	/*mousePressed and other
	event based methods run on event */
	 void mousePressed() {
	   background(192, 64, 0);
	 }