1 

     2 void setup() {

     3 	size( 500, 500 );

     4 	background( 333 );

     5 }

     6 

     7 void draw()

     8 {

     9 	stroke( 255 );

    10 	if ( mousePressed == true ) {

    11 		line( mouseX, mouseY, pmouseX, pmouseY );

    12 	}

    13 }

    14