function midline(){
    for(i=0;i<480;i+=10) {
    var y = 0;
    fill("white");
    stroke(0);
    rect(width/2,y+i,10,480);
    }
}
//function midline draw a line in center
function midline draw a line in center
function midline draw a line in center
function midline(){
    for(i=0;i<480;i+=10) {
    var y = 0;
    fill("white");
    stroke(0);
    rect(width/2,y+i,10,480);
    }
}
function midline ( ) { for ( i = 0 ; i < 480 ; i += 10 ) { var y = 0 ; fill ( "white" ) ; stroke ( 0 ) ; rect ( width / 2 , y + i , 10 , 480 ) ; } }
function midline draw a line in center
function midline draw a line in center