Graphic.lineTo HELP

1

how would i target a section of a graphin of lineTo and make jsut that section not visible

here is my current code…

private function drawLaser():void
        {
            laserCanvas.graphics.clear();
            laserCanvas.graphics.lineStyle(5,0xffffff);
            laserCanvas.graphics.moveTo(draggableVector[0].x,draggableVector[0].y);
            for (var i:Number=1; i<DRAGGABLES; i++)
            {
                laserCanvas.graphics.lineTo(draggableVector*.x,draggableVector*.y);
            }
            laserCanvas.graphics.lineTo(draggableVector[0].x,draggableVector[0].y);
        }

i want to target the section between draggableVector2 and draggableVector3 and make that section not visble…
and i wanat this to be inside of a hittest for whenever the line hits an “obstical”