public function drawAndMoveLine($move = 0)
 {
     parent::drawAndMovePoint($this->x1, $this->y1, $move);
     parent::drawAndMovePoint($this->x2, $this->y2, $move);
 }
<?php

require 'point.php';
$point = new Point();
$point->drawAndMovePoint(10, 15);
$point->displayImage();
 public function drawAndMoveTriangle($move = 0)
 {
     parent::drawAndMovePoint($this->x1, $this->y1, $move);
     parent::drawAndMovePoint($this->x2, $this->y2, $move);
     parent::drawAndMovePoint($this->x3, $this->y3, $move);
 }
 public function drawAndMoveShape($move = 0)
 {
     for ($i = 0; $i < count($this->points); $i++) {
         parent::drawAndMovePoint($this->points[$i][0], $this->points[$i][1], $move);
     }
 }