Subversion Repositories eFlore/Projets.communes

<?php
class Line {
        public $p1;
        public $p2;

        public function __construct(Vector $p1,Vector $p2) {
                $this->p1 = $p1;
                $this->p2 = $p2;
        }

        public function LengthSquared() {
                $dx = $this->p1->x - $this->p2->x;
                $dy = $this->p1->y - $this->p2->y;
                return $dx*$dx + $dy*$dy;
        }
        
        public function DistanceToPointSquared(Vector $point) {
                $v = new Vector($point->x - $this->p1->x, $point->y - $this->p1->y);
                $l = new Vector($this->p2->x - $this->p1->x, $this->p2->y - $this->p1->y);
                $dot = $v->DotProduct($l->UnitVector());
                if ($dot <= 0) {// Point nearest P1
                        $dl = new Line($this->p1, $point);
                        return $dl->LengthSquared();
                }
                if (($dot*$dot)>=$this->LengthSquared()) {// Point nearest P2
                        $dl = new Line($this->p2, $point);
                        return $dl->LengthSquared();
                } else {// Point within line
                        $v2 = new Line($this->p1, $point);
                        $h = $v2->LengthSquared();
                        return $h - $dot * $dot;
                }
        }
}
?>