| New file |
|---|
| 0,0 → 1,35 |
|---|
| <?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; |
| } |
| } |
| } |
| ?> |