public static function fromPoints($point_a, $point_b, $point_c)
{
$plan = new Plan();
// n: AB x AC
// u: AB
// v: AC
// p: OA
$u = Vector::fromPoints($point_a, $point_b);
$v = Vector::fromPoints($point_a, $point_c);
$point = Vector::fromComponents($point_a->x(), $point_a->y(), $point_a->z());
}
protected function vector($args)
{
// vector arg1 arg2 arg3 arg4 ...
//
// arg1: id
// arg2: x
// arg3: y
// arg4: z
//
// add new vector with id.
//
if (count($args) > 3) {
if (isset($args[0]) && isset($args[1]) && isset($args[2]) && isset($args[3])) {
$x = (double) $args[1];
$y = (double) $args[2];
$z = (double) $args[3];
$id = (string) $args[0];
$vector = Vector::fromComponents($x, $y, $z);
$vector->id($id);
$this->_grid['vector'][$vector->id()] = $vector;
$vector->display();
echo "\n";
return true;
} else {
echo "Check the arguments.\n";
return false;
}
} elseif (count($args) == 3) {
if (isset($args[0]) && isset($args[1]) && isset($args[2])) {
$x = (double) $args[0];
$y = (double) $args[1];
$z = (double) $args[2];
$id = 'v' . $this->_vector_counter++;
$vector = Vector::fromComponents($x, $y, $z);
$vector->id($id);
$this->_grid['vector'][$vector->id()] = $vector;
$vector->display();
echo "\n";
return true;
} else {
echo "Check the arguments.\n";
return false;
}
} elseif (count($args) == 1) {
if (isset($args[0])) {
if ($u = $this->vec($args[0])) {
$u->display();
echo "\n";
} else {
echo $args[0] . ": Undefined vector.\n";
}
} else {
echo "Check the arguments.\n";
return false;
}
} elseif (count($args) == 0) {
if (empty($this->_grid['vector'])) {
echo "No vectors defined so far.\n";
} else {
foreach ($this->_grid['vector'] as $v) {
$v->display();
echo "\n";
}
}
} else {
echo "Wrong arguments.\n";
return false;
}
}
