public static function validateSpline(array $points, $degree = 2) : bool
{
if (count($points) < $degree) {
throw new Exception\BadDataException('You need to have at least $degree sets of coordinates (arrays) for this technique');
}
$x_coordinates = [];
foreach ($points as $point) {
if (count($point) !== 3) {
throw new Exception\BadDataException('Each array needs to have have precisely three numbers, representing x, y, and y-prime');
}
$x_component = $point[self::X];
if (in_array($x_component, $x_coordinates)) {
throw new Exception\BadDataException('Not a function. Your input array contains more than one coordinate with the same x-component.');
}
array_push($x_coordinates, $x_component);
}
return true;
} public function testNotAFunctionException()
{
// Two arrays share the same first number (x-component)
$this->setExpectedException('MathPHP\\Exception\\BadDataException');
ClampedCubicSpline::validateSpline([[0, 0, 1], [0, 5, 0], [1, 1, 3]]);
}