Location\Processor\Polyline\SimplifyBearing::simplify PHP Method

    public function simplify(Polyline $polyline)
    {
        $counterPoints = $polyline->getNumberOfPoints();
        if ($counterPoints < 3) {
            return clone $polyline;
        }
        $result = new Polyline();
        $bearingCalc = new BearingEllipsoidal();
        $points = $polyline->getPoints();
        $index = 0;
        // add the first point to the resulting polyline
        $result->addPoint($points[$index]);
        do {
            $index++;
            // preserve the last point of the original polyline
            if ($index === $counterPoints - 1) {
                $result->addPoint($points[$index]);
                break;
            }
            $bearing1 = $bearingCalc->calculateBearing($points[$index - 1], $points[$index]);
            $bearing2 = $bearingCalc->calculateBearing($points[$index], $points[$index + 1]);
            $bearingDifference = min(fmod($bearing1 - $bearing2 + 360, 360), fmod($bearing2 - $bearing1 + 360, 360));
            if ($bearingDifference > $this->bearingAngle) {
                $result->addPoint($points[$index]);
            }
        } while ($index < $counterPoints);
        return $result;
    }

 public function testSimplifyTwoPointsImpossible()
 {
     $polyline = new Polyline();
     $polyline->addPoint(new Coordinate(10.0, 10.0));
     $polyline->addPoint(new Coordinate(20.0, 20.0));
     $processor = new SimplifyBearing(10);
     $simplified = $processor->simplify($polyline);
     $this->assertEquals($polyline, $simplified);
 }