Runalyze\DEM\Interpolation\BilinearInterpolation

Complexity

Total Complexity

1

Size/Duplication

Total Lines	33
Duplicated Lines	0 %

Coupling/Cohesion

Components	0
Dependencies	1

Test Coverage

Coverage

0%

Importance

Changes

0

1 Method

Rating	Name	Duplication	Size	Complexity
A	interpolate()	0	11	1

<?php

/*
 * This file is part of the Runalyze DEM Reader.
 *
 * (c) RUNALYZE <mail@runalyze.com>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace Runalyze\DEM\Interpolation;

class BilinearInterpolation implements InterpolationInterface
{
    use ArgumentsCheckTrait;

    /**
     * Interpolate.
     *
     * p0------------p1
     * |      |
     * |      y
     * |      |
     * |--x-- Z
     * |
     * p2------------p3
     *
     * @param  float                    $x                      x position of Z within bounding box, required: $x in [0.0, 1.0]
     * @param  float                    $y                      y position of Z within bounding box, required: $y in [0.0, 1.0]
     * @param  array                    $elevationOnBoundingBox elevation data on [p0, p1, p2, p3]
     * @return int                      estimated elevation on point Z
     * @throws InvalidArgumentException
     */
    public function interpolate($x, $y, array $elevationOnBoundingBox)
    {
        $this->checkArguments($x, $y, $elevationOnBoundingBox);

        return (int) round(
            $elevationOnBoundingBox[0] * (1 - $x) * (1 - $y)
            + $elevationOnBoundingBox[1] * $x * (1 - $y)
            + $elevationOnBoundingBox[2] * $y * (1 - $x)
            + $elevationOnBoundingBox[3] * $x * $y
        );
    }
}