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1 efrain 1 
<?php
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namespace PhpOffice\PhpSpreadsheet\Chart;
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class TrendLine extends Properties
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{
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    const TRENDLINE_EXPONENTIAL = 'exp';
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    const TRENDLINE_LINEAR = 'linear';
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    const TRENDLINE_LOGARITHMIC = 'log';
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    const TRENDLINE_POLYNOMIAL = 'poly'; // + 'order'
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    const TRENDLINE_POWER = 'power';
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    const TRENDLINE_MOVING_AVG = 'movingAvg'; // + 'period'
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    const TRENDLINE_TYPES = [
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        self::TRENDLINE_EXPONENTIAL,
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        self::TRENDLINE_LINEAR,
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        self::TRENDLINE_LOGARITHMIC,
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        self::TRENDLINE_POLYNOMIAL,
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        self::TRENDLINE_POWER,
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        self::TRENDLINE_MOVING_AVG,
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    ];
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    /** @var string */
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    private $trendLineType = 'linear'; // TRENDLINE_LINEAR
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    /** @var int */
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    private $order = 2;
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    /** @var int */
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    private $period = 3;
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    /** @var bool */
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    private $dispRSqr = false;
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    /** @var bool */
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    private $dispEq = false;
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    /** @var string */
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    private $name = '';
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    /** @var float */
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    private $backward = 0.0;
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    /** @var float */
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    private $forward = 0.0;
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    /** @var float */
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    private $intercept = 0.0;
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    /**
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     * Create a new TrendLine object.
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     */
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    public function __construct(
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        string $trendLineType = '',
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        ?int $order = null,
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        ?int $period = null,
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        bool $dispRSqr = false,
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        bool $dispEq = false,
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        ?float $backward = null,
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        ?float $forward = null,
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        ?float $intercept = null,
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        ?string $name = null
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    ) {
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        parent::__construct();
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        $this->setTrendLineProperties(
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            $trendLineType,
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            $order,
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            $period,
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            $dispRSqr,
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            $dispEq,
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            $backward,
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            $forward,
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            $intercept,
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            $name
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        );
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    }
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    public function getTrendLineType(): string
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    {
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        return $this->trendLineType;
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    }
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    public function setTrendLineType(string $trendLineType): self
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    {
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        $this->trendLineType = $trendLineType;
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        return $this;
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    }
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    public function getOrder(): int
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    {
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        return $this->order;
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    }
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    public function setOrder(int $order): self
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    {
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        $this->order = $order;
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        return $this;
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    }
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    public function getPeriod(): int
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    {
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        return $this->period;
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    }
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    public function setPeriod(int $period): self
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    {
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        $this->period = $period;
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        return $this;
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    }
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    public function getDispRSqr(): bool
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    {
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        return $this->dispRSqr;
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    }
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    public function setDispRSqr(bool $dispRSqr): self
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    {
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        $this->dispRSqr = $dispRSqr;
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        return $this;
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    }
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    public function getDispEq(): bool
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    {
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        return $this->dispEq;
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    }
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    public function setDispEq(bool $dispEq): self
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    {
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        $this->dispEq = $dispEq;
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        return $this;
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    }
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    public function getName(): string
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    {
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        return $this->name;
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    }
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    public function setName(string $name): self
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    {
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        $this->name = $name;
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        return $this;
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    }
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    public function getBackward(): float
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    {
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        return $this->backward;
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    }
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    public function setBackward(float $backward): self
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    {
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        $this->backward = $backward;
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        return $this;
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    }
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    public function getForward(): float
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    {
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        return $this->forward;
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    }
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    public function setForward(float $forward): self
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    {
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        $this->forward = $forward;
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        return $this;
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    }
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    public function getIntercept(): float
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    {
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        return $this->intercept;
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    }
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    public function setIntercept(float $intercept): self
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    {
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        $this->intercept = $intercept;
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        return $this;
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    }
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    public function setTrendLineProperties(
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        ?string $trendLineType = null,
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        ?int $order = 0,
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        ?int $period = 0,
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        ?bool $dispRSqr = false,
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        ?bool $dispEq = false,
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        ?float $backward = null,
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        ?float $forward = null,
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        ?float $intercept = null,
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        ?string $name = null
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    ): self {
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        if (!empty($trendLineType)) {
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            $this->setTrendLineType($trendLineType);
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        }
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        if ($order !== null) {
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            $this->setOrder($order);
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        }
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        if ($period !== null) {
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            $this->setPeriod($period);
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        }
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        if ($dispRSqr !== null) {
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            $this->setDispRSqr($dispRSqr);
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        }
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        if ($dispEq !== null) {
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            $this->setDispEq($dispEq);
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        }
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        if ($backward !== null) {
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            $this->setBackward($backward);
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        }
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        if ($forward !== null) {
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            $this->setForward($forward);
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        }
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        if ($intercept !== null) {
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            $this->setIntercept($intercept);
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        }
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        if ($name !== null) {
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            $this->setName($name);
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        }
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        return $this;
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    }
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}