<?php

namespace PhpOffice\PhpSpreadsheet\Chart;

class TrendLine extends Properties
{
    const TRENDLINE_EXPONENTIAL = 'exp';
    const TRENDLINE_LINEAR = 'linear';
    const TRENDLINE_LOGARITHMIC = 'log';
    const TRENDLINE_POLYNOMIAL = 'poly'; // + 'order'
    const TRENDLINE_POWER = 'power';
    const TRENDLINE_MOVING_AVG = 'movingAvg'; // + 'period'
    const TRENDLINE_TYPES = [
        self::TRENDLINE_EXPONENTIAL,
        self::TRENDLINE_LINEAR,
        self::TRENDLINE_LOGARITHMIC,
        self::TRENDLINE_POLYNOMIAL,
        self::TRENDLINE_POWER,
        self::TRENDLINE_MOVING_AVG,
    ];

    /** @var string */
    private $trendLineType = 'linear'; // TRENDLINE_LINEAR

    /** @var int */
    private $order = 2;

    /** @var int */
    private $period = 3;

    /** @var bool */
    private $dispRSqr = false;

    /** @var bool */
    private $dispEq = false;

    /** @var string */
    private $name = '';

    /** @var float */
    private $backward = 0.0;

    /** @var float */
    private $forward = 0.0;

    /** @var float */
    private $intercept = 0.0;

    /**
     * Create a new TrendLine object.
     */
    public function __construct(
        string $trendLineType = '',
        ?int $order = null,
        ?int $period = null,
        bool $dispRSqr = false,
        bool $dispEq = false,
        ?float $backward = null,
        ?float $forward = null,
        ?float $intercept = null,
        ?string $name = null
    ) {
        parent::__construct();
        $this->setTrendLineProperties(
            $trendLineType,
            $order,
            $period,
            $dispRSqr,
            $dispEq,
            $backward,
            $forward,
            $intercept,
            $name
        );
    }

    public function getTrendLineType(): string
    {
        return $this->trendLineType;
    }

    public function setTrendLineType(string $trendLineType): self
    {
        $this->trendLineType = $trendLineType;

        return $this;
    }

    public function getOrder(): int
    {
        return $this->order;
    }

    public function setOrder(int $order): self
    {
        $this->order = $order;

        return $this;
    }

    public function getPeriod(): int
    {
        return $this->period;
    }

    public function setPeriod(int $period): self
    {
        $this->period = $period;

        return $this;
    }

    public function getDispRSqr(): bool
    {
        return $this->dispRSqr;
    }

    public function setDispRSqr(bool $dispRSqr): self
    {
        $this->dispRSqr = $dispRSqr;

        return $this;
    }

    public function getDispEq(): bool
    {
        return $this->dispEq;
    }

    public function setDispEq(bool $dispEq): self
    {
        $this->dispEq = $dispEq;

        return $this;
    }

    public function getName(): string
    {
        return $this->name;
    }

    public function setName(string $name): self
    {
        $this->name = $name;

        return $this;
    }

    public function getBackward(): float
    {
        return $this->backward;
    }

    public function setBackward(float $backward): self
    {
        $this->backward = $backward;

        return $this;
    }

    public function getForward(): float
    {
        return $this->forward;
    }

    public function setForward(float $forward): self
    {
        $this->forward = $forward;

        return $this;
    }

    public function getIntercept(): float
    {
        return $this->intercept;
    }

    public function setIntercept(float $intercept): self
    {
        $this->intercept = $intercept;

        return $this;
    }

    public function setTrendLineProperties(
        ?string $trendLineType = null,
        ?int $order = 0,
        ?int $period = 0,
        ?bool $dispRSqr = false,
        ?bool $dispEq = false,
        ?float $backward = null,
        ?float $forward = null,
        ?float $intercept = null,
        ?string $name = null
    ): self {
        if (!empty($trendLineType)) {
            $this->setTrendLineType($trendLineType);
        }
        if ($order !== null) {
            $this->setOrder($order);
        }
        if ($period !== null) {
            $this->setPeriod($period);
        }
        if ($dispRSqr !== null) {
            $this->setDispRSqr($dispRSqr);
        }
        if ($dispEq !== null) {
            $this->setDispEq($dispEq);
        }
        if ($backward !== null) {
            $this->setBackward($backward);
        }
        if ($forward !== null) {
            $this->setForward($forward);
        }
        if ($intercept !== null) {
            $this->setIntercept($intercept);
        }
        if ($name !== null) {
            $this->setName($name);
        }

        return $this;
    }
}

• [D] Renderer
• [F] Axis.php
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• [F] AxisText.php
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• [F] Chart.php
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• [F] ChartColor.php
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• [F] DataSeries.php
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• [F] Exception.php
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• [F] GridLines.php
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• [F] Layout.php
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• [F] Legend.php
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• [F] PlotArea.php
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• [F] Properties.php
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• [F] Title.php
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• [F] TrendLine.php
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<?php
                            
 require_once('vendor/autoload.php');
                            
 $client = new \GuzzleHttp\Client();
                            
 $response = $client->request('POST', $base_url. 'v1/generate-token', [
                            
'headers' => [
                            
  'accept' => 'application/json',
                            
  'content-type' => 'application/json',
                            
 ],
                            
'form_params' => [
                            
  'client_id'     => '$client_id',
                            
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echo $response->getBody();
                        
                    
                

                    
                        
**Response: SUCCESS (200 OK)**
                        
{
                        
 "message": {
                        
 "success": [
                        
  "Successfully token is generated"
                        
 ]
                        
},
                        
"data": {
                        
 "token":"eyJpdiI6InpkczhjTjhQdVhUL2lKQ0pSUUx6aUE9P
SIsInZhbHVlIjoiVGVBTVBDTXltbjNZcEIvdEJveGpTSno3TU5NRUtn
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kzYzk0YzljNmVmNjE0YWI0ZDIwOGI3NDQ2YWEyY2ZhNzc0NzE4ZmY1ZmYyMz

                        IyZmQzNDY1IiwidGFnIjoiIn0=",
                        
},
                        
"type": "success"
                        
}
                    
                

                    
                        
**Response: ERROR (400 FAILED)**
                        
{
                        
 "message": {
                        
 "error": [
                        
  "Invalid credentials."
                        
 ]
                        
},
                        
"data": null,
                        
"type": "error"
                        
}