It is very easy since all parameters you set to report will be available in settings() and setup(). For example, you build a DynamicReport which will receive 2 parameters, first is the csvFile and second is the year for Filter. You will initiate report like this:

$report = new DynamicReport([
    "csvFile"=>"../data/sale.csv",
    "year"=>2018
]);
$report->run()->render();

Your DynamicReport.php will be something like this:

class DynamicReport extends \koolreport\KoolReport
{
    function settings()
    {
        return [
            "dataSources"=>[
                "csvData"=>[
                    "class"=>'\koolreport\datasources\CSVDataSource',
                    'filePath'=>$this->params["csvFile"]
                ]
            ]
        ];
    }

    function setup()
    {
        $this->src("csvData")->pipe(new \koolreport\processes\Filter([
            "year"=>$this->params["year"]
        ]))
        ->pipe($this->dataStore("result"));
    }
}

Hope that helps.

You do:

//Save the parameter year
$year = $this->params["year"];

$this->src("source")->query("....")
->pipe(new CalculatedColumn([
    "duration"=>function($row) use($year) {
        return 2020 - $year;
    }
]))

you will have new column name "duration" with value = 2020 - year parameter

Yes, at the view of report, you still can use $this->params["year"]

Great