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PhabricatorShiftChartFunction.php
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			<?php

			final class PhabricatorShiftChartFunction
			extends PhabricatorPureChartFunction {

			const FUNCTIONKEY = 'shift';

			protected function newArguments() {
			return array(
			$this->newArgument()
			->setName('shift')
			->setType('number'),
			);
			}

			public function evaluateFunction(array $xv) {
			$shift = $this->getArgument('shift');

			$yv = array();

			foreach ($xv as $x) {
			$yv[] = $x + $shift;
			}

			return $yv;
			}

			}