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PhabricatorDemoChartEngine.php
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			<?php

			final class PhabricatorDemoChartEngine
			extends PhabricatorChartEngine {

			const CHARTENGINEKEY = 'facts.demo';

			protected function newChart(PhabricatorFactChart $chart, array $map) {
			$viewer = $this->getViewer();

			$functions = array();

			$function = $this->newFunction(
			array('scale', 0.0001),
			array('cos'),
			array('scale', 128),
			array('shift', 256));

			$function->getFunctionLabel()
			->setKey('cos-x')
			->setName(pht('cos(x)'))
			->setColor('rgba(0, 200, 0, 1)')
			->setFillColor('rgba(0, 200, 0, 0.15)');

			$functions[] = $function;

			$function = $this->newFunction(
			array('constant', 345));

			$function->getFunctionLabel()
			->setKey('constant-345')
			->setName(pht('constant(345)'))
			->setColor('rgba(0, 0, 200, 1)')
			->setFillColor('rgba(0, 0, 200, 0.15)');

			$functions[] = $function;

			$datasets = array();

			$datasets[] = id(new PhabricatorChartStackedAreaDataset())
			->setFunctions($functions);

			$chart->attachDatasets($datasets);
			}

			}