PhabricatorSumChartFunction.php
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PhabricatorSumChartFunction.php
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	<?php

	final class PhabricatorSumChartFunction
	extends PhabricatorHigherOrderChartFunction {

	const FUNCTIONKEY = 'sum';

	protected function newArguments() {
	return array(
	$this->newArgument()
	->setName('f')
	->setType('function')
	->setRepeatable(true),
	);
	}

	public function evaluateFunction(array $xv) {
	$fv = array();
	foreach ($this->getFunctionArguments() as $function) {
	$fv[] = $function->evaluateFunction($xv);
	}

	$n = count($xv);
	$yv = array_fill(0, $n, null);

	foreach ($fv as $f) {
	for ($ii = 0; $ii < $n; $ii++) {
	if ($f[$ii] !== null) {
	if (!isset($yv[$ii])) {
	$yv[$ii] = 0;
	}
	$yv[$ii] += $f[$ii];
	}
	}
	}

	return $yv;
	}

	}