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Bound.php
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	<?php
	/* Libchart - PHP chart library
	* Copyright (C) 2005-2007 Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, either version 3 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	*
	*/

	defined('FULL_PATH') or die('restricted access!');

	/**
	* Object representing the bounds of a dataset (its minimal and maximal values) on its vertical axis.
	* The bounds are automatically calculated from a XYDataSet or XYSeriesDataSet.
	* Default (calculated) bounds can be overriden using the setLowerBound() and setUpperBound() methods.
	*
	* @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
	* Created on 25 july 2007
	*/
	class LibchartBound {
	/**
	* Manually set lower bound, overrides the value calculated by computeBound().
	*/
	private $lowerBound = null;

	/**
	* Manually set upper bound, overrides the value calculated by computeBound().
	*/
	private $upperBound = null;

	/**
	* Computed min bound.
	*/
	private $yMinValue = null;

	/**
	* Computed max bound.
	*/
	private $yMaxValue = null;

	/**
	* Compute the boundaries on the axis.
	*
	* @param dataSet The data set
	*/
	public function computeBound($dataSet) {
	// Check if the data set is empty
	$dataSetEmpty = true;
	$serieList = null;
	if ($dataSet instanceof LibchartXYDataSet) {
	$pointList = $dataSet->getPointList();
	$dataSetEmpty = count($pointList) == 0;

	if (!$dataSetEmpty) {
	// Process it as a serie
	$serieList = array();
	array_push($serieList, $dataSet);
	}
	} else if ($dataSet instanceof LibchartXYSeriesDataSet) {
	$serieList = $dataSet->getSerieList();
	if (count($serieList) > 0) {
	$serie = current($serieList);
	$dataSetEmpty = count($serie) == 0;
	}
	} else {
	die("Error: unknown dataset type");
	}

	// If the dataset is empty, default some bounds
	$yMin = 0;
	$yMax = 1;
	if (!$dataSetEmpty) {
	// Compute lower and upper bound on the value axis
	unset($yMin);
	unset($yMax);

	foreach ($serieList as $serie) {
	foreach ($serie->getPointList() as $point) {
	$y = $point->getY();

	if (!isset($yMin)) {
	$yMin = $y;
	$yMax = $y;
	} else {
	if ($y < $yMin) {
	$yMin = $y;
	}

	if ($y > $yMax) {
	$yMax = $y;
	}
	}
	}
	}
	}

	$this->yMinValue = isset($this->lowerBound) ? $this->lowerBound : $yMin;
	$this->yMaxValue = isset($this->upperBound) ? $this->upperBound : $yMax;
	}

	/**
	* Getter of yMinValue.
	*
	* @return min bound
	*/
	public function getYMinValue() {
	return $this->yMinValue;
	}

	/**
	* Getter of yMaxValue.
	*
	* @return max bound
	*/
	public function getYMaxValue() {
	return $this->yMaxValue;
	}

	/**
	* Set manually the lower boundary value (overrides the automatic formatting).
	* Typical usage is to set the bars starting from zero.
	*
	* @param double lower boundary value
	*/
	public function setLowerBound($lowerBound) {
	$this->lowerBound = $lowerBound;
	}

	/**
	* Set manually the upper boundary value (overrides the automatic formatting).
	*
	* @param double upper boundary value
	*/
	public function setUpperBound($upperBound) {
	$this->upperBound = $upperBound;
	}
	}

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