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Chart.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!');

	/*! \mainpage Libchart
	*
	* This is the reference API, automatically compiled by <a href="http://www.stack.nl/~dimitri/doxygen/">Doxygen</a>.
	* You can find here information that is not covered by the <a href="../samplecode/">tutorial</a>.
	*
	*/

	/**
	* Base chart class.
	*
	* @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
	*/
	abstract class LibchartChart {
	/**
	* The data set.
	*/
	protected $dataSet;

	/**
	* Plot (holds graphical attributes).
	*/
	protected $plot;

	/**
	* Abstract constructor of Chart.
	*
	* @param integer width of the image
	* @param integer height of the image
	*/
	protected function __construct($width, $height) {
	// Creates the plot
	$this->plot = new LibchartPlot($width, $height);
	$this->plot->setTitle("Untitled chart");
	$this->plot->setLogoFileName(dirname(__FILE__) . "/../../../images/PoweredBy.png");
	}

	/**
	* Checks the data model before rendering the graph.
	*/
	protected function checkDataModel() {
	// Check if a dataset was defined
	if (!$this->dataSet) {
	die("Error: No dataset defined.");
	}

	// Maybe no points are defined, but that's ok. This will yield and empty graph with default boundaries.
	}

	/**
	* Create the image.
	*/
	protected function createImage() {
	$this->plot->createImage();
	}

	/**
	* Sets the data set.
	*
	* @param DataSet The data set
	*/
	public function setDataSet($dataSet) {
	$this->dataSet = $dataSet;
	}

	/**
	* Return the plot.
	*
	* @return plot
	*/
	public function getPlot() {
	return $this->plot;
	}

	/**
	* Sets the title.
	*
	* @param string New title
	*/
	public function setTitle($title) {
	$this->plot->setTitle($title);
	}
	}

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