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Created: Thu, Sep 25, 10:33 PM

BarChart.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!');

	/**
	* Base abstract class for rendering both horizontal and vertical bar charts.
	*
	* @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
	*/
	abstract class LibchartBarChart extends LibchartChart {
	protected $bound;
	protected $axis;
	protected $hasSeveralSerie;

	/**
	* Creates a new bar chart.
	*
	* @param integer width of the image
	* @param integer height of the image
	*/
	protected function __construct($width, $height) {
	parent::__construct($width, $height);

	// Initialize the bounds
	$this->bound = new LibchartBound();
	$this->bound->setLowerBound(0);
	}

	/**
	* Compute the axis.
	*/
	protected function computeAxis() {
	$this->axis = new LibchartAxis($this->bound->getYMinValue(), $this->bound->getYMaxValue());
	$this->axis->computeBoundaries();
	}

	/**
	* Create the image.
	*/
	protected function createImage() {
	parent::createImage();

	// Get graphical obects
	$img = $this->plot->getImg();
	$palette = $this->plot->getPalette();
	$text = $this->plot->getText();
	$primitive = $this->plot->getPrimitive();

	// Get the graph area
	$graphArea = $this->plot->getGraphArea();

	// Aqua-like background
	for ($i = $graphArea->y1; $i < $graphArea->y2; $i++) {
	$color = $palette->aquaColor[($i + 3) % 4];
	$primitive->line($graphArea->x1, $i, $graphArea->x2, $i, $color);
	}

	// Axis
	imagerectangle($img, $graphArea->x1 - 1, $graphArea->y1, $graphArea->x1, $graphArea->y2, $palette->axisColor[0]->getColor($img));
	imagerectangle($img, $graphArea->x1 - 1, $graphArea->y2, $graphArea->x2, $graphArea->y2 + 1, $palette->axisColor[0]->getColor($img));
	}

	/**
	* Returns true if the data set has some data.
	* @param minNumberOfPoint Minimum number of points (1 for bars, 2 for lines).
	*
	* @return true if data set empty
	*/
	protected function isEmptyDataSet($minNumberOfPoint) {
	if ($this->dataSet instanceof LibchartXYDataSet) {
	$pointList = $this->dataSet->getPointList();
	$pointCount = count($pointList);
	return $pointCount < $minNumberOfPoint;
	} else if ($this->dataSet instanceof LibchartXYSeriesDataSet) {
	$serieList = $this->dataSet->getSerieList();
	reset($serieList);
	if (count($serieList) > 0) {
	$serie = current($serieList);
	$pointList = $serie->getPointList();
	$pointCount = count($pointList);
	return $pointCount < $minNumberOfPoint;
	}
	} else {
	die("Error: unknown dataset type");
	}
	}

	/**
	* 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.");
	}

	// Bar charts accept both XYDataSet and XYSeriesDataSet
	if ($this->dataSet instanceof LibchartXYDataSet) {
	// The dataset contains only one serie
	$this->hasSeveralSerie = false;
	} else if ($this->dataSet instanceof LibchartXYSeriesDataSet) {
	// Check if each series has the same number of points
	unset($lastPointCount);
	$serieList = $this->dataSet->getSerieList();
	for ($i = 0; $i < count($serieList); $i++) {
	$serie = $serieList[$i];
	$pointCount = count($serie->getPointList());
	if (isset($lastPointCount) && $pointCount != $lastPointCount) {
	die("Error: serie <" . $i . "> doesn't have the same number of points as last serie (last one: <" . $lastPointCount. ">, this one: <" . $pointCount. ">).");
	}
	$lastPointCount = $pointCount;
	}

	// The dataset contains several series
	$this->hasSeveralSerie = true;
	} else {
	die("Error: Bar chart accept only XYDataSet and XYSeriesDataSet");
	}
	}

	/**
	* Return the data as a series list (for consistency).
	*
	* @return List of series
	*/
	protected function getDataAsSerieList() {
	// Get the data as a series list
	$serieList = null;
	if ($this->dataSet instanceof LibchartXYSeriesDataSet) {
	$serieList = $this->dataSet->getSerieList();
	} else if ($this->dataSet instanceof LibchartXYDataSet) {
	$serieList = array();
	array_push($serieList, $this->dataSet);
	}

	return $serieList;
	}

	/**
	* Return the first serie of the list, or the dataSet itself if there is no serie.
	*
	* @return XYDataSet
	*/
	protected function getFirstSerieOfList() {
	$pointList = null;
	if ($this->dataSet instanceof LibchartXYSeriesDataSet) {
	// For a series dataset, print the legend from the first serie
	$serieList = $this->dataSet->getSerieList();
	reset($serieList);
	$serie = current($serieList);
	$pointList = $serie->getPointList();
	} else if ($this->dataSet instanceof LibchartXYDataSet) {
	$pointList = $this->dataSet->getPointList();
	}

	return $pointList;
	}
	}

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