--- /dev/null
+<?php
+ /* Libchart - PHP chart library
+ * Copyright (C) 2005-2008 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/>.
+ *
+ */
+
+ /**
+ * Base abstract class for rendering both horizontal and vertical bar charts.
+ *
+ * @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
+ */
+ abstract class BarChart extends Chart {
+ protected $bound;
+ protected $axis;
+ protected $hasSeveralSerie;
+
+ /**
+ * Creates a new bar chart.
+ *
+ * @param integer width of the image
+ * @param integer height of the image
+ */
+ protected function BarChart($width, $height) {
+ parent::Chart($width, $height);
+
+ // Initialize the bounds
+ $this->bound = new Bound();
+ $this->bound->setLowerBound(0);
+ }
+
+ /**
+ * Compute the axis.
+ */
+ protected function computeAxis() {
+ $this->axis = new Axis($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 XYDataSet) {
+ $pointList = $this->dataSet->getPointList();
+ $pointCount = count($pointList);
+ return $pointCount < $minNumberOfPoint;
+ } else if ($this->dataSet instanceof XYSeriesDataSet) {
+ $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 XYDataSet) {
+ // The dataset contains only one serie
+ $this->hasSeveralSerie = false;
+ } else if ($this->dataSet instanceof XYSeriesDataSet) {
+ // 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 XYSeriesDataSet) {
+ $serieList = $this->dataSet->getSerieList();
+ } else if ($this->dataSet instanceof XYDataSet) {
+ $serieList = array();
+ array_push($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 XYSeriesDataSet) {
+ // 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 XYDataSet) {
+ $pointList = $this->dataSet->getPointList();
+ }
+
+ return $pointList;
+ }
+
+ /**
+ * Retourns the bound.
+ *
+ * @return bound Bound
+ */
+ public function getBound() {
+ return $this->bound;
+ }
+ }
+?>
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