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LineChart.php
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Tue, Sep 23, 3:33 AM

LineChart.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!');
/**
* Line chart.
*
* @author Jean-Marc Trémeaux (jm.tremeaux at gmail.com)
*/
class LibchartLineChart extends LibchartBarChart {
/**
* Creates a new line chart.
* Line charts allow for XYDataSet and XYSeriesDataSet in order to plot several lines.
*
* @param integer width of the image
* @param integer height of the image
*/
public function __construct($width = 600, $height = 250) {
parent::__construct($width, $height);
$this->plot->setGraphPadding(new LibchartPadding(5, 30, 50, 50));
}
/**
* Computes the layout.
*/
protected function computeLayout() {
if ($this->hasSeveralSerie) {
$this->plot->setHasCaption(true);
}
$this->plot->computeLayout();
}
/**
* Print the axis.
*/
protected function printAxis() {
$minValue = $this->axis->getLowerBoundary();
$maxValue = $this->axis->getUpperBoundary();
$stepValue = $this->axis->getTics();
// Get graphical obects
$img = $this->plot->getImg();
$palette = $this->plot->getPalette();
$text = $this->plot->getText();
// Get the graph area
$graphArea = $this->plot->getGraphArea();
// Vertical axis
for ($value = $minValue; $value <= $maxValue; $value += $stepValue) {
$y = $graphArea->y2 - ($value - $minValue) * ($graphArea->y2 - $graphArea->y1) / ($this->axis->displayDelta);
imagerectangle($img, $graphArea->x1 - 3, $y, $graphArea->x1 - 2, $y + 1, $palette->axisColor[0]->getColor($img));
imagerectangle($img, $graphArea->x1 - 1, $y, $graphArea->x1, $y + 1, $palette->axisColor[1]->getColor($img));
$text->printText($img, $graphArea->x1 - 5, $y, $this->plot->getTextColor(), $value, $text->fontCondensed, $text->HORIZONTAL_RIGHT_ALIGN | $text->VERTICAL_CENTER_ALIGN);
}
// Get first serie of a list
$pointList = $this->getFirstSerieOfList();
// Horizontal Axis
$pointCount = count($pointList);
reset($pointList);
$columnWidth = ($graphArea->x2 - $graphArea->x1) / ($pointCount - 1);
for ($i = 0; $i < $pointCount; $i++) {
$x = $graphArea->x1 + $i * $columnWidth;
imagerectangle($img, $x - 1, $graphArea->y2 + 2, $x, $graphArea->y2 + 3, $palette->axisColor[0]->getColor($img));
imagerectangle($img, $x - 1, $graphArea->y2, $x, $graphArea->y2 + 1, $palette->axisColor[1]->getColor($img));
$point = current($pointList);
next($pointList);
$label = $point->getX();
$text->printDiagonal($img, $x - 5, $graphArea->y2 + 10, $this->plot->getTextColor(), $label);
}
}
/**
* Print the lines.
*/
protected function printLine() {
$minValue = $this->axis->getLowerBoundary();
$maxValue = $this->axis->getUpperBoundary();
// Get the data as a list of series for consistency
$serieList = $this->getDataAsSerieList();
// 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();
$lineColorSet = $palette->lineColorSet;
$lineColorSet->reset();
for ($j = 0; $j < count($serieList); $j++) {
$serie = $serieList[$j];
$pointList = $serie->getPointList();
$pointCount = count($pointList);
reset($pointList);
$columnWidth = ($graphArea->x2 - $graphArea->x1) / ($pointCount - 1);
$lineColor = $lineColorSet->currentColor();
$lineColorShadow = $lineColorSet->currentShadowColor();
$lineColorSet->next();
$x1 = null;
$y1 = null;
for ($i = 0; $i < $pointCount; $i++) {
$x2 = $graphArea->x1 + $i * $columnWidth;
$point = current($pointList);
next($pointList);
$value = $point->getY();
$y2 = $graphArea->y2 - ($value - $minValue) * ($graphArea->y2 - $graphArea->y1) / ($this->axis->displayDelta);
// Draw line
if ($x1) {
$primitive->line($x1, $y1, $x2, $y2, $lineColor, 4);
$primitive->line($x1, $y1 - 1, $x2, $y2 - 1, $lineColorShadow, 2);
}
$x1 = $x2;
$y1 = $y2;
}
}
}
/**
* Renders the caption.
*/
protected function printCaption() {
// Get the list of labels
$labelList = $this->dataSet->getTitleList();
// Create the caption
$caption = new LibchartCaption();
$caption->setPlot($this->plot);
$caption->setLabelList($labelList);
$palette = $this->plot->getPalette();
$lineColorSet = $palette->lineColorSet;
$caption->setColorSet($lineColorSet);
// Render the caption
$caption->render();
}
/**
* Render the chart image.
*
* @param string name of the file to render the image to (optional)
*/
public function render($fileName = null) {
// Check the data model
$this->checkDataModel();
$this->bound->computeBound($this->dataSet);
$this->computeAxis();
$this->computeLayout();
$this->createImage();
$this->plot->printLogo();
$this->plot->printTitle();
if (!$this->isEmptyDataSet(2)) {
$this->printAxis();
$this->printLine();
if ($this->hasSeveralSerie) {
$this->printCaption();
}
}
$this->plot->render($fileName);
}
}

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