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<?php
/** Libchart - PHP chart library
*
* Copyright (C) 2005-2006 Jean-Marc Tr�meaux (jm.tremeaux at gmail.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
/**
* Base bar chart class (horizontal or vertical)
*
* @author Jean-Marc Tr�meaux (jm.tremeaux at gmail.com)
* @abstract
*/
class BarChart extends Chart
{
/**
* Creates a new bar chart
*
* @access protected
* @param integer width of the image
* @param integer height of the image
*/
function BarChart($width, $height)
{
parent::Chart($width, $height);
$this->setMargin(5);
$this->setLowerBound(0);
}
/**
* Compute the boundaries on the axis
*
* @access protected
*/
function computeBound()
{
// Compute lower and upper bound on the value axis
$point = current($this->point);
// Check if some points were defined
if(!$point)
{
$yMin = 0;
$yMax = 1;
}
else
{
$yMax = $yMin = $point->getY();
foreach($this->point as $point)
{
$y = $point->getY();
if($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;
// Compute boundaries on the sample axis
$this->sampleCount = count($this->point);
}
/**
* Set manually the lower boundary value (overrides the automatic formatting)
* Typical usage is to set the bars starting from zero
*
* @access public
* @param double lower boundary value
*/
function setLowerBound($lowerBound)
{
$this->lowerBound = $lowerBound;
}
/**
* Set manually the upper boundary value (overrides the automatic formatting)
*
* @access public
* @param double upper boundary value
*/
function setUpperBound($upperBound)
{
$this->upperBound = $upperBound;
}
/**
* Compute the image layout
*
* @access protected
*/
function computeLabelMargin()
{
$this->axis = new Axis($this->yMinValue, $this->yMaxValue);
$this->axis->computeBoundaries();
$this->graphTLX = $this->margin + $this->labelMarginLeft;
$this->graphTLY = $this->margin + $this->labelMarginTop;
$this->graphBRX = $this->width - $this->margin - $this->labelMarginRight;
$this->graphBRY = $this->height - $this->margin - $this->labelMarginBottom;
}
/**
* Create the image
*
* @access protected
*/
function createImage()
{
parent::createImage();
$this->axisColor1 = new Color(201, 201, 201);
$this->axisColor2 = new Color(158, 158, 158);
$this->aquaColor1 = new Color(242, 242, 242);
$this->aquaColor2 = new Color(231, 231, 231);
$this->aquaColor3 = new Color(239, 239, 239);
$this->aquaColor4 = new Color(253, 253, 253);
$this->barColor1 = new Color(42, 71, 181);
$this->barColor2 = new Color(33, 56, 143);
$this->barColor3 = new Color(172, 172, 210);
$this->barColor4 = new Color(117, 117, 143);
// Aqua-like background
$aquaColor = Array($this->aquaColor1, $this->aquaColor2, $this->aquaColor3, $this->aquaColor4);
for($i = $this->graphTLY; $i < $this->graphBRY; $i++)
{
$color = $aquaColor[($i + 3) % 4];
$this->primitive->line($this->graphTLX, $i, $this->graphBRX, $i, $color);
}
// Axis
imagerectangle($this->img, $this->graphTLX - 1, $this->graphTLY, $this->graphTLX, $this->graphBRY, $this->axisColor1->getColor($this->img));
imagerectangle($this->img, $this->graphTLX - 1, $this->graphBRY, $this->graphBRX, $this->graphBRY + 1, $this->axisColor1->getColor($this->img));
}
}
?>
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