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<?php
/**
* File containing the abstract ezcGraphChartElementNumericAxis class
*
* @package Graph
* @version //autogentag//
* @copyright Copyright (C) 2005, 2006 eZ systems as. All rights reserved.
* @license http://ez.no/licenses/new_bsd New BSD License
*/
/**
* Class to represent a axe as a chart element
*
* @package Graph
*/
class ezcGraphChartElementNumericAxis extends ezcGraphChartElement
{
/**
* Minimum value of displayed scale on axis
*
* @var float
*/
protected $min = false;
/**
* Maximum value of displayed scale on axis
*
* @var float
*/
protected $max = false;
/**
* Labeled major steps displayed on the axis
*
* @var float
*/
protected $majorStep = false;
/**
* Non labeled minor steps on the axis
*
* @var mixed
* @access protected
*/
protected $minorStep = false;
/**
* Constant used for calculation of automatic definition of major scaling
* steps
*/
const MIN_MAJOR_COUNT = 5;
/**
* Constant used for automatic calculation of minor steps from given major
* steps
*/
const MIN_MINOR_COUNT = 8;
/**
* __set
*
* @param mixed $propertyName
* @param mixed $propertyValue
* @throws ezcBaseValueException
* If a submitted parameter was out of range or type.
* @throws ezcBasePropertyNotFoundException
* If a the value for the property options is not an instance of
* @return void
*/
public function __set( $propertyName, $propertyValue )
{
switch ( $propertyName )
{
case 'min':
$this->min = (float) $propertyValue;
break;
case 'max':
$this->max = (float) $propertyValue;
break;
case 'majorStep':
if ( $propertyValue <= 0 )
{
throw new ezcBaseValueException( 'majorStep', $propertyValue, 'float > 0' );
}
$this->majorStep = (float) $propertyValue;
break;
case 'minorStep':
if ( $propertyValue <= 0 )
{
throw new ezcBaseValueException( 'minorStep', $propertyValue, 'float > 0' );
}
$this->minorStep = (float) $propertyValue;
break;
default:
parent::__set( $propertyName, $propertyValue );
break;
}
}
/**
* Returns a "nice" number for a given floating point number.
*
* Nice numbers are steps on a scale which are easily recognized by humans
* like 0.5, 25, 1000 etc.
*
* @param float $float Number to be altered
* @return float Nice number
*/
protected function getNiceNumber( $float )
{
// Get absolute value and save sign
$abs = abs( $float );
$sign = $float / $abs;
// Normalize number to a range between 1 and 10
$log = (int) round( log10( $abs ), 0);
$abs /= pow( 10, $log );
// find next nice number
if ( $abs > 5 ) {
$abs = 10.;
}
elseif ( $abs > 2.5 )
{
$abs = 5.;
}
elseif ( $abs > 1 )
{
$abs = 2.5;
}
else
{
$abs = 1;
}
// unnormalize number to original values
return $abs * pow( 10, $log ) * $sign;
}
/**
* Calculate minimum value for displayed axe basing on real minimum and
* major step size
*
* @param float $min Real data minimum
* @param float $max Real data maximum
* @return void
*/
protected function calculateMinimum( $min, $max )
{
$this->min = floor( $min / $this->majorStep ) * $this->majorStep;
}
/**
* Calculate maximum value for displayed axe basing on real maximum and
* major step size
*
* @param float $min Real data minimum
* @param float $max Real data maximum
* @return void
*/
protected function calculateMaximum( $min, $max )
{
$this->max = ceil( $max / $this->majorStep ) * $this->majorStep;
}
/**
* Calculate size of minor steps based on the size of the major step size
*
* @param float $min Real data minimum
* @param float $max Real data maximum
* @return void
*/
protected function calculateMinorStep( $min, $max )
{
$stepSize = $this->majorStep / self::MIN_MINOR_COUNT;
$this->minorStep = $this->getNiceNumber( $stepSize );
}
/**
* Calculate size of major step based on the span to be displayed and the
* defined MIN_MAJOR_COUNT constant.
*
* @param float $min Real data minimum
* @param float $max Real data maximum
* @return void
*/
protected function calculateMajorStep( $min, $max )
{
$span = $max - $min;
$stepSize = $span / self::MIN_MAJOR_COUNT;
$this->majorStep = $this->getNiceNumber( $stepSize );
}
/**
* Calculate steps, min and max values from given datasets, if not set
* manually before. receives an array of array( ezcGraphDataset )
*
* @param array $datasets
* @return void
*/
public function calculateFromDataset(array $datasets)
{
$min = false;
$max = false;
// Determine minimum and maximum values
foreach ( $datasets as $dataset )
{
foreach ( $dataset as $value )
{
if ( $min === false ||
$value < $min )
{
$min = $value;
}
if ( $max === false ||
$value > $max )
{
$max = $value;
}
}
}
// Calculate "nice" values for scaling parameters
if ( $this->majorStep === false )
{
$this->calculateMajorStep( $min, $max );
}
if ( $this->minorStep === false )
{
$this->calculateMinorStep( $min, $max );
}
if ( $this->min === false )
{
$this->calculateMinimum( $min, $max );
}
if ( $this->max === false )
{
$this->calculateMaximum( $min, $max );
}
}
/**
* Render an axe
*
* @param ezcGraphRenderer $renderer
* @access public
* @return void
*/
public function render( ezcGraphBoundings $boundings )
{
return $boundings;
}
}
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