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<?php
/**
* File containing the abstract ezcGraphChartElementLegend 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 legend as a chart element
*
* @package Graph
*/
class ezcGraphChartElementLegend extends ezcGraphChartElement
{
/**
* Contains data which should be shown in the legend
* array(
* array(
* 'label' => (string) 'Label of data element',
* 'color' => (ezcGraphColor) $color,
* 'symbol' => (integer) ezcGraph::DIAMOND,
* ),
* ...
* )
*
* @var array
*/
protected $labels;
/**
* Size of a portrait style legend in percent of the size of the complete
* chart
*
* @var float
*/
protected $portraitSize = .2;
/**
* Size of a landscape style legend in percent of the size of the complete
* chart
*
* @var float
*/
protected $landscapeSize = .1;
/**
* Standard size of symbols and text in legends
*
* @var integer
*/
protected $symbolSize = 14;
/**
* Padding for label elements
*
* @var integer
*/
protected $padding = 1;
/**
* Scale symbol size up to to percent of complete legends size for very
* big legends
*
* @var float
*/
protected $minimumSymbolSize = .05;
/**
* Space between lael elements in pixel
*
* @var integer
*/
protected $spacing = 2;
/**
* __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 'padding':
$this->padding = max( 0, (int) $propertyValue );
break;
case 'symbolSize':
$this->symbolSize = max( 1, (int) $propertyValue );
break;
case 'landscapeSize':
$this->landscapeSize = max( 0, min( 1, (float) $propertyValue ) );
break;
case 'portraitSize':
$this->portraitSize = max( 0, min( 1, (float) $propertyValue ) );
break;
case 'spacing':
$this->portraitSize = max( 0, (int) $propertyValue );
break;
default:
parent::__set( $propertyName, $propertyValue );
break;
}
}
/**
* Generate legend from several datasets with on entry per dataset
*
* @param array $datasets
* @return void
*/
public function generateFromDatasets(array $datasets)
{
$this->labels = array();
foreach ($datasets as $dataset)
{
$this->labels[] = array(
'label' => $dataset->label->default,
'color' => $dataset->color->default,
'symbol' => ( $dataset->symbol->default === null ?
ezcGraph::NO_SYMBOL :
$dataset->symbol->default ),
);
}
}
/**
* Generate legend from single dataset with on entry per data element
*
* @param ezcGraphDataset $dataset
* @return void
*/
public function generateFromDataset(ezcGraphDataset $dataset)
{
$this->labels = array();
foreach ($dataset as $label => $data)
{
$this->labels[] = array(
'label' => $label,
'color' => $dataset->color[$label],
'symbol' => ( $dataset->symbol[$label] === null ?
ezcGraph::NO_SYMBOL :
$dataset->symbol[$label] ),
);
}
}
protected function calculateBoundings( ezcGraphBoundings $boundings )
{
switch ( $this->position )
{
case ezcGraph::TOP:
$this->boundings = clone $boundings;
$size = (int) round( $boundings->y0 + ( $boundings->y1 - $boundings->y0) * $this->landscapeSize );
$this->boundings->y1 = $size;
$boundings->y0 = $size;
break;
case ezcGraph::LEFT:
$this->boundings = clone $boundings;
$size = (int) round( $boundings->x0 + ( $boundings->x1 - $boundings->x0) * $this->portraitSize );
$this->boundings->x1 = $size;
$boundings->x0 = $size;
break;
case ezcGraph::RIGHT:
$this->boundings = clone $boundings;
$size = (int) round( $boundings->x1 - ( $boundings->x1 - $boundings->x0) * $this->portraitSize );
$this->boundings->x0 = $size;
$boundings->x1 = $size;
break;
case ezcGraph::BOTTOM:
$this->boundings = clone $boundings;
$size = (int) round( $boundings->y1 - ( $boundings->y1 - $boundings->y0) * $this->landscapeSize );
$this->boundings->y0 = $size;
$boundings->y1 = $size;
break;
}
return $boundings;
}
protected function renderLegend( ezcGraphRenderer $renderer )
{
switch ( $this->position )
{
case ezcGraph::LEFT:
case ezcGraph::RIGHT:
$symbolSize = (int) round( min(
max(
$this->symbolSize,
( $this->boundings->y1 - $this->boundings->y0 ) * $this->minimumSymbolSize
),
( $this->boundings->y1 - $this->boundings->y0 ) / count( $this->labels )
) );
foreach ( $this->labels as $labelNr => $label )
{
$renderer->drawSymbol(
$label['color'],
new ezcGraphCoordinate(
$this->boundings->x0 + $this->padding,
$this->boundings->y0 + $labelNr * ( $symbolSize + $this->spacing ) + $this->padding
),
$symbolSize - 2 * $this->padding,
$symbolSize - 2 * $this->padding,
$label['symbol']
);
$renderer->drawTextBox(
new ezcGraphCoordinate(
$this->boundings->x0 + $symbolSize + $this->spacing,
$this->boundings->y0 + $labelNr * ( $symbolSize + $this->spacing ) + $this->padding
),
$label['label'],
$this->boundings->x1 - $this->boundings->x0 - $symbolSize - $this->padding - $this->spacing,
$symbolSize - 2 * $this->padding,
ezcGraph::LEFT | ezcGraph::MIDDLE
);
}
break;
case ezcGraph::TOP:
case ezcGraph::BOTTOM:
$symbolSize = (int) round( min(
$this->symbolSize,
( $this->boundings->y1 - $this->boundings->y0 )
) );
$width = (int) round( ( $this->boundings->x1 - $this->boundings->x0 ) / count( $this->labels ) );
foreach ( $this->labels as $labelNr => $label )
{
$renderer->drawSymbol(
$label['color'],
new ezcGraphCoordinate(
$this->boundings->x0 + $labelNr * $width + $this->padding,
$this->boundings->y0 + $this->padding
),
$symbolSize - 2 * $this->padding,
$symbolSize - 2 * $this->padding,
$label['symbol']
);
$renderer->drawTextBox(
new ezcGraphCoordinate(
$this->boundings->x0 + $labelNr * $width + $this->padding + $symbolSize + $this->spacing,
$this->boundings->y0 + $this->padding
),
$label['label'],
$width - $this->padding - $symbolSize - $this->spacing,
$symbolSize - 2 * $this->padding,
ezcGraph::LEFT | ezcGraph::MIDDLE
);
}
break;
}
}
/**
* Render a legend
*
* @param ezcGraphRenderer $renderer
* @access public
* @return void
*/
public function render( ezcGraphRenderer $renderer, ezcGraphBoundings $boundings )
{
$boundings = $this->calculateBoundings( $boundings );
// Render standard elements
$this->renderBorder( $renderer );
$this->renderBackground( $renderer );
$this->renderTitle( $renderer );
// Render legend
$this->renderLegend( $renderer );
return $boundings;
}
}
?>
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