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<?php
/**
* File containing the abstract ezcGraphLineChart 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 line chart.
*
* @package Graph
*/
class ezcGraphLineChart extends ezcGraphChart
{
public function __construct( array $options = array() )
{
$this->options = new ezcGraphLineChartOptions( $options );
parent::__construct();
$this->addElement( 'xAxis', new ezcGraphChartElementLabeledAxis() );
$this->elements['xAxis']->position = ezcGraph::LEFT;
$this->addElement( 'yAxis', new ezcGraphChartElementNumericAxis() );
$this->elements['yAxis']->position = ezcGraph::BOTTOM;
}
/**
* Options write access
*
* @throws ezcBasePropertyNotFoundException
* If Option could not be found
* @throws ezcBaseValueException
* If value is out of range
* @param mixed $propertyName Option name
* @param mixed $propertyValue Option value;
* @return mixed
*/
public function __set( $propertyName, $propertyValue )
{
switch ( $propertyName ) {
case 'xAxis':
if ( $propertyValue instanceof ezcGraphChartElementAxis )
{
$this->addElement( 'xAxis', $propertyValue );
$this->elements['xAxis']->position = ezcGraph::LEFT;
}
else
{
throw new ezcBaseValueException( $propertyName, $propertyValue, 'ezcGraphChartElementAxis' );
}
break;
case 'yAxis':
if ( $propertyValue instanceof ezcGraphChartElementAxis )
{
$this->addElement( 'yAxis', $propertyValue );
$this->elements['yAxis']->position = ezcGraph::BOTTOM;
}
else
{
throw new ezcBaseValueException( $propertyName, $propertyValue, 'ezcGraphChartElementAxis' );
}
break;
default:
parent::__set( $propertyName, $propertyValue );
}
}
protected function renderData( $renderer, $boundings )
{
// Apply axis space
$xAxisSpace = ( $boundings->x1 - $boundings->x0 ) * $this->xAxis->axisSpace;
$yAxisSpace = ( $boundings->y1 - $boundings->y0 ) * $this->yAxis->axisSpace;
$boundings->x0 += $xAxisSpace;
$boundings->x1 -= $xAxisSpace;
$boundings->y0 += $yAxisSpace;
$boundings->y1 -= $yAxisSpace;
$yAxisNullPosition = $this->elements['yAxis']->getCoordinate( false );
$nr = count( $this->data );
foreach ( $this->data as $data )
{
--$nr;
// Determine fill color for dataset
if ( $this->options->fillLines !== false )
{
$fillColor = clone $data->color->default;
$fillColor->alpha = (int) round( ( 255 - $fillColor->alpha ) * ( $this->options->fillLines / 255 ) );
}
else
{
$fillColor = null;
}
// Draw lines for dataset
$lastPoint = false;
foreach ( $data as $key => $value )
{
$point = new ezcGraphCoordinate(
$this->elements['xAxis']->getCoordinate( $key ),
$this->elements['yAxis']->getCoordinate( $value )
);
$renderer->drawDataLine(
$boundings,
$data->color->default,
( $lastPoint === false ? $point : $lastPoint ),
$point,
$nr,
count( $this->data ),
$data->symbol[$key],
$data->color[$key],
$fillColor,
$yAxisNullPosition
);
$lastPoint = $point;
}
}
}
/**
* Render a line chart
*
* @param ezcGraphRenderer $renderer
* @access public
* @return void
*/
public function render( $width, $height, $file = null )
{
// Set image properties in driver
$this->driver->options->width = $width;
$this->driver->options->height = $height;
// Calculate axis scaling and labeling
foreach ( $this->data as $dataset )
{
$labels = array();
$values = array();
foreach ( $dataset as $label => $value )
{
$labels[] = $label;
$values[] = $value;
}
$this->elements['xAxis']->addData( $labels );
$this->elements['yAxis']->addData( $values );
}
$this->elements['xAxis']->calculateAxisBoundings();
$this->elements['yAxis']->calculateAxisBoundings();
// Generate legend
$this->elements['legend']->generateFromDataSets( $this->data );
// Get boundings from parameters
$this->options->width = $width;
$this->options->height = $height;
// Render subelements
$boundings = new ezcGraphBoundings();
$boundings->x1 = $this->options->width;
$boundings->y1 = $this->options->height;
// Render subelements
foreach ( $this->elements as $name => $element )
{
// Skip element, if it should not get rendered
if ( $this->renderElement[$name] === false )
{
continue;
}
// Special settings for special elements
switch ( $name )
{
case 'xAxis':
// get Position of 0 on the Y-axis for orientation of the x-axis
$element->nullPosition = $this->elements['yAxis']->getCoordinate( false );
break;
case 'yAxis':
// get Position of 0 on the X-axis for orientation of the y-axis
$element->nullPosition = $this->elements['xAxis']->getCoordinate( false );
break;
}
$this->driver->options->font = $element->font;
$boundings = $element->render( $this->renderer, $boundings );
}
// Render graph
$this->renderData( $this->renderer, $boundings );
if ( !empty( $file ) )
{
$this->renderer->render( $file );
}
}
}
?>
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