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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()
{
parent::__construct();
$this->elements['X_axis'] = new ezcGraphChartElementLabeledAxis();
$this->elements['X_axis']->position = ezcGraph::LEFT;
$this->elements['Y_axis'] = new ezcGraphChartElementNumericAxis();
$this->elements['Y_axis']->position = ezcGraph::BOTTOM;
}
protected function renderData( $renderer, $boundings )
{
foreach ( $this->data as $data )
{
$lastPoint = false;
foreach ( $data as $key => $value )
{
$point = new ezcGraphCoordinate(
(int) round( $this->elements['X_axis']->getCoordinate( $boundings, $key ) ),
(int) round( $this->elements['Y_axis']->getCoordinate( $boundings, $value ) )
);
// Draw line
if ( $lastPoint !== false )
{
$renderer->drawLine(
$data->color->default,
$lastPoint,
$point,
true
);
}
// Draw Symbol
$symbol = $data->symbol[$key];
// @TODO: Make config option
$symbolSize = 8;
$symbolPosition = new ezcGraphCoordinate(
$point->x - $symbolSize / 2,
$point->y - $symbolSize / 2
);
if ( $symbol != ezcGraph::NO_SYMBOL )
{
$renderer->drawSymbol(
$data->color[$key],
$symbolPosition,
$symbolSize,
$symbolSize,
$symbol
);
}
$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
$this->elements['X_axis']->calculateFromDataset( $this->data );
$this->elements['X_axis']->font = $this->options->font;
$this->elements['Y_axis']->calculateFromDataset( $this->data );
$this->elements['Y_axis']->font = $this->options->font;
// 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;
foreach ( $this->elements as $name => $element )
{
// Special settings for special elements
switch ( $name )
{
case 'X_axis':
// get Position of 0 on the Y-axis for orientation of the x-axis
$element->nullPosition = $this->elements['Y_axis']->getCoordinate( $boundings, false );
break;
case 'Y_axis':
// get Position of 0 on the X-axis for orientation of the y-axis
$element->nullPosition = $this->elements['X_axis']->getCoordinate( $boundings, 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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