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<?php
/**
* File containing the abstract ezcGraphChartElementAxis 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
*/
abstract class ezcGraphChartElementAxis extends ezcGraphChartElement
{
/**
* The position of the null value
*
* @var float
*/
protected $nullPosition;
/**
* Percent of the chart space used to display axis labels and arrowheads
* instead of data values
*
* @var float
*/
protected $axisSpace = .1;
/**
* Padding between labels and axis in pixel
*
* @var integer
*/
protected $labelPadding = 2;
/**
* Color of the rastering
*
* @var ezcGraphColor
*/
protected $raster = false;
/**
* Raster minor steps on axis
*
* @var ezcGraphColor
*/
protected $rasterMinor = 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;
/**
* Length of lines for the major steps on the axis
*
* @var integer
*/
protected $majorScalingLineLength = 4;
/**
* Length of lines for the minor steps on the axis
*
* @var integer
*/
protected $minorScalingLineLength = 2;
public function __construct( array $options = array() )
{
parent::__construct( $options );
}
/**
* Set colors and border fro this element
*
* @param ezcGraphPalette $palette Palette
* @return void
*/
public function setFromPalette( ezcGraphPalette $palette )
{
$this->border = $palette->axisColor;
$this->padding = $palette->padding;
$this->margin = $palette->margin;
}
/**
* __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 'nullPosition':
$this->nullPosition = (float) $propertyValue;
break;
case 'axisSpace':
$this->axisSpace = min( 1, max( 0, (float) $propertyValue ) );
break;
case 'labelPadding':
$this->labelPadding = min( 0, max( 0, (float) $propertyValue ) );
break;
case 'raster':
if ( $propertyValue instanceof ezcGraphColor )
{
$this->raster = $propertyValue;
}
else
{
throw new ezcBaseValueException( $propertyValue, 'ezcGraphColor' );
}
case 'rasterMinor':
if ( $propertyValue instanceof ezcGraphColor )
{
$this->rasterMinor = $propertyValue;
}
else
{
throw new ezcBaseValueException( $propertyValue, 'ezcGraphColor' );
}
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;
}
}
/**
* Get coordinate for a dedicated value on the chart
*
* @param ezcGraphBounding $boundings
* @param float $value Value to determine position for
* @return float Position on chart
*/
abstract public function getCoordinate( ezcGraphBoundings $boundings, $value );
/**
* Return count of minor steps
*
* @return integer Count of minor steps
*/
abstract protected function getMinorStepCount();
/**
* Return count of major steps
*
* @return integer Count of major steps
*/
abstract protected function getMajorStepCount();
/**
* Get label for a dedicated step on the axis
*
* @param integer $step Number of step
* @return string label
*/
abstract protected function getLabel( $step );
/**
* Draw labels for an axis
*
* @param ezcGraphRenderer $renderer
* @param ezcGraphCoordinate $start
* @param ezcGraphCoordinate $end
* @param ezcGraphBoundings $boundings
* @return void
*/
protected function drawLabels( ezcGraphRenderer $renderer, ezcGraphCoordinate $start, ezcGraphCoordinate $end, ezcGraphBoundings $boundings )
{
// Draw major steps
$steps = $this->getMajorStepCount();
// Calculate stepsize
$xStepsize = ( $end->x - $start->x ) / $steps;
$yStepsize = ( $end->y - $start->y ) / $steps;
// Caluclate datafree chart border
$xBorder = abs ( ( $boundings->x1 - $boundings->x0 ) * ( $this->axisSpace / 2 ) );
$yBorder = abs ( ( $boundings->y1 - $boundings->y0 ) * ( $this->axisSpace / 2 ) );
for ( $i = 0; $i <= $steps; ++$i )
{
// Draw label
if ( $i < $steps )
{
$label = $this->getLabel( $i );
switch ( $this->position )
{
case ezcGraph::LEFT:
$renderer->drawTextBox(
new ezcGraphCoordinate(
(int) round( $start->x + $i * $xStepsize + $this->labelPadding ),
(int) round( $start->y + $i * $yStepsize + $this->labelPadding )
),
$label,
(int) round( $xStepsize ) - $this->labelPadding,
$yBorder - $this->labelPadding,
ezcGraph::LEFT | ezcGraph::TOP
);
break;
case ezcGraph::RIGHT:
$renderer->drawTextBox(
new ezcGraphCoordinate(
(int) round( $start->x + $i * $xStepsize + $xStepsize ),
(int) round( $start->y + $i * $yStepsize + $this->labelPadding )
),
$label,
(int) round( -$xStepsize ) - $this->labelPadding,
$yBorder - $this->labelPadding,
ezcGraph::RIGHT | ezcGraph::TOP
);
break;
case ezcGraph::BOTTOM:
$renderer->drawTextBox(
new ezcGraphCoordinate(
(int) round( $start->x + $i * $xStepsize - $xBorder ),
(int) round( $start->y + $i * $yStepsize + $yStepsize )
),
$label,
$xBorder - $this->labelPadding,
(int) round( -$yStepsize ) - $this->labelPadding,
ezcGraph::RIGHT | ezcGraph::BOTTOM
);
break;
case ezcGraph::TOP:
$renderer->drawTextBox(
new ezcGraphCoordinate(
(int) round( $start->x + $i * $xStepsize - $xBorder ),
(int) round( $start->y + $i * $yStepsize + $this->labelPadding )
),
$label,
$xBorder - $this->labelPadding,
(int) round( $yStepsize ) - $this->labelPadding,
ezcGraph::RIGHT | ezcGraph::TOP
);
break;
}
}
}
}
/**
* Draw a axis from a start point to an end point. They do not need to be
* placed in-plane.
*
* @param ezcGraphRenderer $renderer
* @param ezcGraphCoordinate $start
* @param ezcGraphCoordinate $end
* @param float $major
* @param float $minor
* @return void
*/
protected function drawAxis( ezcGraphRenderer $renderer, ezcGraphCoordinate $start, ezcGraphCoordinate $end, ezcGraphBoundings $boundings )
{
// Determine normalized direction
$direction = new ezcGraphCoordinate(
$start->x - $end->x,
$start->y - $end->y
);
$length = sqrt( pow( $direction->x, 2) + pow( $direction->y, 2 ) );
$direction->x /= $length;
$direction->y /= $length;
// Draw axis
$renderer->drawLine(
$this->border,
$start,
$end,
false
);
// Draw small arrowhead
$size = abs( ceil( ( ( $end->x - $start->x ) + ( $end->y - $start->y ) ) * $this->axisSpace / 4 ) );
$renderer->drawPolygon(
array(
new ezcGraphCoordinate(
(int) round( $end->x ),
(int) round( $end->y )
),
new ezcGraphCoordinate(
(int) round( $end->x
+ $direction->y * $size / 2
+ $direction->x * $size ),
(int) round( $end->y
+ $direction->x * $size / 2
+ $direction->y * $size )
),
new ezcGraphCoordinate(
(int) round( $end->x
- $direction->y * $size / 2
+ $direction->x * $size ),
(int) round( $end->y
- $direction->x * $size / 2
+ $direction->y * $size )
),
),
$this->border,
true
);
// Apply axisSpace to start and end
$start->x += ( $end->x - $start->x ) * ( $this->axisSpace / 2 );
$start->y += ( $end->y - $start->y ) * ( $this->axisSpace / 2 );
$end->x -= ( $end->x - $start->x ) * ( $this->axisSpace / 2 );
$end->y -= ( $end->y - $start->y ) * ( $this->axisSpace / 2 );
// Draw major steps
$steps = $this->getMajorStepCount();
// Calculate stepsize
$xStepsize = ( $end->x - $start->x ) / $steps;
$yStepsize = ( $end->y - $start->y ) / $steps;
for ( $i = 0; $i <= $steps; ++$i )
{
$renderer->drawLine(
$this->border,
new ezcGraphCoordinate(
(int) round( $start->x + $i * $xStepsize
+ $direction->y * $this->majorScalingLineLength ),
(int) round( $start->y + $i * $yStepsize
+ $direction->x * -$this->majorScalingLineLength )
),
new ezcGraphCoordinate(
(int) round( $start->x + $i * $xStepsize
+ $direction->y * -$this->majorScalingLineLength ),
(int) round( $start->y + $i * $yStepsize
+ $direction->x * $this->majorScalingLineLength )
),
false
);
}
// Draw minor steps if wanted
if ( $this->minorStep )
{
$steps = $this->getMinorStepCount();
for ( $i = 0; $i < $steps; ++$i )
{
$renderer->drawLine(
$this->border,
new ezcGraphCoordinate(
(int) round($start->x + $i * ( $end->x - $start->x ) / $steps
+ $direction->y * $this->minorScalingLineLength),
(int) round($start->y + $i * ( $end->y - $start->y ) / $steps
+ $direction->x * -$this->minorScalingLineLength)
),
new ezcGraphCoordinate(
(int) round($start->x + $i * ( $end->x - $start->x ) / $steps
+ $direction->y * -$this->minorScalingLineLength),
(int) round($start->y + $i * ( $end->y - $start->y ) / $steps
+ $direction->x * $this->minorScalingLineLength)
),
false
);
}
}
$this->drawLabels( $renderer, $start, $end, $boundings );
}
/**
* Render an axe
*
* @param ezcGraphRenderer $renderer
* @access public
* @return void
*/
public function render( ezcGraphRenderer $renderer, ezcGraphBoundings $boundings )
{
switch ( $this->position )
{
case ezcGraph::TOP:
$this->drawAxis(
$renderer,
new ezcGraphCoordinate(
$this->nullPosition,
$boundings->y0
),
new ezcGraphCoordinate(
$this->nullPosition,
$boundings->y1
),
$boundings
);
break;
case ezcGraph::BOTTOM:
$this->drawAxis(
$renderer,
new ezcGraphCoordinate(
$this->nullPosition,
$boundings->y1
),
new ezcGraphCoordinate(
$this->nullPosition,
$boundings->y0
),
$boundings
);
break;
case ezcGraph::LEFT:
$this->drawAxis(
$renderer,
new ezcGraphCoordinate(
$boundings->x0,
$this->nullPosition
),
new ezcGraphCoordinate(
$boundings->x1,
$this->nullPosition
),
$boundings
);
break;
case ezcGraph::RIGHT:
$this->drawAxis(
$renderer,
new ezcGraphCoordinate(
$boundings->x1,
$this->nullPosition
),
new ezcGraphCoordinate(
$boundings->x0,
$this->nullPosition
),
$boundings
);
break;
}
return $boundings;
}
}
?>
|