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<?php
/**
* File containing the abstract ezcGraphAxisExactLabelRenderer 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
*/
/**
* Renders axis labels like known from charts drawn in analysis
*
* @package Graph
*/
class ezcGraphAxisCenteredLabelRenderer extends ezcGraphAxisLabelRenderer
{
/**
* Show the value at the zero point of an axis. This value might be
* crossed by the other axis which would result in an unreadable label.
*
* @var boolean
*/
protected $showZeroValue = false;
public function __set( $propertyName, $propertyValue )
{
switch ( $propertyName )
{
case 'showZeroValue':
$this->showZeroValue = (bool) $propertyValue;
break;
default:
return parent::__set( $propertyName, $propertyValue );
}
}
/**
* Render Axis labels
*
* Render labels for an axis.
*
* @param ezcGraphRenderer $renderer Renderer used to draw the chart
* @param ezcGraphBoundings $boundings Boundings of the axis
* @param ezcGraphCoordinate $start Axis starting point
* @param ezcGraphCoordinate $end Axis ending point
* @param ezcGraphChartElementAxis $axis Axis instance
* @return void
*/
public function renderLabels(
ezcGraphRenderer $renderer,
ezcGraphBoundings $boundings,
ezcGraphCoordinate $start,
ezcGraphCoordinate $end,
ezcGraphChartElementAxis $axis )
{
// receive rendering parameters from axis
$this->majorStepCount = $axis->getMajorStepCount();
$this->minorStepCount = $axis->getMinorStepCount();
// Determine normalized axis 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;
// Calculate stepsizes for mjor and minor steps
$majorStep = new ezcGraphCoordinate(
( $end->x - $start->x ) / $this->majorStepCount,
( $end->y - $start->y ) / $this->majorStepCount
);
if ( $this->minorStepCount )
{
$minorStep = new ezcGraphCoordinate(
( $end->x - $start->x ) / $this->minorStepCount,
( $end->y - $start->y ) / $this->minorStepCount
);
}
if ( $this->outerGrid )
{
$gridBoundings = $boundings;
}
else
{
$gridBoundings = new ezcGraphBoundings(
$boundings->x0 + ( $boundings->x1 - $boundings->x0 ) * $axis->axisSpace,
$boundings->y0 + ( $boundings->y1 - $boundings->y0 ) * $axis->axisSpace,
$boundings->x1 - ( $boundings->x1 - $boundings->x0 ) * $axis->axisSpace,
$boundings->y1 - ( $boundings->y1 - $boundings->y0 ) * $axis->axisSpace
);
}
// Determine size of labels
switch ( $axis->position )
{
case ezcGraph::RIGHT:
case ezcGraph::LEFT:
$labelWidth = min(
abs( $majorStep->x ),
( $boundings->x1 - $boundings->x0 ) * $axis->axisSpace * 2
);
$labelHeight = ( $boundings->y1 - $boundings->y0 ) * $axis->axisSpace;
break;
case ezcGraph::BOTTOM:
case ezcGraph::TOP:
$labelWidth = ( $boundings->x1 - $boundings->x0 ) * $axis->axisSpace;
$labelHeight = min(
abs( $majorStep->y ),
( $boundings->y1 - $boundings->y0 ) * $axis->axisSpace * 2
);
break;
}
// Draw steps and grid
$step = 0;
while ( $step <= $this->majorStepCount )
{
if ( ! $axis->isZeroStep( $step ) )
{
// major grid
if ( $axis->majorGrid )
{
$this->drawGrid( $renderer, $gridBoundings, $start, $majorStep, $axis->majorGrid );
}
// major step
$this->drawStep( $renderer, $start, $direction, $axis->position, $this->majorStepSize, $axis->border );
}
// draw label
if ( $this->showZeroValue || ! $axis->isZeroStep( $step ) )
{
$label = $axis->getLabel( $step );
switch ( $axis->position )
{
case ezcGraph::TOP:
case ezcGraph::BOTTOM:
$renderer->drawText(
new ezcGraphBoundings(
$start->x - $labelWidth + $this->labelPadding,
$start->y - $labelHeight / 2 + $this->labelPadding,
$start->x - $this->labelPadding,
$start->y + $labelHeight / 2 - $this->labelPadding
),
$label,
ezcGraph::MIDDLE | ezcGraph::RIGHT
);
break;
case ezcGraph::LEFT:
case ezcGraph::RIGHT:
$renderer->drawText(
new ezcGraphBoundings(
$start->x - $labelWidth / 2 + $this->labelPadding,
$start->y + $this->labelPadding,
$start->x + $labelWidth / 2 - $this->labelPadding,
$start->y + $labelHeight - $this->labelPadding
),
$label,
ezcGraph::CENTER | ezcGraph::TOP
);
break;
}
}
// second iteration for minor steps, if wanted
if ( $this->minorStepCount )
{
$minorGridPosition = new ezcGraphCoordinate(
$start->x + $minorStep->x,
$start->y + $minorStep->y
);
while ( $minorGridPosition->x < ( $start->x + $majorStep->x ) )
{
// minor grid
if ( $axis->minorGrid )
{
$this->drawGrid( $renderer, $gridBoundings, $minorGridPosition, $majorStep, $axis->minorGrid );
}
$minorGridPosition->x += $minorStep->x;
$minorGridPosition->y += $minorStep->y;
// minor step
$this->drawStep( $renderer, $minorGridPosition, $direction, $axis->position, $this->minorStepSize, $axis->border );
}
}
$start->x += $majorStep->x;
$start->y += $majorStep->y;
++$step;
}
}
}
?>
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