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<?php
/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
namespace Icinga\Chart\Primitive;
use DOMElement;
use Icinga\Chart\Render\LayoutBox;
use Icinga\Chart\Render\RenderContext;
/**
* Canvas SVG component that encapsulates grouping and padding and allows rendering
* multiple elements in a group
*
*/
class Canvas implements Drawable
{
/**
* The name of the canvas, will be used as the id
*
* @var string
*/
private $name;
/**
* An array of child elements of this Canvas
*
* @var array
*/
private $children = array();
/**
* When true, this canvas is encapsulated in a clipPath tag and not drawn
*
* @var bool
*/
private $isClipPath = false;
/**
* The LayoutBox of this Canvas
*
* @var LayoutBox
*/
private $rect;
/**
* The aria role used to describe this canvas' purpose in the accessibility tree
*
* @var string
*/
private $ariaRole;
/**
* Create this canvas
*
* @param String $name The name of this canvas
* @param LayoutBox $rect The layout and size of this canvas
*/
public function __construct($name, LayoutBox $rect)
{
$this->rect = $rect;
$this->name = $name;
}
/**
* Convert this canvas to a clipPath element
*/
public function toClipPath()
{
$this->isClipPath = true;
}
/**
* Return the layout of this canvas
*
* @return LayoutBox
*/
public function getLayout()
{
return $this->rect;
}
/**
* Add an element to this canvas
*
* @param Drawable $child
*/
public function addElement(Drawable $child)
{
$this->children[] = $child;
}
/**
* Create the SVG representation from this Drawable
*
* @param RenderContext $ctx The context to use for rendering
* @return DOMElement The SVG Element
*/
public function toSvg(RenderContext $ctx)
{
$doc = $ctx->getDocument();
if ($this->isClipPath) {
$outer = $doc->createElement('defs');
$innerContainer = $element = $doc->createElement('clipPath');
$outer->appendChild($element);
} else {
$outer = $element = $doc->createElement('g');
$innerContainer = $doc->createElement('g');
$innerContainer->setAttribute('x', 0);
$innerContainer->setAttribute('y', 0);
$innerContainer->setAttribute('id', $this->name . '_inner');
$innerContainer->setAttribute('transform', $this->rect->getInnerTransform($ctx));
$element->appendChild($innerContainer);
}
$element->setAttribute('id', $this->name);
foreach ($this->children as $child) {
$innerContainer->appendChild($child->toSvg($ctx));
}
if (isset($this->ariaRole)) {
$outer->setAttribute('role', $this->ariaRole);
}
return $outer;
}
/**
* Set the aria role used to determine the meaning of this canvas in the accessibility tree
*
* The role 'presentation' will indicate that the purpose of this canvas is entirely decorative, while the role
* 'img' will indicate that the canvas contains an image, with a possible title or a description. For other
* possible roles, see http://www.w3.org/TR/wai-aria/roles
*
* @param $role string The aria role to set
*/
public function setAriaRole($role)
{
$this->ariaRole = $role;
}
}
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