103 lines
2.7 KiB
PHP
103 lines
2.7 KiB
PHP
<?php
|
|
// {{{ICINGA_LICENSE_HEADER}}}
|
|
// {{{ICINGA_LICENSE_HEADER}}}
|
|
|
|
namespace Icinga\Chart;
|
|
|
|
use DOMElement;
|
|
use Icinga\Chart\Palette;
|
|
use Icinga\Chart\Primitive\Canvas;
|
|
use Icinga\Chart\Primitive\Drawable;
|
|
use Icinga\Chart\Primitive\Rect;
|
|
use Icinga\Chart\Primitive\Text;
|
|
use Icinga\Chart\Render\LayoutBox;
|
|
use Icinga\Chart\Render\RenderContext;
|
|
|
|
/**
|
|
* Drawable for creating a Graph Legend on the bottom of a graph.
|
|
*
|
|
* Usually used by the GridChart class internally.
|
|
*/
|
|
class Legend implements Drawable
|
|
{
|
|
|
|
/**
|
|
* Internal counter for unnamed label identifiers
|
|
*
|
|
* @var int
|
|
*/
|
|
private $internalCtr = 0;
|
|
|
|
/**
|
|
*
|
|
* Content of this legend
|
|
*
|
|
* @var array
|
|
*/
|
|
private $dataset = array();
|
|
|
|
|
|
/**
|
|
* Set the content to be displayed by this legend
|
|
*
|
|
* @param array $dataset An array of datasets in the form they are provided to the graphing implementation
|
|
*/
|
|
public function addDataset(array $dataset)
|
|
{
|
|
if (!isset($dataset['label'])) {
|
|
$dataset['label'] = 'Dataset ' . (++$this->internalCtr);
|
|
}
|
|
if (!isset($dataset['color'])) {
|
|
return;
|
|
}
|
|
$this->dataset[$dataset['color']] = $dataset['label'];
|
|
}
|
|
|
|
/**
|
|
* Render the legend to an SVG object
|
|
*
|
|
* @param RenderContext $ctx The context to use for rendering this legend
|
|
*
|
|
* @return DOMElement The SVG representation of this legend
|
|
*/
|
|
public function toSvg(RenderContext $ctx)
|
|
{
|
|
$outer = new Canvas('legend', new LayoutBox(0, 0, 100, 100));
|
|
$outer->getLayout()->setPadding(2, 2, 2, 2);
|
|
$nrOfColumns = 4;
|
|
|
|
$leftstep = 100 / $nrOfColumns;
|
|
$topstep = 10 / $nrOfColumns + 2;
|
|
|
|
$top = 0;
|
|
$left = 0;
|
|
$lastLabelEndPos = -1;
|
|
foreach ($this->dataset as $color => $text) {
|
|
// Make sure labels don't overlap each other
|
|
while ($lastLabelEndPos >= $left) {
|
|
$left += $leftstep;
|
|
}
|
|
// When a label is longer than the available space, use the next line
|
|
if ($left + strlen($text) > 100) {
|
|
$top += $topstep;
|
|
$left = 0;
|
|
}
|
|
|
|
$colorBox = new Rect($left, $top, 2, 2);
|
|
$colorBox->setFill($color)->setStrokeWidth(2);
|
|
$colorBox->keepRatio();
|
|
$outer->addElement($colorBox);
|
|
|
|
$textBox = new Text($left+5, $top+2, $text);
|
|
$textBox->setFontSize('2em');
|
|
$outer->addElement($textBox);
|
|
|
|
// readjust layout
|
|
$lastLabelEndPos = $left + strlen($text);
|
|
$left += $leftstep;
|
|
}
|
|
$svg = $outer->toSvg($ctx);
|
|
return $svg;
|
|
}
|
|
}
|