103 lines
2.7 KiB
PHP
103 lines
2.7 KiB
PHP
<?php
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/* Icinga Web 2 | (c) 2013-2015 Icinga Development Team | GPLv2+ */
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namespace Icinga\Chart;
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use DOMElement;
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use Icinga\Chart\Palette;
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use Icinga\Chart\Primitive\Canvas;
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use Icinga\Chart\Primitive\Drawable;
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use Icinga\Chart\Primitive\Rect;
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use Icinga\Chart\Primitive\Text;
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use Icinga\Chart\Render\LayoutBox;
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use Icinga\Chart\Render\RenderContext;
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/**
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* Drawable for creating a Graph Legend on the bottom of a graph.
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*
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* Usually used by the GridChart class internally.
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*/
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class Legend implements Drawable
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{
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/**
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* Internal counter for unnamed label identifiers
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*
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* @var int
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*/
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private $internalCtr = 0;
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/**
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*
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* Content of this legend
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*
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* @var array
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*/
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private $dataset = array();
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/**
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* Set the content to be displayed by this legend
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*
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* @param array $dataset An array of datasets in the form they are provided to the graphing implementation
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*/
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public function addDataset(array $dataset)
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{
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if (!isset($dataset['label'])) {
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$dataset['label'] = 'Dataset ' . (++$this->internalCtr);
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}
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if (!isset($dataset['color'])) {
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return;
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}
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$this->dataset[$dataset['color']] = $dataset['label'];
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}
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/**
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* Render the legend to an SVG object
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*
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* @param RenderContext $ctx The context to use for rendering this legend
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*
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* @return DOMElement The SVG representation of this legend
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*/
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public function toSvg(RenderContext $ctx)
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{
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$outer = new Canvas('legend', new LayoutBox(0, 0, 100, 100));
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$outer->getLayout()->setPadding(2, 2, 2, 2);
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$nrOfColumns = 4;
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$topstep = 10 / $nrOfColumns + 2;
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$top = 0;
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$left = 0;
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$lastLabelEndPos = -1;
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foreach ($this->dataset as $color => $text) {
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$leftstep = 100 / $nrOfColumns + strlen($text);
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// Make sure labels don't overlap each other
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while ($lastLabelEndPos >= $left) {
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$left += $leftstep;
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}
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// When a label is longer than the available space, use the next line
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if ($left + strlen($text) > 100) {
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$top += $topstep;
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$left = 0;
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}
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$colorBox = new Rect($left, $top, 2, 2);
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$colorBox->setFill($color)->setStrokeWidth(2);
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$colorBox->keepRatio();
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$outer->addElement($colorBox);
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$textBox = new Text($left+5, $top+2, $text);
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$textBox->setFontSize('2em');
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$outer->addElement($textBox);
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// readjust layout
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$lastLabelEndPos = $left + strlen($text);
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$left += $leftstep;
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}
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$svg = $outer->toSvg($ctx);
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return $svg;
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}
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}
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