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-rw-r--r--library/Icinga/Chart/Legend.php102
1 files changed, 102 insertions, 0 deletions
diff --git a/library/Icinga/Chart/Legend.php b/library/Icinga/Chart/Legend.php
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+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+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;
+
+ $topstep = 10 / $nrOfColumns + 2;
+
+ $top = 0;
+ $left = 0;
+ $lastLabelEndPos = -1;
+ foreach ($this->dataset as $color => $text) {
+ $leftstep = 100 / $nrOfColumns + strlen($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;
+ }
+}