1 files changed, 162 insertions, 0 deletions
diff --git a/library/Icinga/Chart/Chart.php b/library/Icinga/Chart/Chart.php
new file mode 100644
index 0000000..eaf69d1
--- /dev/null
+++ b/library/Icinga/Chart/Chart.php
@@ -0,0 +1,162 @@
+<?php
+/* Icinga Web 2 | (c) 2013 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Chart;
+
+use Imagick;
+use Icinga\Chart\Legend;
+use Icinga\Chart\Palette;
+use Icinga\Chart\Primitive\Drawable;
+use Icinga\Chart\SVGRenderer;
+use Icinga\Exception\IcingaException;
+
+/**
+ * Base class for charts, extended by all other Chart classes.
+ */
+abstract class Chart implements Drawable
+{
+    protected $align = false;
+
+    /**
+     * SVG renderer that handles
+     *
+     * @var SVGRenderer
+     */
+    protected $renderer;
+
+    /**
+     * Legend to use for this chart
+     *
+     * @var Legend
+     */
+    protected $legend;
+
+    /**
+     * The style-palette for this chart
+     *
+     * @var Palette
+     */
+    protected $palette;
+
+    /**
+     * The title of this chart, used for providing accessibility features
+     *
+     * @var string
+     */
+    public $title;
+
+    /**
+     * The description for this chart, mandatory for providing accessibility features
+     *
+     * @var string
+     */
+    public $description;
+
+    /**
+     * Create a new chart object and create internal objects
+     *
+     * If you want to extend this class use the init() method as an extension point,
+     * as this will be called at the end of the construct call
+     */
+    public function __construct()
+    {
+        $this->legend = new Legend();
+        $this->palette = new Palette();
+        $this->init();
+    }
+
+    /**
+     * Extension point for subclasses, called on __construct
+     */
+    protected function init()
+    {
+    }
+
+    /**
+     * Extension point for implementing rendering logic
+     *
+     * This method is called after data validation, but before toSvg is called
+     */
+    protected function build()
+    {
+    }
+
+    /**
+     * Check if the current dataset has the proper structure for this chart.
+     *
+     * Needs to be overwritten by extending classes. The default implementation returns false.
+     *
+     * @return bool True when the dataset is valid, otherwise false
+     */
+    abstract public function isValidDataFormat();
+
+
+    /**
+     * Disable the legend for this chart
+     */
+    public function disableLegend()
+    {
+        $this->legend = null;
+    }
+
+    /**
+     * Render this graph and return the created SVG
+     *
+     * @return  string              The SVG created by the SvgRenderer
+     *
+     * @throws  IcingaException     Thrown wen the dataset is not valid for this graph
+     * @see     SVGRenderer::render
+     */
+    public function render()
+    {
+        if (!$this->isValidDataFormat()) {
+            throw new IcingaException('Dataset for graph doesn\'t have the proper structure');
+        }
+        $this->build();
+        if ($this->align) {
+            $this->renderer->preserveAspectRatio();
+            $this->renderer->setXAspectRatioAlignment(SVGRenderer::X_ASPECT_RATIO_MIN);
+            $this->renderer->setYAspectRatioAlignment(SVGRenderer::Y_ASPECT_RATIO_MIN);
+        }
+
+        $this->renderer->setAriaDescription($this->description);
+        $this->renderer->setAriaTitle($this->title);
+        $this->renderer->getCanvas()->setAriaRole('presentation');
+
+        $this->renderer->getCanvas()->addElement($this);
+        return $this->renderer->render();
+    }
+
+    /**
+     * Return this graph rendered as PNG
+     *
+     * @param   int     $width      The width of the PNG in pixel
+     * @param   int     $height     The height of the PNG in pixel
+     *
+     * @return  string              A PNG binary string
+     *
+     * @throws  IcingaException     In case ImageMagick is not available
+     */
+    public function toPng($width, $height)
+    {
+        if (! class_exists('Imagick')) {
+            throw new IcingaException('Cannot render PNGs without ImageMagick');
+        }
+
+        $image = new Imagick();
+        $image->readImageBlob($this->render());
+        $image->setImageFormat('png24');
+        $image->resizeImage($width, $height, imagick::FILTER_LANCZOS, 1);
+        return $image;
+    }
+
+    /**
+     * Align the chart to the top left corner instead of centering it
+     *
+     * @param bool $align
+     */
+    public function alignTopLeft($align = true)
+    {
+        $this->align = $align;
+    }
+}