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msd2/tracking/piwik/plugins/ImageGraph/StaticGraph/PieGraph.php

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+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+
+namespace Piwik\Plugins\ImageGraph\StaticGraph;
+
+use CpChart\Chart\Pie;
+use Piwik\Plugins\ImageGraph\StaticGraph;
+
+/**
+ *
+ */
+abstract class PieGraph extends StaticGraph
+{
+    const RADIUS_MARGIN = 40;
+    const PIE_RIGHT_MARGIN = 20;
+    const SECTOR_GAP = 2.5;
+
+    const SLICE_COLOR_KEY = "SLICE_COLOR";
+
+    /**
+     * @var Pie
+     */
+    protected $pieChart;
+    protected $xPosition;
+    protected $yPosition;
+    protected $pieConfig;
+
+    protected function getDefaultColors()
+    {
+        return array(
+            self::SLICE_COLOR_KEY . '1' => '3C5A69',
+            self::SLICE_COLOR_KEY . '2' => '679BB5',
+            self::SLICE_COLOR_KEY . '3' => '695A3C',
+            self::SLICE_COLOR_KEY . '4' => 'B58E67',
+            self::SLICE_COLOR_KEY . '5' => '8AA68A',
+            self::SLICE_COLOR_KEY . '6' => 'A4D2A6',
+        );
+    }
+
+    protected function initPieGraph($showLegend)
+    {
+        $this->truncateSmallValues();
+        $this->initpData();
+        $this->initpImage();
+
+        if ($this->height > $this->width) {
+            $radius = ($this->width / 2) - self::RADIUS_MARGIN;
+        } else {
+            $radius = ($this->height / 2) - self::RADIUS_MARGIN;
+        }
+
+        $this->pieChart = new Pie($this->pImage, $this->pData);
+
+        $numberOfSlices = count($this->abscissaSeries);
+        $numberOfAvailableColors = count($this->colors);
+        for ($i = 0; $i < $numberOfSlices; $i++) {
+            $this->pieChart->setSliceColor($i, $this->colors[self::SLICE_COLOR_KEY . (($i % $numberOfAvailableColors) + 1)]);
+        }
+
+        // max abscissa label width is used to set the pie right margin
+        list($abscissaMaxWidth, $abscissaMaxHeight) = $this->getMaximumTextWidthHeight($this->abscissaSeries);
+
+        $this->xPosition = $this->width - $radius - $abscissaMaxWidth - self::PIE_RIGHT_MARGIN;
+        $this->yPosition = $this->height / 2;
+
+        if ($showLegend) {
+            $this->pieChart->drawPieLegend(15, 40, array("Alpha" => 20));
+        }
+
+        $this->pieConfig =
+            array(
+                'Radius'        => $radius,
+                'DrawLabels'    => true,
+                'DataGapAngle'  => self::SECTOR_GAP,
+                'DataGapRadius' => self::SECTOR_GAP,
+            );
+    }
+
+    /**
+     * this method logic is close to Piwik's core filter_truncate.
+     * it uses a threshold to determine if an abscissa value should be drawn on the PIE
+     * discarded abscissa values are summed in the 'other' abscissa value
+     *
+     * if this process is not perform, CpChart will draw pie slices that are too small to see
+     */
+    private function truncateSmallValues()
+    {
+        $metricColumns = array_keys($this->ordinateSeries);
+        $metricColumn = $metricColumns[0];
+
+        $ordinateValuesSum = 0;
+        foreach ($this->ordinateSeries[$metricColumn] as $ordinateValue) {
+            $ordinateValuesSum += $ordinateValue;
+        }
+
+        $truncatedOrdinateSeries[$metricColumn] = array();
+        $truncatedAbscissaSeries = array();
+        $smallValuesSum = 0;
+
+        $ordinateValuesCount = count($this->ordinateSeries[$metricColumn]);
+        for ($i = 0; $i < $ordinateValuesCount - 1; $i++) {
+            $ordinateValue = $this->ordinateSeries[$metricColumn][$i];
+            if ($ordinateValue / $ordinateValuesSum > 0.01) {
+                $truncatedOrdinateSeries[$metricColumn][] = $ordinateValue;
+                $truncatedAbscissaSeries[] = $this->abscissaSeries[$i];
+            } else {
+                $smallValuesSum += $ordinateValue;
+            }
+        }
+
+        $smallValuesSum += $this->ordinateSeries[$metricColumn][$ordinateValuesCount - 1];
+        if (($smallValuesSum / $ordinateValuesSum) > 0.01) {
+            $truncatedOrdinateSeries[$metricColumn][] = $smallValuesSum;
+            $truncatedAbscissaSeries[] = end($this->abscissaSeries);
+        }
+
+        $this->ordinateSeries = $truncatedOrdinateSeries;
+        $this->abscissaSeries = $truncatedAbscissaSeries;
+    }
+}