Added fillColor for chart plot series

For now it is only to write to Xlsx

Closes #158

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Added
 
+- Support for chart fill color - @CrazyBite [#158](https://github.com/PHPOffice/PhpSpreadsheet/pull/158)
+
 ### Changed
 
 - Merge data-validations to reduce written worksheet size - @billblume [#131](https://github.com/PHPOffice/PhpSpreadSheet/issues/131)

src/PhpSpreadsheet/Chart/DataSeriesValues.php

@@ -81,17 +81,26 @@ class DataSeriesValues
      */
     private $dataValues = [];
 
+    /**
+     * Fill color.
+     *
+     * @var string
+     */
+    private $fillColor;
+
     /**
      * Create a new DataSeriesValues object.
      *
+     *
      * @param mixed $dataType
      * @param string $dataSource
      * @param null|mixed $formatCode
      * @param mixed $pointCount
      * @param mixed $dataValues
      * @param null|mixed $marker
+     * @param null|string $fillColor
      */
-    public function __construct($dataType = self::DATASERIES_TYPE_NUMBER, $dataSource = null, $formatCode = null, $pointCount = 0, $dataValues = [], $marker = null)
+    public function __construct($dataType = self::DATASERIES_TYPE_NUMBER, $dataSource = null, $formatCode = null, $pointCount = 0, $dataValues = [], $marker = null, $fillColor = null)
     {
         $this->setDataType($dataType);
         $this->dataSource = $dataSource;
@@ -99,6 +108,7 @@ class DataSeriesValues
         $this->pointCount = $pointCount;
         $this->dataValues = $dataValues;
         $this->pointMarker = $marker;
+        $this->fillColor = $fillColor;
     }
 
     /**
@@ -217,6 +227,33 @@ class DataSeriesValues
         return $this->pointCount;
     }
 
+    /**
+     * Get fill color.
+     *
+     * @return string HEX color
+     */
+    public function getFillColor()
+    {
+        return $this->fillColor;
+    }
+
+    /**
+     * Set fill color for series.
+     *
+     * @param string $color HEX color
+     *
+     * @return   DataSeriesValues
+     */
+    public function setFillColor($color)
+    {
+        if (!preg_match('/^[a-f0-9]{6}$/i', $color)) {
+            throw new Exception('Invalid hex color for chart series');
+        }
+        $this->fillColor = $color;
+
+        return $this;
+    }
+
     /**
      * Identify if the Data Series is a multi-level or a simple series.
      *

src/PhpSpreadsheet/Writer/Xlsx/Chart.php

@@ -1098,6 +1098,20 @@ class Chart extends WriterPart
         foreach ($plotSeriesOrder as $plotSeriesIdx => $plotSeriesRef) {
             $objWriter->startElement('c:ser');
 
+            $plotLabel = $plotGroup->getPlotLabelByIndex($plotSeriesIdx);
+            if ($plotLabel) {
+                $fillColor = $plotLabel->getFillColor();
+                if ($fillColor !== null) {
+                    $objWriter->startElement('c:spPr');
+                    $objWriter->startElement('a:solidFill');
+                    $objWriter->startElement('a:srgbClr');
+                    $objWriter->writeAttribute('val', $fillColor);
+                    $objWriter->endElement();
+                    $objWriter->endElement();
+                    $objWriter->endElement();
+                }
+            }
+
             $objWriter->startElement('c:idx');
             $objWriter->writeAttribute('val', $this->_seriesIndex + $plotSeriesIdx);
             $objWriter->endElement();