Chart Axis Display Units and Logarithmic Scale

samples/Chart/33_Chart_create_line_dateaxis.php

@@ -335,7 +335,7 @@
 $spreadsheet->setActiveSheetIndex(1);
 
 // Save Excel 2007 file
-$helper->write($spreadsheet, __FILE__, ['Xlsx'], true);
+$helper->write($spreadsheet, __FILE__, ['Xlsx'], true, resetActiveSheet: false);
 $spreadsheet->disconnectWorksheets();
 
 function dateRange(int $nrows, Spreadsheet $wrkbk): array

samples/Chart/33_Chart_create_scatter5_trendlines.php

@@ -270,4 +270,4 @@
 $spreadsheet->setActiveSheetIndex(1);
 
 // Save Excel 2007 file
-$helper->write($spreadsheet, __FILE__, ['Xlsx'], true);
+$helper->write($spreadsheet, __FILE__, ['Xlsx'], true, resetActiveSheet: false);

samples/Chart/33_Chart_create_scatter6_value_xaxis.php

@@ -131,4 +131,4 @@
 $spreadsheet->setActiveSheetIndex(1);
 
 // Save Excel 2007 file
-$helper->write($spreadsheet, __FILE__, ['Xlsx'], true);
+$helper->write($spreadsheet, __FILE__, ['Xlsx'], true, resetActiveSheet: false);

src/PhpSpreadsheet/Chart/Axis.php

@@ -49,6 +49,8 @@ public function __construct()
 
     private ?AxisText $axisText = null;
 
+    private ?Title $dispUnitsTitle = null;
+
     /**
      * Axis Options.
      *
@@ -70,6 +72,28 @@ public function __construct()
         'majorTimeUnit' => self::TIME_UNIT_YEARS,
         'minorTimeUnit' => self::TIME_UNIT_MONTHS,
         'baseTimeUnit' => self::TIME_UNIT_DAYS,
+        'logBase' => null,
+        'dispUnitsBuiltIn' => null,
+    ];
+    public const DISP_UNITS_HUNDREDS = 'hundreds';
+    public const DISP_UNITS_THOUSANDS = 'thousands';
+    public const DISP_UNITS_TEN_THOUSANDS = 'tenThousands';
+    public const DISP_UNITS_HUNDRED_THOUSANDS = 'hundredThousands';
+    public const DISP_UNITS_MILLIONS = 'millions';
+    public const DISP_UNITS_TEN_MILLIONS = 'tenMillions';
+    public const DISP_UNITS_HUNDRED_MILLIONS = 'hundredMillions';
+    public const DISP_UNITS_BILLIONS = 'billions';
+    public const DISP_UNITS_TRILLIONS = 'trillions';
+    public const DISP_UNITS_BUILTIN_INT = [
+        100 => self::DISP_UNITS_HUNDREDS,
+        1000 => self::DISP_UNITS_THOUSANDS,
+        10000 => self::DISP_UNITS_TEN_THOUSANDS,
+        100000 => self::DISP_UNITS_HUNDRED_THOUSANDS,
+        1000000 => self::DISP_UNITS_MILLIONS,
+        10000000 => self::DISP_UNITS_TEN_MILLIONS,
+        100000000 => self::DISP_UNITS_HUNDRED_MILLIONS,
+        1000000000 => self::DISP_UNITS_BILLIONS,
+        1000000000000 => self::DISP_UNITS_TRILLIONS,
     ];
 
     /**
@@ -149,7 +173,9 @@ public function setAxisOptionsProperties(
         ?string $hidden = null,
         ?string $baseTimeUnit = null,
         ?string $majorTimeUnit = null,
-        ?string $minorTimeUnit = null
+        ?string $minorTimeUnit = null,
+        null|float|int|string $logBase = null,
+        ?string $dispUnitsBuiltIn = null
     ): void {
         $this->axisOptions['axis_labels'] = $axisLabels;
         $this->setAxisOption('horizontal_crosses_value', $horizontalCrossesValue);
@@ -166,6 +192,8 @@ public function setAxisOptionsProperties(
         $this->setAxisOption('baseTimeUnit', $baseTimeUnit);
         $this->setAxisOption('majorTimeUnit', $majorTimeUnit);
         $this->setAxisOption('minorTimeUnit', $minorTimeUnit);
+        $this->setAxisOption('logBase', $logBase);
+        $this->setAxisOption('dispUnitsBuiltIn', $dispUnitsBuiltIn);
     }
 
     /**
@@ -317,6 +345,18 @@ public function getNoFill(): bool
         return $this->noFill;
     }
 
+    public function setDispUnitsTitle(?Title $dispUnitsTitle): self
+    {
+        $this->dispUnitsTitle = $dispUnitsTitle;
+
+        return $this;
+    }
+
+    public function getDispUnitsTitle(): ?Title
+    {
+        return $this->dispUnitsTitle;
+    }
+
     /**
      * Implement PHP __clone to create a deep clone, not just a shallow copy.
      */
@@ -326,6 +366,7 @@ public function __clone()
         $this->majorGridlines = ($this->majorGridlines === null) ? null : clone $this->majorGridlines;
         $this->majorGridlines = ($this->minorGridlines === null) ? null : clone $this->minorGridlines;
         $this->axisText = ($this->axisText === null) ? null : clone $this->axisText;
+        $this->dispUnitsTitle = ($this->dispUnitsTitle === null) ? null : clone $this->dispUnitsTitle;
         $this->fillColor = clone $this->fillColor;
     }
 }

src/PhpSpreadsheet/Chart/Title.php

@@ -16,7 +16,7 @@ class Title
     /**
      * Title Caption.
      *
-     * @var array|RichText|string
+     * @var null|array|RichText|string may be null
      */
     private $caption = '';
 
@@ -39,7 +39,7 @@ class Title
     /**
      * Create a new Title.
      *
-     * @param array|RichText|string $caption
+     * @param null|array|RichText|string $caption may be null
      * @param bool $overlay
      */
     public function __construct($caption = '', ?Layout $layout = null, $overlay = false)
@@ -52,7 +52,7 @@ public function __construct($caption = '', ?Layout $layout = null, $overlay = fa
     /**
      * Get caption.
      *
-     * @return array|RichText|string
+     * @return null|array|RichText|string may be null
      */
     public function getCaption()
     {
@@ -68,6 +68,9 @@ public function getCaptionText(?Spreadsheet $spreadsheet = null): string
             }
         }
         $caption = $this->caption;
+        if ($caption === null) {
+            return '';
+        }
         if (is_string($caption)) {
             return $caption;
         }
@@ -91,7 +94,7 @@ public function getCaptionText(?Spreadsheet $spreadsheet = null): string
     /**
      * Set caption.
      *
-     * @param array|RichText|string $caption
+     * @param null|array|RichText|string $caption may be null
      *
      * @return $this
      */

src/PhpSpreadsheet/Helper/Sample.php

@@ -111,13 +111,14 @@ public function getSamples(): array
     /**
      * Write documents.
      *
-     * @param string $filename
      * @param string[] $writers
      */
-    public function write(Spreadsheet $spreadsheet, $filename, array $writers = ['Xlsx', 'Xls'], bool $withCharts = false, ?callable $writerCallback = null): void
+    public function write(Spreadsheet $spreadsheet, string $filename, array $writers = ['Xlsx', 'Xls'], bool $withCharts = false, ?callable $writerCallback = null, bool $resetActiveSheet = true): void
     {
         // Set active sheet index to the first sheet, so Excel opens this as the first sheet
-        $spreadsheet->setActiveSheetIndex(0);
+        if ($resetActiveSheet) {
+            $spreadsheet->setActiveSheetIndex(0);
+        }
 
         // Write documents
         foreach ($writers as $writerType) {

src/PhpSpreadsheet/Reader/Xlsx/Chart.php

@@ -494,7 +494,7 @@ public function readChart(SimpleXMLElement $chartElements, $chartName): \PhpOffi
 
     private function chartTitle(SimpleXMLElement $titleDetails): Title
     {
-        $caption = [];
+        $caption = null;
         $titleLayout = null;
         $titleOverlay = false;
         $titleFormula = null;
@@ -503,6 +503,7 @@ private function chartTitle(SimpleXMLElement $titleDetails): Title
             $chartDetail = Xlsx::testSimpleXml($chartDetail);
             switch ($titleDetailKey) {
                 case 'tx':
+                    $caption = [];
                     if (isset($chartDetail->rich)) {
                         $titleDetails = $chartDetail->rich->children($this->aNamespace);
                         foreach ($titleDetails as $titleKey => $titleDetail) {
@@ -1518,6 +1519,13 @@ private function setAxisProperties(SimpleXMLElement $chartDetail, ?Axis $whichAx
         if (isset($chartDetail->crossBetween)) {
             $whichAxis->setCrossBetween((string) self::getAttributeString($chartDetail->crossBetween, 'val'));
         }
+        if (isset($chartDetail->dispUnits, $chartDetail->dispUnits->builtInUnit)) {
+            $whichAxis->setAxisOption('dispUnitsBuiltIn', (string) self::getAttributeString($chartDetail->dispUnits->builtInUnit, 'val'));
+            if (isset($chartDetail->dispUnits->dispUnitsLbl)) {
+                $whichAxis->setDispUnitsTitle(new Title());
+                // TODO parse title elements
+            }
+        }
         if (isset($chartDetail->majorTickMark)) {
             $whichAxis->setAxisOption('major_tick_mark', (string) self::getAttributeString($chartDetail->majorTickMark, 'val'));
         }
@@ -1533,6 +1541,9 @@ private function setAxisProperties(SimpleXMLElement $chartDetail, ?Axis $whichAx
         if (isset($chartDetail->crossesAt)) {
             $whichAxis->setAxisOption('horizontal_crosses_value', (string) self::getAttributeString($chartDetail->crossesAt, 'val'));
         }
+        if (isset($chartDetail->scaling->logBase)) {
+            $whichAxis->setAxisOption('logBase', (string) self::getAttributeString($chartDetail->scaling->logBase, 'val'));
+        }
         if (isset($chartDetail->scaling->orientation)) {
             $whichAxis->setAxisOption('orientation', (string) self::getAttributeString($chartDetail->scaling->orientation, 'val'));
         }