Fix/chart axis titles (#1760)

* use axPos value to determine whether an axis title is mapped to the XaxisLabel or YaxisLabel

* update changelog

* Fix php-cs-fixer violations

Co-authored-by: Darren Maczka <dkm@utk.edu>
Co-authored-by: Mark Baker <mark@lange.demon.co.uk>

CHANGELOG.md

@@ -32,6 +32,8 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Fixed
 
+- Fix for Xlsx Chart axis titles mapping to correct X or Y axis label when only one is present.
+- Resolve Google Sheets Xlsx charts issue. Google Sheets uses oneCellAnchor positioning and does not include *Cache values in the exported Xlsx.
 - Fix For Null Exception on ODS Read of Page Settings. [#1772](https://github.com/PHPOffice/PhpSpreadsheet/issues/1772)
 - Fix Xlsx reader overriding manually set number format with builtin number format. [PR #1805](https://github.com/PHPOffice/PhpSpreadsheet/pull/1805)
 - Fix Xlsx reader cell alignment. [PR #1710](https://github.com/PHPOffice/PhpSpreadsheet/pull/1710)
@@ -58,7 +60,6 @@ and this project adheres to [Semantic Versioning](https://semver.org).
 
 ### Fixed
 
-- Resolve Google Sheets Xlsx charts issue. Google Sheets uses oneCellAnchor positioning and does not include *Cache values in the exported Xlsx.
 - Fix for Xls Reader when SST has a bad length [#1592](https://github.com/PHPOffice/PhpSpreadsheet/issues/1592)
 - Resolve Xlsx loader issue whe hyperlinks don't have a destination
 - Resolve issues when printer settings resources IDs clash with drawing IDs

src/PhpSpreadsheet/Reader/Xlsx/Chart.php

@@ -91,7 +91,21 @@ class Chart
                                             break;
                                         case 'valAx':
                                             if (isset($chartDetail->title)) {
-                                                $YaxisLabel = self::chartTitle($chartDetail->title->children($namespacesChartMeta['c']), $namespacesChartMeta);
+                                                $axisLabel = self::chartTitle($chartDetail->title->children($namespacesChartMeta['c']), $namespacesChartMeta);
+                                                $axPos = self::getAttribute($chartDetail->axPos, 'val', 'string');
+
+                                                switch ($axPos) {
+                                                    case 't':
+                                                    case 'b':
+                                                        $XaxisLabel = $axisLabel;
+
+                                                        break;
+                                                    case 'r':
+                                                    case 'l':
+                                                        $YaxisLabel = $axisLabel;
+
+                                                        break;
+                                                }
                                             }
 
                                             break;

tests/PhpSpreadsheetTests/Reader/Xlsx/ChartsTitleTest.php

@@ -0,0 +1,64 @@
+<?php
+
+namespace PhpOffice\PhpSpreadsheetTests\Reader;
+
+use PhpOffice\PhpSpreadsheet\IOFactory;
+use PHPUnit\Framework\TestCase;
+
+function getTitleText($title)
+{
+    if (null === $title || null === $title->getCaption()) {
+        return null;
+    }
+
+    return implode("\n", array_map(function ($rt) {
+        return $rt->getPlainText();
+    }, $title->getCaption()));
+}
+
+class ChartsTitleTest extends TestCase
+{
+    public function testChartTitles(): void
+    {
+        $filename = 'tests/data/Reader/XLSX/excelChartsTest.xlsx';
+        $reader = IOFactory::createReader('Xlsx')->setIncludeCharts(true);
+        $spreadsheet = $reader->load($filename);
+        $worksheet = $spreadsheet->getActiveSheet();
+
+        $charts = $worksheet->getChartCollection();
+        self::assertEquals(5, $worksheet->getChartCount());
+        self::assertCount(5, $charts);
+
+        // No title or axis labels
+        $chart1 = $charts[0];
+        $title = getTitleText($chart1->getTitle());
+        self::assertEmpty($title);
+        self::assertEmpty(getTitleText($chart1->getXAxisLabel()));
+        self::assertEmpty(getTitleText($chart1->getYAxisLabel()));
+
+        // Title, no axis labels
+        $chart2 = $charts[1];
+
+        self::assertEquals('Chart with Title and no Axis Labels', getTitleText($chart2->getTitle()));
+        self::assertEmpty(getTitleText($chart2->getXAxisLabel()));
+        self::assertEmpty(getTitleText($chart2->getYAxisLabel()));
+
+        // No title, only horizontal axis label
+        $chart3 = $charts[2];
+        self::assertEmpty(getTitleText($chart3->getTitle()));
+        self::assertEquals('Horizontal Axis Title Only', getTitleText($chart3->getXAxisLabel()));
+        self::assertEmpty(getTitleText($chart3->getYAxisLabel()));
+
+        // No title, only vertical axis label
+        $chart4 = $charts[3];
+        self::assertEmpty(getTitleText($chart4->getTitle()));
+        self::assertEquals('Vertical Axis Title Only', getTitleText($chart4->getYAxisLabel()));
+        self::assertEmpty(getTitleText($chart4->getXAxisLabel()));
+
+        // Title and both axis labels
+        $chart5 = $charts[4];
+        self::assertEquals('Complete Annotations', getTitleText($chart5->getTitle()));
+        self::assertEquals('Horizontal Axis Title', getTitleText($chart5->getXAxisLabel()));
+        self::assertEquals('Vertical Axis Title', getTitleText($chart5->getYAxisLabel()));
+    }
+}