Added bar overlap property for 2d bar charts

docs/changes/1.0.0.md

@@ -17,6 +17,8 @@
 - PowerPoint2007 Reader : Load images in their initial format (and not by default in PNG) - [@polidog](https://github.com/polidog) GH-553
 
 ## Features
+- Support for bar overlap in 2D bar charts - [@mindline](https://github.com/mindline-analytics) GH-667
+    - PowerPoint2007 Writer
 - Support for the position of Legend in ODPresentation Writer - [@Progi1984](https://github.com/Progi1984) GH-355
 - Support for DoughnutChart - [@Progi1984](https://github.com/Progi1984) GH-355
     - ODPresentation Writer
@@ -102,4 +104,4 @@
 * `PhpOffice\PhpPresentation\Writer\PowerPoint2007\LayoutPack\PackDefault`
     * Removed class
 * `PhpOffice\PhpPresentation\Writer\PowerPoint2007\LayoutPack\TemplateBased`
-    * Removed class
+    * Removed class

docs/usage/shapes/chart.md

@@ -14,7 +14,7 @@ $chartShape = $slide->createChartShape();
 
 You can define how blank values are displayed with the method `setDisplayBlankAs`.
 
-![Slideshow type](/images/libreoffice_chart_displayblankas.png)
+![Slideshow type](../../images/libreoffice_chart_displayblankas.png)
 
 Differents types are available:
 
@@ -321,16 +321,37 @@ TODO
 
 #### Gap Width
 
-You can define the gap width between bar or columns clusters. It is defined in percent.
+You can define the gap width between bar or columns clusters. It is relatively defined as percentage of a bars width.
 The default value is 150%. The value must be defined between 0 and 500.
 
-``` php
+```php
 <?php
 
 $barChart = new Bar();
 $barChart->setGapWidthPercent(250);
 ```
 
+#### Overlap
+
+You can define the bar overlap within bar or column clusters. It is relatively defined as percentage of a bars width.
+The default value is `100%` for stacked and `0%` for grouped bar charts. The value must be defined between `-100` and `100`.
+
+When setting the bar grouping type, the default overlap values will be set. Any change to the overlap must be made after setting the bar grouping type through `setBarGrouping`.
+
+```php
+$barChart = new Bar();
+// will set the overlap to the default value for grouped bars: 0
+$barChart->setBarGrouping(Bar::GROUPING_CLUSTERED);
+
+// a positive value will result in an overlapping
+$barChart->setOverlapWidthPercent(25);
+
+// a negative value will result in a gap
+$barChart->setOverlapWidthPercent(-25);
+```
+
+![Bar Overlap](../../images/chart_bar_overlap.png)
+
 #### Stacking
 
 You can stack multiples series in a same chart. After adding multiples series, you can define the bar grouping with `setBarGrouping` method of AbstractTypeBar.
@@ -349,18 +370,11 @@ $barChart->setBarGrouping(Bar::GROUPING_STACKED);
 $barChart->setBarGrouping(Bar::GROUPING_PERCENTSTACKED);
 ```
 
-- Bar::GROUPING_CLUSTERED
-
-![Bar::GROUPING_CLUSTERED](/images/chart_columns_52x60.png)
-
-- Bar::GROUPING_STACKED
-
-![Bar::GROUPING_STACKED](/images/chart_columnstack_52x60.png)
-
-- Bar::GROUPING_PERCENTSTACKED
-
-![Bar::GROUPING_PERCENTSTACKED](/images/chart_columnpercent_52x60.png)
-
+|                                                                             | Type         | Constant                     |
+| --------------------------------------------------------------------------- | ------------ | ---------------------------- |
+| ![Bar::GROUPING_CLUSTERED](../../images/chart_columns_52x60.png)            | Grouped Bars | Bar::GROUPING_CLUSTERED      |
+| ![Bar::GROUPING_STACKED](../../images/chart_columnstack_52x60.png)          | Stacked Bars | Bar::GROUPING_STACKED        |
+| ![Bar::GROUPING_PERCENTSTACKED](../../images/chart_columnpercent_52x60.png) | Grouped Bars | Bar::GROUPING_PERCENTSTACKED |
 
 ### Line
 
@@ -418,4 +432,3 @@ $chart->setIsSmooth(false);
 // Get status of smooth line
 $chart->isSmooth();
 ```
-

src/PhpPresentation/Shape/Chart/Type/AbstractTypeBar.php

@@ -53,6 +53,14 @@ class AbstractTypeBar extends AbstractType
      */
     protected $gapWidthPercent = 150;
 
+    /**
+     * Overlap within bar or columns clusters. Value between 100 and -100 percent.
+     * For stacked bar charts, the default overlap will be 100, for grouped bar charts 0.
+     *
+     * @var int
+     */
+    protected $overlapWidthPercent = 0;
+
     /**
      * Set bar orientation.
      *
@@ -87,6 +95,11 @@ public function getBarDirection()
     public function setBarGrouping($value = self::GROUPING_CLUSTERED)
     {
         $this->barGrouping = $value;
+        $this->overlapWidthPercent = 0;
+
+        if ($value === self::GROUPING_STACKED || $value === self::GROUPING_PERCENTSTACKED) {
+            $this->overlapWidthPercent = 100;
+        }
 
         return $this;
     }
@@ -127,6 +140,32 @@ public function setGapWidthPercent($gapWidthPercent)
         return $this;
     }
 
+    /**
+     * @return int
+     */
+    public function getOverlapWidthPercent(): int
+    {
+        return $this->overlapWidthPercent;
+    }
+
+    /**
+     * @param int $value overlap width percentage
+     *
+     * @return self
+     */
+    public function setOverlapWidthPercent(int $value): self
+    {
+        if ($value < -100) {
+            $value = -100;
+        }
+        if ($value > 100) {
+            $value = 100;
+        }
+        $this->overlapWidthPercent = $value;
+
+        return $this;
+    }
+
     /**
      * Get hash code.
      *

src/PhpPresentation/Writer/PowerPoint2007/PptCharts.php

@@ -985,13 +985,8 @@ protected function writeTypeBar(XMLWriter $objWriter, Bar $subject, bool $includ
         $objWriter->endElement();
 
         // c:overlap
-        $barGrouping = $subject->getBarGrouping();
         $objWriter->startElement('c:overlap');
-        if (Bar::GROUPING_CLUSTERED === $barGrouping) {
-            $objWriter->writeAttribute('val', '0');
-        } elseif (Bar::GROUPING_STACKED === $barGrouping || Bar::GROUPING_PERCENTSTACKED === $barGrouping) {
-            $objWriter->writeAttribute('val', '100');
-        }
+        $objWriter->writeAttribute('val', $subject->getOverlapWidthPercent());
         $objWriter->endElement();
 
         // c:axId

tests/PhpPresentation/Tests/Shape/Chart/Type/BarTest.php

@@ -90,6 +90,32 @@ public function testGapWidthPercent(): void
         $this->assertEquals(500, $object->getGapWidthPercent());
     }
 
+    public function testOverlapWidthPercentDefaults(): void
+    {
+        $object = new Bar();
+        $this->assertEquals(0, $object->getOverlapWidthPercent());
+
+        $object->setBarGrouping(Bar::GROUPING_STACKED);
+        $this->assertEquals(100, $object->getOverlapWidthPercent());
+        $object->setBarGrouping(Bar::GROUPING_CLUSTERED);
+        $this->assertEquals(0, $object->getOverlapWidthPercent());
+        $object->setBarGrouping(Bar::GROUPING_PERCENTSTACKED);
+        $this->assertEquals(100, $object->getOverlapWidthPercent());
+    }
+
+    public function testOverlapWidthPercent(): void
+    {
+        $value = mt_rand(-100, 100);
+        $object = new Bar();
+        $this->assertEquals(0, $object->getOverlapWidthPercent());
+        $this->assertInstanceOf(Bar::class, $object->setOverlapWidthPercent($value));
+        $this->assertEquals($value, $object->getOverlapWidthPercent());
+        $this->assertInstanceOf(Bar::class, $object->setOverlapWidthPercent(101));
+        $this->assertEquals(100, $object->getOverlapWidthPercent());
+        $this->assertInstanceOf(Bar::class, $object->setOverlapWidthPercent(-101));
+        $this->assertEquals(-100, $object->getOverlapWidthPercent());
+    }
+
     public function testHashCode(): void
     {
         $oSeries = new Series();

tests/PhpPresentation/Tests/Writer/PowerPoint2007/PptChartsTest.php

@@ -582,6 +582,7 @@ public function testTypeBar(): void
         $oShape->setResizeProportional(false)->setHeight(550)->setWidth(700)->setOffsetX(120)->setOffsetY(80);
         $oBar = new Bar();
         $oBar->setGapWidthPercent($valueGapWidthPercent);
+        $oBar->setOverlapWidthPercent(-10);
         $oSeries = new Series('Downloads', $this->seriesData);
         $oSeries->getDataPointFill(0)->setFillType(Fill::FILL_SOLID)->setStartColor(new Color(Color::COLOR_BLUE));
         $oSeries->getDataPointFill(1)->setFillType(Fill::FILL_SOLID)->setStartColor(new Color(Color::COLOR_DARKBLUE));
@@ -603,6 +604,8 @@ public function testTypeBar(): void
         $this->assertZipXmlElementEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, $oSeries->getTitle());
         $element = '/c:chartSpace/c:chart/c:plotArea/c:barChart/c:gapWidth';
         $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'val', $valueGapWidthPercent);
+        $element = '/c:chartSpace/c:chart/c:plotArea/c:barChart/c:overlap';
+        $this->assertZipXmlAttributeEquals('ppt/charts/' . $oShape->getIndexedFilename(), $element, 'val', $oBar->getOverlapWidthPercent());
 
         $this->assertIsSchemaECMA376Valid();
     }