Add overlap to bar charts (#107)

3 files changed, 36 insertions, 0 deletions

diff --git a/examples/README.md b/examples/README.md
index eca725dc..5f53199e 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -44,6 +44,7 @@ Types:
 * [Line chart (3D)](3d_line_chart_example.md)
 * [Pie chart (3D)](3d_pie_chart_example.md)
 * [Scatter chart](scatter_chart_example.md)
+* [Stacked bar chart](stacked_bar_chart_example.md)
 
 Customizations:
 * [Chart colors](chart_colors_example.md)
diff --git a/examples/images/stacked_bar_chart_example.png b/examples/images/stacked_bar_chart_example.png
new file mode 100644
index 00000000..da046983
--- /dev/null
+++ b/examples/images/stacked_bar_chart_example.png
diff --git a/examples/stacked_bar_chart_example.md b/examples/stacked_bar_chart_example.md
new file mode 100644
index 00000000..3fbd2425
--- /dev/null
+++ b/examples/stacked_bar_chart_example.md
@@ -0,0 +1,35 @@
+## Description
+
+Stacked bar chart example
+
+## Code
+
+```ruby
+require 'axlsx'
+
+p = Axlsx::Package.new
+wb = p.workbook
+
+wb.add_worksheet(name: 'Bar Chart') do |sheet|
+  sheet.add_row ['A Simple Bar Chart', 'X', 'Y']
+
+  sheet.add_row ['A', 3, 4]
+  sheet.add_row ['B', 10, 6]
+  sheet.add_row ['C', 7, 2]
+
+  sheet.add_chart(Axlsx::BarChart, start_at: 'A6', end_at: 'F20') do |chart|
+    chart.add_series data: sheet['B2:B4'], labels: sheet['A2:A4'], title: sheet['B1']
+    chart.add_series data: sheet['C2:C4'], labels: sheet['A2:A4'], title: sheet['C1']
+
+    chart.bar_dir = :col
+    chart.overlap = 100
+    chart.grouping = :percentStacked
+  end
+end
+
+p.serialize 'stacked_bar_chart_example.xlsx'
+```
+
+## Output
+
+![Output](images/stacked_bar_chart_example.png "Output")