Bar Chart Demo

Bar Chart Demo

Source: bar_chart_demo.f90

Demonstrates grouped bar charts (vertical and horizontal) via both the stateful API and figure_t.

  • Grouped bars: Compare multiple series per category
  • Horizontal bars: Present ranked metrics across categories
  • OO workflow: Call bar_impl with an explicit figure_t instance to avoid globals
  • Multiple formats: Save PNG, PDF, and ASCII outputs for each scenario

Running the demo generates: - stateful_grouped.(png|pdf|txt) - Vertical grouped comparison - stateful_horizontal.(png|pdf|txt) - Horizontal completion chart - oo_grouped.(png|pdf|txt) - Object API grouped budget comparison

Perfect for showcasing categorical comparisons and verifying bar chart support in fortplot.

Files

  • bar_chart_demo.f90 - Source code
  • Generated media in output/example/fortran/bar_chart_demo/

Running

make example ARGS="bar_chart_demo"

Output

Categorical Labels

categorical_labels.png

Text backend output 


                      Categorical Bar Chart - Fruit Sales
Units Sold
+--------------------------------------------------------------------------------+
|                                                                                |
| 60                                                                             |
| |                                              ------------                    |
| 50                                             ------------                    |
| |                 ------------                 ------------                    |
| |                 ------------                 ------------                    |
| |                 ------------                 ------------                    |
| |                 ------------                 ------------  -------------     |
| 40                ------------                 ------------  -------------     |
| |  -------------  ------------                 ------------  -------------     |
| |  -------------  ------------  -------------  ------------  -------------     |
| |  -------------  ------------  -------------  ------------  -------------     |
| 30 -------------  ------------  -------------  ------------  -------------     |
| |  -------------  ------------  -------------  ------------  -------------     |
| |  -------------  ------------  -------------  ------------  -------------     |
| |  -------------  ------------  -------------  ------------  -------------     |
| 20 -------------  ------------  -------------  ------------  -------------     |
| |  -------------  ------------  -------------  ------------  -------------     |
| |  -------------  ------------  -------------  ------------  -------------     |
| 10 -------------  ------------  -------------  ------------  -------------     |
| |  -------------  ------------  -------------  ------------  -------------     |
| |  -------------  ------------  -------------  ------------  -------------     |
| +-------+--------------+--------------+--------------+--------------+--------- |
|      Apples         Oranges        Bananas        Grapes         Mangoes       |
+--------------------------------------------------------------------------------+
                                   Fruit Type

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Oo Grouped

oo_grouped.png

Text backend output 


                     Object API - grouped budget comparison
Quarterly budget (M$)
+--------------------------------------------------------------------------------+
|                                                                                |
| |                                                                              |
| |                                                                #+++#+++#     |
| 4                                                                  Baseline    |
| |                                                                  Projected   |
| 3                                                                #+++++++#     |
| |                                      #+++#+++#       ----------#+++++++#     |
| |           #+++#++++#                 #+++++++#       ----------#+++++++#     |
| |           #++++++++#       --------- #+++++++#       ----------#+++++++#     |
| |           #++++++++#       --------- #+++++++#       ----------#+++++++#     |
| |  ---------#++++++++#       --------- #+++++++#       ----------#+++++++#     |
| |  ---------#++++++++#       --------- #+++++++#       ----------#+++++++#     |
| |  ---------#++++++++#       --------- #+++++++#       ----------#+++++++#     |
| 2  ---------#++++++++#       --------- #+++++++#       ----------#+++++++#     |
| |  ---------#++++++++#       --------- #+++++++#       ----------#+++++++#     |
| |  ---------#++++++++#       --------- #+++++++#       ----------#+++++++#     |
| |  ---------#++++++++#       --------- #+++++++#       ----------#+++++++#     |
| |  ---------#++++++++#       --------- #+++++++#       ----------#+++++++#     |
| 1  ---------#++++++++#       --------- #+++++++#       ----------#+++++++#     |
| |  ---------#++++++++#       --------- #+++++++#       ----------#+++++++#     |
| |  ---------#++++++++#       --------- #+++++++#       ----------#+++++++#     |
| |  ---------#++++++++#       --------- #+++++++#       ----------#+++++++#     |
| +----------+#---#----#----------------+#---#---#-----------------#---#---#---- |
|         Team 1                     Team 2                     Team 3           |
+--------------------------------------------------------------------------------+
                                      Team

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Stacked Bars

stacked_bars.png

Text backend output 


                    Stacked Bar Chart - Department Expenses
Expenses (million $)
+--------------------------------------------------------------------------------+
|                                                                                |
| |                                                                              |
| 35                                                        #===#===#==#===#     |
| |                    #===#===#==#===#                          Manufacturing   |
| |                    #==============#   #===#==#===#===#       Sales           |
| 30                   #==============#   #==============#       R&D             |
| 25                   #==============#   #==============#  #+++#+++#++#+++#     |
| |                    #+++#+++#++#+++#   #+++#++#+++#+++#  #++++++++++++++#     |
| |  #===#==#===#===#  #++++++++++++++#   #++++++++++++++#  #++++++++++++++#     |
| |  #==============#  #++++++++++++++#   #++++++++++++++#  #++++++++++++++#     |
| |  #==============#  #++++++++++++++#   #++++++++++++++#  #++++++++++++++#     |
| 20 #+++#++#+++#+++#  #++++++++++++++#   #++++++++++++++#  #---#---#--#---#     |
| |  #++++++++++++++#  #---#---#--#---#   #++++++++++++++#  ----------------     |
| |  #++++++++++++++#  ----------------   #++++++++++++++#  ----------------     |
| |  #++++++++++++++#  ----------------   #---#--#---#---#  ----------------     |
| 15 #---#--#---#---#  ----------------   ----------------  ----------------     |
| |  ----------------  ----------------   ----------------  ----------------     |
| |  ----------------  ----------------   ----------------  ----------------     |
| 10 ----------------  ----------------   ----------------  ----------------     |
| |  ----------------  ----------------   ----------------  ----------------     |
| |  ----------------  ----------------   ----------------  ----------------     |
| 5  ----------------  ----------------   ----------------  ----------------     |
| |  ----------------  ----------------   ----------------  ----------------     |
| ++--------+--------+---------+--------+--------+---------+--------+--------+-- |
| 0.5      1.0      1.5       2.0      2.5      3.0       3.5      4.0      4.5  |
+--------------------------------------------------------------------------------+
                                    Quarter

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Stateful Grouped

stateful_grouped.png

Text backend output 


                        Stateful API - grouped bar chart
Revenue (million $)
+--------------------------------------------------------------------------------+
| 7                                                                              |
| |                                                                              |
| |                                                                              |
| 6                                                         ----     Product A   |
| 5                                       --------          ----     Product B   |
| |                    ---------          --------          --------#+++#++#     |
| |                    ---------          --------          --------#++++++#     |
| |                    ---------          -------#+++#+++#  --------#++++++#     |
| |                    ---------          -------#+++++++#  --------#++++++#     |
| |  --------          --------#++#+++#   -------#+++++++#  --------#++++++#     |
| 4  --------          --------#++++++#   -------#+++++++#  --------#++++++#     |
| |  --------          --------#++++++#   -------#+++++++#  --------#++++++#     |
| |  --------          --------#++++++#   -------#+++++++#  --------#++++++#     |
| 3  -------#+++#+++#  --------#++++++#   -------#+++++++#  --------#++++++#     |
| |  -------#+++++++#  --------#++++++#   -------#+++++++#  --------#++++++#     |
| |  -------#+++++++#  --------#++++++#   -------#+++++++#  --------#++++++#     |
| |  -------#+++++++#  --------#++++++#   -------#+++++++#  --------#++++++#     |
| 2  -------#+++++++#  --------#++++++#   -------#+++++++#  --------#++++++#     |
| |  -------#+++++++#  --------#++++++#   -------#+++++++#  --------#++++++#     |
| |  -------#+++++++#  --------#++++++#   -------#+++++++#  --------#++++++#     |
| 1  -------#+++++++#  --------#++++++#   -------#+++++++#  --------#++++++#     |
| |  -------#+++++++#  --------#++++++#   -------#+++++++#  --------#++++++#     |
| |  -------#+++++++#  --------#++++++#   -------#+++++++#  --------#++++++#     |
| +---------#---#---#----------#--#---#----------#---#---#----------#---#--#---- |
|          Q1                 Q2                Q3                 Q4            |
+--------------------------------------------------------------------------------+
                                    Quarter

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Stateful Horizontal

stateful_horizontal.png

Text backend output 


                      Stateful API - horizontal bar chart
Training module
+--------------------------------------------------------------------------------+
|                                                                                |
| 4.0                                                                            |
| |-------------------------------------------------------------------------     |
| |----------------------------------------------     Certification completion   |
| |-------------------------------------------------------------------------     |
| |-------------------------------------------------------------------------     |
| 3.5                                                                            |
| |--------------------------------------------------------------------          |
| |--------------------------------------------------------------------          |
| |--------------------------------------------------------------------          |
| |--------------------------------------------------------------------          |
| 3.0                                                                            |
| 2.5                                                                            |
| 2.0--------------------------------------------------                          |
| |----------------------------------------------------                          |
| |----------------------------------------------------                          |
| |----------------------------------------------------                          |
| 1.5                                                                            |
| |----------------------------------------------------------                    |
| 1.0--------------------------------------------------------                    |
| |----------------------------------------------------------                    |
| +---------------+---------------+----------------+---------------+------------ |
| 0              20              40               60              80             |
+--------------------------------------------------------------------------------+
                                 Completion (%)

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