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.

  • bar_chart_demo.f90 - Source demonstrating grouped and horizontal bars

  • Generated outputs in output/example/fortran/bar_chart_demo/

  • 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

ASCII output:

                      Categorical Bar Chart - Fruit Sales
+--------------------------------------------------------------------------------+
| 60                                                                             |
| *                                               -------------                  |
| *                                               -------------                  |
| 50                                              -------------                  |
| *               -------------                   -------------                  |
| *               -------------                   -------------                  |
| *               -------------                   -------------   -------------- |
| 40              -------------                   -------------   -------------- |
| *------------   -------------                   -------------   -------------- |
| *------------   -------------   -------------   -------------   -------------- |
| *------------   -------------   -------------   -------------   -------------- |
| 30-----------   -------------   -------------   -------------   -------------- |
| *------------   -------------   -------------   -------------   -------------- |
| *------------   -------------   -------------   -------------   -------------- |
| *------------   -------------   -------------   -------------   -------------- |
| 20-----------   -------------   -------------   -------------   -------------- |
| *------------   -------------   -------------   -------------   -------------- |
| *------------   -------------   -------------   -------------   -------------- |
| *------------   -------------   -------------   -------------   -------------- |
| 10-----------   -------------   -------------   -------------   -------------- |
| *------------   -------------   -------------   -------------   -------------- |
| *------------   -------------   -------------   -------------   -------------- |
| *--*---*---*-  *---*---*--*-- * --*---*---*-- * --*--*---*---*  -*---*---*---* |
|      1               2                3                4               5       |
+--------------------------------------------------------------------------------+
                                   Fruit Type
Units Sold

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Oo Grouped

oo_grouped.png

ASCII output:

                     Object API - grouped budget comparison
+--------------------------------------------------------------------------------+
|                                                                                |
|                                                                    =========== |
| 4                                                                  =========== |
| *                                                                # Baseline=== |
| *                                                                # Projected== |
| *                                      ==========        ----------=========== |
| *                                      ==========        ----------=========== |
| 3         ==========        ---------- ==========        ----------=========== |
| *         ==========        ---------- ==========        ----------=========== |
| *         ==========        ---------- ==========        ----------=========== |
| *---------==========        ---------- ==========        ----------=========== |
| *---------==========        ---------- ==========        ----------=========== |
| ----------==========        ---------- ==========        ----------=========== |
| 2---------==========        ---------- ==========        ----------=========== |
| *---------==========        ---------- ==========        ----------=========== |
| *---------==========        ---------- ==========        ----------=========== |
| *---------==========        ---------- ==========        ----------=========== |
| *---------==========        ---------- ==========        ----------=========== |
| 1---------==========        ---------- ==========        ----------=========== |
| *---------==========        ---------- ==========        ----------=========== |
| *---------==========        ---------- ==========        ----------=========== |
| *---------==========        ---------- ==========        ----------=========== |
| *------*--====*===== *      *------*-- ===*======*      *------*---===*======* |
|         1.0            1.5            2.0            2.5            3.0        |
+--------------------------------------------------------------------------------+
                                      Team
Quarterly budget (M$)

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Stacked Bars

stacked_bars.png

ASCII output:

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

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Stateful Grouped

stateful_grouped.png

ASCII output:

                        Stateful API - grouped bar chart
+--------------------------------------------------------------------------------+
|                                                                                |
| *                                                           ---------          |
| 6                                                           ---------          |
| *                                       ---------           -----# Product A   |
| *                   ---------           ---------           -----# Product B== |
| 5                   ---------           ---------           --------========== |
| *                   ---------           --------=========   --------========== |
| *                   ---------           --------=========   --------========== |
| *--------           --------=========   --------=========   --------========== |
| 4--------           --------=========   --------=========   --------========== |
| *--------           --------=========   --------=========   --------========== |
| *--------           --------=========   --------=========   --------========== |
| 3-------=========   --------=========   --------=========   --------========== |
| *-------=========   --------=========   --------=========   --------========== |
| *-------=========   --------=========   --------=========   --------========== |
| *-------=========   --------=========   --------=========   --------========== |
| 2-------=========   --------=========   --------=========   --------========== |
| *-------=========   --------=========   --------=========   --------========== |
| *-------=========   --------=========   --------=========   --------========== |
| 1-------=========   --------=========   --------=========   --------========== |
| *-------=========   --------=========   --------=========   --------========== |
| *-------=========   --------=========   --------=========   --------========== |
| *---*---=*====*==  *----*---*====*=== * ---*----*===*====*  --*----*====*===*= |
|       1.0        1.5       2.0        2.5        3.0       3.5        4.0      |
+--------------------------------------------------------------------------------+
                                    Quarter
Revenue (million $)

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Stateful Horizontal

stateful_horizontal.png

ASCII output:

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

Download ASCII

Download PDF