CSV Plotter with SDL2 and Cairo

This program reads a CSV file with four lines of numerical data and plots them as colored lines. It displays the result in an SDL2 window with horizontal scrolling and saves the output as a PNG file (plot.png).

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Features

• Plots DevTime, ReviewTime, and LeadTime from a CSV file.
• Compute at-fly and plots MeanTAT, a.k.a Mean Turnarround Time.
• Y-axis ranges from 0 to 30, shown on the left.
• X-axis shows months starting from September 2025.
• Horizontal scroll bar is visible if the data exceeds the window width.
• Supports scrolling with arrow keys or mouse dragging.
• Output PNG file has a width proportional to the number of months (minimum 1600 px).

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Requirements

• GCC or compatible C compiler
• SDL2 and SDL2_gfx libraries
• Cairo graphics library
• pkg-config

Install on Linux (Debian/Ubuntu)

sudo apt-get install build-essential libsdl2-dev libsdl2-gfx-dev libcairo2-dev
pkg-config

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Build

Use the provided Makefile or compile manually:

make release

Or manually:

gcc plot.c -o plot $(pkg-config --cflags --libs sdl2) -lSDL2_gfx $(pkg-config
--cflags --libs cairo)

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Usage

./plot data.csv

Where data.csv has exactly four lines, each representing a different metric:

1. Plot EPOCH first line
2. DevTime – second line
3. ReviewTime – third line
4. LeadTime – fourth line

CSV format

• EPOCH must separated by /
• Numbers must be separated by commas.
• Important: Each line, except first one, must end with a comma.
• Example:

9/2025
5,8,6,7,9,10,8,7,6,5,7,8,
4,6,5,6,7,8,7,6,5,4,6,7,
12,14,13,15,16,18,17,16,14,13,15,16,

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Notes

• X-axis increments by months starting from September 2025.
• Y-axis shows values from 0 to 30.
• Horizontal scroll allows viewing all months if there are more than fit the window.
• The program saves a PNG (plot.png) with the same width as the total plotted months.

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Example

Suppose your data.csv contains:

9/2025
10,12,8,15,
5,6,4,7,
20,18,15,25,

Running:

./plot data.csv

• Shows a window with the plotted lines for 4 months.
• PNG file plot.png is generated with the same plot.
• Scroll horizontally if necessary to see all months.
• There is a CSV data example at config/ folder.

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License

MIT License This project is free to use and modify.