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libui
Simple and portable (but not inflexible) GUI library in C that uses the native GUI technologies of each platform it supports.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
For the GUI you will need a library or framework that interacts with your specifiv operating system and allows you to create windows and a canvas to which you can draw. You could give libui a chance.
But it's probably easier to create an image file. I recommend using a library that takes care of the image format, e.g. you could use stb_image. Then you can focus on creating the image itself.
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