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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.
My example is for macOS/AppKit in Objective-C, so your mileage may vary for iOS, but basically you override drawRect:. The same calls that would have drawn into a view on the screen would render PDF for the printer.
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