Main problems

• Currently when digitizer crashes, the whole GUI also crashes.
  • Caused by the bad handling of the memory by digitizer or...?
  • Requires complete re-design of vector digitizer.

Requested functionality

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Proposal: Use pygrass

Use pygrass to access vectors.

Basic usage

• possibly better and easier memory handling
• will improve also pygrass
• avoids code duplication (some interface would be needed for digitizer anyway)

Solving the crashing in the future

1. use pygrass
2. use factory design pattern
   • create objects using factory
   • everyone expects the interface provided by pygrass
3. create new set of classes with the same interface as pygrass
   • these classes are using modules and not library calls
   • other implementations are also possible
4. replace old factory with the new creating new classes
5. it is possible to switch between these two ways dynamically