Your question is confused.
Start by reading the Graphics View Framework - it will explain the general way things work.
Then, if your have specific questions about that, it will be easier to give you an answer.
Your question is confused.
Start by reading the Graphics View Framework - it will explain the general way things work.
Then, if your have specific questions about that, it will be easier to give you an answer.
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S.O.L.I.D principles (use them!):
https://en.wikipedia.org/wiki/SOLID_...iented_design)
Do you write clean code? - if you are TDD'ing then maybe, if not, your not writing clean code.
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