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some silly questions

 
sheng zhong
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What is this base class use for? I can't understand the meaning. Please give me some clue, thank you!

 
sheng zhong
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Use the following two files from the above class, we can draw line on the white canvas. Why? I try to read these 2 files, but seems difficult for me to understand. Anybody give me some description. I will appreciate that very much!!!




 
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