In one thread calculate an approach to one curve, and in certain steps drawing the current curve and continue calculating, I emit a signal when I want draw this curve, I put a debug message to see the process to draw, like this:

Qt Code: 
  1. Thread::ProcessX()
  2. {
  3. ...
  4.    qDebug()<<"Draw";
  5.    emit draw();
  6.    qDebug()<<"Stop";
  7. ...
  8. }
  9. 77(signal send to DrawProcess() in the interface
  10. Interface::DrawProcess()
  11. {
  12.   qDebug()<<"Now";
  13.   ...
  14. }
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When I run the program, in the terminal i see this:
Qt Code: 
  1. Draw
  2. Stop
  3. Now
  4. Draw
  5. Stop
  6. Draw
  7. Stop
  8. Draw
  9. Stop
  10. Now
  11. Now
  12. Now
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What's up?

Please Help
P.D. Sorry for my bad english