Hi.
I'm making a drawing app and i want to be able to draw lines, rectangles, ellipses ,...
I've think making like this:
1- Save the starting point
Qt Code: 
  1. void mousePressEvent(QMouseEvent *event);
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2- Draw temporal shape based on the type of cursor
Qt Code: 
  1. void mouseMoveEvent(QMouseEvent *event);
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3- Finish the draw and add it to the scene
Qt Code: 
  1. void mouseReleaseEvent(QMouseEvent *event);
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But i don't know how to make the second step, drawing the temporal shape (rectangle, circle, line, ...) while the user has the button pressed until it's released.

Some ideas?