>> I call drawline() draw some lines in the window, but I found that
>> if I call redraw() function to redraw the whole window, the lines
>> I drawed before will be cleared. Why?

> The usual way to handle this is to derive your own class from an
> existing FLTK class, and override the draw() member function to call
> drawline() etc. as needed.

See http://www.fltk.org/doc-2.0/html/index.html then go to the
chapter "Making your own widgets" and section "Drawing the widget"

D
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