I started building a class to record dc operations in a list. I have a
preliminary version and would like to get a review of the code. It's
been a while since I did much C++ coding so if something looks strange,
that is why
The class is pretty simple. It stores the operations as a linked list
of nodes of different types depending on what argument types a given
method has. Each list node is associated with an id so that operations
can be segmented by what actual object they represent. Then if an
object is changed, you can remove the operations associated with that
object and then re-draw it.
I also do some coarse clipping to speed things up. I hope to do this
clipping at the object level in the future but right now it is done for
any drawing operation that I can be sure is outside of the rect that is
passed in. Doing it at the object level would allow SetXXX functions
and things like DrawText to be clipped where I can't easily tell whether
they are needed or not.
Have a look at the code and let me know how it looks. I've only
implemented a few of the dc methods so far. I'll implement the rest
once I'm sure the architecture is ok.
I started building a class to record dc operations in a list. I have a
preliminary version and would like to get a review of the code. It's
been a while since I did much C++ coding so if something looks strange,
that is why
The class is pretty simple. It stores the operations as a linked list
of nodes of different types depending on what argument types a given
method has. Each list node is associated with an id so that operations
can be segmented by what actual object they represent. Then if an
object is changed, you can remove the operations associated with that
object and then re-draw it.
I also do some coarse clipping to speed things up. I hope to do this
clipping at the object level in the future but right now it is done for
any drawing operation that I can be sure is outside of the rect that is
passed in. Doing it at the object level would allow SetXXX functions
and things like DrawText to be clipped where I can't easily tell whether
they are needed or not.
Have a look at the code and let me know how it looks. I've only
implemented a few of the dc methods so far. I'll implement the rest
once I'm sure the architecture is ok.
1. wxWidgets has some container classes already, you might think about using one of them for your list.
2. Instead of having the big switch statement in the DrawTo methods I would move the drawing operations out to the node classes. Give each one of them virtual Draw(dc) and Draw(dc, rect) methods, then the playback loop becomes simply something like this:
