how to clone a solidbrush in GDI+ C++

Question

I am using gdi+ and c++. I have a question about SolidBrush. How To clone a SolidBrush?

SolidBrush* oldBrush xxx;
Brush* newBrush = oldBrush->Clone();

I found newBrush is a Brush Object. Which mean if I use dynamic_cast<SolidBrush>(newBursh), I will always get NULL.

I read the .h file of gdi+ SolidBrush seems used Brush's virtual Clone method, it do not override it!

Why?

Thanks for solutions, but I still have a question? why SolidBrush do not implement Clone Method?

Answer 1

Brush can do everything SolidBrush can. SolidBrush is just a convenient way to create a Brush with a solid color.

Here's an example derived from this example at MSDN:

SolidBrush solidBrush(Color(255,255,0,0));
Brush *clone = solidBrush.Clone();

You can then just go ahead and use clone like any other brush and it'll behave exactly like solidBrush.

Answer 2

why SolidBrush do not implement Clone Method?

SolidBrush inherits the clone method from Brush. Implementing it again in SolidBrush would be redundant.