/**
@class wxMemoryDC
- @wxheader{dcmemory.h}
A memory device context provides a means to draw graphics onto a bitmap.
When drawing in to a mono-bitmap, using @c wxWHITE, @c wxWHITE_PEN and
/**
Constructs a new memory device context.
- Use the wxDC::Ok() member to test whether the constructor was
+ Use the wxDC::IsOk() member to test whether the constructor was
successful in creating a usable device context. Don't forget to select
a bitmap into the DC before drawing on it.
*/
wxMemoryDC();
+
+ /**
+ Constructs a new memory device context having the same characteristics
+ as the given existing device context.
+
+ This constructor creates a memory device context @e compatible with @a
+ dc in wxMSW, the argument is ignored in the other ports. If @a dc is
+ @NULL, a device context compatible with the screen is created, just as
+ with the default constructor.
+ */
+ wxMemoryDC(wxDC *dc);
+
/**
Constructs a new memory device context and calls SelectObject() with
the given bitmap.
- Use the wxDC::Ok() member to test whether the constructor was
+ Use the wxDC::IsOk() member to test whether the constructor was
successful in creating a usable device context.
*/
wxMemoryDC(wxBitmap& bitmap);
@ref overview_refcount).
Also, before using the updated bitmap data, make sure to select it out
- of context first (for example by selecting wxNullBitmap into the device
+ of context first (for example by selecting ::wxNullBitmap into the device
context).
@see wxDC::DrawBitmap()
the bitmap to a window. For this purpose, you may find wxDC::DrawIcon()
easier to use instead.
- If the argument is wxNullBitmap (or some other uninitialised wxBitmap)
+ If the argument is ::wxNullBitmap (or some other uninitialised wxBitmap)
the current bitmap is selected out of the device context, and the
original bitmap restored, allowing the current bitmap to be destroyed
safely.