A memory device context provides a means to draw graphics onto a bitmap. Notice that the memory DC must be deleted (or the bitmap selected out of it) before a bitmap can be reselected into another memory DC. And, before performing any other operations on the bitmap data, the bitmap must be selected out of the memory DC:
tempdc.selectObject(wNilBitmap) # here wNilBitmap is a predefined bitmap
Like other DC object, wMemoryDC need nim's destructors to release the resource.
| Superclass: | wDC |
|---|
Procs
proc selectObject(self: var wMemoryDC; bitmap: wBitmap) {...}{.raises: [wNilAccess], tags: [].}
- Selects the given bitmap into the device context, to use as the memory bitmap.
proc MemoryDC(): wMemoryDC {...}{.raises: [wNilAccess, IndexDefect, wFontError, wPenError, wBrushError], tags: [RootEffect].}
- Constructs a new memory device context.
proc MemoryDC(dc: wDC): wMemoryDC {...}{.raises: [wNilAccess, IndexDefect, wFontError, wPenError, wBrushError], tags: [RootEffect].}
- Constructs a new memory device context compatible with the specified device.
proc delete(self: var wMemoryDC) {...}{.raises: [], tags: [].}
- Nim's destructors will delete this object by default. However, sometimes you maybe want to do that by yourself.