|
Display Device Context Defaults
Upon first creating a display DC, Windows assigns default values for the
attributes (that is, drawing objects, colors, and modes) that comprise the DC. The
following table shows the default values for the attributes of a display DC.
Attribute
| Default value
| Background color
| Background color setting from Windows Control Panel (typically, white).
| Background mode
| OPAQUE.
| Bitmap
| None.
| Brush
| WHITE_BRUSH.
| Brush origin
| (0,0).
| Clipping region
| Entire window or client area with the update region clipped, as appropriate.
Child and pop-up windows in the client area may also be clipped.
| Palette
| DEFAULT_PALETTE.
| Current pen position
| (0,0).
| Device origin
| Upper left corner of the window or the client area.
| Drawing mode
| R2_COPYPEN.
| Font
| SYSTEM_FONT (SYSTEM_FIXED_FONT for applications written to run with Windows
versions 3.0 and earlier).
| Intercharacter spacing
| 0.
| Mapping mode
| MM_TEXT.
| Pen
| BLACK_PEN.
| Polygon-fill mode
| ALTERNATE.
| Stretch mode
| BLACKONWHITE.
| Text color
| Text color setting from Control Panel (typically, black).
| Viewport extent
| (1,1).
| Viewport origin
| (0,0).
| Window extent
| (1,1).
| Window origin
| (0,0).
|
An application can modify the values of the display DC attributes by using
selection and attribute functions, such as SelectObject, SetMapMode, and SetTextColor. For example, an application can modify the default units of measure in the
coordinate system by using SetMapMode to change the mapping mode.
Changes to the attribute values of a common, parent, or window DC are not
permanent. When an application releases these DCs, the current selections, such as
mapping mode and clipping region, are lost as the context is returned to the
cache. Changes to a class or private DC persist indefinitely. To restore them to
their original defaults, an application must explicitly set each attribute.
| Last news from Greatis Software |
 |
|
Nostalgia .Net |
|
.Net is powerful, but not all-powerful, so sometimes we need to use Win32 API for our .Net applications. It's simple enough with Platform Invoke if you have Win32 skill, but we do not always have time to dig the ancient documentation, declare the special types that are compatible with Win32, find the values of the Win32's constants and so on. Nostalgia .Net offers several simple-to-use classes, and components that will allow you to forget about the headache of Win32 and just use the power of Win32 in your application the same way as you use the native. Net classes. More » |
| Recommended software for developers |
 |
|
Ultimate Pack |
|
Component pack for Delphi and C++ Builder that contains runtime form designer, runtime object inspector, print suite and much more for the very special price. More » |
 |
|
Form Designer .Net |
|
Unique runtime form design solution that allows to edit any form in .Net WinForms application at runtime with full source codes for only 300 euro! More » |
 |
|
Print Suite .Net |
|
Print Suite .Net is a set of components for easy printing texts, images and grids from your WinForms applications. Full C# source codes are available More » |
 |
|
Gradient Controls .Net |
|
Gradient Controls .Net offers controls with gradient background feature. Labels, panels and so on... Full C# source codes are available More » |
 |
|
Greatis iGrid |
|
iGrid plots drawing grid right over your desktop, so you can use it everywhere, with any drawing application without any special plugins for different graphic editors. More » |
All the contacts and projectsDmitry Vasiliev (just.dmitry)
Related LinksSoftware for Visual Studio .NET developers
Software for Delphi and C++ Builder developers
Software for Visual Basic 6 developers
Delphi Tips&Tricks
MegaDetailed.NET More Online Helps Win32 Programmer's Reference
Win32 Multimedia Programmer's Reference
OLE Programmer's Reference
Microsoft Windows Pen API Programmer's Reference
Microsoft Windows Sockets 2 Reference
Microsoft Windows Telephony API (TAPI) Programmer's Reference
Unix Manual Pages
|
