VC学习笔记（20090821）

DC：设备描述表

GDI：图形设备接口

CDC：MFC将DC和GDI封装在一起的产物

 

RECT：结构体，用于定义一个矩形的位置和大小

CRect：RECT的派生类，增加了很多方法

CPoint：用于定义一个点

 

CDC Members

 

Base Class Members

CObject Members

Color and Color Palette Functions	Font Functions
Construction/Destruction	Line-Output Functions
Coordinate Functions	Path Functions
Data Members	Clipping Functions
Device-Context Functions	Ellipse and Polygon Functions
Drawing-Attribute Functions	Printer Escape Functions
Drawing-Tool Functions	Bitmap Functions
Initialization	Simple Drawing Functions
Layout Functions	Metafile Functions
Mapping Functions	Scrolling Functions
Region Functions	Text Functions
Type-Safe Selection. Helpers

Data Members

m_hAttribDC	The attribute-device context used by this CDC object.
m_hDC	The output-device context used by this CDC object.

Construction

CDC	Constructs a CDC object.

Initialization

Attach	Attaches a Windows device context to this CDC object.
CreateCompatibleDC	Creates a memory-device context that is compatible with another device context. You can use it to prepare images in memory.
CreateDC	Creates a device context for a specific device.
CreateIC	Creates an information context for a specific device. This provides a fast way to get information about the device without creating a device context.
DeleteDC	Deletes the Windows device context associated with this CDC object.
DeleteTempMap	Called by the CWinApp idle-time handler to delete any temporary CDC object created by FromHandle. Also detaches the device context.
Detach	Detaches the Windows device context from this CDC object.
FromHandle	Returns a pointer to a CDC object when given a handle to a device context. If a CDC object is not attached to the handle, a temporary CDC object is created and attached.
GetCurrentBitmap	Returns a pointer to the currently selected CBitmap object.
GetCurrentBrush	Returns a pointer to the currently selected CBrush object.
GetCurrentFont	Returns a pointer to the currently selected CFont object.
GetCurrentPalette	Returns a pointer to the currently selected CPalette object.
GetCurrentPen	Returns a pointer to the currently selected CPen object.
GetGraphicsMode	Retrieves the current graphics mode for the specified device context.
GetWindow	Returns the window associated with the display device context.
ReleaseAttribDC	Releases m_hAttribDC, the attribute device context.
ReleaseOutputDC	Releases m_hDC, the output device context.
SetAttribDC	Sets m_hAttribDC, the attribute device context.
SetOutputDC	Sets m_hDC, the output device context.
SetGraphicsMode	Sets the current graphics mode for the specified device context.

Device-Context Functions

GetDeviceCaps	Retrieves a specified kind of device-specific information about a given display device's capabilities.
GetSafeHdc	Returns m_hDC, the output device context.
IsPrinting	Determines whether the device context is being used for printing.
ResetDC	Updates the m_hAttribDC device context.
RestoreDC	Restores the device context to a previous state saved with SaveDC.
SaveDC	Saves the current state of the device context.

Drawing-Tool Functions

EnumObjects	Enumerates the pens and brushes available in a device context.
GetBrushOrg	Retrieves the origin of the current brush.
SetBrushOrg	Specifies the origin for the next brush selected into a device context.

Type-Safe Selection Helpers

SelectObject	Selects a GDI drawing object such as a pen.
SelectStockObject	Selects one of the predefined stock pens, brushes, or fonts provided by Windows.

Color and Color Palette Functions

GetHalftoneBrush	Retrieves a halftone brush.
GetNearestColor	Retrieves the closest logical color to a specified logical color that the given device can represent.
RealizePalette	Maps palette entries in the current logical palette to the system palette.
SelectPalette	Selects the logical palette.
UpdateColors	Updates the client area of the device context by matching the current colors in the client area to the system palette on a pixel-by-pixel basis.

Drawing-Attribute Functions

GetBkColor	Retrieves the current background color.
GetBkMode	Retrieves the background mode.
GetColorAdjustment	Retrieves the color adjustment values for the device context.
GetDCBrushColor	Retrieves the current brush color.
GetDCPenColor	Retrieves the current pen color.
GetPolyFillMode	Retrieves the current polygon-filling mode.
GetROP2	Retrieves the current drawing mode.
GetStretchBltMode	Retrieves the current bitmap-stretching mode.
GetTextColor	Retrieves the current text color.
SetBkColor	Sets the current background color.
SetBkMode	Sets the background mode.
SetColorAdjustment	Sets the color adjustment values for the device context using the specified values.
SetDCBrushColor	Sets the current brush color.
SetDCPenColor	Sets the current pen color.
SetPolyFillMode	Sets the polygon-filling mode.
SetROP2	Sets the current drawing mode.
SetStretchBltMode	Sets the bitmap-stretching mode.
SetTextColor	Sets the text color.

Mapping Functions

GetMapMode	Retrieves the current mapping mode.
GetViewportExt	Retrieves the x- and y-extents of the viewport.
GetViewportOrg	Retrieves the x- and y-coordinates of the viewport origin.
GetWindowExt	Retrieves the x- and y-extents of the associated window.
GetWindowOrg	Retrieves the x- and y-coordinates of the origin of the associated window.
GetWorldTransform	Retrieves the current world-space to page-space transformation.
ModifyWorldTransform	Changes the world transformation for a device context using the specified mode.
OffsetViewportOrg	Modifies the viewport origin relative to the coordinates of the current viewport origin.
OffsetWindowOrg	Modifies the window origin relative to the coordinates of the current window origin.
ScaleViewportExt	Modifies the viewport extent relative to the current values.
ScaleWindowExt	Modifies the window extents relative to the current values.
SetMapMode	Sets the current mapping mode.
SetViewportExt	Sets the x- and y-extents of the viewport.
SetViewportOrg	Sets the viewport origin.
SetWindowExt	Sets the x- and y-extents of the associated window.
SetWindowOrg	Sets the window origin of the device context.
GetWorldTransform	Sets the current world-space to page-space transformation.

Layout Functions

GetLayout	Retrieves the layout of a device context (DC). The layout can be either left to right (default) or right to left (mirrored).
SetLayout	Changes the layout of a device context (DC).

Coordinate Functions

DPtoHIMETRIC	Converts device units into HIMETRIC units.
DPtoLP	Converts device units into logical units.
HIMETRICtoDP	Converts HIMETRIC units into device units.
HIMETRICtoLP	Converts HIMETRIC units into logical units.
LPtoDP	Converts logical units into device units.
LPtoHIMETRIC	Converts logical units into HIMETRIC units.

Region Functions

FillRgn	Fills a specific region with the specified brush.
FrameRgn	Draws a border around a specific region using a brush.
InvertRgn	Inverts the colors in a region.
PaintRgn	Fills a region with the selected brush.

Clipping Functions

ExcludeClipRect	Creates a new clipping region that consists of the existing clipping region minus the specified rectangle.
ExcludeUpdateRgn	Prevents drawing within invalid areas of a window by excluding an updated region in the window from a clipping region.
GetBoundsRect	Returns the current accumulated bounding rectangle for the specified device context.
GetClipBox	Retrieves the dimensions of the tightest bounding rectangle around the current clipping boundary.
IntersectClipRect	Creates a new clipping region by forming the intersection of the current region and a rectangle.
OffsetClipRgn	Moves the clipping region of the given device.
PtVisible	Specifies whether the given point is within the clipping region.
RectVisible	Determines whether any part of the given rectangle lies within the clipping region.
SelectClipRgn	Combines the given region with the current clipping region by using the specified mode.
SetBoundsRect	Controls the accumulation of bounding-rectangle information for the specified device context.

Line-Output Functions

AngleArc	Draws a line segment and an arc, and moves the current position to the ending point of the arc.
Arc	Draws an elliptical arc.
ArcTo	Draws an elliptical arc. This function is similar to Arc, except that the current position is updated.
GetArcDirection	Returns the current arc direction for the device context.
GetCurrentPosition	Retrieves the current position of the pen (in logical coordinates).
LineTo	Draws a line from the current position up to, but not including, a point.
MoveTo	Moves the current position.
PolyBezier	Draws one or more Bzier splines. The current position is neither used nor updated.
PolyBezierTo	Draws one or more Bzier splines, and moves the current position to the ending point of the last Bzier spline.
PolyDraw	Draws a set of line segments and Bzier splines. This function updates the current position.
Polyline	Draws a set of line segments connecting the specified points.
PolylineTo	Draws one or more straight lines and moves the current position to the ending point of the last line.
PolyPolyline	Draws multiple series of connected line segments. The current position is neither used nor updated by this function.
SetArcDirection	Sets the drawing direction to be used for arc and rectangle functions.

Simple Drawing Functions

Draw3dRect	Draws a three-dimensional rectangle.
DrawDragRect	Erases and redraws a rectangle as it is dragged.
DrawEdge	Draws the edges of a rectangle.
DrawFrameControl	Draw a frame control.
DrawIcon	Draws an icon.
DrawState	Displays an image and applies a visual effect to indicate a state.
FillRect	Fills a given rectangle by using a specific brush.
FillSolidRect	Fills a rectangle with a solid color.
FrameRect	Draws a border around a rectangle.
InvertRect	Inverts the contents of a rectangle.

Ellipse and Polygon Functions

Chord	Draws a chord (a closed figure bounded by the intersection of an ellipse and a line segment).
DrawFocusRect	Draws a rectangle in the style used to indicate focus.
Ellipse	Draws an ellipse.
Pie	Draws a pie-shaped wedge.
Polygon	Draws a polygon consisting of two or more points (vertices) connected by lines.
Polyline	Draws a polygon consisting of a set of line segments connecting specified points.
PolyPolygon	Creates two or more polygons that are filled using the current polygon-filling mode. The polygons may be disjoint or they may overlap.
Rectangle	Draws a rectangle using the current pen and fills it using the current brush.
RoundRect	Draws a rectangle with rounded corners using the current pen and filled using the current brush.

Bitmap Functions

AlphaBlend	Displays bitmaps that have transparent or semitransparent pixels.
BitBlt	Copies a bitmap from a specified device context.
ExtFloodFill	Fills an area with the current brush. Provides more flexibility than the FloodFill member function.
FloodFill	Fills an area with the current brush.
GetPixel	Retrieves the RGB color value of the pixel at the specified point.
GradientFill	Fills rectangle and triangle structures with a gradating color.
MaskBlt	Combines the color data for the source and destination bitmaps using the given mask and raster operation.
PatBlt	Creates a bit pattern.
PlgBlt	Performs a bit-block transfer of the bits of color data from the specified rectangle in the source device context to the specified parallelogram in the given device context.
SetPixel	Sets the pixel at the specified point to the closest approximation of the specified color.
SetPixelV	Sets the pixel at the specified coordinates to the closest approximation of the specified color. SetPixelV is faster than SetPixel because it does not need to return the color value of the point actually painted.
StretchBlt	Moves a bitmap from a source rectangle and device into a destination rectangle, stretching or compressing the bitmap if necessary to fit the dimensions of the destination rectangle.
TransparentBlt	Transfers a bit-block of color data from the specified source device context into a destination device context, rendering a specified color transparent in the transfer.

Text Functions

DrawText	Draws formatted text in the specified rectangle.
DrawTextEx	Draws formatted text in the specified rectangle using additional formats.
ExtTextOut	Writes a character string within a rectangular region using the currently selected font.
GetCharABCWidthsI	Retrieves the widths, in logical units, of consecutive glyph indices in a specified range from the current TrueType font.
GetCharacterPlacement	Retrieves various types of information on a character string.
GetCharWidthI	Retrieves the widths, in logical coordinates, of consecutive glyph indices in a specified range from the current font.
GetOutputTabbedTextExtent	Computes the width and height of a character string on the output device context.
GetOutputTextExtent	Computes the width and height of a line of text on the output device context using the current font to determine the dimensions.
GetOutputTextMetrics	Retrieves the metrics for the current font from the output device context.
GetTabbedTextExtent	Computes the width and height of a character string on the attribute device context.
GetTextAlign	Retrieves the text-alignment flags.
GetTextCharacterExtra	Retrieves the current setting for the amount of intercharacter spacing.
GetTextExtent	Computes the width and height of a line of text on the attribute device context using the current font to determine the dimensions.
GetTextExtentExPointI	Retrieves the number of characters in a specified string that will fit within a specified space and fills an array with the text extent for each of those characters.
GetTextExtentPointI	Retrieves the width and height of the specified array of glyph indices.
GetTextFace	Copies the typeface name of the current font into a buffer as a null-terminated string.
GetTextMetrics	Retrieves the metrics for the current font from the attribute device context.
GrayString	Draws dimmed (grayed) text at the given location.
SetTextAlign	Sets the text-alignment flags.
SetTextCharacterExtra	Sets the amount of intercharacter spacing.
SetTextJustification	Adds space to the break characters in a string.
TabbedTextOut	Writes a character string at a specified location, expanding tabs to the values specified in an array of tab-stop positions.
TextOut	Writes a character string at a specified location using the currently selected font.

Font Functions

GetAspectRatioFilter	Retrieves the setting for the current aspect-ratio filter.
GetCharABCWidths	Retrieves the widths, in logical units, of consecutive characters in a given range from the current font.
GetCharWidth	Retrieves the fractional widths of consecutive characters in a given range from the current font.
GetFontData	Retrieves font metric information from a scalable font file. The information to retrieve is identified by specifying an offset into the font file and the length of the information to return.
GetFontLanguageInfo	Returns information about the currently selected font for the specified display context.
GetGlyphOutline	Retrieves the outline curve or bitmap for an outline character in the current font.
GetKerningPairs	Retrieves the character kerning pairs for the font that is currently selected in the specified device context.
GetOutlineTextMetrics	Retrieves font metric information for TrueType fonts.
GetOutputCharWidth	Retrieves the widths of individual characters in a consecutive group of characters from the current font using the output device context.
SetMapperFlags	Alters the algorithm that the font mapper uses when it maps logical fonts to physical fonts.

Printer Escape Functions

AbortDoc	Terminates the current print job, erasing everything the application has written to the device since the last call of the StartDoc member function.
DrawEscape	Accesses drawing capabilities of a video display that are not directly available through the graphics device interface (GDI).
EndDoc	Ends a print job started by the StartDoc member function.
EndPage	Informs the device driver that a page is ending.
Escape	Allows applications to access facilities that are not directly available from a particular device through GDI. Also allows access to Windows escape functions. Escape calls made by an application are translated and sent to the device driver.
QueryAbort	Calls the AbortProc callback function for a printing application and queries whether the printing should be terminated.
SetAbortProc	Sets a programmer-supplied callback function that Windows calls if a print job must be aborted.
StartDoc	Informs the device driver that a new print job is starting.
StartPage	Informs the device driver that a new page is starting.

Scrolling Functions

ScrollDC

Scrolls a rectangle of bits horizontally and vertically.

Metafile Functions

AddMetaFileComment	Copies the comment from a buffer into a specified enhanced-format metafile.
PlayMetaFile	Plays the contents of the specified metafile on the given device. The enhanced version of PlayMetaFile displays the picture stored in the given enhanced-format metafile. The metafile can be played any number of times.

Path Functions

AbortPath	Closes and discards any paths in the device context.
BeginPath	Opens a path bracket in the device context.
CloseFigure	Closes an open figure in a path.
EndPath	Closes a path bracket and selects the path defined by the bracket into the device context.
FillPath	Closes any open figures in the current path and fills the path's interior by using the current brush and polygon-filling mode.
FlattenPath	Transforms any curves in the path selected into the current device context, and turns each curve into a sequence of lines.
GetMiterLimit	Returns the miter limit for the device context.
GetPath	Retrieves the coordinates defining the endpoints of lines and the control points of curves found in the path that is selected into the device context.
SelectClipPath	Selects the current path as a clipping region for the device context, combining the new region with any existing clipping region by using the specified mode.
SetMiterLimit	Sets the limit for the length of miter joins for the device context.
StrokeAndFillPath	Closes any open figures in a path, strikes the outline of the path by using the current pen, and fills its interior by using the current brush.
StrokePath	Renders the specified path by using the current pen.
WidenPath	Redefines the current path as the area that would be painted if the path were stroked using the pen currently selected into the device context.

Operators

operator HDC

Retrieves the handle of the device context.