CGraphicsDevice Class Reference

#include <gdi.h>

class CGraphicsDevice : public CBase

Inherits from

  • CGraphicsDevice

    Detailed Description

    Specifies the interface for concrete device classes.

    It holds information on the capabilities and attributes of a graphics device. The CBitmapDevice and CPrinterDevice classes are derived from CGraphicsDevice.

    See also: CGraphicsDevice CPrinterDevice

    Member Function Documentation

    CreateContext ( CGraphicsContext *& )

    TInt CreateContext(CGraphicsContext *&aGC)[pure virtual]

    Creates a graphics context for the device.

    ParameterDescription
    aGCOn return, contains a pointer to the created graphics context.

    Returns: KErrNone, if successful; otherwise, another of the system-wide error codes.

    DisplayMode ( )

    TDisplayMode DisplayMode()const [pure virtual]

    Gets the display mode of the device.

    Returns: The display mode of the device.

    FontHeightInTwips ( TInt, TInt )

    TInt FontHeightInTwips(TIntaTypefaceIndex,
    TIntaHeightIndex
    )const [pure virtual]

    Get the height of a font in twips.

    The font is identified by typeface and height.

    The value returned is rounded up or down to the nearest font height in twips.

    ParameterDescription
    aTypefaceIndexAn index identifying the typeface, in the range: 0 to (NumTypefaces() - 1).
    aHeightIndexAn index identifying the font height, in the range: 0 to (iNumHeights - 1). Note that iNumHeights is in the TTypefaceSupport object returned by TypefaceSupport().

    Returns: The height of the font, in twips.

    GetPalette ( CPalette *& )

    TInt GetPalette(CPalette *&aPalette)const [pure virtual]

    Gets the device's current palette.

    This function is only supported if the device has a modifiable palette, which can be determined by calling PaletteAttributes().

    ParameterDescription
    aPaletteOn return, holds the device's current palette.

    Returns: KErrNone, if successful; otherwise, another of the system-wide error codes.

    NumTypefaces ( )

    TInt NumTypefaces()const [pure virtual]

    Gets the number of typefaces supported by the graphics device.

    Returns: The number of typefaces supported.

    PaletteAttributes ( TBool &, TInt & )

    voidPaletteAttributes(TBool &aModifiable,
    TInt &aNumEntries
    )const [pure virtual]

    Gets the palette attributes of the device.

    ParameterDescription
    aModifiableOn return, holds information on whether or not the device's palette is modifiable (ETrue) or fixed (EFalse).
    aNumEntriesOn return, holds the number of entries in the device's palette.

    SetPalette ( CPalette * )

    voidSetPalette(CPalette *aPalette)[pure virtual]

    Sets the device's palette.

    Setting the palette is only possible if the device has a modifiable palette, which can be determined by calling PaletteAttributes().

    ParameterDescription
    aPaletteThe new palette for the device.

    SizeInPixels ( )

    TSize SizeInPixels()const [pure virtual]

    Gets the size of the device area in pixels.

    Returns: The width and height of the device area, in pixels

    SizeInTwips ( )

    TSize SizeInTwips()const [pure virtual]

    Gets the size of the device area in twips.

    Returns: The width and height of the device area, in twips

    TypefaceSupport ( TTypefaceSupport &, TInt )

    voidTypefaceSupport(TTypefaceSupport &aTypefaceSupport,
    TIntaTypefaceIndex
    )const [pure virtual]

    Gets typeface information for a specified typeface.

    This information is returned in aTypefaceSupport, and includes:

    the typeface name and typeface attributes

    the number of font heights

    the maximum and minimum font heights

    whether it is a scalable typeface

    See also: NumTypefaces()

    ParameterDescription
    aTypefaceSupportOn return, contains the typeface information.
    aTypefaceIndexA typeface index number, in the range: zero to (NumTypefaces() - 1).