Mapping Operations
[GDI functions]

Defines

Functions


Detailed Description

end of draw_adv_2d_fns

The mapping mode defines the unit of measure used to transform page-space units into device-space units, and also defines the orientation of the device's x and y axes.

So far, MiniGUI support only two mapping mode:

The following formula shows the math involved in converting a point from page space to device space:

      Dx = ((Lx - WOx) * VEx / WEx) + VOx

The following variables are involved:

The same equation with y replacing x transforms the y component of a point. The formula first offsets the point from its coordinate origin. This value, no longer biased by the origin, is then scaled into the destination coordinate system by the ratio of the extents. Finally, the scaled value is offset by the destination origin to its final mapping.


Define Documentation

#define GetMapMode ( hdc   )     GetDCAttr (hdc, DC_ATTR_MAP_MODE)

Retrieves the current mapping mode of a DC.

This function retrieves the current mapping mode of the DC hdc.

So far, MiniGUI support two mapping modes: MM_TEXT and MM_ANISOTROPIC.

Parameters:
hdc The device context.
Returns:
The current mapping mode, can be either MM_TEXT or MM_ANISOTROPIC.
See also:
SetWindowExt, SetViewportExt, SetMapMode

Definition at line 4020 of file gdi.h.

#define GetViewportExt ( hdc,
pPt   )     GetDCLCS(hdc, DC_LCS_VEXT, pPt)

Retrieves the x-extents and y-extents of the current viewport for a device context.

This function retrieves the x-extents and y-extens of the current viewport of the specified device context hdc.

Parameters:
hdc The device context.
pPt The viewport extents will be returned through this buffer.
See also:
GetMapMode, SetViewportExt

Definition at line 4126 of file gdi.h.

#define GetViewportOrg ( hdc,
pPt   )     GetDCLCS(hdc, DC_LCS_VORG, pPt)

Retrieves the x-coordinates and y-coordinates of the viewport origin for a device context.

This function retrieves the x-coordinates and y-coordinates of the viewport origin of the specified device context hdc.

Parameters:
hdc The device context.
pPt The viewport origin will be returned through this buffer.
See also:
GetMapMode, SetViewportOrg

Definition at line 4111 of file gdi.h.

#define GetWindowExt ( hdc,
pPt   )     GetDCLCS(hdc, DC_LCS_WEXT, pPt)

Retrieves the x-extents and y-extents of the current window for a device context.

This function retrieves the x-extents and y-extens of the current window of the specified device context hdc.

Parameters:
hdc The device context.
pPt The window extents will be returned through this buffer.
See also:
GetMapMode, SetWindowExt

Definition at line 4156 of file gdi.h.

#define GetWindowOrg ( hdc,
pPt   )     GetDCLCS(hdc, DC_LCS_WORG, pPt)

Retrieves the x-coordinates and y-coordinates of the window for a device context.

This function retrieves the x-coordinates and y-coordinates of the window origin of the specified device context hdc.

Parameters:
hdc The device context.
pPt The window origin will be returned through this buffer.
See also:
GetMapMode, SetWindowOrg

Definition at line 4141 of file gdi.h.

#define SetMapMode ( hdc,
mapmode   )     SetDCAttr (hdc, DC_ATTR_MAP_MODE, (DWORD)mapmode)

Sets the mapping mode of a display context.

This function sets the mapping mode of the specified display context hdc.

So far, MiniGUI support two mapping modes: MM_TEXT and MM_ANISOTROPIC.

Parameters:
hdc The device context.
mapmode The new mapping mode, should be either MM_TEXT or MM_ANISOTROPIC.
Returns:
The old mapping mode, either MM_TEXT or MM_ANISOTROPIC.
See also:
SetWindowExt, SetViewportExt, SetMapMode

Definition at line 4037 of file gdi.h.

#define SetViewportExt ( hdc,
pPt   )     SetDCLCS(hdc, DC_LCS_VEXT, pPt)

Sets the x-extents and y-extents of the current viewport for a device context.

This function sets the x-extents and y-extens of the current viewport of the specified device context hdc.

Parameters:
hdc The device context.
pPt The viewport extents will be set.
See also:
GetMapMode, GetViewportExt

Definition at line 4186 of file gdi.h.

#define SetViewportOrg ( hdc,
pPt   )     SetDCLCS(hdc, DC_LCS_VORG, pPt)

Sets the x-coordinates and y-coordinates of the viewport origin for a device context.

This function sets the x-coordinates and y-coordinates of the viewport origin of the specified device context hdc.

Parameters:
hdc The device context.
pPt The viewport origin will be set.
See also:
GetMapMode, GetViewportOrg

Definition at line 4171 of file gdi.h.

#define SetWindowExt ( hdc,
pPt   )     SetDCLCS(hdc, DC_LCS_WEXT, pPt)

Sets the x-extents and y-extents of the current window for a device context.

This function sets the x-extents and y-extens of the current window of the specified device context hdc.

Parameters:
hdc The device context.
pPt The window extents will be set.
See also:
GetMapMode, GetWindowExt

Definition at line 4216 of file gdi.h.

#define SetWindowOrg ( hdc,
pPt   )     SetDCLCS(hdc, DC_LCS_WORG, pPt)

Sets the x-coordinates and y-coordinates of the window for a device context.

This function sets the x-coordinates and y-coordinates of the window origin of the specified device context hdc.

Parameters:
hdc The device context.
pPt The window origin will be set.
See also:
GetMapMode, GetWindowOrg

Definition at line 4201 of file gdi.h.


Function Documentation

void GUIAPI DPtoLP ( HDC  hdc,
POINT pPt 
)

Converts device coordinates into logical coordinates.

This function converts device coordinates into logical coordinates in the device context hdc.

The conversion depends on the mapping mode of the display context, the settings of the origins and extents for the window and viewport. The x-coordinate and y-coordinate contained in struct pPt will be transformed.

Parameters:
hdc The device context.
pPt The coordinates to be converted, and the transformed coordinates will be contained in this buffer after the function returns.
See also:
LPtoDP
void GUIAPI GetDCLCS ( HDC  hdc,
int  which,
POINT pt 
)

Retrieves mapping parameters of a device context.

This function retrieves mapping paramters of the specified device context hdc when the mapping mode is not MM_TEXT.

Parameters:
hdc The device context.
which Which parameter you want to retrieve, can be one of the following values:
  • DC_LCS_VORG
    Retrieves the x-coordinates and y-coordinates of the viewport origin.
  • DC_LCS_VEXT
    Retrieves the x-extents and y-extents of the current viewport.
  • DC_LCS_WORG
    Retrieves the x-coordinates and y-coordinates of the window origin.
  • DC_LCS_WEXT
    Retrieves the x-extents and y-extents of the window.
Parameters:
pt The coordinates or extents will be returned through this buffer.
See also:
GetMapMode, SetMapMode, SetDCLCS
void GUIAPI LPtoDP ( HDC  hdc,
POINT pPt 
)

Converts logical coordinates into device coordinates.

This function converts logical coordinates into device coordinates in the device context hdc.

The conversion depends on the mapping mode of the display context, the settings of the origins and extents for the window and viewport. The x-coordinate and y-coordinate contained in struct pPt will be transformed.

Parameters:
hdc The device context.
pPt The coordinates to be converted, and the transformed coordinates will be contained in this buffer after the function returns.
See also:
DPtoLP
void GUIAPI LPtoSP ( HDC  hdc,
POINT pPt 
)

Converts logical coordinates into screen coordinates.

This function converts logical coordinates into screen coordinates in the device context hdc.

The conversion depends on the mapping mode of the display context, the settings of the origins and extents for the window and viewport. The x-coordinate and y-coordinate contained in struct pPt will be transformed.

Parameters:
hdc The device context.
pPt The coordinates to be converted, and the transformed coordinates will be contained in this buffer after the function returns.
See also:
SPtoLP
void GUIAPI SetDCLCS ( HDC  hdc,
int  which,
const POINT pt 
)

Sets mapping parameters of a device context.

This function sets mapping paramters of the specified device context hdc when the mapping mode is not MM_TEXT.

Parameters:
hdc The device context.
which Which parameter you want to retrieve, can be one of the following values:
  • DC_LCS_VORG
    Sets the x-coordinates and y-coordinates of the viewport origin.
  • DC_LCS_VEXT
    Sets the x-extents and y-extents of the current viewport.
  • DC_LCS_WORG
    Sets the x-coordinates and y-coordinates of the window origin.
  • DC_LCS_WEXT
    Sets the x-extents and y-extents of the window.
Parameters:
pt The coordinates or extents will be set.
See also:
GetMapMode, SetMapMode, GetDCLCS
void GUIAPI SPtoLP ( HDC  hdc,
POINT pPt 
)

Converts screen coordinates into logical coordinates.

This function converts screen coordinates into logical coordinates in the device context hdc.

The conversion depends on the mapping mode of the display context, the settings of the origins and extents for the window and viewport. The x-coordinate and y-coordinate contained in struct pPt will be transformed.

Parameters:
hdc The device context.
pPt The coordinates to be converted, and the transformed coordinates will be contained in this buffer after the function returns.
See also:
LPtoSP
Generated on Thu Apr 7 15:58:38 2011 for MiniGUI V3.0.12 API Reference by  doxygen 1.6.3