POLARDLGPARAMS

typedef struct _POLARDLGPARAMS
{
   L_UINT uStructSize;
   pBITMAPHANDLE pBitmap;
   L_BOOL bZoomToFit;
   COLORREF crFill;
   L_UINT uPolarFlags;
   L_UINT32 uDlgFlags;
   LTCOMMDLGHELPCB pfnHelpCallback;
   L_VOID *pHelpCallBackUserData;
} POLARDLGPARAMS,* LPPOLARDLGPARAMS;

The POLARDLGPARAMS structure provides information used to initialize the dialog box created by the L_DlgPolar function. After the user closes the dialog box, this structure is updated with information about the user's selections.

Member	Description
uStructSize	Size of this structure, in bytes. Use the sizeof operator to calculate this value.
pBitmap	Pointer to the bitmap handle that references the bitmap used for preview or processing.
bZoomToFit	Flag that indicates the initial zoom level for previewing the image. Possible values are:
	Value	Meaning
	TRUE	Set the initial zoom level to "Zoom to fit".
	FALSE	Set the initial zoom level to "Normal (1:1)".

crFill	The COLORREF value that specifies the color used to fill exposed areas. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color.
uPolarFlags	Flags that indicate how exposed areas will be handled and the conversion type. You can use a bitwise OR (\|) to specify one flag from each group. The following are the flags that indicate how to handle exposed areas:
	Value	Meaning
	FILL_CLR	[0x0000] fill exposed areas with the color in crFill.
	FILL_RPT	[0x0001] stretch the edges of the image to fill exposed areas.
	FILL_NOCHANGE	[0x0002] do not change exposed areas.
	The following are the flags that indicate the conversion type:
	Value	Meaning
	CART_TO_POL	[0x0000] convert the image from Cartesian (rectangular) coordinates to polar coordinates.
	POL_TO_CART	[0x0010] convert the image from polar coordinates to Cartesian (rectangular) coordinates.

uDlgFlags	User interface flags for this dialog, which determine the layout and action of the dialog. Possible values are:
	Value	Meaning
	DLG_POLAR_AUTOPROCESS	[0x00000001] process the image on OK. The pBitmap member of this structure should contain a valid bitmap.
	DLG_POLAR_SHOW_CONTEXTHELP	[0x00000002] dialog should contain a context sensitive help icon.
	DLG_POLAR_SHOW_PREVIEW	[0x00000004] show a preview of the image in the dialog. The pBitmap member of this structure should contain a valid bitmap.
	DLG_POLAR_SHOW_TOOL_ZOOMLEVEL	[0x00000008] show the "Zoom to fit" and "Zoom Normal" toolbar buttons. The DLG_POLAR_SHOW_PREVIEW flag must be set in order to show these buttons.
	DLG_POLAR_SHOW_APPLY	[0x00000080] Show the Apply button in the dialog. The dialog will not apply any effect unless the user presses the Apply button.
pfnHelpCallback	Pointer to an optional help callback function. If you do not wish to provide help to this dialog, use NULL as the value of this parameter. To provide help to this dialog, use the function pointer as the value of this parameter. The callback function must adhere to the prototype described in LTCOMMDLGHELPCB.
pHelpCallBackUserData	Void pointer that you can use to pass one or more additional parameters that the callback function needs. To use this feature, assign a value to a variable or create a structure that contains as many fields as you need. Then, in this parameter, pass the address of the variable or structure, casting it to L_VOID *. The callback function, which receives the address in its own pHelpCallBackUserData parameter, can cast it to a pointer of the appropriate data type to access your variable or structure. If the additional parameters are not needed, you can pass NULL in this parameter.