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

The POLARDLGPARAMS structure provides information used to initialize the dialog box created by the LDialogImageEffect::DoModalPolar 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 Ignored.
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_SHOW_CONTEXTHELP [0x00000002] dialog should contain a context sensitive help icon.
  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 Ignored.
pHelpCallBackUserData Ignored.
Help Version 20.0.2019.3.11
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LEADTOOLS Common Dialog C++ Class Library Help