typedef struct _PUNCHDLGPARAMS 
   L_UINT uStructSize; 
   pBITMAPHANDLE pBitmap; 
   L_BOOL bZoomToFit; 
   L_UINT uStress; 
   L_INT nValue; 
   POINT ptCenter; 
   COLORREF crFill; 
   L_UINT uPunchFlags; 
   L_UINT32 uDlgFlags; 
   LTCOMMDLGHELPCB pfnHelpCallback; 
   L_VOID  *pHelpCallBackUserData; 

The PUNCHDLGPARAMS structure provides information used to initialize the dialog box created by the LDialogImageEffect::DoModalPunch 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)".
uStress Amount of punching intensity. This value is ignored when nValue is less than 0. Valid values range from 0 to 1000.
nValue Amount of stretching, where positive values pinch the image toward its center and negative values expand the image away from its center. Valid values range from −500 to 500.
ptCenter POINT structure that contains the point around which the image will be pinched or punched. The center point must be defined inside the bitmap or inside the region, if the bitmap has a region.
crFill The COLORREF value that specifies the fill color for any 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.
uPunchFlags Flags that indicate how to handle exposed areas, both centrally and peripherally. You can use a bitwise OR (|) to specify one flag from each group. This flag is ignored if the nValue is positive. The following are the flags that indicate how to handle peripherally 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_NOCHG [0x0002] do not change or process exposed areas.
  The following are the flags that indicate how to handle centrally exposed areas:
  Value Meaning
  FILL_ROT [0x0000] Rotate the image inside the pinch pattern.
  FILL_WOUTROT [0x0010] Fill the exposed center the same way the peripherally exposed areas are filled.
uDlgFlags User interface flags for this dialog, which determine the layout and action of the dialog. Possible values are:
  Value Meaning
  DLG_PUNCH_SHOW_CONTEXTHELP [0x00000002] dialog should contain a context sensitive help icon.
  DLG_PUNCH_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