typedef struct _ZOOMWAVEDLGPARAMS 
   L_UINT uStructSize; 
   pBITMAPHANDLE pBitmap; 
   L_BOOL bZoomToFit; 
   L_UINT uAmplitude; 
   L_UINT uFrequency; 
   L_INT nPhase; 
   L_UINT uZoomFactor; 
   POINT ptCenter; 
   COLORREF crFill; 
   L_UINT uZoomWaveFlags; 
   L_UINT32 uDlgFlags; 
   LTCOMMDLGHELPCB pfnHelpCallback; 
   L_VOID *pHelpCallBackUserData; 

The ZOOMWAVEDLGPARAMS structure provides information used to initialize the dialog box created by the L_DlgZoomWave function. After the user closes the dialog box, this structure is updated with information about the user's selections are returned in this structure.

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)".
uAmplitude Zoom wave magnitude. The value must be greater than zero.
uFrequency The number of repeated waves along the radial line.The value must be greater than zero.
nPhase Wave phase shift. The valid range is from −36000 to 36000.
uZoomFactor The percentage the wave grows as it moves from the image center. The valid range is from 0 to 100.
ptCenter POINT structure that contains the center point from which the wave is zoomed. 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 of undefined area. 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.
uZoomWaveFlags Flags that indicate how exposed areas will be handled. Possible values are:
  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.
uDlgFlags User interface flags for this dialog, which determines the layout and action of the dialog. Possible values are:
  Value Meaning
  DLG_ZOOMWAVE_AUTOPROCESS [0x00000001] process the image on OK. The pBitmap member of this structure should contain a valid bitmap.
  DLG_ZOOMWAVE_SHOW_CONTEXTHELP [0x00000002] dialog should contain a context sensitive help icon.
  DLG_ZOOMWAVE_SHOW_PREVIEW [0x00000004] show a preview of the image in the dialog. The pBitmap member of this structure should contain a valid bitmap.
  DLG_ZOOMWAVE_SHOW_TOOL_ZOOMLEVEL [0x00000008] show the "Zoom to fit" and "Zoom Normal" toolbar buttons. The DLG_ZOOMWAVE_SHOW_PREVIEW flag must be set in order to show these buttons.
  DLG_ZOOMWAVE_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.
Help Version 20.0.2019.3.11
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