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L_RippleBitmap

#include "l_bitmap.h"

L_LTIMGSFX_API L_INT L_RippleBitmap (pBitmap, uAmplitude, uFrequency, nPhase, uAttenuation, CenterPt, crFill, uFlags)

Warps the image in concentric rings.

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle that references the bitmap on which to apply the effect.

L_UINT uAmplitude

Wave magnitude(amount of displacement).

L_UINT uFrequency

Number of repeated waves along the radial line.

L_INT nPhase

Wave phase shift, in hundredths of degrees. The valid range is from -36000 to 36000 (The value in degrees is nPhase divided by 100).

L_UINT uAttenuation

Attenuation value. The attenuation value indicates how rapidly the wave amplitude decays as the wave travels along the radial line. The values range from 0 - 1000.

POINT CenterPt

POINT structure that contains the center of the Ripple wave.

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.

L_UINT uFlags

Flag that indicates how to handle exposed areas. Possible values are:

Value	Meaning
FILL_CLR	[0x0000] Fill any exposed areas with `crFill`.
FILL_RPT	[0x0001] Stretch the image edges to fill the exposed area.
FILL_NOCHG	[0x0002] Leave the exposed area as is, without changing it.

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

This function will warp the image as a series of rings radiating out from the CenterPt. The center point must be defined inside the bitmap or inside the region, if the bitmap has a region.

If the bitmap has a region, the effect will be applied on the region only.

This function supports 12 and 16-bit grayscale and 48 and 64-bit color images. Support for 12 and 16-bit grayscale and 48 and 64-bit color images is available in the Document and Medical Imaging toolkits.

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Required DLLs and Libraries

LTIMGSFX
For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64.

Functions

Topics

Example

L_INT RippleBitmapExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */ 
   POINT CenterPt; 
 
   /* Load a bitmap at its own bits per pixel  */ 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("sample5.cmp")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   /* Ripple bitmap*/ 
   CenterPt.x  =  LeadBitmap.Width/2; 
   CenterPt.y  =  LeadBitmap. Height/2;  
   nRet = L_RippleBitmap (&LeadBitmap, 20, 10, 0, 0, CenterPt, 0, FILL_RPT); 
   if(nRet !=SUCCESS) 
      return nRet; 
   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
   //free bitmap  
   if(LeadBitmap.Flags.Allocated)   
      L_FreeBitmap(&LeadBitmap);   
   return SUCCESS; 
}