LBitmap::ZigZag

Summary

Radially distorts the bitmap by creating waves that twist the image around a specified center.

Syntax

#include "ltwrappr.h"

L_INT LBitmap::ZigZag(uAmplitude, uAttenuation, uFrequency, nPhase, CenterPt, crFill, uFlags)

Parameters

L_UINT uAmplitude

Non-zero value that represents the magnitude of the wave (amount of displacement), if ZG_RAD is set in the uFlags parameter. The valid range is from 1 - 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 valid range is from 0 - 1000.

L_UINT uFrequency

Number of times the waves repeat 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).

POINT CenterPt

POINT structure that contains the center of the zigzag wave.

COLORREF 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.

L_UINT uFlags

Flags that indicate how to handle exposed areas, and the wave radiation 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 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.

The following are the flags that indicate the wave radiation type:

Value	Meaning
ZG_RAD	[0x0000] Create distortion waves around the CenterPt.
ZG_POND	[0x0010] Create distortion waves that resemble the ripples in a pond.

Returns

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

Comments

For an example, click here

To create other zigzag forms refer to LBitmap::Ripple, LBitmap::ZoomWave and LBitmap::RadWave.

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 only in the Document/Medical toolkits.

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

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 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.

ZigZag Function - Before

ZigZag Function - After

View additional platform support for this ZigZag 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.

Example

Apply ZigZag waves from the center of the image

L_INT LBitmap__ZigZagExample(LBitmapWindow m_LBitmapWnd) 
{ 
   L_INT nRet; 
   POINT CenterPt; 
   LBitmap LeadBitmap; 
   CenterPt.x  =  m_LBitmapWnd.GetWidth()/2; 
   CenterPt.y  =  m_LBitmapWnd.GetHeight()/2; 
    
   nRet = LeadBitmap.Load(MAKE_IMAGE_PATH(TEXT("sample5.cmp")), 0,ORDER_BGR); 
   if(nRet != SUCCESS) 
      return nRet; 
   nRet = LeadBitmap.ZigZag(50, 1000, 10, 0, CenterPt, 0, FILL_RPT | ZG_POND); 
   if(nRet != SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
}