L_ZigZagBitmap

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_ZigZagBitmap(pBitmap, uAmplitude, uAttenuation, uFrequency, nPhase, CenterPt, crFill, uFlags)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
L_UINT uAmplitude;	/* wave's magnitude */
L_UINT uAttenuation;	/* amplitude decay rate */
L_UINT uFrequency;	/* number of repeated waves */
L_INT nPhase;	/* wave phase shift */
POINT CenterPt;	/* effect center */
COLORREF crFill;	/* color value */
L_UINT uFlags;	/* flags */

Radially distorts the bitmap by creating waves that twist the image around a specified center. This function is available in the Raster Pro and above toolkits.

Parameter	Description
pBitmap	Pointer to the bitmap handle that references the bitmap on which to apply the effect.
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.
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.
uFrequency	Number of times the waves repeat along the radial line.
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).
CenterPt	POINT structure that contains the center of the zigzag wave.
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.
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

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

Comments

As an example, if you use the following image:

$image\diffuseglowbefore.gif$

And you call the L_ZigZagBitmap function using the following settings:

Parameter	Value
uAmplitude	47
uAttenuation	92
uFrequency	13
nPhase	-162
CenterPt	(192, 82)
crFill	Black
uFlags	FILL_CLR \| ZG_RAD

The following figure results:

$image\zigzagcenter.gif$

As another settings, if you use the same settings except you use the ZG_POND flag, the following figure results:

$image\zigzagpond.gif$

To create other zigzag forms refer to L_RippleBitmap, L_ZoomWaveBitmap and L_RadWaveBitmap.

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 L_SetStatusCallback.

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.

Required DLLs and Libraries

LTIMG

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

Windows 95 / 98 / Me, Windows 2000 / XP.

See Also

Functions:	L_RippleBitmap, L_ZoomWaveBitmap, L_RadWaveBitmap, L_AddBitmapNoise, L_EmbossBitmap, L_MosaicBitmap, L_MotionBlurBitmap, L_OilifyBitmap, L_PosterizeBitmap, L_RemoveRedeyeBitmap, L_SolarizeBitmap, L_UnderlayBitmap, L_BendingBitmap, L_CylindricalBitmap, L_FreeHandShearBitmap, L_FreeHandWaveBitmap, L_PixelateBitmap, L_ImpressionistBitmap, L_PolarBitmap, L_PunchBitmap, L_RadialBlurBitmap, L_SpherizeBitmap, L_SwirlBitmap, L_WaveBitmap, L_WindBitmap, L_ZoomBlurBitmap, L_BumpMapBitmap, L_CubismBitmap, L_DrawStarBitmap, L_DryBitmap, L_FreePlaneBendBitmap, L_FreeRadBendBitmap, L_GlassEffectBitmap, L_GlowFilterBitmap, L_LensFlareBitmap, L_LightBitmap, L_OceanBitmap, L_PlaneBendBitmap, L_PlaneBitmap, L_SampleTargetBitmap, L_TunnelBitmap
Topics:	Raster Image Functions: Doing Geometric Transformations
	Applying Artistic Effects
	Raster Image Functions: Artistic Effects

Example

BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */
POINT CenterPt;
/* Load a bitmap at its own bits per pixel  */
L_LoadBitmap(TEXT("IMAGE3.CMP"), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
/* Apply ZigZag waves from the center of the image*/
CenterPt.x  =  LeadBitmap.Width/2;
CenterPt.y  =  LeadBitmap. Height/2;
L_ZigZagBitmap(&LeadBitmap, 50, 1000, 10, 0, CenterPt, 0, FILL_RPT | ZG_POND);