IKWhirlPinch

This function produces an interesting effect similar to pinching a raster image then twisting your fingers.

[C++Builder] HANDLE IKWhirlPinch(PTR_IKSELECT_IMAGE SrcHandle, BYTE SelectMode, LPPOINT lpPoint, int Points, LPRECT Rect, BOOL InOut, double Whirl, double Pinch, double Radius, BYTE Red, BYTE Green, BYTE Blue, IKPROCESSPROC UserProc, LPCTSTR Caption, LPCTSTR Message, LPCTSTR Button);

[Delphi] function IKWhirlPinch(var SrcHandle: IKSELECT_IMAGE; SelectMode: Byte; var lpPoint: TPoint; Points: Integer; var Rect : TRect; InOut: LongBool; Whirl, Pinch, Radius: Double; Red, Green, Blue: Byte; UserProc: LONG_PTR; Caption, Message, Button: PChar): THandle;

Parameters

Name	Explanation
SrcHandle	A structure containing the image handle and the mask image handle member variables hImgBmh can be 8bit grayscale, 16, 24, or 32 bit images
SelectMode	Sets the method for selecting the area on the image that will be processed (0: Mask handle, 1: Total image, 2: Polygon, 3: Ellipse)
lpPoint	A structure defining coordinates for the points of the polygonal area on the image. (This parameter is enabled when SelectMode is 2) In C++Builder, pass the pointer to the first element in the structure array. In Delphi, if Pt is an array of TPoint, then the arguments are returned in the first elements of the array Pt[0]
Points	The number of points defining the polygonal area on the image, i.e. the number of points in the lpPoint array (This parameter is enabled when SelectMode is 2).
Rect	A structure specifying the coordinates for the rectangle bounding the elliptical area on the image (This parameter is enabled when SelectMode is 3)
InOut	Determines whether the area inside the selected area will be processed or the area outside the selected area will be processed. Enabled for polygon and ellipse (SelectMode is 2 or 3). If False (0), the area outside the selected area is processed. If True (nonzero) the area inside the selected area is processed.
Whirl	Sets the number of degrees of the twisting effect
Pinch	Sets the "strength" of the pinch
Radius	Sets the size of the area affected by the twisting effect (more than 0)
Red	The red component of the background color (from 0 to 255)
Green	The green component of the background color (from 0 to 255)
Blue	The blue component of the background color (from 0 to 255)
UserProc	The address of the user function (If not using the user function then set to 0)
Caption	Sets the text displayed in the title bar of the progress dialog box
Message	Sets the message displayed in the progress dialog box
Button	Sets the name of the button displayed in the progress dialog box

Return Value

Returns the raster image handle if successful. Returns 0 if unsuccessful.

Explanation

The IKWhirlPinch function produces an interesting effect similar to pinching a raster image then twisting your fingers. The Whirl parameter sets the number of degrees of the twisting effect. A value of 360 would mean that the twisting effect makes one complete revolution. The Radius parameter sets the size of the twisting effect on the image. As the Radius parameter increases in size, it affects larger areas on the image. Values of 2 or more could mean the the radius of the twisting effect is larger than the image itself. In this case the background color is used to fill any spaces that are outside of the orginal image. It is recommended that you set a Radius value of less than 1 so that the area affected remains within the image, then experiment with the Whirl parameter to get the desired effect. The Pinch parameter does exactly that, it pinches the area in the center of the twisting effect. A Pinch parameter of 1 will bring all of the colors together in the center. Values greater than 1 can "tear" the image in which case the background color is painted in the center.

Before executing this function, you must set the area on the image that will be affected. There are 4 ways to do this.

To use a mask image, set SelectMode to 0. Then set the mask image handle in SrcHandle.
To process the total image, set SelectMode to 1.
To process the polygonal area on the image, set SelectMode to 2. Select the polygon by setting the appropriate coordinate values for the points of the polygon in the lpPoint structure. Then set the number of points defining the polygon in Points (must be 3 or more).
To process an elliptical area on the image, set SelectMode to 3. Select the ellipse by setting the appropriate values for the bounding rectangle in the Rect structure.

For the lpPoint and Rect structure members, coordinate points are in pixel units. When SelectMode is set to a value other than 2, set a dummy array in lpPoint and set Points to 0. When SelectMode is set to a value other than 3, then set a dummy array in Rect. When the Edges parameter is 0 the Red, Green and Blue parameters are enabled.

Note: the image handles passed to IKSELECT_IMAGE are NOT automatically freed after executing this function.

If the user function is set or if the Caption, Message, and Button parameters are blank then the Progress dialog box is not displayed. If the Progress dialog box is displayed, it indicates the percentage of the current process completed. For more information about the user function please refer to the Definition of User Function in the Ik10Effect.dll, Ik10EffectA.dll, Ik10Effect64.dll, Ik10Effect64A.dlll section.