LBitmap::Polar

#include "ltwrappr.h"

virtual L_INT LBitmap::Polar(crFill, uFlags)

Converts the bitmap from rectangular to polar coordinates and vice versa.

Parameters

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 type of conversion. 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 conversion type:

Value Meaning
CART_TO_POL [0x0000] Convert the image from Cartesian (rectangular) coordinates to polar coordinates.
POL_TO_CART [0x0010] Convert the image from polar coordinates to Cartesian (rectangular) coordinates.

Returns

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

Comments

This function converts a bitmap from Cartesian (rectangular) coordinates to polar coordinates or vice versa. Rectangular coordinates use the form (x, y) where x and y are the horizontal and vertical distances from the origin, respectively. Polar coordinates are in the form (r, ) where r is the distance from the origin to the point and Ȓ is the angle of the line the point makes with the positive x-axis. Polar coordinates use a grid made of concentric circles around the origin, along with lines that are rays radiating outward from the origin.

If CART_TO_POL is set, this function considers the positions of the images pixels as values in a Polar coordinate system. Then it converts all the pixels in a line of the source image into a circle around the center of the bitmap.

If POL_TO_CART is set, this function takes the pixels from concentric circles and considers their positions as values in a Cartesian coordinate system. Then it converts all the pixels in a circle into horizontal lines.

If there is any region selected on the bitmap, the effect will be applied on the region dimensions 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.

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.

Required DLLs and Libraries

Platforms

Win32, x64.

See Also

Functions

Topics

Example

L_INT LBitmap__PolarExample(LAnimationWindow * LAniWnd)  
{ 
 
   return LAniWnd->Polar(0, FILL_RPT | CART_TO_POL);  
 
} 
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