﻿ LBitmap::Polar | LBitmap Class Members | Raster imaging C++ Class Library Help
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LBitmap::Polar

#include "ltwrappr.h"

virtual L_INT LBitmap::Polar(crFill, uFlags)

 COLORREF crFill; fill color L_UINT uFlags; flags

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

 Parameter Description 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 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

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

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

 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.

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