L_PointFromBitmap

#include "l_bitmap.h"

L_INT EXT_FUNCTION L_PointFromBitmap(pBitmap, ViewPerspective, px, py)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
L_INT ViewPerspective;	/* destination view perspective */
L_INT L_FAR * px;	/* address of the x coordinate variable */
L_INT L_FAR * py;	/* address of the y coordinate variable */

Translates a point (x,y) from the bitmap's view perspective to the specified view perspective.

Parameter	Description
pBitmap	Pointer to the bitmap handle referencing the bitmap that contains the point.
ViewPerspective	Destination view perspective to which the point should be translated.
px	Address of variable for the X coordinate of the point.
py	Address of variable for the Y coordinate of the point.

Returns

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

Comments

To use this function, do the following:

1.	Declare variables for the X and Y coordinates of a point.
2.	Assign the values of a known point in the bitmap.
3.	Call this function, passing the addresses of the variables, and specifying the destination view perspective. (The function gets the source view perspective from the bitmap handle.)
4.	Get the translated point from the variables, which this function has updated.

For general information about view perspectives, refer to Accounting for View Perspective.

Required DLLs and Libraries

LTKRN

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, Windows CE.

See Also

Functions:	L_PointToBitmap, L_RectFromBitmap, L_RectToBitmap, L_ChangeBitmapViewPerspective, L_RotateBitmapViewPerspective
Topics:	Accounting for View Perspective

Example

/* This example finds out where the origin of the bitmap would be */
/* in a TOP_LEFT90 ViewPerspective */
BITMAPHANDLE LeadBitmap; /* Bitmap handle that holds the bitmap */
L_INT x = 0, y = 0;
L_PointFromBitmap ( &LeadBitmap, TOP_LEFT90, &x, &y );