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L_PointFromBitmap

Summary

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

Syntax

#include "l_bitmap.h"

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

Parameters

pBITMAPHANDLE pBitmap

Pointer to the bitmap handle referencing the bitmap that contains the point.

L_INT ViewPerspective

Destination view perspective to which the point should be translated.

L_INT* px

Address of variable for the X coordinate of the point.

L_INT* py

Address of variable for the Y coordinate of the point.

Returns

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

Comments

To use this function, do the following:

Declare variables for the X and Y coordinates of a point.
Assign the values of a known point in the bitmap.
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.)
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

Win32, x64, Linux.

Example

This example finds out where the origin of the bitmap would be in a TOP_LEFT90 ViewPerspective

L_INT PointFromBitmapExample(pBITMAPHANDLE   LeadBitmap, 
                                             L_INT*         nX, 
                                             L_INT*         nY) 
{ 
   L_INT nRet; 
   nRet = L_PointFromBitmap ( LeadBitmap, TOP_LEFT90, nX, nY ); 
   if(nRet != SUCCESS) 
      return nRet; 
   return SUCCESS; 
}