LBitmapBase::PointFromBitmap

#include "ltwrappr.h"

virtual L_INT LBitmapBase::PointFromBitmap(nViewPerspective, px, py)

L_INT nViewPerspective;

destination view perspective

L_INT * px;

address of the x coordinate variable

L_INT * py;

address of the y coordinate variable

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

Parameter

Description

nViewPerspective

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

LTDIS
LTFIL

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.

See Also

Functions:

LBitmapBase::PointToBitmap, Class Members

Topics:

Accounting for View Perspective

Example

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName 
L_INT LBitmapBase__PointFromBitmapExample() 
{ 
   L_INT nRet; 
   LBitmapBase MyBitmap; 
   L_INT npx=20, npy=30; 
   nRet =MyBitmap.Load(MAKE_IMAGE_PATH(TEXT("image1.cmp")),24); 
   if(nRet !=SUCCESS) 
      return nRet; 
   nRet =MyBitmap.PointFromBitmap(BOTTOM_LEFT, &npx, &npy); 
   if(nRet !=SUCCESS) 
      return nRet; 
   return SUCCESS; 
}

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