L_PointToBitmap
#include "l_bitmap.h"
L_INT EXT_FUNCTION L_PointToBitmap(pBitmap, ViewPerspective, px, py)
pBITMAPHANDLE pBitmap; |
/* pointer to the bitmap handle */ |
L_INT ViewPerspective; |
/* source view perspective */ |
/* address of the x coordinate variable */ | |
/* address of the y coordinate variable */ |
Translates a point (x,y) from the specified view perspective to the bitmap's view perspective.
Parameter |
Description |
pBitmap |
Pointer to the bitmap handle referencing the target bitmap. |
ViewPerspective |
Source view perspective from 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 using the coordinates of the source view perspective. |
3. |
Call this function, passing the addresses of the variables, and specifying the source view perspective. (The function gets the destination 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_PointFromBitmap, L_RectFromBitmap, L_RectToBitmap, L_ChangeBitmapViewPerspective, L_RotateBitmapViewPerspective |
Topics: |
Example
/* This example finds out where a point in the TOP_LEFT90 ViewPerspective */
/* actually is in the bitmap */
BITMAPHANDLE LeadBitmap;
L_INT x = 0, y = 0;
L_PointToBitmap ( &LeadBitmap, TOP_LEFT90, &x, &y );