Help Version 19.0.2017.10.27
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#include "l_bitmap.h"
L_LTIVW_API L_INT EXT_FUNCTION L_DispContainerGetBitmapPixel(hCellWnd, nSubCellIndex, pSrcPoint, pBitmapPoint, uFlags)
L_HWND hCellWnd; |
handle to the cell window |
L_INT nSubCellIndex; |
index into the image list attached to the cell |
LPPOINT pSrcPoint; |
pointer to a POINT structure |
LPPOINT pBitmapPoint; |
address of the POINT structure to be updated |
L_UINT uFlags; |
reserved for future |
Gets the bitmap pixel associated with the specified position.
Parameter |
Description |
hCellWnd |
A handle to the window that represents the cell on which the function's effect will be applied. |
nSubCellIndex |
A zero-based index into the image list attached to the cell specified in nCellIndex. This sub-cell contains the image that contains the bitmap. Pass -2 to refer to the selected sub-cell. |
pSrcPoint |
Pointer to the POINT structure that specifies the point to get the corresponding bitmap coordinates. Coordinates are relative to the associated cell area. |
pBitmapPoint |
Pointer to the POINT structure that provides the corresponding bitmap coordinates to the specified point pSrcPoint. |
uFlags |
Reserved for future use. Pass 0. |
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
If the user passes coordinates that falls outside the valid bitmap coordinates range, pBitmapPoint will return {-1, -1}.
Required DLLs and Libraries
LTIVW |
this example draw dots on the image when clicking on it using the left mouse button.
static L_INT EXT_CALLBACK MouseCallBack(HWND hCellWnd,L_UINT uMessage,pDISPCONTAINERCELLINFO pCellInfo,L_VOID * pUserData){UNREFERENCED_PARAMETER(pCellInfo);HDISPCONTAINER hCon = (HDISPCONTAINER)pUserData;POINT ptBitmapPoint;BITMAPHANDLE Bitmap;L_INT nCellIndex = pCellInfo->nCellIndex;hCellWnd = L_DispContainerGetCellWindowHandle(hCon, nCellIndex, 0);switch(uMessage){case WM_LBUTTONDOWN:{POINT ptPoint = {pCellInfo->nX, pCellInfo->nY};L_DispContainerGetBitmapPixel(hCellWnd, pCellInfo->nSubCellIndex, &ptPoint, &ptBitmapPoint, 0);L_DispContainerGetBitmapHandle(hCellWnd, pCellInfo->nSubCellIndex, &Bitmap, 0);L_PutPixelColor(&Bitmap, ptBitmapPoint.y, ptBitmapPoint.x, RGB(255, 255, 255));L_DispContainerSetBitmapHandle(hCellWnd, pCellInfo->nSubCellIndex, &Bitmap, TRUE, 0);}break;}return SUCCESS;}L_INT DispContainerGetBitmapPixel(HDISPCONTAINER hCon){DISPCONTAINERMOUSECALLBACK oldCallBack;L_VOID * pOldUserData;if (L_DispContainerGetCellCount(hCon, 0) == 0){MessageBox(NULL, TEXT("you must at least have one cell added to the viewer"), TEXT("No Cell attached"), MB_OK);return FAILURE;}HWND hCellWnd = L_DispContainerGetCellWindowHandle(hCon, 0, 0);L_DispContainerGetMouseCallBack(hCellWnd, &oldCallBack, &pOldUserData);L_DispContainerSetMouseCallBack(hCellWnd, MouseCallBack, hCon);return SUCCESS;}