TOUCH_COORD_TO_PIXEL macro (winuser.h)

Converts touch coordinates to pixels.

Syntax

void TOUCH_COORD_TO_PIXEL(
   l
);

Parameters

l

The value to be converted from touch coordinates to pixels.

Return value

None

Remarks

The TOUCH_COORD_TO_PIXEL macro is used to convert from touch coordinates (currently centipixels) to pixels. Touch coordinates are finer grained than pixels so that application developers can use subpixel granularity for specialized applications such as graphic design.

Examples

case WM_TOUCH:        
  cInputs = LOWORD(wParam);
  pInputs = new TOUCHINPUT[cInputs];
  if (pInputs){
    if (GetTouchInputInfo((HTOUCHINPUT)lParam, cInputs, pInputs, sizeof(TOUCHINPUT))){
      for (int i=0; i < static_cast<INT>(cInputs); i++){
        TOUCHINPUT ti = pInputs[i];
        index = GetContactIndex(ti.dwID);
        if (ti.dwID != 0 && index < MAXPOINTS){                            
          // Do something with your touch input handle
          ptInput.x = TOUCH_COORD_TO_PIXEL(ti.x);
          ptInput.y = TOUCH_COORD_TO_PIXEL(ti.y);
          ScreenToClient(hWnd, &ptInput);
          
          if (ti.dwFlags & TOUCHEVENTF_UP){                      
            points[index][0] = -1;
            points[index][1] = -1;                
          }else{
            points[index][0] = ptInput.x;
            points[index][1] = ptInput.y;                
          }
        }
      }
    }
    // If you handled the message and don't want anything else done with it, you can close it
    CloseTouchInputHandle((HTOUCHINPUT)lParam);
    delete [] pInputs;
  }else{
    // Handle the error here 
  }  

Requirements

   
Minimum supported client Windows 7 [desktop apps only]
Minimum supported server Windows Server 2008 R2 [desktop apps only]
Target Platform Windows
Header winuser.h (include Windows.h)

See also

Macros