GDI: ArcTo Function

[José Roca]

 
The following example illustrates the use of the ArcTo function.

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' ########################################################################################
' The following example illustrates the use of the ArcTo function.
' ########################################################################################

' CSED_PBWIN - Use the PBWIN compiler
#COMPILE EXE
#DIM ALL
%UNICODE = 1

' // Include files for external files
#INCLUDE ONCE "CWindow.inc"   ' // CWindow class

' ========================================================================================
' Main
' ========================================================================================
FUNCTION WinMain (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS WSTRINGZ PTR, BYVAL nCmdShow AS LONG) AS LONG

   ' // Create an instance of the class
   LOCAL pWindow AS IWindow
   pWindow = CLASS "CWindow"
   IF ISNOTHING(pWindow) THEN EXIT FUNCTION

   ' // Create the main window
   ' // Note: CW_USEDEFAULT is used as the default value When passing 0's as the width and height
   pWindow.CreateWindow(%NULL, "ArcTo Demo", 0, 0, 0, 0, 0, 0, CODEPTR(WindowProc))
   ' // Change the background color
   pWindow.Brush = %COLOR_WINDOW + 1
   ' // Set the client size
   pWindow.SetClientSize 500, 320
   ' // Center the window
   pWindow.CenterWindow

   ' // Default message pump (you can replace it with your own)
   pWindow.DoEvents(nCmdShow)

END FUNCTION
' ========================================================================================

' ========================================================================================
' Main window procedure
' ========================================================================================
FUNCTION WindowProc (BYVAL hwnd AS DWORD, BYVAL wMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG

   LOCAL rc AS RECT
   LOCAL hDC AS DWORD
   LOCAL ps AS PAINTSTRUCT

   SELECT CASE wMsg

      CASE %WM_COMMAND
         SELECT CASE LO(WORD, wParam)

            CASE %IDCANCEL
               IF HI(WORD, wParam) = %BN_CLICKED THEN
                  SendMessage hwnd, %WM_CLOSE, 0, 0
                  FUNCTION = 0
                  EXIT FUNCTION
               END IF

         END SELECT

      CASE %WM_PAINT
         hDC = BeginPaint(hWnd, ps)
'         IF GetArcDirection(hDC) = %AD_CLOCKWISE THEN
'            SetArcDirection hDC, AD_COUNTERCLOCKWISE
'         END IF
         SetArcDirection hDC, %AD_COUNTERCLOCKWISE
         ArcTo hDC, 20, 20, 50, 60, 50, 60, 20, 60
         EndPaint(hWnd, ps)

      CASE %WM_DESTROY
         PostQuitMessage 0
         EXIT FUNCTION

   END SELECT

   FUNCTION = DefWindowProc(hwnd, wMsg, wParam, lParam)

END FUNCTION
' ========================================================================================