Zooming In on a Selection: Step 5 (original) (raw)

In the MainWndProc function, add code to process WM_MOUSEMOVE messages. This code outlines the selection using GDI functions . The code should appear as follows:

case WM_MOUSEMOVE: /* Use GDI functions to outline the area to be cropped. */ if (wParam == MK_LBUTTON) { ThisWindowDC = GetDC(hWnd); SavedPen = SelectObject(ThisWindowDC, GetStockObject(WHITE_PEN)); SavedBrush = SelectObject(ThisWindowDC, GetStockObject(NULL_BRUSH)); DisplayMode = GetROP2(ThisWindowDC); SetROP2(ThisWindowDC, R2_NOT); if (FirstDraw == FALSE) Rectangle(ThisWindowDC, StartGDIX, StartGDIY, EndGDIX, EndGDIY); EndGDIX = LOWORD(lParam); EndGDIY = HIWORD(lParam); Rectangle(ThisWindowDC, StartGDIX, StartGDIY, EndGDIX, EndGDIY); FirstDraw = FALSE; SetROP2(ThisWindowDC, DisplayMode); } return (0);

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