3/3/2023 0 Comments Couplete app for macIf you use the BeginPaint() /EndPaint() couplet to open and close WM_PAINT message processing, it s very difficult to control the erasure phase of painting. ![]() All this brings us to the point at which we can examine why there was so much fuss about valid and invalid rectangles. ![]() Finally, we call Polyline and draw the line, update bDrawingLines, validate the rectangle in which we drew the line segment, and clean up with a call to EndPaint(). If you reverse the order of the first two parameters, then MapWindowPoints() converts application window coordinates to screen coordinates. The constant HWND_DESKTOP used as the first parameter signifies that we are passing screen coordinates to this function and we want them translated to the coordinate space that belongs to the window identified by the second parameter. The parameters, in the order shown, are the constant HWND_DESKTOP, the handle to our main application window, the address of the array of points to convert, and a count of points in the array.
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