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AnswerRe: Check if .exe-file, WITH A PATH(!!!), is running, from within a bat-file? Pin
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Gregorio Pollich19-Feb-21 2:51
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QuestionGDI drawing Pin
David Crow7-Jan-21 10:24
MemberDavid Crow7-Jan-21 10:24 
In playing around with some basic GDI stuff, I had the need to draw an object in the middle of the main window and then when a button is clicked, draw that object progressively closer to some corner (in my code below, the object moves to the lower right corner, but ultimately I'd like it to move to any corner). So my question is: how to calculate those new X/Y coordinates with each button click?

The initial X/Y coordinates are calculated in response to WM_SIZE like:
case WM_SIZE:
    nScreenWidth  = LOWORD(lParam);
    nScreenHeight = HIWORD(lParam);

    // the window is not being resized right now, so these two variables aren't being recalculated.
    nX = (nScreenWidth - nObjectWidth) / 2;
    nY = (nScreenHeight - nObjectHeight) / 2;

    break;
When the button is clicked, new X/Y coordinates are "calculated" like:
case WM_COMMAND:
    if (LOWORD(wParam) == ID_BUTTON)  
    {
        nX += 20;
        nY += 10;
        InvalidateRect(hWnd, NULL, TRUE);
    }
    break;
The object is drawn in response to WM_PAINT like:
case WM_PAINT:
    {
        PAINTSTRUCT ps;
        HDC hdc = BeginPaint(hWnd, &ps);

        // draw object at nX, nY

        EndPaint(hWnd, &ps);
    }
    break;
You can count on one hand how many GDI projects I've done in the past (and have fingers left over) so I'm walking in somewhat uncharted territory for me. As a visual aide, if you envision a straight line drawn from the middle of the screen to one of its corners, each pixel of that line is on an X/Y coordinate. What would that calculation look like?

Thank you.
DC

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modified 11-Jan-21 15:00pm.

AnswerRe: GDI drawing Pin
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