drawing square net in SDI MFC

Question

how can i draw square net ( like chess) in SDI MFC ? and how to determine the position for putting some more shape in specific position ? i have to use (Moveto) and (Lineto) and draw them 1 by 1 ? or using bitmap ? or easier way ? i tried in this way but it's not really smart. thank you.

COLORREF blueline = RGB(255, 0, 0);
    pen1.CreatePen(PS_SOLID, 3, blueline);
    pDC->SelectObject(&pen1);
    pDC->MoveTo(0,80);
    pDC->LineTo(1024, 80);
    pDC->SelectObject(&pen1);

Have a look here: https://msdn.microsoft.com/en-gb/library/windows/hardware/cc308997(v=vs.90).aspx. You use the **CMemDC** class. This is good if you want to reduce flickering. — Andrew Truckle, Jun 23 '16 at 12:08
@AndrewTruckle: All supported versions of Windows implement double-buffering already, as is. There hardly ever is a need to render to a memory device context. — IInspectable, Jun 23 '16 at 12:14
@IInspectable I was not aware that MFC did these days. That is why I used the CMemDC and blip to screen automatically. — Andrew Truckle, Jun 23 '16 at 12:16
@AndrewTruckle: This has nothing to do with MFC. MFC merely provides wrappers around standard Windows controls and windows. Those are double-buffered by default in the Desktop Window Manager (DWM). — IInspectable, Jun 23 '16 at 12:26
@IInspectable But I have been taught that at times you may still do your painting in the background and then render it. Maybe not needed for this scenario. Thanks for clarification though. — Andrew Truckle, Jun 23 '16 at 12:33

IInspectable · Accepted Answer · 2016-06-23T12:23:20.447

1

You can draw solid rectangles by calling CDC::FillSolidRect. If your rectangles should contain a more complex pattern, use CDC::FillRect instead.

You can render a checkered board using the following pseudo-code:

for (int x = 0; x < 8; ++x) {
    for (int y = 0; y < 8; ++y ) {
        // Calculate square position and size
        int x0 = x_origin + x * square_width;
        int x1 = x_origin + (x + 1) * square_width;
        int y0 = y_origin + y * square_height;
        int y1 = y_origin + (y + 1) * square_height;
        RECT r = {x0, y0, x1, y1};
        // Pick alternating color
        COLORREF color = (x + y) & 1 ? RGB(0, 0, 0) : RGB(255, 255, 255);
        // Render square
        pDC->FillSolidRect(&r, color);
    }
}

edited Jun 23 '16 at 12:23

answered Jun 22 '16 at 14:35

IInspectable

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@Emadsharifmohseny: Since that is what you asked for, I don't see why you are surprised. Those are the ingredients for a checkered chess board. If that is not fancy enough, I also linked to an API that can fill rectangles with arbitrarily complex patterns. – IInspectable Jun 23 '16 at 11:09
@IInspectable I think he is asking how to construct the "Net" itself of "Squares". – Andrew Truckle Jun 23 '16 at 12:10
i am trying to make net , not just hatches – Emad mohseny Jun 23 '16 at 12:19
i think you didnt catch my meaning , btw thanks for help – Emad mohseny Jun 23 '16 at 14:47
@Emadsharifmohseny: I can only answer the question that was asked. If you want something *"like chess"*, and the answer that's offering something *"like chess"* doesn't address your question, then you have meant to ask a different question than you did. If you are looking for a grid, the `MoveTo` and `LineTo` are the calls to use. – IInspectable Jun 23 '16 at 14:53

drawing square net in SDI MFC

1 Answers1