Color not working when using an mouse event.

This is a discussion on Color not working when using an mouse event. within the C# Programming forums, part of the General Programming Boards category; First of all, im not really sure how to explain this very well as I am finding it very very ...

  1. #1
    Registered User
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    Color not working when using an mouse event.

    First of all, im not really sure how to explain this very well as I am finding it very very strange.

    I am trying to draw a grid into a form and have the colours of the grid change if they are selected by the user.

    Here is my draw and mouse event handler:
    Code:
     private void OnPaint(object sender, PaintEventArgs e)
            {
                Painter.Instance.ClearScreen(Color.Blue);
                //m_mainGrid[0].IsSelected = true;
                foreach (GridNode node in m_mainGrid)
                    node.Draw(true, true);
            }
    
            private void OnClick(object sender, EventArgs e)
            {
                m_mainGrid[0].IsSelected = true;
                Invalidate();
            }
    GridNode.Draw is defined like this:
    Code:
    public void Draw(bool showId, bool showPos)
            {
                if (IsSelected)
                    Painter.Instance.FillBorderRectangle(Rect, Color.Green, Color.Black);
                else
                    Painter.Instance.FillBorderRectangle(Rect, Color.Red, Color.Black);
            }
    The problem I am having is that even when the node is selected it gets drawn as red. The debugger breaks into the DrawMethod and sets it to Green and it never breaks into the line where it goes to red. But still the image on my screen is red.

    If I uncomment the m_mainGrid[0].IsSelected = true line, it does show up as green.

    Any ideas?

  2. #2
    Gawking at stupidity
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    Oregon, USA
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    3,159
    Don't you want to be using e.Graphics from the OnPaint() method to draw with? What is your Painter class?
    If you understand what you're doing, you're not learning anything.

  3. #3
    Registered User C_ntua's Avatar
    Join Date
    Jun 2008
    Posts
    1,853
    There can be a lot of things wrong. Try to exclude some situations like
    1) Maybe you have overlapping nodes? Try only with one (no foreach)
    2) Is the code working, I mean is it re-drawing something i.e. initially it is black and becomes red, even though you want it green, but at least it re-draws the node.

    But e.Graphics is probably what you want. You can use your design and pass the e.Graphics to function Draw and use something like Graphics.FillRectangle(..) and the such to do what you want from the Draw function

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