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POIn a PictureBox, drawing a temporary circle on mouse down, to follow the mouse, until the mouseUp event is detected
 

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  1. POIn a PictureBox, drawing a temporary circle on mouse down, to follow the mouse, until the mouseUp event is detected
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    <p>I'm really new to drawing in C#, and I'm using Windows Forms instead of WPF, so maybe I'm doing it wrong from the get-go... you tell me... but I'd like to have a temporary marker put down on the PictureBox (on MouseDown) that will follow the mouse (erasing the previous drawings of itself, i.e. not leaving a trail), and then being drawn in the final position on the MouseUp event.</p> <p>Here's some skeleton code that you guys can fill in:</p> <pre><code>bool mDown; Graphics g; // initialized to pictureBox1.CreateGraphics() on Form_Load, though // I am unsure how that differs from Graphics.FromImage(pictureBox1) SolidBrush sbGray, sbGreen; private void pictureBox1_MouseDown(object sender, MouseEventArgs e) { mDown = true; // store/push initial drawing g.FillEllipse(sbGray, e.X - 5, e.Y - 5, 10, 10); } private void pictureBox1_MouseMove(object sender, MouseEventArgs e) { if (mDown) { // restore/pop initial drawing, erasing old trail g.FillEllipse(sbGray, e.X - 5, e.Y - 5, 10, 10); } } private void pictureBox1_MouseClick(object sender, MouseEventArgs e) { // restore/pop initial drawing, erasing old trail g.FillEllipse(sbGreen, e.X - 5, e.Y - 5, 10, 10); mDown = false; } </code></pre> <p>I suppose there are several ways to skin a cat, such as changing the mouse icon, so perhaps this is not even the best way to do it? Even so, I will probably need to know the answers to both questions -- whether there is a better way to do it, and also how to extract the graphics from a PictureBox (as this knowledge will most likely prove useful later anyways.)</p> <p>(Note: Although the gray circles should erase themselves, the green circles should be persistent and multiple green circles should be capable of existing in the PictureBox at the same time.)</p>
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    1. COThere are *many* problems with using CreateGraphics(), you haven't seen them all. Sure, use the pictureBox1.Cursor property instead, that's what it is for.
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      1. USHans Passant
 

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