C#

tamir901 wrote:

What i'm doing wrong???

Mark Nischalke wrote:

I see no humor in this

private void Form1_MouseMove(object sender, MouseEventArgs e)
{
    int widthHeight = 20;
    using (Graphics g = this.CreateGraphics())
    {
        g.FillEllipse(Brushes.Red, new Rectangle(
            e.X - (widthHeight / 2), 
            e.Y - (widthHeight / 2), 
            widthHeight, 
            widthHeight));
    }
}

private void pbPreview_MouseMove(object sender, MouseEventArgs e)
{

    if (e.Button == MouseButtons.Left)
    {
        int HW = 20;
        Bitmap b = (Bitmap)pbPreview.Image.Clone();
        Graphics g = Graphics.FromImage(b);
        g.FillEllipse(Brushes.Violet,
        new Rectangle(
            e.X - (HW / 2),
            e.Y - (HW / 2),
        HW,HW));
        pbPreview.Image = (Image)b;
    }
}

private void pbPreview_Paint(object sender, PaintEventArgs e)
{
    int HW = 20;
    Graphics g = e.Graphics;
    g.FillEllipse(Brushes.Yellow,
    new Rectangle(
        this.Cursor.HotSpot.X,
        this.Cursor.HotSpot.Y,
    HW, HW));
}

Christian Graus wrote:

mouse pos is always relative to something...
subtract the top left corner of the picturebox...

Christian Graus wrote:

there are ClientToScreen and ScreenToClient type methods on your controls which you can use.

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
    int widthHeight = 20;
    using (Graphics g = pictureBox1.CreateGraphics())
    { 
        g.FillEllipse(Brushes.Red, new Rectangle(
            e.X - (widthHeight / 2),
            e.Y - (widthHeight / 2),
            widthHeight,
            widthHeight));
    }
}

public class DrawablePictureBox : PictureBox
{
    private List<Rectangle> rectangles = new List<Rectangle>(100);

    public DrawablePictureBox()
    {
        LineWidth = 20;
        LineColor = Color.Red;
    }

    public int LineWidth
    {
        get;
        set;
    }
    public Color LineColor
    {
        get;
        set;
    }

    protected override void OnMouseMove(MouseEventArgs e)
    {
        base.OnMouseMove(e);
        if (e.Button == MouseButtons.Left)
        {
            Rectangle rectangle = new Rectangle(e.X - (LineWidth / 2),
                e.Y - (LineWidth / 2),
                LineWidth,
                LineWidth);
            rectangles.Add(rectangle);
            Invalidate(rectangle);
        }
    }

    protected override void OnPaint(PaintEventArgs pe)
    {
        base.OnPaint(pe);
        if (rectangles.Count > 0)
            using (Brush brush = new SolidBrush(LineColor))
            {
                foreach (Rectangle rectangle in rectangles)
                    pe.Graphics.FillEllipse(brush, rectangle);
            }
    }
}