[c#] draw rectangle in any direction

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How to draw a rectangle in any direction? This code works only if you draw from top left corner and drag to the lover right corner.

in mouseup event:

r = new Bitmap(f1.pictureBox4.Image); 
                gra = Graphics.FromImage(r); 
                Pen p = new Pen(f1.toolStripButton8.BackColor, int.Parse(f1.toolStripComboBox1.Text));
                f1.pictureBox4.Image = r;
ControlPaint.DrawReversibleFrame(f1.pictureBox4.RectangleToScreen(nakaPra), Color.Black, FrameStyle.Dashed);
                gra.DrawRectangle(p, nakPra);

in mousemove event:

 ControlPaint.DrawReversibleFrame(f1.pictureBox4.RectangleToScreen(nakPra), Color.Black, FrameStyle.Dashed);
                    nakPra.Width = e.X - nakPra.X;
                    nakPra.Height = e.Y - nakPra.Y;
ControlPaint.DrawReversibleFrame(f1.pictureBox4.RectangleToScreen(nakPra), Color.Black, FrameStyle.Dashed);

I want to drag from any corner. How to fix it?

Posted 29-Nov-12 3:19am

marcel zol

Updated 29-Nov-12 11:08am

v2

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Sergey Alexandrovich Kryukov 29-Nov-12 12:57pm

System.Windows.Forms? Tag: "Forms"...
--SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2012-11-29T07:06:00

For orientation, you need to use System.Drawing.Graphics.Transform:
http://msdn.microsoft.com/en-us/library/system.drawing.graphics.transform.aspx[^],
http://msdn.microsoft.com/en-us/library/system.drawing.drawing2d.matrix.aspx[^].

Besides, it looks you are trying to use the class PictureBox with something interactive. In principle, you could, but it makes no sense at all. You get nothing from this control, except a lot of extra useless development work and eating up extra resources. The only purpose of this control is to provide simplified way of presenting a simple image, usually static. You need to draw immediately on your control, typically derived from System.Windows.Forms.Control. I explain it in my past answers:
How do I clear a panel from old drawing[^],
draw a rectangle in C#[^],
Append a picture within picturebox[^].

Instead of helping developers, this PictureBox control became a real curse of the beginners. Too much time lost for wrong development and explanations of what should be done. Don't go in wrong direction.

For some more detail on rendering, please also see these answers:
Drawing Lines between mdi child forms[^],
capture the drawing on a panel[^],
What kind of playful method is Paint? (DataGridViewImageCell.Paint(...))[^].

Good luck,

—SA