private Point m_debut_rect; private void pictureBox_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) { m_debut_rect = new Point(e.X, e.Y); } private void pictureBox_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e) { Bitmap bmp = new Bitmap(pictureBox.Image, pictureBox.Size); Graphics g = Graphics.FromImage(bmp); Rectangle rectangle = Rectangle.FromLTRB(m_debut_rect.X, m_debut_rect.Y, e.X, e.Y); g.DrawRectangle(Pens.Black, rectangle); pictureBox.Image = bmp; }
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