[WINFORM] Image map creation and get html code as output

To draw multiple triangles over an image you will have to create a triangle class and a list of triangles
The drawing event will then be done in picturebox paint event
Can you upload your code so I can help you modify it

Hi Frog!!

Sorry for troubling you again

Its really hard to draw multiple traingles on a picturebox over image

if i draw second rectangle then first one disappears

Advanced thanks

Thanks for the idea frog

i tried in form its working but i want to do in Picture box over the image !!!

i do dynamic creation of picture box
check my coding below

        Rectangle rct, rectClear;
        bool _mouseDown = false;
        Point pt;

        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog opfd = new OpenFileDialog();
            opfd.Multiselect = true;
            if (opfd.ShowDialog() == DialogResult.OK)
            {
                int i=0;
                tableLayoutPanel2.Controls.Clear();
                foreach (string filename in opfd.FileNames)
                {
                    PictureBox p = new PictureBox();           
                    p.ImageLocation = filename;
                    p.Width = 700;
                    p.Height = 30;
                    p.SizeMode = PictureBoxSizeMode.StretchImage;
                    p.Cursor = Cursors.Cross;
                    tableLayoutPanel2.SetRow(p,i);
                    tableLayoutPanel2.Controls.Add(p);
                   
                    p.MouseDown += new MouseEventHandler(p_MouseDown);
                    p.MouseMove += new MouseEventHandler(p_MouseMove);
                    p.Paint += new PaintEventHandler(p_Paint);
                    p.MouseUp += new MouseEventHandler(p_MouseUp);
                   

                    i++;
                }
            }
        }

        void p_MouseUp(object sender, MouseEventArgs e)
        {
            _mouseDown = false;
        }

        void p_Paint(object sender, PaintEventArgs e)
        {

            if (rct != null)
            {
                e.Graphics.DrawRectangle(Pens.Red, rct);
            }

        }

        void p_MouseMove(object sender, MouseEventArgs e)
        {

            if (_mouseDown == true)
            {

                Region r = new System.Drawing.Region(rectClear);
                Invalidate(r);
                Graphics g = this.CreateGraphics();// draw temp rct
                rct = Rectangle.FromLTRB(pt.X, pt.Y, e.X, e.Y);
                rectClear = Rectangle.Inflate(rct, 2, 2);
                g.DrawRectangle(Pens.Red, rct);
            }
        }

        void p_MouseDown(object sender, MouseEventArgs e)
        {
            _mouseDown = true;
            pt = e.Location;

        }