using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;

namespace UploadThumbnail
{
    public partial class FormImageToThumbnain : Form
    {
        private int OrgWidth { get; set; }
        private int OrgHeight { get; set; }
    

        public FormImageToThumbnain()
        {
            InitializeComponent();
        }

        private void btUpload_Click(object sender, EventArgs e)
        {
            OpenFileDialog opendialog = new OpenFileDialog();

            opendialog.Filter = "Image files(*.jpg; *.jpeg; *.gif)| *.jpg; *.jpeg; *.gif";

            if (opendialog.ShowDialog() == DialogResult.OK)
            {

                Bitmap img = new Bitmap(opendialog.FileName);
                OrgWidth = img.Width;
                OrgHeight = img.Height;

                pbUpload.Image = img.GetThumbnailImage(350, 350, null, new IntPtr());

                opendialog.RestoreDirectory = true;
                CreateThumb();
            }
        }

        private void tBar_Scroll(object sender, EventArgs e)
        {
            label1.Text = "Prozent:" + tBar.Value;
            if (OrgWidth > 0 && OrgHeight > 0)
                CreateThumb();
        }

        private void CreateThumb()
        {
            Image imag = pbUpload.Image;
            decimal inPrc = tBar.Value ;
            int widthPerc = (int)Math.Abs(OrgWidth * inPrc/100);
            int heightPerc = (int)Math.Abs(OrgHeight * inPrc/100);

            pbThumbnail.Image = imag.GetThumbnailImage(widthPerc, heightPerc, null, new IntPtr());
            pbThumbnail.Width = widthPerc;
            pbThumbnail.Height = heightPerc;

            lblOutput.Text = string.Format("\nOriginalgröße Width:{0} Height:{1}", OrgWidth, OrgHeight);
            lblOutput.Text += string.Format("\nThumbgröße Width:{0} Height:{1}", widthPerc, heightPerc);
            this.Height = heightPerc + 100;
            this.Width = widthPerc+250;
         
        }
    }
}