using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using Graphics;
using System.Drawing.Printing;

namespace Graphics
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private Bitmap bmp;
        private Pen pen_for_draw = new Pen(Color.Black, 4);
        private string name_of_image;

        private void button1_Click(object sender, EventArgs e)
        {
            {
                OpenFileDialog open_dialog = new OpenFileDialog();
                open_dialog.Filter = "Image Files(*.BMP;*.JPG;*.GIF;*.PNG)|*.BMP;*.JPG;*.GIF;*.PNG|All files (*.*)|*.*";
                if (open_dialog.ShowDialog() == DialogResult.OK)
                {
                    try
                    {
                        name_of_image = open_dialog.FileName;
                        bmp = new Bitmap(open_dialog.FileName);
                        this.pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
                        pictureBox1.Image = bmp;
                        pictureBox1.Invalidate();
                        button2.Visible = true;
                        button3.Visible = true;
                        button4.Visible = true;
                        textBox1.Visible = true;
                        textBox2.Visible = true;
                        textBox3.Visible = true;
                        textBox4.Visible = true;
                        textBox5.Visible = true;
                        label1.Visible = true;
                        label1.Text = bmp.Width.ToString() + " " + bmp.Height.ToString();
                    }
                    catch
                    {
                        DialogResult rezult = MessageBox.Show("Impossible to open selected file",
                        "Warning", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    }
                }
            }
        }

        private void button4_Click(object sender, EventArgs e)
        {
            try
            {
                int per = Int32.Parse(textBox1.Text);

                Image myBitmap = pictureBox1.Image;
                Size nSize = new Size(pictureBox1.Image.Width * per / 100, pictureBox1.Image.Height * per / 100);
                Image gdi = new Bitmap(myBitmap, nSize);

                pictureBox1.Image = gdi;

            }
            catch (Exception er)
            {
                MessageBox.Show(er.Message);
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            button5.Visible = true;
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
        }

        private void button2_Click(object sender, EventArgs e)
        {
            try
            {
                int x = Int32.Parse(textBox2.Text);
                int y = Int32.Parse(textBox3.Text);
                int width = Int32.Parse(textBox4.Text);
                int height = Int32.Parse(textBox5.Text);
                Image image = pictureBox1.Image;

                Rectangle Rect = new Rectangle(x, y, width - x, height - y);
                Bitmap newb = new Bitmap(Rect.Width, Rect.Height);

                using (var g = System.Drawing.Graphics.FromImage(newb))
                    g.DrawImage(image, 0, 0, Rect, GraphicsUnit.Pixel);

                pictureBox1.Image = newb;
            }
            catch (Exception er)
            {
                MessageBox.Show(er.Message);
            }
        }
    }
}