using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace GrafEditor
{
    public partial class Form_kr : Form
    {
        Color barva;
        Color vypln;
        Pen pero;
        Brush stetec;
        Graphics grfx;
        int w, h, delka, vyska;
        bool press;
        int x, y, xs, ys;
        Image obrazek;
        
        
        public Form_kr()
        {
            InitializeComponent();
            w = pictureBox_kr.Width;
            h = pictureBox_kr.Height;
            Bitmap bm = new Bitmap(w, h);
            grfx = Graphics.FromImage(bm);
            stetec = new SolidBrush(Color.White);
            grfx.FillRectangle(stetec, 0, 0, w, h);
            pictureBox_kr.Image = bm;
        }

        private void Form_kr_Load(object sender, EventArgs e)
        {
            radioButton_usecka.Checked = true;
            radioButton_cara.Checked = false;
            radioButton_elipsa.Checked = false;
            radioButton_elipsa_vypln.Checked = false;
            radioButton_rectangle.Checked = false;
            radioButton_rectangle_vypln.Checked = false;
            comboBox_tl.Text = "1";
            barva = Color.White;
            vypln = Color.White;
            xs = 0;
            ys = 0;
        }

        private void Form_kr_SizeChanged(object sender, EventArgs e)
        {
            delka = ClientSize.Width;
            vyska = ClientSize.Height;
            panel_config.Width = delka - 6;
            panel_config.Height = 60;
            pictureBox_kr.Width = delka - 30;
            pictureBox_kr.Height = vyska - 90;
            w = pictureBox_kr.Width;
            h = pictureBox_kr.Height;
            Bitmap bm = new Bitmap(w, h);
            grfx = Graphics.FromImage(bm);
            stetec = new SolidBrush(Color.White);
            grfx.FillRectangle(stetec, 0, 0, w, h);
            pictureBox_kr.Image = bm;
        }

        private void textBox_barva_cara_Click(object sender, EventArgs e)
        {
            if (colorDialog1.ShowDialog() == DialogResult.OK)
            {
                barva = colorDialog1.Color;
                textBox_barva_cara.BackColor = barva;
            }
        }

        private void textBox_barva_vypln_Click(object sender, EventArgs e)
        {
            if (colorDialog1.ShowDialog() == DialogResult.OK)
            {
                vypln = colorDialog1.Color;
                textBox_barva_vypln.BackColor = vypln;
            }
        }

        private void pictureBox_kr_MouseDown(object sender, MouseEventArgs e)
        {
            press = true;
            xs = e.X;
            ys = e.Y;
            obrazek = new Bitmap(pictureBox_kr.Image);
        }

        private void pictureBox_kr_MouseUp(object sender, MouseEventArgs e)
        {
            press = false;
        }

        private void pictureBox_kr_MouseMove(object sender, MouseEventArgs e)
        {
            if (press)
            {
                grfx = Graphics.FromImage(pictureBox_kr.Image);
                grfx.DrawImage(obrazek, 0, 0);

                if (radioButton_usecka.Checked)
                {
                    pero = new Pen(barva);
                    pero.Width = Convert.ToInt32(comboBox_tl.Text);
                    grfx.DrawLine(pero, xs, ys, e.X, e.Y);
                }

                if (radioButton_elipsa.Checked)
                {
                    pero = new Pen(barva);
                    pero.Width = Convert.ToInt32(comboBox_tl.Text);
                    grfx.DrawEllipse(pero, xs, ys, e.X - xs, e.Y - ys);
                }

                if (radioButton_elipsa_vypln.Checked)
                {
                    pero = new Pen(barva);
                    pero.Width = Convert.ToInt32(comboBox_tl.Text);
                    grfx.DrawEllipse(pero, xs, ys, e.X - xs, e.Y - ys);
                    stetec = new SolidBrush(vypln);
                    grfx.FillEllipse(stetec, xs+2, ys+2, e.X - xs-3, e.Y - ys-3);
                }

                if (radioButton_rectangle.Checked)
                {
                    pero = new Pen(barva);
                    pero.Width = Convert.ToInt32(comboBox_tl.Text);
                    grfx.DrawRectangle(pero, xs, ys, e.X - xs, e.Y - ys);
                }

                if (radioButton_rectangle_vypln.Checked)
                {
                    pero = new Pen(barva);
                    pero.Width = Convert.ToInt32(comboBox_tl.Text);
                    grfx.DrawRectangle(pero, xs, ys, e.X - xs, e.Y - ys);
                    stetec = new SolidBrush(vypln);
                    grfx.FillRectangle(stetec, xs+2, ys+2, e.X - xs-3, e.Y - ys-3);
                }

                if (radioButton_cara.Checked)
                {
                        x = e.X;
                        y = e.Y;
                        pero = new Pen(barva);
                        pero.Width = Convert.ToInt32(comboBox_tl.Text);
                        grfx.DrawLine(pero, xs, ys, x, y);
                        obrazek = new Bitmap(pictureBox_kr.Image);
                        grfx.DrawImage(obrazek, 0, 0);
                       xs = e.X;
                       ys = e.Y;
                }
            
            }
            pictureBox_kr.Invalidate();
            pictureBox_kr.Update();
        }

        private void button_uloz_Click(object sender, EventArgs e)
        {
            SaveFileDialog Dialog = new SaveFileDialog();
            Dialog.InitialDirectory = System.Environment.CurrentDirectory;
            Dialog.Filter = "PNG Files(*.png)|*.png";
            if (Dialog.ShowDialog() == DialogResult.OK)
            {
                pictureBox_kr.Image.Save(Dialog.FileName, ImageFormat.Png);
            }
            else
            {
                MessageBox.Show("Obrázek nebyl uložen!", "Varování", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
        }

        private void button_vymazat_Click(object sender, EventArgs e)
        {
            comboBox_tl.Text = "1";
            barva = Color.White;
            vypln = Color.White;
            textBox_barva_cara.BackColor = barva;
            textBox_barva_vypln.BackColor = vypln;
            grfx.Clear(vypln);
            x = 0; y = 0;
            pictureBox_kr.Refresh();
        }
    }
}