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;

namespace malen
{
    public partial class Form1 : Form
    {
        public Point neu = new Point(); 
        public Point alt = new Point();
        public Pen p = new Pen(Color.Black, 5);
        public Graphics g;
        public Bitmap bittymap;

        public Form1()
        {
            InitializeComponent();

            bittymap = new Bitmap(500, 500);
            g = Graphics.FromImage(bittymap);
            g.Clear(SystemColors.Control);

            p.SetLineCap(System.Drawing.Drawing2D.LineCap.Round, System.Drawing.Drawing2D.LineCap.Round, System.Drawing.Drawing2D.DashCap.Round);
        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                neu = e.Location;
                g.DrawLine(p, neu, alt);
                alt = neu;

                pictureBox1.Image = bittymap;
            }
        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            alt = e.Location;

            if (e.Button == MouseButtons.Right)
            {
                g.Clear(SystemColors.Control);

                pictureBox1.Image = bittymap;
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string path = Environment.GetFolderPath(Environment.SpecialFolder.Desktop) + @"\bittymap.bmp";
            bittymap.Save(path, System.Drawing.Imaging.ImageFormat.Bmp);
        }
    }
}