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 SimplePaint
{
    public partial class form1 : Form
    {
        Graphics gr;
        Pen pen = new Pen(Color.Black);
        Random ran = new Random();
        public form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            gr = this.CreateGraphics();
        }

        private void Form1_MouseClick(object sender, MouseEventArgs e)
        {
            if(e.Button == MouseButtons.None)
            {
                gr.Clear(Color.FromArgb(ran.Next(0, 255), ran.Next(0, 255), ran.Next(0, 255)));
            }
        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            gr.Dispose();
        }

        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            Rectangle r = new Rectangle();
            if (e.Button != MouseButtons.Left)
            {
                return;
            }
            else
            {
                r.X = e.X - 1;
                r.Y = e.Y - 1;
                r.Width = 1;
                r.Height = 1;
                gr.DrawRectangle(pen, e.X, e.Y, int.Parse(textBox1.Text), int.Parse(textBox1.Text));
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            pen.Color = button1.BackColor;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            pen.Color = button2.BackColor;

        }

        private void button3_Click(object sender, EventArgs e)
        {
            pen.Color = button3.BackColor;

        }

        private void button4_Click(object sender, EventArgs e)
        {
            pen.Color = button4.BackColor;

        }

        private void button5_Click(object sender, EventArgs e)
        {
            pen.Color = button5.BackColor;

        }

        private void button6_Click(object sender, EventArgs e)
        {
            ColorDialog c = new ColorDialog();
            if (c.ShowDialog() == DialogResult.OK)
            {
                pen.Color = c.Color;
            }

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void button7_Click(object sender, EventArgs e)
        {
            gr.Clear(form1.DefaultBackColor);
        }
    }
}