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 WindowsFormsApplication3
{
    public partial class Form1 : Form
    {

        float slope;
        int yintercept;

        private void button1_Click(object sender, EventArgs e)
        {

            slope = float.Parse(textBox1.Text);
            yintercept = int.Parse(textBox2.Text);

            drawLine();

        }


        PictureBox pb;
        Pen pen = new Pen(Color.Black, 5);
        Pen gridPen = new Pen(Color.DarkGray, 2);
        Pen pointPen = new Pen(Color.Black, 15);
        Pen linePen = new Pen(Color.Black, 1);



        Bitmap surface;
        Graphics device;



        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            pb = new PictureBox();
            pb.Parent = this;
            pb.Dock = DockStyle.Fill;
            pb.BackColor = Color.White;

            this.Text = "Graph Drawing";
            this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle;
            this.MaximizeBox = false;
            this.Size = new Size(1500, 800);

            surface = new Bitmap(1500, 800);
            pb.Image = surface;
            device = Graphics.FromImage(surface);

            drawGrid();
            drawPlane();


        }

        public void drawPlane()
        {

            device.DrawLine(pen, 100, 0, 100, 800);
            device.DrawLine(pen, 0, 700, 1500, 700);

            pb.Image = surface;

        }

        public void drawGrid()
        {
            for (int i = 0; i < 1500; i += 50)
            {
                device.DrawLine(gridPen, i, 0, i, 800);
            }

            for (int j = 0; j < 800; j += 50)
            {
                device.DrawLine(gridPen, 0, j, 1500, j);
            }

                pb.Image = surface;

        }

        public void drawLine()
        {
            yintercept *= 50;

            float x = 0;
            float y = 0;

            for (int k = 0; k < 1500; k++)
            {
                x++;
                y = x * -slope - yintercept;


                device.DrawLine(linePen, x  + 100, y + 700, x + 99, y + 701);

            }

            pb.Image = surface;

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }






    }
}