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 _3dEngine
{
    public partial class Form1 : Form
    {
        public Point[] map = { new Point(-100, -100), new Point(-100, 100), new Point(-100, 100), new Point(100, 100),
            new Point(100, 100), new Point(100, -100), new Point(100, -100), new Point(-100, -100) };
        public Point playerPos = new Point(0, 0);
        public float playerAngle = 32;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            Point sc1 = new Point(400, 500);
            Padding pad = new Padding(10, 10, 10, 10);
            Pen bd = new Pen(Color.Blue, 3);
            Pen[] pens = { new Pen(Color.Blue), new Pen(Color.Red), new Pen(Color.YellowGreen), new Pen(Color.Turquoise) };
            int pi = 0;
            Graphics gr = e.Graphics;

            gr.DrawLine(bd, 0, 0, sc1.X, 0);
            gr.DrawLine(bd, sc1.X, 0, sc1.X, sc1.Y);
            gr.DrawLine(bd, sc1.X, sc1.Y, 0, sc1.Y);
            gr.DrawLine(bd, 0, sc1.Y, 0, 0);

            // basically just padding, centers the screen instead of it being to the top left.
            gr.TranslateTransform(sc1.X / 2, sc1.Y / 2);

            // draw player, note 0, 0 as the player is 'truly' static
            gr.DrawEllipse(new Pen(Color.Red), -5, -5, 10, 10);

            // translate the world around the player
            gr.TranslateTransform(playerPos.X, playerPos.Y);
            gr.RotateTransform(playerAngle);

            //draw the world
            for (int i = 0; i + 1 < map.Length; i += 2)
            {
                gr.DrawLine(pens[pi], map[i].X, map[i].Y, map[i + 1].X, map[i + 1].Y);
                pi++;
                pi %= pens.Length;
            }
        }

        private void Form1_KeyPress_1(object sender, KeyPressEventArgs e)
        {
            if (e.KeyChar == 'q') { playerAngle--; }
            else if (e.KeyChar == 'e') { playerAngle++; }
            else if (e.KeyChar == 'w') { playerPos.Y--; }
            else if (e.KeyChar == 's') { playerPos.Y++; }
            else if (e.KeyChar == 'a') { playerPos.X--; }
            else if (e.KeyChar == 'd') { playerPos.X++; }
        }
    }
}