using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;

namespace Zelvaci
{
    class Zelvak{
        private Graphics g;
        private Image img;
        private int angle = -90;
        private PointF pt;
        private Pen pen;
        private int width;
        private Color color;

        public Zelvak(int width, int height) {
            img = new Bitmap(width, height);
            g = Graphics.FromImage(img);
            g.FillRectangle(Brushes.White, 0, 0, width, height);
            pt = new PointF(width/2f, height/2f);
            color = System.Drawing.Color.Black;
        }

        public void Left(int angle) {
            this.angle = this.angle - angle;
            while (this.angle < 0) this.angle += 360;
            this.angle %= 360;
        }

        public void Right(int angle) {
            Left(-angle);
        }

        public void Pen(int width) {
            if (width <= 0)
                pen = null;
            else
            {
                this.width = width;
                pen = new Pen(color, width);
            }
        }

        public bool IsPen(){
            return pen != null;
        }

        public void Forward(int steps) {
            PointF next = new PointF(pt.X + steps * (float)Math.Cos(ToRadians(angle)), pt.Y + steps * (float)Math.Sin(ToRadians(angle)));

            if (IsPen())
                g.DrawLine(pen, pt, next);

            pt = next;
        }

        public void Color(int red, int green, int blue) {
            this.color = System.Drawing.Color.FromArgb(red, green, blue);
            pen = new Pen(color, width);
        }

        private float ToRadians(int angle) {
            return ((float)angle) * 0.017453292519943295769111452467007f;
        }

        public Image GetImage() {
            return img;
        }
    }
}