public void drawLine(SpriteBatch spriteBatch, int x0, int y0, int x1, int y1, Color color)
        {
            int xlength = Math.Max(x0, x1) - Math.Min(x0, x1);
            int ylength = Math.Max(y0, y1) - Math.Min(y0, y1);
            double length = Math.Sqrt(xlength * xlength + ylength * ylength);
            float angle;
            if (x0 > x1 & y0 > y1)
            {
                angle = (float)Math.Acos(xlength / length) + MathHelper.ToRadians(180);
            }
            else if (x0 < x1 & y0 > y1)
            {
                angle = (float)Math.Asin(-ylength / length);
            }
            else if (x0 > x1 & y0 < y1)
            {
                angle = (float)Math.Acos(-xlength / length);
            }
            else if (x0 < x1 & y0 < y1)
            {
                angle = (float)Math.Asin(ylength / length);
            }
            else if (x0 < x1 & y0 == y1)
            {
                angle = MathHelper.ToRadians(0);
            }
            else if(x0 > x1 & y0 == y1)
            {
                angle = MathHelper.ToRadians(180);
            }
            else if(x0 == x1 & y0 > y1)
            {
                angle = MathHelper.ToRadians(270);
            }
            else if (x0 == x1 & y0 < y1)
            {
                angle = MathHelper.ToRadians(90);
            }
            else
            {
                angle = 0;
            }
            spriteBatch.Draw(pixel1x1, new Vector2(x0, y0), null, color, angle, new Vector2(0, 0), new Vector2((int)length, 1), SpriteEffects.None, 0);
        }