using System;
using System.Drawing;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace BlindSpot
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        Point p1 = new Point(2792, 850);
        Point p2 = new Point(3000, 1024);
        Rectangle rect;

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.CopyFromScreen(p1, Point.Empty, rect.Size);
            CURSORINFO pci;
            pci.cbSize = Marshal.SizeOf(typeof(CURSORINFO));

            if (GetCursorInfo(out pci))
            {
                if (pci.flags == CURSOR_SHOWING)
                {
                    DrawIcon(e.Graphics.GetHdc(), pci.ptScreenPos.x - p1.X, pci.ptScreenPos.y - p1.Y, pci.hCursor);
                    e.Graphics.ReleaseHdc();
                }
            }
        }

        protected override void OnPaintBackground(PaintEventArgs e)
        {
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (rect.Contains(Cursor.Position))
            {
                if (!Visible) Show();
                Invalidate();
            }
            else if (Visible)
            {
                Hide();
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            rect = new Rectangle(p1, new Size(p2.X - p1.X, p2.Y - p1.Y));
            ClientSize = rect.Size;
            timer1.Interval = 33;
            timer1.Enabled = true;
        }



        #region Native stuff
        [StructLayout(LayoutKind.Sequential)]
        struct CURSORINFO
        {
            public Int32 cbSize;
            public Int32 flags;
            public IntPtr hCursor;
            public POINTAPI ptScreenPos;
        }

        [StructLayout(LayoutKind.Sequential)]
        struct POINTAPI
        {
            public int x;
            public int y;
        }

        [DllImport("user32.dll")]
        static extern bool GetCursorInfo(out CURSORINFO pci);

        [DllImport("user32.dll")]
        static extern bool DrawIcon(IntPtr hDC, int X, int Y, IntPtr hIcon);

        const Int32 CURSOR_SHOWING = 0x00000001;
        #endregion
    }
}