this is a screenshot of my form1 and there is a small offset between the point and the mouse cursor. the point should be drawn where the mouse cursor arrow is.

if for example i click with the mouse inside the picturebox top left corner at 0,0 i should see half of point but i see the completed point because that offset between the point and the mouse cursor. the drawing is not accurate.

the form1 code:

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 Mouse_Click_Test
{
    public partial class Form1 : Form
    {
        int x, y;

        public Form1()
        {
            InitializeComponent();
        }

        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.DrawEllipse(Pens.Red, x, y, 20, 20);
        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            this.x = e.X;
            this.y = e.Y;

            pictureBox1.Invalidate();
        }
    }
}