Loading animation surrounded by Winform circles

Previously, I wrote a WPF Loading animation with circular circles. Now I want to write a Winform Loading animation with circular circles.

1. Create a Winform project and add a pictureBox control named pictureBox;

2. Add using System. Drawing. Drawing2D to the reference;

3. The Form is named Loading. All the codes of cs are as follows:

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;using System.Collections;using System.Drawing.Drawing2D;namespace Circle_ProcessBar{    public partial class Loading : Form    {        private int count = -1;        private ArrayList images = new ArrayList();        public Bitmap[] bitmap = new Bitmap[8];        private int _value = 1;        private Color _circleColor = Color.Red;        private float _circleSize = 0.8f;                public Loading()        {            InitializeComponent();               }        public Color CircleColor        {            get { return _circleColor; }            set            {                _circleColor = value;                Invalidate();            }        }        public float CircleSize        {            get { return _circleSize; }            set            {                if (value <= 0.0F)                    _circleSize = 0.05F;                else                    _circleSize = value > 4.0F ? 4.0F : value;                Invalidate();            }        }        public Bitmap DrawCircle(int j)        {            const float angle = 360.0F / 8; Bitmap map = new Bitmap(150, 150);            Graphics g = Graphics.FromImage(map);                        g.TranslateTransform(Width / 2.0F, Height / 2.0F);            g.RotateTransform(angle * _value);            g.InterpolationMode = InterpolationMode.HighQualityBicubic;            g.SmoothingMode = SmoothingMode.AntiAlias;            int[] a = new int[8] { 25, 50, 75, 100, 125, 150, 175, 200 };            for (int i = 1; i <= 8; i++)            {                int alpha = a[(i + j - 1) % 8];                Color drawColor = Color.FromArgb(alpha, _circleColor);                using (SolidBrush brush = new SolidBrush(drawColor))                {                    float sizeRate = 3.5F / _circleSize;                    float size = Width / (6 * sizeRate);                    float diff = (Width / 10.0F) - size;                    float x = (Width / 80.0F) + diff;                    float y = (Height / 80.0F) + diff;                    g.FillEllipse(brush, x, y, size, size);                    g.RotateTransform(angle);                }            }            return map;        }        public void Draw()        {            for (int j = 0; j < 8; j++)            {                bitmap[7-j] = DrawCircle(j);            }        }        protected override void OnResize(EventArgs e)        {            SetNewSize();            base.OnResize(e);        }        protected override void OnSizeChanged(EventArgs e)        {            SetNewSize();            base.OnSizeChanged(e);        }        private void SetNewSize()        {            int size = Math.Max(Width, Height);            Size = new Size(size, size);        }        public void set()        {            for (int i = 0; i < 8; i++)            {                Draw();                Bitmap map = new Bitmap((bitmap[i]), new Size(120, 110));                images.Add(map);            }            pictureBox.Image = (Image)images[0];           pictureBox.Size = pictureBox.Image.Size;        }        private void pictureBox_Click(object sender, EventArgs e)        {            this.Visible = false;            base.Dispose();        }        private void Timer_Tick(object sender, EventArgs e)        {            set();            count = (count + 1) % 8;            pictureBox.Image = (Image)images[count];        }        private void button1_Click(object sender, EventArgs e)        {            this.Visible = false;            base.Dispose();        }    }}

4. Results