using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        PictureBox pic = new PictureBox();
        Bitmap[] bmp = new Bitmap[2];
        Timer timer = new Timer();
        Rectangle SRect;
        GraphicsPath gp = new GraphicsPath();
        private void Form1_Load(object sender, EventArgs e)
        {
            this.FormBorderStyle = FormBorderStyle.FixedToolWindow;
            this.ClientSize = new Size(600, 600);
            pic.Dock = DockStyle.Fill;           
            this.Controls.Add(pic);

            bmp[0] = new Bitmap(600, 600, PixelFormat.Format32bppArgb);
            bmp[1] = new Bitmap(600, 600, PixelFormat.Format32bppArgb);

            SRect = new Rectangle(0, 0, 600, 600);
            gp.AddEllipse(0, 0, 10, 10);
            pic.Click += new EventHandler(pic_Click);
            timer.Interval = (int)(1.0f / 30.0f * 1000.0f);
            timer.Tick += new EventHandler(timer_Tick);
            timer.Enabled = true;
            this.ModeSet();
        }
        void ModeSet()
        {
            this.Text = "Mode = " + Mode.ToString();
            allb.Clear();
        }
        int Mode = 0;
        void pic_Click(object sender, EventArgs e)
        {
            if (Mode == 0)
            {
                Mode = 1;
            }
            else if (Mode == 1)
            {
                Mode = 2;
            }
            else if (Mode == 2)
            {
                Mode = 0;
            }
            this.ModeSet();
        }
        int screen = 0;
        int SetCount = 0;
        List<Bullet> allb = new List<Bullet>();
        List<Bullet> delb = new List<Bullet>();
        Font stringFont = new Font(new FontFamily("メイリオ"), 20.0f);
        //int pppp = 0;
        void timer_Tick(object sender, EventArgs e)
        {
            if (Mode == 0)
            {
            }
            else if (Mode == 1)
            {
                //if (SetCount == 10)
                {
                    //this.SetBullet(15, 5);
                    this.SetBullet1(15, 5, SetCount);
                    //SetCount = -1;
                }
                SetCount++;
                if (SetCount >= 15) SetCount = 0;
                //pppp++;
            }
            else if (Mode == 2)
            {
                //if (SetCount == 10)
                {
                    //this.SetBullet(30, 5);
                    this.SetBullet1(30, 5, SetCount);
                    //SetCount = -1;
                }
                SetCount++;
                if (SetCount >= 30) SetCount = 0;
                //pppp++;
            }
            using (Graphics g = Graphics.FromImage(bmp[screen]))
            {
                g.FillRectangle(Brushes.White, SRect);
                Matrix m = new Matrix();
                foreach (Bullet b in allb)
                {
                    if (!b.Move())
                    {
                        m.Translate(b.Lx, b.Ly);
                        g.Transform = m;
                        g.FillPath(Brushes.Blue, gp);
                        m.Reset();
                        g.Transform = m;
                    }
                    else
                    {
                        delb.Add(b);
                    }
                }
                g.DrawString("Bullet = " + allb.Count.ToString(),
                    stringFont, Brushes.Black, 10.0f, 10.0f);
            }
            pic.Image = bmp[screen];
            screen ^= 1;
            foreach (Bullet b in delb)
            {
                allb.Remove(b);
            }
            delb.Clear();
        }
        void SetBullet(int Num, double Vec)
        {
            if (Num < 10) Num = 10;
            if (Num > 360) Num = 360;
            double Angle = Math.PI * (360.0 / Num) /180.0;
            for (int i = 0; i < Num; i++)
            {
                Bullet b = new Bullet();
                b.DeleteTime = 100;
                b.Lx = 300;
                b.Ly = 300;
                b.Vx = (float)(Vec * Math.Cos(Angle * i));
                b.Vy = (float)(Vec * Math.Sin(Angle * i));
                //x' = x * cosθ - y * sinθ
                //y' = x * sinθ + y * cosθ
                //↓
                //x = v * cosθ
                //y = v * sinθ
                allb.Add(b);
            }
        }
        void SetBullet1(int Num, double Vec,int i)
        {
            if (Num < 10) Num = 10;
            if (Num > 360) Num = 360;
            double Angle = Math.PI * (360.0 / Num) / 180.0;
            //for (int i = 0; i < Num; i++)
            {
                Bullet b = new Bullet();
                b.DeleteTime = 100;
                b.Lx = 300;
                b.Ly = 300;
                b.Vx = (float)(Vec * Math.Cos(Angle * i));
                b.Vy = (float)(Vec * Math.Sin(Angle * i));
                //x' = x * cosθ - y * sinθ
                //y' = x * sinθ + y * cosθ
                //↓
                //x = v * cosθ
                //y = v * sinθ
                allb.Add(b);
            }
        }
    }
    public class Bullet
    {
        public float Lx { get; set; }
        public float Ly { get; set; }
        public Size Size { get; set; }
        public float Vx { get; set; }
        public float Vy { get; set; }
        public int DeleteTime { get; set; }
        public bool Move()
        {
            this.Lx += Vx;
            this.Ly += Vy;
            DeleteTime--;
            if (DeleteTime < 0) return true;
            return false;
        }
    }
}