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.Drawing.Drawing2D;
using System.Drawing.Imaging;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        #region サンプルコード用
        Color[] _color = new Color[]
        {
            Color.Black,
            Color.Blue,
            Color.Red,
            Color.Green,
            Color.Gold,
            Color.Purple
        };
        LineCap[] _cap = new LineCap[]
        {
            LineCap.Flat,
            LineCap.Round,
            LineCap.Triangle,
        };
        DashStyle[] _style = new DashStyle[]
        {
            DashStyle.Solid,
            DashStyle.Dot,
            DashStyle.Dash,
            DashStyle.DashDot,
            DashStyle.DashDotDot
        };
        Random rnd = new Random();
        #endregion

        const int cw = 640;
        const int ch = 480;
        Bitmap[] bmp = new Bitmap[2];
        int screen = 0;
        Layer _Layer = new Layer();
        PictureBox pictureBox1 = new PictureBox();
        ToolStrip toolStrip1 = new ToolStrip();
        ToolStripButton toolStripButton1 = new ToolStripButton();
        private void Form1_Load(object sender, EventArgs e)
        {
            this.Controls.Add(toolStrip1);
            this.Controls.Add(pictureBox1);
            pictureBox1.Dock = DockStyle.Fill;
            //toolStrip1.SendToBack();
            toolStrip1.Items.Add(toolStripButton1);
            toolStripButton1.Text = "Line";
            toolStripButton1.Click += new EventHandler(toolStripButton1_Click);
            bmp[0] = new Bitmap(cw, ch, PixelFormat.Format32bppArgb);
            bmp[1] = new Bitmap(cw, ch, PixelFormat.Format32bppArgb);
            this.ScreenUpdate();
        }
        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            Pen p = new Pen(_color[rnd.Next(0,_color.Length-1)]);
            p.Width = (float)rnd.Next(1, 20);
            p.StartCap = _cap[rnd.Next(0,_cap.Length-1)];
            p.EndCap = _cap[rnd.Next(0,_cap.Length-1)];
            p.DashStyle = _style[rnd.Next(0,_style.Length-1)];
            _Layer.AddLine(p,
                new PointF(
                    (float)rnd.Next(20, cw-20),
                    (float)rnd.Next(20, ch-20)),
                new PointF(
                    (float)rnd.Next(20, cw-20),
                    (float)rnd.Next(20, ch-20))
                    );
            this.ScreenUpdate();
        }
        void ScreenUpdate()
        {
            using (Graphics g = Graphics.FromImage(bmp[screen]))
            {
                g.SmoothingMode = SmoothingMode.AntiAlias;
                g.FillRectangle(Brushes.White, 0, 0, cw, ch);
                _Layer.Draw(g);
            }
            pictureBox1.Image = bmp[screen];
            screen ^= 1;
        }
    }
    public class Layer
    {
        List<Shape> _Shapes = new List<Shape>();
        public Layer()
        {
        }
        public void AddLine(Pen p,PointF p1,PointF p2)
        {
            Shape s = new Shape();
            s.Pen = p;
            s.StartPoint = p1;
            s.EndPoint = p2;
            _Shapes.Add(s);
        }
        public void Draw(Graphics g)
        {
            foreach (Shape s in _Shapes)
            {
                switch (s.Type)
                {
                    case 0:
                        g.DrawLine(s.Pen, s.StartPoint, s.EndPoint);
                        break;
                    default:
                        break;
                }
            }
        }
    }
    public class Shape
    {
        public int Type = 0;
        public Pen Pen;
        public PointF StartPoint;
        public PointF EndPoint;
        public Shape()
        {
        }
    }
}