/// <summary>
    /// 菱形定義
    /// </summary>
    public class LozengeShapeV2 : ShapeBase
    {
        public override void Draw(Graphics g)
        {
            var x2 = Rect.X;
            var y2 = Rect.Y;
            var w2 = Rect.Width;
            var h2 = Rect.Height;

            var x = x2 + w2 / 2;
            var y = y2 + h2 / 2;

            //左-上-右-下
            var r0 = new Point(x2, y);
            var r1 = new Point(x, y2);
            var r2 = new Point(x2 + w2, y);
            var r3 = new Point(x, y2 + h2);

            var path = new GraphicsPath();
            path.Reset();
            path.AddPolygon(new Point[]{ r0,r1,r2,r3});
            path.CloseFigure();
            g.FillPath(new SolidBrush(BackgroundColor), path);

            g.DrawString(Text, TextFont, new SolidBrush(FontColor), Rect,
                new StringFormat() { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center });
        }

    }
	
	
    /// <summary>
    /// 平行四邊形定義
    /// </summary>
    public class ParallelogramShapeV2 : ShapeBase
    {
        public override void Draw(Graphics g)
        {
            var x2 = Rect.X;
            var y2 = Rect.Y;
            var w2 = Rect.Width;
            var h2 = Rect.Height;

            var f = w2 / 5;

            //左-上-右-下
            var r0 = new Point(x2 + f, y2);
            var r1 = new Point(x2 + w2, y2);
            var r2 = new Point(x2 + w2 - f, y2 + h2);
            var r3 = new Point(x2, y2 + h2);

            var path = new GraphicsPath();
            path.Reset();
            path.AddPolygon(new Point[]{ r0,r1,r2,r3});
            path.CloseFigure();
            g.FillPath(new SolidBrush(BackgroundColor), path);

            g.DrawString(Text, TextFont, new SolidBrush(FontColor), Rect,
                new StringFormat() { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center });
        }

    }
	
	
    /// <summary>
    /// 圓角矩形定義
    /// </summary>
    public class RoundRectShapeV2 : ShapeBase
    {
        public override void Draw(Graphics g)
        {
            float diameter = 20;

            var path = new GraphicsPath();
            path.Reset();

            RectangleF arc = new RectangleF(Rect.X, Rect.Y, diameter, diameter);
           
            // 左上角
            path.AddArc(arc, 180, 90);

            // 右上角
            arc.X = Rect.Right - diameter;
            path.AddArc(arc, 270, 90);

            // 右下角
            arc.Y = Rect.Bottom - diameter;
            path.AddArc(arc, 0, 90);

            // 左下角
            arc.X = Rect.Left;
            path.AddArc(arc, 90, 90);


            path.CloseFigure();
            g.FillPath(new SolidBrush(BackgroundColor), path);

            g.DrawString(Text, TextFont, new SolidBrush(FontColor), Rect,
                new StringFormat() { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center });
        }

    }

using Elements;
using Elements.Links;
using Elements.Shapes;
using FlowChartCanvas;
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 FlowChartDemo
{
    public partial class FormDemo07V4 : FormBase
    {
        public FormDemo07V4()
        {
            InitializeComponent();
            DemoTitle = "第09節隨課Demo  Part4";
            DemoNote = "效果：所有形狀內文本居中顯示。";

            //添加畫布控件
            _fcc = new FCCanvasV1();
            _fcc.FCC_LinkColor += _fcc_FCC_LinkColor;
            _fcc.FCC_LinkState += _fcc_FCC_LinkState;
            _fcc.Dock = DockStyle.Fill;
            panel1.Controls.Add(_fcc);

        }

        private void _fcc_FCC_LinkState(string obj)
        {
            toolStripStatusLabel1.Text = obj;
        }

        private Color _fcc_FCC_LinkColor()
        {
            return GetColor(_linkColorIndex++);
        }

        FCCanvasV1 _fcc;

        /// <summary>
        /// 形狀顏色序號
        /// </summary>
        int _shapeColorIndex = 0;
        /// <summary>
        /// 連線顏色序號
        /// </summary>
        int _linkColorIndex = 0;
               
        /// <summary>
        /// 獲取不同的背景顏色
        /// </summary>
        /// <param name="i"></param>
        /// <returns></returns>
        Color GetColor(int i)
        {
            switch (i)
            {
                case 0: return Color.Red;
                case 1: return Color.Green;
                case 2: return Color.Blue;
                case 3: return Color.Orange;
                case 4: return Color.Purple;
                default: return Color.Red;
            }
        }

        //注：文章中說明：再次抽象

        /// <summary>
        /// 創建形狀
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="shapeText"></param>
        /// <returns></returns>
        T CreateShape<T>(string shapeText) where T:ShapeBase
        {
            var t = Activator.CreateInstance<T>();
            t.Id = shapeText + Guid.NewGuid().ToString();
            t.Rect = new Rectangle()
            {
                X = 50,
                Y = 50,
                Width = 100,
                Height = 100,
            };
            t.FontColor = Color.White;
            t.BackgroundColor = GetColor(_shapeColorIndex++);
            t.Text = shapeText + _shapeColorIndex;
            t.TextFont = Font;
            return t;
        }

        /// <summary>
        /// 創建指定類型的形狀并添加到當前流程圖畫布中。
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="shapeText"></param>
        void CreateShapeAndAddToFCCanvas<T>(string shapeText) where T : ShapeBase
        {
            var sp = CreateShape<T>(shapeText);

            _fcc.FCC_AddShapes(new List<ShapeBase>() { sp });
            _fcc.FCC_Refresh();
        }

        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            CreateShapeAndAddToFCCanvas<RectShapeV2>("矩形");
        }

        private void toolStripButton4_Click(object sender, EventArgs e)
        {
            CreateShapeAndAddToFCCanvas<EllipseShapeV2>("圓形");
        }

        private void toolStripButton5_Click(object sender, EventArgs e)
        {
            CreateShapeAndAddToFCCanvas<LozengeShapeV2>("菱形");
        }

        private void toolStripButton6_Click(object sender, EventArgs e)
        {
            CreateShapeAndAddToFCCanvas<ParallelogramShapeV2>("平行四邊形");
        }

        private void toolStripButton7_Click(object sender, EventArgs e)
        {
            CreateShapeAndAddToFCCanvas<RoundRectShapeV2>("圓角矩形");
        }

        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            _fcc.FCC_StartLink();
        }

        private void toolStripButton3_Click(object sender, EventArgs e)
        {
            _fcc.FCC_StopLink();
        }

    }


}