// ***********************************************************************
// Assembly         : HZH_Controls
// Created          : 2019-09-26
//
// ***********************************************************************
// <copyright file="UCFunnelChart.cs">
//     Copyright by Huang Zhenghui(黄正辉) All, QQ group:568015492 QQ:623128629 Email:623128629@qq.com
// </copyright>
//
// Blog: https://www.cnblogs.com/bfyx
// GitHub：https://github.com/kwwwvagaa/NetWinformControl
// gitee：https://gitee.com/kwwwvagaa/net_winform_custom_control.git
//
// If you use this code, please keep this note.
// ***********************************************************************
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.ComponentModel;

namespace HZH_Controls.Controls
{
    /// <summary>
    /// Class UCFunnelChart.
    /// Implements the <see cref="System.Windows.Forms.UserControl" />
    /// </summary>
    /// <seealso cref="System.Windows.Forms.UserControl" />
    public class UCFunnelChart : UserControl
    {
        /// <summary>
        /// The title
        /// </summary>
        private string title;
        /// <summary>
        /// Gets or sets the title.
        /// </summary>
        /// <value>The title.</value>
        [Browsable(true)]
        [Category("自定义")]
        [Description("获取或设置标题")]
        public string Title
        {
            get { return title; }
            set
            {
                title = value;
                ResetTitleSize();
                Invalidate();
            }
        }

        /// <summary>
        /// The title font
        /// </summary>
        private Font titleFont = new Font("微软雅黑", 12);
        /// <summary>
        /// Gets or sets the title font.
        /// </summary>
        /// <value>The title font.</value>
        [Browsable(true)]
        [Category("自定义")]
        [Description("获取或设置标题字体")]
        public Font TitleFont
        {
            get { return titleFont; }
            set
            {
                titleFont = value;
                ResetTitleSize();
                Invalidate();
            }
        }

        /// <summary>
        /// The title fore color
        /// </summary>
        private Color titleForeColor = Color.Black;
        /// <summary>
        /// Gets or sets the color of the title fore.
        /// </summary>
        /// <value>The color of the title fore.</value>
        [Browsable(true)]
        [Category("自定义")]
        [Description("获取或设置标题文字颜色")]
        public Color TitleForeColor
        {
            get { return titleForeColor; }
            set
            {
                titleForeColor = value;
                Invalidate();
            }
        }
        /// <summary>
        /// The items
        /// </summary>
        private FunelChartItem[] items;
        /// <summary>
        /// Gets or sets the items.
        /// </summary>
        /// <value>The items.</value>
        [Browsable(true)]
        [Category("自定义")]
        [Description("获取或设置项目")]
        public FunelChartItem[] Items
        {
            get { return items; }
            set
            {
                items = value;
                Invalidate();
            }
        }

        /// <summary>
        /// The direction
        /// </summary>
        private FunelChartDirection direction = FunelChartDirection.UP;
        /// <summary>
        /// Gets or sets the direction.
        /// </summary>
        /// <value>The direction.</value>
        [Browsable(true)]
        [Category("自定义")]
        [Description("获取或设置方向")]
        public FunelChartDirection Direction
        {
            get { return direction; }
            set
            {
                direction = value;
                Invalidate();
            }
        }

        /// <summary>
        /// The alignment
        /// </summary>
        private FunelChartAlignment alignment = FunelChartAlignment.Center;
        /// <summary>
        /// Gets or sets the alignment.
        /// </summary>
        /// <value>The alignment.</value>
        [Browsable(true)]
        [Category("自定义")]
        [Description("获取或设置对齐方式")]
        public FunelChartAlignment Alignment
        {
            get { return alignment; }
            set
            {
                alignment = value;
                Invalidate();
            }
        }

        /// <summary>
        /// The item text align
        /// </summary>
        private FunelChartAlignment itemTextAlign = FunelChartAlignment.Center;
        /// <summary>
        /// Gets or sets the item text align.
        /// </summary>
        /// <value>The item text align.</value>
        [Browsable(true)]
        [Category("自定义")]
        [Description("获取或设置文字位置")]
        public FunelChartAlignment ItemTextAlign
        {
            get { return itemTextAlign; }
            set
            {
                itemTextAlign = value;
                ResetWorkingRect();
                Invalidate();
            }
        }
        /// <summary>
        /// The show value
        /// </summary>
        private bool showValue = false;
        /// <summary>
        /// Gets or sets a value indicating whether [show value].
        /// </summary>
        /// <value><c>true</c> if [show value]; otherwise, <c>false</c>.</value>
        [Browsable(true)]
        [Category("自定义")]
        [Description("获取或设置是否显示值")]
        public bool ShowValue
        {
            get { return showValue; }
            set
            {
                showValue = value;
                Invalidate();
            }
        }


        /// <summary>
        /// The value format
        /// </summary>
        private string valueFormat = "0.##";
        /// <summary>
        /// Gets or sets the value format.
        /// </summary>
        /// <value>The value format.</value>
        [Browsable(true)]
        [Category("自定义")]
        [Description("获取或设置值格式化")]
        public string ValueFormat
        {
            get { return valueFormat; }
            set
            {
                valueFormat = value;
                Invalidate();
            }
        }

        /// <summary>
        /// The m rect working
        /// </summary>
        RectangleF m_rectWorking;
        /// <summary>
        /// The m title size
        /// </summary>
        SizeF m_titleSize = SizeF.Empty;
        /// <summary>
        /// The int split width
        /// </summary>
        int intSplitWidth = 1;

        /// <summary>
        /// Initializes a new instance of the <see cref="UCFunnelChart"/> class.
        /// </summary>
        public UCFunnelChart()
        {
            this.SetStyle(ControlStyles.AllPaintingInWmPaint, true);
            this.SetStyle(ControlStyles.DoubleBuffer, true);
            this.SetStyle(ControlStyles.ResizeRedraw, true);
            this.SetStyle(ControlStyles.Selectable, true);
            this.SetStyle(ControlStyles.SupportsTransparentBackColor, true);
            this.SetStyle(ControlStyles.UserPaint, true);
            this.FontChanged += UCFunnelChart_FontChanged;
            Font = new Font("微软雅黑", 8);

            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.None;
            this.SizeChanged += UCFunnelChart_SizeChanged;
            Size = new System.Drawing.Size(150, 150);
            items = new FunelChartItem[0];
            if (ControlHelper.IsDesignMode())
            {
                items = new FunelChartItem[5];
                for (int i = 0; i < 5; i++)
                {
                    items[i] = new FunelChartItem()
                    {
                        Text = "item" + i,
                        Value = 10 * (i + 1)
                    };
                }
            }
        }

        /// <summary>
        /// Handles the FontChanged event of the UCFunnelChart control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        void UCFunnelChart_FontChanged(object sender, EventArgs e)
        {
            ResetWorkingRect();
        }

        /// <summary>
        /// Handles the SizeChanged event of the UCFunnelChart control.
        /// </summary>
        /// <param name="sender">The source of the event.</param>
        /// <param name="e">The <see cref="EventArgs"/> instance containing the event data.</param>
        void UCFunnelChart_SizeChanged(object sender, EventArgs e)
        {
            ResetWorkingRect();
        }

        /// <summary>
        /// Resets the working rect.
        /// </summary>
        private void ResetWorkingRect()
        {
            if (itemTextAlign == FunelChartAlignment.Center)
            {
                m_rectWorking = new RectangleF(0, m_titleSize.Height == 0 ? 0 : (m_titleSize.Height + 10), this.Width, this.Height - (m_titleSize.Height == 0 ? 0 : (m_titleSize.Height + 10)));
            }
            else if (itemTextAlign == FunelChartAlignment.Left)
            {
                float fltMax = 0;
                if (items != null && items.Length > 0)
                {
                    using (Graphics g = this.CreateGraphics())
                    {
                        fltMax = items.Max(p => g.MeasureString(p.Text, Font).Width);
                    }
                }
                m_rectWorking = new RectangleF(fltMax, m_titleSize.Height == 0 ? 0 : (m_titleSize.Height + 10), this.Width - fltMax, this.Height - (m_titleSize.Height == 0 ? 0 : (m_titleSize.Height + 10)));
            }
            else
            {
                float fltMax = 0;
                if (items != null && items.Length > 0)
                {
                    using (Graphics g = this.CreateGraphics())
                    {
                        fltMax = items.Max(p => g.MeasureString(p.Text, Font).Width);
                    }
                }
                m_rectWorking = new RectangleF(0, m_titleSize.Height == 0 ? 0 : (m_titleSize.Height + 10), this.Width - fltMax, this.Height - (m_titleSize.Height == 0 ? 0 : (m_titleSize.Height + 10)));
            }
        }

        /// <summary>
        /// Resets the size of the title.
        /// </summary>
        private void ResetTitleSize()
        {
            if (string.IsNullOrEmpty(title))
            {
                m_titleSize = SizeF.Empty;
            }
            else
            {
                using (Graphics g = this.CreateGraphics())
                {
                    m_titleSize = g.MeasureString(title, titleFont);
                    m_titleSize.Height += 20;
                }
            }
            ResetWorkingRect();
        }

        /// <summary>
        /// 引发 <see cref="E:System.Windows.Forms.Control.Paint" /> 事件。
        /// </summary>
        /// <param name="e">包含事件数据的 <see cref="T:System.Windows.Forms.PaintEventArgs" />。</param>
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            var g = e.Graphics;
            g.SetGDIHigh();

            if (!string.IsNullOrEmpty(title))
            {
                g.DrawString(title, titleFont, new SolidBrush(titleForeColor), new RectangleF(0, 0, this.Width, m_titleSize.Height), new StringFormat() { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center });
            }

            if (items == null || items.Length <= 0)
            {
                g.DrawString("没有数据", Font, new SolidBrush(Color.Black), this.m_rectWorking, new StringFormat() { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center });
                return;
            }

            List<FunelChartItem> lstItems;
            if (direction == FunelChartDirection.UP)
            {
                lstItems = items.OrderBy(p => p.Value).ToList();
            }
            else
            {
                lstItems = items.OrderByDescending(p => p.Value).ToList();
            }

            List<RectangleF> lstRects = new List<RectangleF>();
            List<GraphicsPath> lstPaths = new List<GraphicsPath>();
            float maxValue = lstItems.Max(p => p.Value);
            float dblSplitHeight = m_rectWorking.Height / lstItems.Count;
            for (int i = 0; i < lstItems.Count; i++)
            {
                FunelChartItem item = lstItems[i];
                if (item.ValueColor == null || item.ValueColor == Color.Empty || item.ValueColor == Color.Transparent)
                    item.ValueColor = ControlHelper.Colors[i];

                switch (alignment)
                {
                    case FunelChartAlignment.Left:
                        lstRects.Add(new RectangleF(m_rectWorking.Left, m_rectWorking.Top + dblSplitHeight * i, item.Value / maxValue * m_rectWorking.Width, dblSplitHeight));
                        break;
                    case FunelChartAlignment.Center:
                        lstRects.Add(new RectangleF(m_rectWorking.Left + (m_rectWorking.Width - (item.Value / maxValue * m_rectWorking.Width)) / 2, m_rectWorking.Top + dblSplitHeight * i, item.Value / maxValue * m_rectWorking.Width, dblSplitHeight));
                        break;
                    case FunelChartAlignment.Right:
                        lstRects.Add(new RectangleF(m_rectWorking.Right - (item.Value / maxValue * m_rectWorking.Width), m_rectWorking.Top + dblSplitHeight * i, item.Value / maxValue * m_rectWorking.Width, dblSplitHeight));
                        break;
                }
            }

            for (int i = 0; i < lstRects.Count; i++)
            {
                var rect = lstRects[i];
                GraphicsPath path = new GraphicsPath();
                List<PointF> lstPoints = new List<PointF>();
                if (direction == FunelChartDirection.UP)
                {
                    switch (alignment)
                    {
                        case FunelChartAlignment.Left:
                            lstPoints.Add(new PointF(rect.Left, rect.Top));
                            if (i != 0)
                            {
                                lstPoints.Add(new PointF(lstRects[i - 1].Right, rect.Top));
                            }
                            break;
                        case FunelChartAlignment.Center:
                            if (i == 0)
                            {
                                lstPoints.Add(new PointF(rect.Left + rect.Width / 2, rect.Top));
                            }
                            else
                            {
                                lstPoints.Add(new PointF(lstRects[i - 1].Left, rect.Top));
                                lstPoints.Add(new PointF(lstRects[i - 1].Right, rect.Top));
                            }
                            break;
                        case FunelChartAlignment.Right:
                            if (i == 0)
                            {
                                lstPoints.Add(new PointF(rect.Right, rect.Top));
                            }
                            else
                            {
                                lstPoints.Add(new PointF(rect.Right - lstRects[i - 1].Width, rect.Top));
                                lstPoints.Add(new PointF(rect.Right, rect.Top));
                            }
                            break;
                    }
                    lstPoints.Add(new PointF(rect.Right, rect.Bottom - intSplitWidth));
                    lstPoints.Add(new PointF(rect.Left, rect.Bottom - intSplitWidth));
                }
                else
                {
                    lstPoints.Add(new PointF(rect.Left, rect.Top + intSplitWidth));
                    lstPoints.Add(new PointF(rect.Right, rect.Top + intSplitWidth));
                    switch (alignment)
                    {
                        case FunelChartAlignment.Left:
                            if (i == lstRects.Count - 1)
                            {
                                lstPoints.Add(new PointF(rect.Left, rect.Bottom));
                            }
                            else
                            {
                                lstPoints.Add(new PointF(lstRects[i + 1].Right, rect.Bottom));
                                lstPoints.Add(new PointF(rect.Left, rect.Bottom));
                            }
                            break;
                        case FunelChartAlignment.Center:
                            if (i == lstRects.Count - 1)
                            {
                                lstPoints.Add(new PointF(rect.Left + rect.Width / 2, rect.Bottom));
                            }
                            else
                            {
                                lstPoints.Add(new PointF(lstRects[i + 1].Right, rect.Bottom));
                                lstPoints.Add(new PointF(lstRects[i + 1].Left, rect.Bottom));
                            }
                            break;
                        case FunelChartAlignment.Right:
                            if (i == lstRects.Count - 1)
                            {
                                lstPoints.Add(new PointF(rect.Right, rect.Bottom));
                            }
                            else
                            {
                                lstPoints.Add(new PointF(rect.Right, rect.Bottom));
                                lstPoints.Add(new PointF(lstRects[i + 1].Left, rect.Bottom));
                            }
                            break;
                    }
                }
                path.AddLines(lstPoints.ToArray());
                path.CloseAllFigures();
                // g.DrawPath(new Pen(new SolidBrush(lstItems[i].ValueColor.Value)), path);
                g.FillPath(new SolidBrush(lstItems[i].ValueColor.Value), path);

                //写字
                if (itemTextAlign == FunelChartAlignment.Center)
                {
                    g.DrawString(lstItems[i].Text + (ShowValue ? lstItems[i].Value.ToString("\n" + valueFormat) : ""), Font, new SolidBrush((lstItems[i].TextForeColor == null || lstItems[i].TextForeColor == Color.Empty || lstItems[i].TextForeColor == Color.Transparent) ? Color.White : lstItems[i].TextForeColor.Value), rect, new StringFormat() { Alignment = StringAlignment.Center, LineAlignment = StringAlignment.Center });
                }
                else if (itemTextAlign == FunelChartAlignment.Left)
                {
                    g.DrawString(lstItems[i].Text + (ShowValue ? lstItems[i].Value.ToString("\n" + valueFormat) : ""), Font, new SolidBrush((lstItems[i].TextForeColor == null || lstItems[i].TextForeColor == Color.Empty || lstItems[i].TextForeColor == Color.Transparent) ? lstItems[i].ValueColor.Value : lstItems[i].TextForeColor.Value), new RectangleF(0, rect.Top, rect.Left, rect.Height), new StringFormat() { Alignment = StringAlignment.Far, LineAlignment = StringAlignment.Center });
                    g.DrawLine(new Pen(new SolidBrush((lstItems[i].TextForeColor == null || lstItems[i].TextForeColor == Color.Empty || lstItems[i].TextForeColor == Color.Transparent) ? lstItems[i].ValueColor.Value : lstItems[i].TextForeColor.Value)), rect.Left, rect.Top + rect.Height / 2, rect.Left + rect.Width / 2, rect.Top + rect.Height / 2);
                }
                else
                {
                    g.DrawString(lstItems[i].Text + (ShowValue ? lstItems[i].Value.ToString("\n" + valueFormat) : ""), Font, new SolidBrush((lstItems[i].TextForeColor == null || lstItems[i].TextForeColor == Color.Empty || lstItems[i].TextForeColor == Color.Transparent) ? lstItems[i].ValueColor.Value : lstItems[i].TextForeColor.Value), new RectangleF(rect.Right, rect.Top, this.Width - rect.Right, rect.Height), new StringFormat() { Alignment = StringAlignment.Near, LineAlignment = StringAlignment.Center });
                    g.DrawLine(new Pen(new SolidBrush((lstItems[i].TextForeColor == null || lstItems[i].TextForeColor == Color.Empty || lstItems[i].TextForeColor == Color.Transparent) ? lstItems[i].ValueColor.Value : lstItems[i].TextForeColor.Value)), rect.Left + rect.Width / 2, rect.Top + rect.Height / 2, rect.Right, rect.Top + rect.Height / 2);
                }
            }
        }
    }
}