using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
using OpenCvSharp;

namespace PaintDotNet.CustomControl
{
    public partial class HistogramControl : UserControl
    {
        /// <summary>
        /// panel画板
        /// </summary>
        private PanelEx panelEx1;
        /// <summary>
        /// 控件的宽
        /// </summary>
        private int width;
        /// <summary>
        /// 控件的高
        /// </summary>
        private int height;
        /// <summary>
        /// 区间1的起止值
        /// </summary>
        private int start = 0, end = 0;
        /// <summary>
        /// 区间2的起止值
        /// </summary>
        private int start1 = 0, end1 = 0;
        /// <summary>
        /// 画笔
        /// </summary>
        private Pen pen = new Pen(Color.Red);
        /// <summary>
        /// 直方图的bitmap
        /// </summary>
        private Bitmap bitmap;
        /// <summary>
        /// 1个区间/2个区间
        /// </summary>
        private int flag = 1;
        /// <summary>
        /// 鼠标按下标志
        /// </summary>
        private bool press = false;
        /// <summary>
        /// 标记鼠标按下的时候在那根线上 1、2、3、4
        /// </summary>
        private int x = 0;
        /// <summary>
        /// 中间的
        /// </summary>
        private GraphicsPath path1, path2;
        
        public int Flag
        {
            get
            {
                return flag;
            }
            set
            {
                this.flag = value;
                this.panelEx1.Refresh();
            }
        }

        /// <summary>
        /// 公开的事件，第一条线拖拽的事件
        /// </summary>
        public event EventHandler<EventArgs<int>> DragOneEventActionFinish;
        private void OnDragOneEventActionFinish(int start)
        {
            if (DragOneEventActionFinish != null)
            {
                DragOneEventActionFinish(this, new EventArgs<int>(start));
            }
        }

        public event EventHandler<EventArgs<int>> DragTwoEventActionFinish;
        private void OnDragTwoEventActionFinish(int end)
        {
            if (DragTwoEventActionFinish != null)
            {
                DragTwoEventActionFinish(this, new EventArgs<int>(end));
            }
        }

        public event EventHandler<EventArgs<int>> DragThreeEventActionFinish;
        private void OnDragThreeEventActionFinish(int start1)
        {
            if (DragThreeEventActionFinish != null)
            {
                DragThreeEventActionFinish(this, new EventArgs<int>(start1));
            }
        }

        public event EventHandler<EventArgs<int>> DragFourEventActionFinish;
        private void OnDragFourEventActionFinish(int start1)
        {
            if (DragFourEventActionFinish != null)
            {
                DragFourEventActionFinish(this, new EventArgs<int>(start1));
            }
        }

        public event EventHandler<EventArgs<int[]>> DragFiveEventActionFinish;
        private void OnDragFiveEventActionFinish(int[] startend)
        {
            if (DragFiveEventActionFinish != null)
            {
                DragFiveEventActionFinish(this, new EventArgs<int[]>(startend));
            }
        }

        public event EventHandler<EventArgs<int[]>> DragSixEventActionFinish;
        private void OnDragSixEventActionFinish(int[] start1end1)
        {
            if (DragSixEventActionFinish != null)
            {
                DragSixEventActionFinish(this, new EventArgs<int[]>(start1end1));
            }
        }

        public HistogramControl()
        {
            InitializeComponent();
            
            this.panelEx1.Paint += new PaintEventHandler(this.panelEx_Paint);
            this.panelEx1.MouseDown += new MouseEventHandler(this.panelEx_MouseDown);
            this.panelEx1.MouseMove += new MouseEventHandler(this.panelEx_MouseMove);
            this.panelEx1.MouseUp += new MouseEventHandler(this.panelEx_MouseUp);
        }

        int oldx = 0;

        /// <summary>
        /// 鼠标按下事件,判断是否点在了线上
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void panelEx_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                if (flag == 1 || flag == 2)
                {
                    if ((e.X > start-5 && e.X < start + 5) || (e.X > end-5 && e.X < end + 5))
                    {
                        x = (e.X > end - 5 && e.X < end + 5) ? 2 : 1;
                        press = true;
                    }
                    if(new Region(path1).IsVisible(e.X, e.Y))
                    {
                        x = 5;
                        oldx = e.X;
                        press = true;
                    }
                }

                if (flag == 2)
                {
                    if ((e.X > start1 - 5 && e.X < start1 + 5) || (e.X > end1 - 5 && e.X < end1 + 5))
                    {
                        x = (e.X > end1 - 5 && e.X < end1 + 5) ? 4 : 3;
                        press = true;
                    }
                    if (new Region(path2).IsVisible(e.X, e.Y))
                    {
                        x = 6;
                        oldx = e.X;
                        press = true;
                    }
                }
            }
        }

        /// <summary>
        /// 鼠标移动事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void panelEx_MouseMove(object sender, MouseEventArgs e)
        {
            if((e.X > start - 5 && e.X < start + 5) || (e.X > end - 5 && e.X < end + 5) || (e.X > start1 - 5 && e.X < start1 + 5) || (e.X > end1 - 5 && e.X < end1 + 5))
            {
                this.Cursor = Cursors.VSplit;
            }
            else
            {
                if ((path1!=null && new Region(path1).IsVisible(e.X, e.Y)))
                {
                    this.Cursor = Cursors.Hand;
                }
                else if ((path2 != null && new Region(path2).IsVisible(e.X, e.Y)))
                {
                    this.Cursor = Cursors.Hand;
                }
                else if (press)
                {
                    this.Cursor = Cursors.VSplit;
                }
                else
                {
                    this.Cursor = Cursors.Default;
                }
            }

            if(e.Button == MouseButtons.Left && press && e.X>=0 && e.X<=width)
            {
                switch(x)
                {
                    case 1:
                        this.start = e.X;
                        if (this.start > this.end) this.start = this.end;
                        break;

                    case 2:
                        this.end = e.X;
                        if (this.end < this.start) this.end = this.start;
                        break;

                    case 3:
                        this.start1 = e.X;
                        if (this.start1 > this.end1) this.start1 = this.end1;
                        break;

                    case 4:
                        this.end1 = e.X;
                        if (this.end1 < this.start1) this.end1 = this.start1;
                        break;

                    case 5:
                        this.start += -oldx + e.X;
                        this.end += -oldx + e.X;
                        if (this.start < 0) this.start = 0;
                        if (this.end > width) this.end = width;
                        break;

                    case 6:
                        this.start1 += -oldx + e.X;
                        this.end1 += -oldx + e.X;
                        if (this.start1 < 0) this.start1 = 0;
                        if (this.end1 > width) this.end1 = width;
                        break;
                }
                oldx = e.X;
                this.panelEx1.Refresh();
            }
        }

        /// <summary>
        /// 鼠标抬起事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void panelEx_MouseUp(object sender, MouseEventArgs e)
        {
            if (this.press)
            {
                switch(this.x)
                {
                    case 1:
                        OnDragOneEventActionFinish(Convert.ToInt32(this.start * 1f * 255 / width));
                        break;
                    case 2:
                        OnDragTwoEventActionFinish(Convert.ToInt32(this.end * 1f * 255 / width));
                        break;
                    case 3:
                        OnDragThreeEventActionFinish(Convert.ToInt32(this.start1 * 1f * 255 / width));
                        break;
                    case 4:
                        OnDragFourEventActionFinish(Convert.ToInt32(this.end1 * 1f * 255 / width));
                        break;
                    case 5:
                        OnDragFiveEventActionFinish(new int[] { Convert.ToInt32(this.end * 1f * 255 / width), Convert.ToInt32(this.start * 1f * 255 / width) });
                        //OnDragTwoEventActionFinish(Convert.ToInt32(this.end * 1f * 255 / width));
                        //OnDragOneEventActionFinish(Convert.ToInt32(this.start * 1f * 255 / width));
                        break;
                    case 6:
                        OnDragSixEventActionFinish(new int[] { Convert.ToInt32(this.end1 * 1f * 255 / width), Convert.ToInt32(this.start1 * 1f * 255 / width) });
                        //OnDragFourEventActionFinish(Convert.ToInt32(this.end1 * 1f * 255 / width));
                        //OnDragThreeEventActionFinish(Convert.ToInt32(this.start1 * 1f * 255 / width));
                        break;
                }
            }
            this.press = false;
            this.x = 0;
        }

        /// <summary>
        /// 绘制事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void panelEx_Paint(object sender, PaintEventArgs e)
        {
            if (bitmap != null)
            {
                e.Graphics.DrawImage(bitmap, 0, 0, width, height);
            }
            if(flag==1 || flag==2)
            {
                e.Graphics.DrawLine(pen, new PointF(start, 0), new PointF(start, height));
                e.Graphics.DrawLine(pen, new PointF(end, 0), new PointF(end, height));
                DrawHandle(start, end, e.Graphics, 1);
            }
            if (flag == 2)
            {
                e.Graphics.DrawLine(pen, new PointF(start1, 0), new PointF(start1, height));
                e.Graphics.DrawLine(pen, new PointF(end1, 0), new PointF(end1, height));
                DrawHandle(start1, end1, e.Graphics, 2);
            }
        }

        public void UpdateVerticalBarWithOneScope(int start, int end)
        {
            this.flag = 1;
            this.start = Convert.ToInt32(start * width * 1f / 255);
            this.end = Convert.ToInt32(end * width * 1f / 255);
            this.panelEx1.Refresh();
        }

        public void UpdateVerticalBarWithTwoScope(int start, int end, int start1, int end1)
        {
            this.flag = 2;
            this.start = Convert.ToInt32(start * width * 1f / 255);
            this.end = Convert.ToInt32(end * width * 1f / 255);
            this.start1 = Convert.ToInt32(start1 * width * 1f / 255);
            this.end1 = Convert.ToInt32(end1 * width * 1f / 255);
            this.panelEx1.Refresh();
        }

        private void InitializeComponent()
        {
            this.panelEx1 = new PaintDotNet.PanelEx();
            this.SuspendLayout();
            // 
            // panelEx1
            // 
            this.panelEx1.BackColor = System.Drawing.SystemColors.ActiveBorder;
            this.panelEx1.Dock = System.Windows.Forms.DockStyle.Fill;
            this.panelEx1.HideHScroll = false;
            this.panelEx1.HideVScroll = false;
            this.panelEx1.IgnoreSetFocus = false;
            this.panelEx1.Location = new System.Drawing.Point(0, 0);
            this.panelEx1.Margin = new System.Windows.Forms.Padding(0);
            this.panelEx1.Name = "panelEx1";
            this.panelEx1.ScrollPosition = new System.Drawing.Point(0, 0);
            this.panelEx1.Size = new System.Drawing.Size(255, 150);
            this.panelEx1.TabIndex = 0;
            // 
            // HistogramControl
            // 
            this.Controls.Add(this.panelEx1);
            this.Name = "HistogramControl";
            this.Size = new System.Drawing.Size(255, 150);
            this.ResumeLayout(false);

        }

        /// <summary>
        /// 绘制直方图
        /// </summary>
        /// <param name="imageMat">imageMat</param>
        /// <param name="isGray">是否绘制单通道灰度图</param>
        /// <param name="width">需要绘制的直方图宽度</param>
        /// <param name="height">需要绘制的直方图高度</param>
        /// <param name="channel">isGray为false的时候生效，绘制RGB三通道的直方图的时候，0全部绘制，1B，2G，3R</param>
        public void CreateHistogram(OpenCvSharp.Mat imageMat, bool isGray, int width, int height, int channel)
        {
            this.width = width;
            this.height = height;
            //Mat mat = OpenCvSharp.Extensions.BitmapConverter.ToMat(bitmap);
            if (isGray)
            {
                this.DrawGrayHistogram(imageMat.CvtColor(ColorConversionCodes.BGRA2GRAY));
            }
            else
            {
                this.DrawRGBHistogram(imageMat.Clone(), channel);
            }
        }

        private void DrawGrayHistogram(Mat mat)
        {
            //配置输出的结果存储的 空间 ，用MatND类型来存储结果
            Mat hist = new Mat();
            //设置计算直方图的维度
            int dims = 1;
            //直方图的每一个维度的柱条的数目(就是将数值分组，共有多少组)
            int[] histSize = { 255 };
            Rangef[] pranges = new Rangef[1];//一个通道，范围
            pranges[0] = new Rangef(0.0F, 256.0F);
            //6--计算直方图
            Cv2.CalcHist(new Mat[1] { mat }, new int[] { 0 }, new Mat(), hist, dims, histSize, pranges);

            int hist_w = width;
            int hist_h = height;
            int nHistSize = 256;
            double bin_w = (double)hist_w / nHistSize;    //区间
            Mat histImage = new Mat(hist_h, hist_w, MatType.CV_8UC3, Scalar.All(255));//创建一个黑底的图像，为了可以显示彩色，所以该绘制图像是一个8位的3通道图像
            Cv2.Normalize(hist, hist, 0, histImage.Rows-10, NormTypes.MinMax, -1, new Mat());

            this.bitmap = OpenCvSharp.Extensions.BitmapConverter.ToBitmap(histImage);
            Graphics graphics = Graphics.FromImage(this.bitmap);

            //在直方图画布上画出直方图
            for (int i = 1; i < nHistSize-1; i++)
            {
                System.Drawing.PointF point1 = new System.Drawing.PointF((float)(bin_w * (i - 1)), (float)(hist_h - 5 - Math.Round(hist.At<float>(i - 1))));
                System.Drawing.PointF point2 = new System.Drawing.PointF((float)(bin_w * (i)), (float)(hist_h - 2 - Math.Round(hist.At<float>(i))));
                graphics.SmoothingMode = SmoothingMode.AntiAlias;
                graphics.DrawLine(new Pen(Color.FromArgb(100, 100, 100)), point1, point2);
                //Cv2.Line(histImage, point1, point2, new Scalar(100, 100, 100), 1, LineTypes.AntiAlias, 0);

                /*OpenCvSharp.Point point1 = new OpenCvSharp.Point(bin_w * (i - 1), hist_h - 5 - Math.Round(hist.At<float>(i - 1)));
                OpenCvSharp.Point point2 = new OpenCvSharp.Point(bin_w * (i), hist_h - 2 - Math.Round(hist.At<float>(i)));
                Cv2.Line(histImage, point1, point2, new Scalar(100, 100, 100), 1, LineTypes.AntiAlias, 0);*/
            }
            //this.bitmap = OpenCvSharp.Extensions.BitmapConverter.ToBitmap(histImage);
            this.panelEx1.Refresh();
        }

        private void DrawRGBHistogram(Mat mat, int channel)
        {
            Mat[] src = mat.Split();
            //配置输出的结果存储的 空间 ，用MatND类型来存储结果
            Mat[] hists = new Mat[] { new Mat(), new Mat(), new Mat() };

            //设置计算直方图的维度
            int dims = 1;
            //直方图的每一个维度的柱条的数目(就是将数值分组，共有多少组)
            int[] histSize = { 255 };
            Rangef[] pranges = new Rangef[1];//一个通道，范围
            pranges[0] = new Rangef(0.0F, 256.0F);
            //6--计算直方图
            Cv2.CalcHist(new Mat[] { src[0] }, new int[] { 0 }, new Mat(), hists[0], dims, histSize, pranges);
            Cv2.CalcHist(new Mat[] { src[1] }, new int[] { 0 }, new Mat(), hists[1], dims, histSize, pranges);
            Cv2.CalcHist(new Mat[] { src[2] }, new int[] { 0 }, new Mat(), hists[2], dims, histSize, pranges);

            int hist_w = width;
            int hist_h = height;
            int nHistSize = 256;
            double bin_w = (double)hist_w / nHistSize;    //区间
            Mat histImage = new Mat(hist_h, hist_w, MatType.CV_8UC3, Scalar.All(255));//创建一个黑底的图像，为了可以显示彩色，所以该绘制图像是一个8位的3通道图像
            Cv2.Normalize(hists[0], hists[0], 0, histImage.Rows - 10, NormTypes.MinMax, -1, new Mat());
            Cv2.Normalize(hists[1], hists[1], 0, histImage.Rows - 10, NormTypes.MinMax, -1, new Mat());
            Cv2.Normalize(hists[2], hists[2], 0, histImage.Rows - 10, NormTypes.MinMax, -1, new Mat());

            //在直方图画布上画出直方图
            for (int i = 1; i < nHistSize-1; i++)
            {
                if(channel == 0 || channel == 3)
                    Cv2.Line(histImage, new OpenCvSharp.Point(bin_w * (i - 1), hist_h - 5 - Math.Round(hists[0].At<float>(i - 1))), new OpenCvSharp.Point(bin_w * (i), hist_h - 5 - Math.Round(hists[0].At<float>(i))), new Scalar(255, 0, 0), 1, LineTypes.AntiAlias, 0);
                if(channel == 0 || channel == 2)
                    Cv2.Line(histImage, new OpenCvSharp.Point(bin_w * (i - 1), hist_h - 5 - Math.Round(hists[1].At<float>(i - 1))), new OpenCvSharp.Point(bin_w * (i), hist_h - 5 - Math.Round(hists[1].At<float>(i))), new Scalar(0, 255, 0), 1, LineTypes.AntiAlias, 0);
                if(channel == 0 || channel == 1)
                    Cv2.Line(histImage, new OpenCvSharp.Point(bin_w * (i - 1), hist_h - 5 - Math.Round(hists[2].At<float>(i - 1))), new OpenCvSharp.Point(bin_w * (i), hist_h - 5 - Math.Round(hists[2].At<float>(i))), new Scalar(0, 0, 255), 1, LineTypes.AntiAlias, 0);
            }
            this.bitmap = OpenCvSharp.Extensions.BitmapConverter.ToBitmap(histImage);
            this.panelEx1.Refresh();
        }

        /// <summary>
        /// 绘制直线间的形状
        /// </summary>
        /// <param name="s">x轴起点</param>
        /// <param name="e">x轴终点</param>
        /// <param name="g">Graphics</param>
        private void DrawHandle(int s, int e, Graphics g, int type)
        {
            float v4 = height / 4;
            float h4 = (e - s) / 4;
            float h2 = (e - s) / 2;

            {
                PointF p1 = new PointF(s + h4, height / 2);
                PointF p2 = new PointF(s + (h4 * 3), height / 2);
                PointF p3 = new PointF(s + h2, v4);
                PointF p4 = new PointF(s + h2, v4 * 3);

                g.DrawLine(pen, new PointF(s, height / 2), p1);
                g.DrawLine(pen, p2, new PointF(e, height / 2));

                PointF[] points = new PointF[4];
                points[0] = p1;
                points[1] = p3;
                points[2] = p2;
                points[3] = p4;

                g.DrawLine(pen, p1, p3);
                g.DrawLine(pen, p2, p3);
                g.DrawLine(pen, p1, p4);
                g.DrawLine(pen, p2, p4);

                if(type==1)
                {
                    path1 = new GraphicsPath();
                    path1.AddPolygon(points);
                }
                else if(type == 2)
                {
                    path2 = new GraphicsPath();
                    path2.AddPolygon(points);
                }
            }
        }
    }
}