using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using XHWK.Model;

namespace XHWK.WKTool
{
    /// <summary>
    /// 录屏画板
    /// </summary>
    public partial class PracticeWindow : Window
    {
        //声明一个 DrawingAttributes 类型的变量  
        DrawingAttributes drawingAttributes;

        private ViewModel viewModel;
        /// <summary>
        /// 0 画笔 1 矩形 2 圆形 
        /// </summary>
        private int flg = 0;
        /// <summary>
        /// 当前画笔颜色
        /// </summary>
        Color Colour=Colors.Red;
        /// <summary>
        /// 当前画笔宽
        /// </summary>
        private int Wit = 2;
        /// <summary>
        /// 当前画笔高
        /// </summary>
        private int Hei = 2;
        public PracticeWindow()
        {
            InitializeComponent();
        }
        public void Initialize(string _imgPath)
        {
            flg = 0;
            blackboard_canvas.Strokes.Clear();
            blackboard_canvas.UseCustomCursor = true;
            //blackboard_canvas.EditingMode = InkCanvasEditingMode.EraseByStroke;
            if (File.Exists(_imgPath))
            {
                imgCanvas.Source = new BitmapImage(new Uri(_imgPath));
            }




            //创建 DrawingAttributes 类的一个实例  
            drawingAttributes = new DrawingAttributes();

            //drawingAttributes.StylusTip = StylusTip.Rectangle;
            //drawingAttributes.IsHighlighter = false;
            //drawingAttributes.IgnorePressure = true;



            ////将 InkCanvas 的 DefaultDrawingAttributes 属性的值赋成创建的 DrawingAttributes 类的对象的引用  
            ////InkCanvas 通过 DefaultDrawingAttributes 属性来获取墨迹的各种设置，该属性的类型为 DrawingAttributes 型  
            blackboard_canvas.DefaultDrawingAttributes = drawingAttributes;
            Pen();
            //blackboard_canvas.Cursor = Cursors.Pen;


            //Cursor cus = new Cursor(@"G:\06.cur");

            //blackboard_canvas.Cursor = cus;

            viewModel = new ViewModel
            {
                InkStrokes = new StrokeCollection(),
            };

            DataContext = viewModel;
        }
        /// <summary>
        /// 画笔颜色事件 白色
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void White()
        {
            //flg = 0;
            drawingAttributes.Color = Colors.White;
            Colour= Colors.White; 
        }
        /// <summary>
        /// 画笔颜色事件 红色
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void Red()
        {
            //flg = 0;
            //设置 DrawingAttributes 的 Color 属性设置颜色  
            drawingAttributes.Color = Colors.Red;
            Colour = Colors.Red;
        }
        /// <summary>
        /// 画笔颜色事件 黑色
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void Gray()
        {
            //flg = 0;
            drawingAttributes.Color = Colors.Black;
            Colour = Colors.Black;
        }
        /// <summary>
        /// 画笔颜色事件 青色
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void CyanBlue()
        {
            //flg = 0;
            drawingAttributes.Color = Colors.LimeGreen;
            Colour = Colors.LimeGreen;
        }
        /// <summary>
        /// 画笔颜色事件 黄色
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void Yellow()
        {
            //flg = 0;
            drawingAttributes.Color = Colors.Gold;
            Colour = Colors.Gold;
        }
        /// <summary>
        /// 画笔颜色事件 蓝色
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void Blue()
        {
            //flg = 0;
            drawingAttributes.Color = Colors.DeepSkyBlue;
            Colour = Colors.DeepSkyBlue;
        }
        /// <summary>
        /// 画笔粗细事件 细
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void Fine()
        {
            //flg = 0;
            drawingAttributes.Width = 1;
            drawingAttributes.Height = 1;
            Wit = 1;
            Hei = 1;
        }
        /// <summary>
        /// 画笔粗细事件 中
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void In()
        {
            //flg = 0;
            drawingAttributes.Width = 3;
            drawingAttributes.Height = 3;
            Wit = 3;
            Hei = 3;

        }
        /// <summary>
        /// 画笔粗细事件 粗
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void Crude()
        {
            //flg = 0;
            drawingAttributes.Width = 5;
            drawingAttributes.Height = 5;
            Wit = 5;
            Hei = 5;
        }
        /// <summary>
        /// 橡皮
        /// </summary>
        public void Eraser() 
        {
            flg = 0;
            //this.type = ZPenType.Erase;
            blackboard_canvas.UseCustomCursor = false;
            blackboard_canvas.EditingMode = InkCanvasEditingMode.EraseByPoint;
            blackboard_canvas.EraserShape = new EllipseStylusShape(64, 64, 0);
        }
        /// <summary>
        /// 画笔
        /// </summary>
        public void Pen()
        {
            flg = 0;
            blackboard_canvas.EditingMode = InkCanvasEditingMode.Ink;
            blackboard_canvas.UseCustomCursor = true;
            drawingAttributes.FitToCurve = true;
            drawingAttributes.IgnorePressure = false;
        
            blackboard_canvas.Cursor = Cursors.Pen;
        }
        /// <summary>
        /// 圆
        /// </summary>
        public void Round()
        {
            flg = 2;
            drawingAttributes = new DrawingAttributes
            {
                Color = Colour,
                Width = Wit,
                Height = Hei,
                StylusTip = StylusTip.Rectangle,
                //FitToCurve = true,
                IsHighlighter = false,
                IgnorePressure = true,

            };
            blackboard_canvas.DefaultDrawingAttributes = drawingAttributes;
            blackboard_canvas.EditingMode = InkCanvasEditingMode.None;
            blackboard_canvas.Cursor = Cursors.Cross;
        }
        /// <summary>
        /// 矩形
        /// </summary>
        public void Rectangle()
        {
            flg = 1;
            drawingAttributes = new DrawingAttributes
            {
                Color = Colour,
                Width = Wit,
                Height = Hei,
                StylusTip = StylusTip.Rectangle,
                //FitToCurve = true,
                IsHighlighter = false,
                IgnorePressure = true,

            };
            blackboard_canvas.DefaultDrawingAttributes = drawingAttributes;
            blackboard_canvas.EditingMode = InkCanvasEditingMode.None;
            blackboard_canvas.Cursor = Cursors.Cross;
        }
        private System.Windows.Point iniP;
        private void blackboard_canvas_MouseDown(object sender, MouseButtonEventArgs e)
        {
            if (flg != 0)
            {
                if (e.LeftButton == MouseButtonState.Pressed)
                {
                    iniP = e.GetPosition(blackboard_canvas);
                }
            }
        }
        Stroke StrokeRound;
        Stroke StrokeRectangle; 
        private void blackboard_canvas_MouseMove(object sender, MouseEventArgs e)
        {
            if(flg!=0)
            {
                if (e.LeftButton == MouseButtonState.Pressed)
                {
                    // Draw square
                    if (flg == 1)
                    {
                        System.Windows.Point endP = e.GetPosition(blackboard_canvas);
                        List<System.Windows.Point> pointList = new List<System.Windows.Point>
                    {
                        new System.Windows.Point(iniP.X, iniP.Y),
                        new System.Windows.Point(iniP.X, endP.Y),
                        new System.Windows.Point(endP.X, endP.Y),
                        new System.Windows.Point(endP.X, iniP.Y),
                        new System.Windows.Point(iniP.X, iniP.Y),
                    };
                        //Stroke stroke1 = new Stroke(drawingAttributesRound);
                        StylusPointCollection point = new StylusPointCollection(pointList);
                        Stroke stroke = new Stroke(point)
                        {
                            DrawingAttributes = blackboard_canvas.DefaultDrawingAttributes.Clone()
                        };
                        if(StrokeRectangle!=null)
                        {
                            viewModel.InkStrokes.Remove(StrokeRectangle);
                        }
                        StrokeRectangle = stroke;

                        viewModel.InkStrokes.Add(stroke);
                    }
                    // Draw Eclipse
                    else if (flg == 2)
                    {
                        System.Windows.Point endP = e.GetPosition(blackboard_canvas);
                        List<System.Windows.Point> pointList = GenerateEclipseGeometry(iniP, endP);
                        StylusPointCollection point = new StylusPointCollection(pointList);
                        Stroke stroke = new Stroke(point)
                        {
                            DrawingAttributes = blackboard_canvas.DefaultDrawingAttributes.Clone()
                        };
                        //viewModel.InkStrokes.Clear();
                        if(StrokeRound!=null)
                        {
                            viewModel.InkStrokes.Remove(StrokeRound);
                        }
                        StrokeRound = stroke;
                        viewModel.InkStrokes.Add(stroke);
                    }
                }
            }
        }
        private List<System.Windows.Point> GenerateEclipseGeometry(System.Windows.Point st, System.Windows.Point ed)
        {
                double a = 0.5 * (ed.X - st.X);
            double b = 0.5 * (ed.Y - st.Y);
            List<System.Windows.Point> pointList = new List<System.Windows.Point>();
            for (double r = 0; r <= 2 * Math.PI; r = r + 0.01)
            {
                pointList.Add(new System.Windows.Point(0.5 * (st.X + ed.X) + a * Math.Cos(r), 0.5 * (st.Y + ed.Y) + b * Math.Sin(r)));
            }
            return pointList;
        }
        /// <summary>
        /// 鼠标松开时
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void blackboard_canvas_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
        {
            StrokeRound = null;
            StrokeRectangle = null;
        }
    }
}