public DrawBoardViewModel()
        {
            CanvasSize canvasSize1 = new CanvasSize("100%", 1.0);
            CanvasSize canvasSize2 = new CanvasSize("125%", 1.25);
            CanvasSize canvasSize3 = new CanvasSize("150%", 1.5);

            CnavasSizeList.Add(canvasSize1);
            CnavasSizeList.Add(canvasSize2);
            CnavasSizeList.Add(canvasSize3);


            List <MyFontFamily> myFontList = new List <MyFontFamily>();

            myFontList = GetAllFonts();

            fonts        = new ObservableCollection <MyFontFamily>(myFontList);
            fontSizeList = new ObservableCollection <int>()
            {
                6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 28, 32, 36, 42, 46, 50
            };
            SelectedFontSize = fontSizeList.ToList().Find(p => p == 16);
            foregrounds      = new ObservableCollection <string>()
            {
                "White", "Black", "Gray", "Green", "Blue", "Yellow", "Orange"
            };
            selectedColor      = foregrounds.First();
            selectedFontFamily = myFontList.Find(p => p.FontName == "微软雅黑");


            var allColors = GetAllColors();

            lineBrushes = new ObservableCollection <string>(allColors);

            selectedLineColor = allColors.Find(p => p == "Red");
        }
        private List <MyFontFamily> GetAllFonts()
        {
            List <MyFontFamily> myFontList = new List <MyFontFamily>();
            var fontCollection             = Fonts.GetFontFamilies(@"c:\Windows\Fonts");

            if (fontCollection != null)
            {
                foreach (var item in fontCollection)
                {
                    var name         = string.Empty;
                    var languageItem = System.Windows.Markup.XmlLanguage.GetLanguage("zh-cn");
                    if (item.FamilyNames.Keys.Contains(languageItem))
                    {
                        name = item.FamilyNames[languageItem];
                    }
                    else
                    {
                        var enLanguageItem = System.Windows.Markup.XmlLanguage.GetLanguage("en-us");
                        if (item.FamilyNames.Keys.Contains(enLanguageItem))
                        {
                            name = item.FamilyNames[enLanguageItem];
                        }
                    }
                    var myFontItem = new MyFontFamily()
                    {
                        FontFamilyEntity = item, FontName = name
                    };

                    myFontList.Add(myFontItem);
                }
            }

            return(myFontList);
        }