WPF的MVVM模式 - 不使用任何工具包的2d图形

Question

需要在WPF中以最简单的方式绘制2D图形（我认为 - 它是折线）使用MVVM模式。我创建了几个类：

    namespace SomeNamespace.Models
    {
        class Info
        {
          //  public  Queue<int> Dots { get; set; }???


            public int Point { get; set; }
            public int GetLoad()
            {
                return new Random (100); //Get some data from external class
            }
        }
    }

    namespace SomeNamespace.ViewModels
        {
public abstract class ViewModelBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;

        protected void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }

    }
            class InfoViewModel: ViewModelBase
            {
              //private Queue<Point> _dots = new Queue<Point>();
            //public Queue<int> Dots
            //{
            //    get { return _dots; }
            //    set
            //    {
            //        _dots = value;
            //        OnPropertyChanged("Dots");
            //    }
            //}

            private int _point;
            public int Point
            {
                get { return _point; }
                set
                {
                    _point = value;
                    OnPropertyChanged("Point");
                }
            }
          }


class MainViewModel : ViewModelBase
    {
       // public ObservableCollection<InfoViewModel> InfoList { get; set; }??
        public ObservableCollection<int> Points { get; set; } 

        public MainViewModel(List<Info>  info)
        {
            //InfoList  = new ObservableCollection<InfoListViewModel>(info.Select i => new InfoViewModel( i)));???
            Points = new ObservableCollection<int>() { 10, 20, 30, 40 }; //just for test
        }



    }
}

在App.xaml

中

 public partial class App : Application
    {
        private void OnStartup(object sender, StartupEventArgs e)
        {
            List<Info>  i = new List<Info>()
            {
                new Info(){ Point = 10 },
                new Info(){ Point = 15 },
                new Info(){ Point = 20 },


                new Info(){ Point = 25 },
                new Info(){ Point = 30  },
                new Info(){ Point = 35  } 

            };



            MainWindow mainView = new MainWindow();
            MainViewModel mainViewModel = new MainViewModel( i);
            mainView.DataContext = mainViewModel;
            mainView.Show();
        }
    }

在MainWindow.xaml

<Grid>
    <Polyline Name="graph1"   Fill="Blue"
              Points="{Binding Points}"  Stroke="Blue" >

    </Polyline>

 </Grid>

但它不起作用。

编辑：

我写了以下代码，但我不明白：

1）我如何绑定    <Line X1="{Binding ??}" Y1="{Binding ??}" X2="{Binding ??}" Y2="{Binding ??}" Stroke="Red"/>到队列＆lt;点＆gt; ？

2）< Line .../>如何每秒刷新一次？或者ViewModel如何每秒刷新一次并通知View有关它？

public class Segment
    {
        public Queue<Point> Dots { get; set; }

    }

    public class ViewModel:INotifyPropertyChanged
    {
        private Queue<Segment> _segments;
        public Queue<Segment> Segments
        {
            get { return _segments; }
            set
            {
                _segments = value;
                OnPropertyChanged("Segments");
            }
        }


        public ViewModel(Queue<Point> segments)
        {

        }


        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged(string propertyName)
        {
            PropertyChangedEventHandler handler = PropertyChanged;

            if (handler != null)
            {
                handler(this, new PropertyChangedEventArgs(propertyName));
            }
        }
    }




 MainWindow mainView = new MainWindow();

            Queue<Point> q = Class1.GenerateData(); //Class1.GenerateData() returns Queue<Point>  
            mainView.DataContext = new ViewModel(q);

Answer 1

使用MVVM模式在WPF中创建穷人图表的最简单方法是将数据转换为易于通过标记消费的格式，特别是段而不是点。

以下是代表视图模型的代码：

    public class Segment
    {
        public Point From { get; set; }
        public Point To { get; set; }
    }

    public class ViewModel
    {
        public IList<Segment> Segments { get; set; }
    }

    void SetDataContext()
    {
        var Points = new Point[]
        {
            new Point { X = 0, Y = 10 },
            new Point { X = 10, Y = 30 },
            new Point { X = 20, Y = 20 },
        };
        DataContext = new ViewModel
        {
            Segments = new List<Segment>(Points.Zip(Points.Skip(1), (a, b) => new Segment { From = a, To = b }))
        };
    }

以下是如何根据该数据创建一个简单的图表：

<Grid>
    <Border Height="100" Width="100" BorderBrush="Black" BorderThickness="1">
        <Canvas Background="Pink">
            <Canvas.LayoutTransform>
                <ScaleTransform ScaleY="-1"/>
            </Canvas.LayoutTransform>
            <ItemsControl ItemsSource="{Binding Segments}">
                <ItemsControl.ItemsPanel>
                    <ItemsPanelTemplate>
                        <Canvas/>
                    </ItemsPanelTemplate>
                </ItemsControl.ItemsPanel>
                <ItemsControl.ItemTemplate>
                    <DataTemplate>
                        <Line X1="{Binding From.X}" Y1="{Binding From.Y}" X2="{Binding To.X}" Y2="{Binding To.Y}" Stroke="Red"/>
                    </DataTemplate>
                </ItemsControl.ItemTemplate>
            </ItemsControl>
        </Canvas>
    </Border>
</Grid>

导致这个“图表”：