如何在边框中绘制一条将其分成两半的直线

Question

我在 wpf 应用程序中有一个边框。

如何在边框画一条直线将它分成两半？
我有一个用于单击边框的处理程序。 MouseDown后如何在按下点（p.Y,p.X）画一个黑点？以及第二次按下后如何擦除旧的并绘制新的？

Answer 1

要画一条线来划分边界，你可以像这样使用 Line 或 Polyline:

(你需要找到你的边框高度和重量才能得到半点，假设它是 200,300)

public MainWindow()
        {
            InitializeComponent();
            canvas.Children.Clear();
            Point[] points = new Point[2]
            {
            new Point(0,  100),
            new Point(300 , 100)
            };
            DrawLine(points);

        }

private void DrawLine(Point[] points)
        {
            Polyline line = new Polyline();
            PointCollection collection = new PointCollection();
            foreach (Point p in points)
            {
                collection.Add(p);
            }
            line.Points = collection;
            line.Stroke = new SolidColorBrush(Colors.Red);
            line.StrokeThickness = 1;
            canvas.Children.Add(line);
        }

画点可以用Ellipse，也可以用e.GetPosition()得到鼠标点击的位置：

private void Window_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    \ Remove the last object from the canvas
     if(Canvas.Children.Count>0)
    canvas.Children.RemoveAt(canvas.Children.Count-1);

    Ellipse ellipse = new Ellipse();
    ellipse.Fill = Brushes.Sienna;
    ellipse.Width = 10;
    ellipse.Height = 10;
    ellipse.StrokeThickness = 2;

    canvas.Children.Add(ellipse);

    \Set the position of the point.
    Canvas.SetLeft(ellipse, e.GetPosition(canvas).X);
    Canvas.SetTop(ellipse, e.GetPosition(canvas).Y);
}

如何在边框中绘制一条将其分成两半的直线

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