如何优化 WPF 中的 Canvas 绘图？

Question

当我在程序“Paint”中有 10000 行时，如何优化 WPF 中的 Canvas 绘图？当我在“Paint”中绘制时，我可以使用我需要多少线条和圆圈，但在我的程序中 agter +-10000 我有滞后。 我创建了一个 10000 行的测试程序，当我在画布矩形上移动鼠标时，将位置更改为光标。 这里代码

for (int i=0; i < 10000; i++)
        {
            Line l = new Line();
            l.Stroke = Brushes.Black;
            l.StrokeThickness = 1;
            l.X1 = 50+ privi;
            l.Y1 = 50 + privi;
            l.X2 = 100 ;
            l.Y2 = 100 + privi;
            MainCanvas.Children.Add(l);
            privi += 5;
}

我在这里移动

if (clicked)
        {
            Point p = Mouse.GetPosition(MainCanvas);
            rect.Margin = new Thickness(p.X-25, p.Y - 25, 0, 0);
        }
enter code here

---

更新

privi = 5;
Rectangle rect = new Rectangle();
rect.Fill = Brushes.Black;
rect.Width = 50;
rect.Height = 50;
MainCanvas.Children.Add(rect)

Answer 1

我不知道您是否需要将线条和矩形放在同一个画布中，否则我发现在 MainCanvas 上方的第二个透明画布中添加矩形可以提高反应性。

<Window x:Class="WpfApplication.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="MainWindow" Height="1080" Width="1024">
    <Canvas Name="MainCanvas" MouseMove="MainCanvas_MouseMove">
       <Canvas Name="RectCanvas" Background="Transparent" MouseMove="RectCanvas_MouseMove">
       </Canvas>
    </Canvas>
</Window>

public partial class MainWindow : Window
{
    double privi = 5;

    Rectangle rect;

    public MainWindow()
    {
        InitializeComponent();

        for (int i = 0; i < 10000; i++)
        {
            Line l = new Line();
            l.Stroke = Brushes.Black;
            l.StrokeThickness = 1;
            l.X1 = 50 + privi;
            l.Y1 = 50 + privi;
            l.X2 = 100;
            l.Y2 = 100 + privi;
            MainCanvas.Children.Add(l);
            privi += 5;
        }

        rect = new Rectangle();
        rect.Width = 50;
        rect.Height = 50;            
        rect.Fill = Brushes.Black;
        Canvas.SetLeft(rect, 0);
        Canvas.SetTop(rect, 0);
        SecondCanvas.Children.Add(rect);
    }

    private void RectCanvas_MouseMove(object sender, MouseEventArgs e)
    {
        //if (clicked)
        {
            Point p = Mouse.GetPosition(MainCanvas);
            rect.Margin = new Thickness(p.X - 25, p.Y - 25, 0, 0);
        }
    }
}