Question

我已经使用PAINT事件在Winows表单应用程序中的Panel上绘制波形。但是当使用WPF时，我没有发现任何这样的元素等同于具有Paint事件的Panel。谷歌搜索了很多，但没有很大用处。

好吧，我需要在WPF中绘制一个波形，所以建议使用PaintArgsEvent或一个新解决方案的适当解决方案。

谢谢！

Answer 1

您正在寻找DrawingVisual Class

从第一个链接：

DrawingVisual是一个轻量级绘图类，用于渲染形状，图像或文本。此类被视为轻量级，因为它不提供布局或事件处理，从而提高了性能。因此，图纸非常适合背景和剪贴画。

您还可以访问PolyLine Class来添加点集合。此示例是经过修改的MSDN Forum example

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        float x0 = 100f;
        float y0 = 100f;
        Polyline myPoly = new Polyline();
        PointCollection polyPoints = myPoly.Points;
        Point[] points = new Point[200];

        for (int j = 0; j < 200; j++)
        {
            points[j] = new Point();
            points[j].X = x0 + j;
            points[j].Y = y0 -
            (float)(Math.Sin((2 * Math.PI * j) / 200) * (200 / (2 * Math.PI)));
        }

        for (int i = 0; i < points.Length ; i++)
        {
            polyPoints.Add(points[i]);
        }

        myPoly.Stroke = Brushes.Green;
        myPoly.StrokeThickness = 5;
        StackPanel mainPanel = new StackPanel();
        mainPanel.Children.Add(myPoly);
        this.Content = mainPanel;

    }
}

一个修改过的MSDN示例：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();

        float x0 = 100f;
        float y0 = 100f;
        Point[] points = new Point[200];

        for (int j = 0; j < 200; j++)
        {
            points[j] = new Point();
            points[j].X = x0 + j;
            points[j].Y = y0 -
            (float)(Math.Sin((2 * Math.PI * j) / 200) * (200 / (2 * Math.PI)));
        }

        DrawingBrush db = new DrawingBrush(CreateDrawingVisualRectangle(points).Drawing);
        StackPanel mainPanel = new StackPanel();
        mainPanel.Background = db;
        this.Content = mainPanel;

    }

    private DrawingVisual CreateDrawingVisualRectangle( Point[] pointarray)
    {
        DrawingVisual drawingVisual = new DrawingVisual();

        // Retrieve the DrawingContext in order to create new drawing content.
        DrawingContext drawingContext = drawingVisual.RenderOpen();

       // Create a rectangle and draw it in the DrawingContext.
       for (int i = 0; i < pointarray.Length-1; i++)
       {
           drawingContext.DrawLine(new Pen(new SolidColorBrush(Colors.Blue), 2), pointarray[i], pointarray[i + 1]);
       }

       // Persist the drawing content.
       drawingContext.Close();

       return drawingVisual;
     }

}

WPF中的Windows Form Paint等效事件

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