我可以全局访问DrawContext变量吗？ （在我的应用程序的任何类中）

Question

我的编程技巧不太好，而且他们在C＃时仍然非常业余 我想问一下Draw_Context我在这里做的是找出关节之间的角度...我想做的是当角度介于70和90之间的计时器启动并使用Drawcontext.DrawText方法在屏幕上显示任何消息 但正如你所看到的，我无法访问on_time_event中的draw变量 如果我尝试引入一个新的DrawContext变量并为其赋值draw ...它给出和异常...因为Draw上下文的新变量从未赋值 我该怎么办？ 请在这方面提供任何帮助，我将非常乐于助人

 class angle
  {
    System.Timers.Timer timer = new System.Timers.Timer();
    bool timer_start = false;
    int index = 5; 
    public DrawingContext draw_contex;


  public void angle_between_left_shoulder(Skeleton sk1, DrawingContext draw, JointType    
  Shoulder_cntre, 
        JointType Shoulder_left, JointType Elbow_left, KinectSensor sen)
    {

        //draw_contex= draw;
        Joint sh_cntr = sk1.Joints[Shoulder_cntre];
        Joint sh_left = sk1.Joints[Shoulder_left];
        Joint elb_left = sk1.Joints[Elbow_left];

        Vector3 v_shoulder = new Vector3(sh_cntr.Position.X, sh_left.Position.Y, 
        sh_cntr.Position.Z);
        Vector3 v_should_l = new Vector3(sh_left.Position.X, sh_left.Position.Y, 
        sh_left.Position.Z);
        Vector3 v_elbow_l = new Vector3(elb_left.Position.X, elb_left.Position.Y, 
        elb_left.Position.Z);

        Vector3 va = v_shoulder - v_should_l;
        Vector3 vb = v_elbow_l - v_should_l;

        va = Vector3.Normalize(va);
        vb = Vector3.Normalize(vb);

        float len_prod = va.Length() * va.Length();
        float dot_pro = Vector3.Dot(va, vb);
        double angle = Math.Acos(dot_pro);

        angle = angle * 180 / Math.PI;
        angle = 180 - angle;

        System.Windows.Point shoul_l = this.point_toScreen(sh_left.Position, sen);
        draw.DrawText(new FormattedText(angle.ToString("0"), new 
         System.Globalization.CultureInfo("en-us"),
         FlowDirection.LeftToRight,
         new Typeface("Verdana"), 16, Brushes.OrangeRed),
         new System.Windows.Point(shoul_l.X+10, shoul_l.Y +20));

        if (angle > 70 && angle < 90)
        {
            if (timer_start == false)
            {

                timer.Interval = 2000;
                timer.Start();
                timer.Elapsed += new ElapsedEventHandler(on_time_event);




            }
        }
    }

    void on_time_event(object sender, ElapsedEventArgs e)
     {
      --index;
       if (index != 0)
       {

        MessageBox.Show(index.ToString());

        /*
         draw_contex.DrawText(new FormattedText(index.ToString("0"), new 
        System.Globalization.CultureInfo("en-us"),
             FlowDirection.LeftToRight,
             new Typeface("Verdana"), 16, Brushes.OrangeRed),
             new System.Windows.Point(10, 120));
       }
      else
       {
        timer.Stop();
       }

Answer 1

如果您只想在窗口中显示格式化字符串，则可以写入TextBlock。在您的XAML中，您将拥有以下内容：

<Grid>
  <!-- whatever other controls you have -->
  <TextBlock Name="MyMessage" />
</Grid>

然后在你的代码隐藏中，你可以在TextBlock上写一个新的字符串：

MyMessage.Text = "You moved too soon!";

您也可以轻松地格式化字符串并将其发送到该字符串。

此外，如果我之前关于此主题的问题的答案有用，请接受。不胜感激！ :) body joints angle using kinect (checking time interval)