在代碼中使用GeometryGroup創建組合形狀

Question

我需要一些幫助來使用我的代碼。 combineShape.Freeze（）函數看起來不太好。

在這種情況下，我有兩個單選按鈕，名爲rbtPoint和rbtLine。當我單擊rbtPoint並單擊畫布時，它將創建一個點，現在我必須在畫布中創建2個點（ellipse1，ellipse2），在此步驟中，我已經可以在畫布周圍拖動Point（橢圓1或橢圓2） 。然後當我點擊rbtLine然後點擊第一個點（ellipse1）它會將點的顏色從紅色變爲藍色，然後當我再次點擊第二個點（橢圓2）時，它也會將顏色變成紅色，並且它會創建從ellipse1到ellipse2的連接藍線。 之後，使用GeometryGroup（）函數將直線和2個點合併爲1個形狀。我看到的代碼從這個鏈接：

http://stackoverflow.com/questions/16417950/combining-linegeometry-with-ellipsegeometry-in-code-not-xaml

這裏是我的代碼來創建功能：

 
private void myCanvas_MouseDown(object sender, MouseButtonEventArgs e) 
     { 
      mouseDown = true; 
      initialPoint = e.GetPosition(sender as IInputElement); 

      if (rbtPoint.IsChecked == true) 
      { 
       if (e.OriginalSource is Ellipse) 
       { 
        captured = true; 
        shapePoint = e.GetPosition(sender as IInputElement); 
        clickedEllipse = (Ellipse)e.OriginalSource; 
        uielement = (UIElement)e.OriginalSource; 
       } 
       else 
       { 
        shapeEllipse = new Ellipse(); 
        (shapeEllipse as Ellipse).Width = 30; 
        (shapeEllipse as Ellipse).Height = 30; 
        (shapeEllipse as Ellipse).StrokeThickness = 5; 
        (shapeEllipse as Ellipse).Fill = Brushes.Red; 
        Canvas.SetLeft(shapeEllipse, initialPoint.X); 
        Canvas.SetTop(shapeEllipse, initialPoint.Y); 
        myCanvas.Children.Add(shapeEllipse); 
       } 
      } 
     }    

 
private void myCanvas_MouseUp(object sender, MouseButtonEventArgs e) 
     { 
      Mouse.Capture(null); 
      captured = false; 
      mouseDown = false; 
      if (rbtLine.IsChecked == true) 
      { 
       if (e.OriginalSource is Ellipse) 
       { 
        captured = true; 
        initialPoint = e.GetPosition(sender as IInputElement); 
        clickedEllipse = (Ellipse)e.OriginalSource; 
        uielement = (UIElement)e.OriginalSource; 
        poin = e.MouseDevice.GetPosition(uielement); 
        clickedEllipse.Fill = Brushes.Blue; 
        if (firstpoint.X != 0 && firstpoint.Y != 0) 
        { 
         lineEndPoint = initialPoint; 
        } 
        else 
        { 
         firstpoint = initialPoint; 
        } 
       } 

       if (lineEndPoint.X != 0 && lineEndPoint.Y != 0) 
       { 
        Point p = e.GetPosition(sender as IInputElement); 
        shapeLine = new Line(); 
        (shapeLine as Line).X1 = firstpoint.X; 
        (shapeLine as Line).Y1 = firstpoint.Y; 
        (shapeLine as Line).X2 = lineEndPoint.X; 
        (shapeLine as Line).Y2 = lineEndPoint.Y; 
        (shapeLine as Line).Stroke = Brushes.Blue; 
        (shapeLine as Line).StrokeThickness = 5; 
        //(shape as Line).Fill = Brushes.Blue; 
        //Canvas.SetLeft(shape, firstpoint.X); 
        //Canvas.SetTop(shape, firstpoint.Y); 
        myCanvas.Children.Add(shapeLine); 
        lineCreated = true; 

        var ellipse1 = new EllipseGeometry(firstpoint, firstpoint.X, firstpoint.Y); 
        var ellipse2 = new EllipseGeometry(lineEndPoint, lineEndPoint.X, lineEndPoint.Y); 
        var line = new LineGeometry(this.firstpoint, this.lineEndPoint); 

        GeometryGroup combinedShape = new GeometryGroup(); 
        combinedShape.Children.Add(ellipse1); 
        combinedShape.Children.Add(ellipse2); 
        combinedShape.Children.Add(line); 

        combinedShape.Freeze(); 
       } 

      } 
     } 

後，我跑combinedShape.Freeze（）函數，當我再次點擊一個點並拖動它，它只會移動點擊點，而沒有其他點和線跟隨我的鼠標移動。

如何解決這個問題？我發現許多相關的文章，但他們中的大多數人在XAML中執行代碼而不是代碼隱藏。或者還有其他解決方法嗎？ 我需要建議，對於這個問題，

感謝你的幫助，代碼大師..

Fikri

Answer 1

聽起來像你對我真的不希望凍結它。 Freeze（）使幾何體不可更改，這正是它不改變的原因。

唯一的其他選擇是做類似clone（）的凍結幾何體，然後刪除凍結的幾何體。

private void myCanvas_MouseDown(object sender, MouseButtonEventArgs e) 
     { 
      mouseDown = true; 
      initialPoint = e.GetPosition(sender as IInputElement); 

      if (rbtPoint.IsChecked == true) 
      { 
       if (e.OriginalSource is Ellipse) 
       { 
        captured = true; 
        shapePoint = e.GetPosition(sender as IInputElement); 
        var frozen = (Ellipse)e.OriginalSource; 
        clickedEllipse = frozen.Clone(); 
        myCanvas.Children.Remove(frozen); 
        myCanvas.Children.Add(clickedEllipse); 
        uielement = (UIElement)clickedEllipse; 
       } 
       else