ViewPort3D：如何從后面的代碼中創建帶有文本的WPF對象（多維數據集）

Question

我想繪制一組3D多維數據集，每個多維數據集都應顯示一個名稱，並且在選擇多維數據集時也應具有自己的事件處理程序。

是否可以使用背后的代碼或xaml綁定實現它？

Answer 1

要從背后的代碼繪制3D立方體，我將使用Helix3D工具箱CubeVisual3D。 但是，如果您要堅持使用現有的WPF 3D元素，則實現起來非常簡單。

從此處開始了解3D環境中的文本http://www.codeproject.com/Articles/33893/WPF-Creation-of-Text-Labels-for-3D-Scene ，它將指導您通過兩種不同的方法將文本添加到3D圖像，我發現非常有幫助。

對於多維數據集，只需使用RectangleVisual3D對象即可。

    RectangleVisual3D myCube = new RectangleVisual3D();
    myCube.Origin = new Point3D(0, 0, 0); //Set this value to whatever you want your Cube Origen to be.
    myCube.Width = 5; //whatever width you would like.
    myCube.Length = 5; //Set Length = Width
    myCube.Normal = new Vector3D(0, 1, 0); // if you want a cube that is not at some angle then use a vector in the direction of an axis such as this one or <1,0,0> and <0,0,1>
    myCube.LengthDirection = new Vector3D(0, 1, 0); //This will depend on the orientation of the cube however since it is equilateral just set it to the same thing as normal.
    myCube.Material = new DiffuseMaterial(Brushes.Red); // Set this with whatever you want or just set the myCube.Fill Property with a brush type.

太添加了事件處理程序，我相信您必須將處理程序添加到Viewport3D。 這種性質的東西應該起作用。

    public Window1()
    {
    InitializeComponent();
    this.mainViewport.MouseDown += new MouseButtonEventHandler(mainViewport_MouseDown);
    this.mainViewport.MouseUp += new MouseButtonEventHandler(mainViewport_MouseUp);
    }

然后添加此功能

    ModelVisual3D GetHitResult(Point location)
    {
    HitTestResult result = VisualTreeHelper.HitTest(mainViewport, location);
    if(result != null && result.VisualHit is ModelVisual3D)
    {
    ModelVisual3D visual = (ModelVisual3D)result.VisualHit;
    return visual;
    }

    return null;
    }

然后添加事件處理程序

    void mainViewport_MouseUp(object sender, MouseButtonEventArgs e)
    {
    Point location = e.GetPosition(mainViewport);
    ModelVisual3D result = GetHitResult(location);
    if(result == null)
    {
    return;
    }
    //Do Stuff Here
    }

    void mainViewport_MouseDown(object sender, MouseButtonEventArgs e)
    {
    Point location = e.GetPosition(mainViewport);
    ModelVisual3D result = GetHitResult(location);
    if(result == null)
    {
    return;
    }
    //Do Stuff Here
    }