Accessing shapes in ILPanel and ILCamera

Question

I have three question regarding ILPanel in ILNumerics:

How can I disable the double click interaction of ILPanel to reset the view.
How can I increase the speed of panning using right click and drag. The panning is very slow especially when the shape is vary large.
How can access the elements that I add to a camera and modify them.

Here is a simple example. Two spheres are added to a camera and a ILLable, "Hello", is on top of one of them (the blue one). I want the "Hello" label to jump on top of the green sphere if I rotate the scene with mouse and the green sphere become closer to the camera and visa verse. And, how can I change the color of the spheres say by clicking a button?

 private void ilPanel1_Load(object sender, EventArgs e)
 {
        var scene = new ILScene();
        var cam = scene.Camera;
        var Sphere1 = new ILSphere();
        Sphere1.Wireframe.Visible = true;
        Sphere1.Fill.Color = Color.Blue;
        Sphere1.Wireframe.Color = Color.Blue;
        Sphere1.Transform = Matrix4.Translation(0, 0, 0);
        var Sphere2 = new ILSphere();
        Sphere2.Wireframe.Visible = true;
        Sphere2.Transform = Matrix4.Translation(2, 0, 0);
        cam.Add(Sphere1);
        cam.Add(Sphere2);
        cam.Add(new ILLabel("Hello")
        {
            Font = new System.Drawing.Font(FontFamily.GenericSansSerif, 8),
            Position = new Vector3(0, 0, 1.1),
            Anchor = new PointF(0, 1),
        });
        ilPanel1.Scene = scene;
 }

enter image description here

score 2 · Accepted Answer · answered Sep 02 '13 at 11:10

Create a label, which is always on top of other 3D objects

cam.Add(
        new ILScreenObject() {
            Location = new PointF(0.5f, 0.5f),
            Children = {
                new ILLabel("Hello") 
            }
        });

See also: http://ilnumerics.net/world3d-and-screen2d-nodes.html

Regarding your "jumping sphere" example: if your want your label to jump to another group (spheres are groups actually) at runtime, you will have to implement that logic into a function which is called at runtime. ilPanel1.BeginRenderFrame might be a good place to check for such updates.

Disable default behavior for the first camera:

scene.Camera.MouseDoubleClick += (_, arg) => {
    arg.Cancel = true;
};

See: http://ilnumerics.net/mouse-events.html

React on a button press:

button1.Click += (_,args) => {
    ilPanel1.Scene.First<ILSphere>().Fill.Color = Color.Red; 
    ilPanel1.Refresh(); 
};

Finding objects in the scene: see: http://ilnumerics.net/nodes-accessing-managing.html

Controlling the panning speed:

There is no easy way to configure the speed currently. The best way would be to implement the corresponding mouse handler on your own:

Override MouseMove for the camera node.
Implement the panning similar to the way it was done in ILNumerics (see: ILCamera.OnMouseMove in the sources).
Increase the scale factor.
Dont forget to cancel the event processing at the end of your handler.

Thanks for the answer. It is very helpful. For the jumping label, what I basically want to do is something similar to the ILCube as when the ILCube rotates, the labels on the axis move to prevent overlapping the shape being displayed. What I do not know is that, for example for the two spheres case, how I can find which sphere is closer to the camera so I move the label accordingly. — Ehsan, Sep 02 '13 at 12:00
Those 'scaling factors' could get exposed as settings variables? — user492238, Sep 02 '13 at 12:14

Accessing shapes in ILPanel and ILCamera

1 Answers1