KeyPress function on data rather on figure

Hi,

I am trying to implement a key-press function for basically a fly through scene, i.e. updating the cam target and cam pos through a patched surface.

However, the key-press is acting on the figure itself instead of the plotted data. Is there another way to implement it/what am I doing wrong?

Thanks, Ali

Example code:

patch_fig=figure;
  p=patch('Faces',faces,'Vertices',vertices,'FaceColor','red');
  set(patch_fig,'KeyPressFcn',{@fh_keypress_handle, patch_fig});

    %%function%%

    function fh_keypress_handle(H,E,patch_fig)

    hAx=gca;
    [cPosition, cTarget, cViewAngle, cViewVector, cRightVector, cUpVector] = getcamerageometry(hAx);
    current_pos = campos(hAx);
    current_camtarget = camtarget(hAx);

    switch E.Key
        %%Move in x direction
        case 'uparrow'
            if isempty(E.Modifier)
                campos(current_pos + cViewVector);
                camtarget([current_camtarget+cViewVector]);
                camlight(hlight,'headlight')

        case 'downarrow'

            if isempty(E.Modifier)
                campos(current_pos - cViewVector);
                camtarget([current_camtarget-cViewVector]);          

    end

Answer 1

[Walter Roberson]

You should probably use a figure WindowKeypressFcn callback instead of a figure KeyPressFcn. The KeyPressFcn has the tendency to give typing focus to the figure.

But first alter all of your cam* calls to pass in the axes. And instead of fetching the axes using gca(), pass it in instead of patch_fig (which is not used in your routine.)

[Rheeda]

Thanks Walter. Would I still be able to use the up/down arrow keys for moving the cam pos/cam target?? Also, how do I pass the cam calls in the axes?

Cheers, Rheeda

[Walter Roberson]

The axes can go as the first argument to the cam* calls.

I would fix the axes stuff up first before switching to WindowKeyPressFcn; you might not have to switch that.

[Rheeda]

Hi Walter,

I've update the code to pass in the camera properties in the axes handle, and have changed to WindowPres but the up/down arrows still move the figure itself (KeyPress gives the same response).

Am I still doing something wrong?

Thanks for your help, Rheeda

patch_fig=figure;

p=patch('Faces',faces,'Vertices',vertices,'FaceColor','red');
reducepatch(p,0.7);

Centreofmass=[mean(vertices(:,1)), mean(vertices(:,2)),mean(vertices(:,3))];
hAx=gca;
[cPosition, cTarget, cViewAngle, cViewVector, cRightVector, cUpVector] = getcamerageometry(hAx);
hAx.CameraPosition=[Centreofmass(1), Centreofmass(2),Centreofmass(3)];
hAx.CameraTarget= [cTarget(1) cTarget(2) cTarget(3)];

set(patch_fig,'WindowKeypressFcn',{@fh_keypress_handle_edit, hAx});

function fh_keypress_handle_edit(H,E,hAx)

current_pos = hAx.CameraPosition;
current_camtarget = hAx.CameraTarget;
[cPosition, cTarget, cViewAngle, cViewVector, cRightVector, cUpVector] = getcamerageometry(hAx);

[azimuth,elevation,r] = cart2sph(hAx.CameraTarget(1), hAx.CameraTarget(2), hAx.CameraTarget(3));

switch E.Key
    %%Move in x direction
    case 'uparrow'
        if isempty(E.Modifier)
            campos(current_pos + cViewVector);
            camtarget([current_camtarget+cViewVector]);
            hAx.CameraPosition=current_pos + cViewVector;
            hAx.CameraTarget= current_camtarget+cViewVector;

      case 'downarrow'

          if isempty(E.Modifier)
              campos(current_pos - cViewVector);
              camtarget([current_camtarget-cViewVector]);    
              hAx.CameraPosition=current_pos + cViewVector;
              hAx.CameraTarget= current_camtarget+cViewVector;

        end

Answer 2

[Rheeda]

All I need in my script was:

camproj perspective
camva(50)