KeyPress function on data rather on figure

Question

Rheeda 2017-2-7

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/323766-keypress-function-on-data-rather-on-figure

编辑： Walter Roberson 2017-2-7

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

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Answer 1

Walter Roberson 2017-2-7

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/323766-keypress-function-on-data-rather-on-figure#answer_253713

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.)

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Walter Roberson 2017-2-7

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 2017-2-7

在 MATLAB Online 中打开

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