KeyPress function on data rather on figure

2017 2 7
2 个回答
更新时间：2017 2 7
3 次查看（30 天）

0 个投票

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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回答（2 个）

Walter Roberson
Walter Roberson 2017-2-7

0 个投票

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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Rheeda
Rheeda 2017-2-7
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
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
Rheeda 2017-2-7
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

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Rheeda
Rheeda 2017-2-7
编辑：Walter Roberson 2017-2-7

0 个投票

All I need in my script was:
camproj perspective
camva(50)

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