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so I'm making a videogame

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Stephen
Stephen 2012-5-24
I have a vector of enemy handles so that I can assign visibility to certain enemies and not others, but once I update all of their positions (xdata and ydata), the visibility gets messed up and all become visible in the entire map. Anyone know why? I tried to use get(e,'visible') but it returns a cell of 'on' or 'off' that sucks to feed into set

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回答（3 个）

Stephen
Stephen 2012-5-24
y=get(h,'ydata');
x=get(h,'xdata');
hy = hypot(ye-y,xe-x)<8;
set(e(hy),'visible','on')
this gets the player position and makes certain enemies visible
xs=sign(xe-x)*randint;
ys=sign(ye-y)*randint;
hy = hypot(ye-y,xe-x)<6;
hy = logical(hy.*(loc==zones(y,x)));
xe(hy)=xe(hy)-xs(hy);
ye(hy)=ye(hy)-ys(hy);
set(e,'xdata',xe,'ydata',ye)
This updates the enemies position and ruins everything
Matt Kindig
Matt Kindig 2012-5-24
Do you have any calls to 'drawnow'? I don't think that simply changing the xdata/ydata is supposed to change handle visibility. Some other commands, such as 'figure', 'pause', and others automatically call drawnow.
One way you could quickly set all visibilities is to pass in a vector of handles to the set command. Something like:
set( HandlesOfHiddenObjects, 'Visible', 'off');
set( HandlesOfVisibleObjects, 'Visible', 'on');
  2 个评论
Walter Roberson
Walter Roberson 2012-5-24
drawnow() should not affect the visibility of anything.
Stephen
Stephen 2012-5-24
I have drawnow in the main while loop of the game

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Walter Roberson
Walter Roberson 2012-5-24
You cannot set the visibility of individual points in a line object. Your visibility with that code is going to be set according to the last value that happens to be in the array.
  2 个评论
Stephen
Stephen 2012-5-24
it isn't one line object, but several single point objects whose handles I packed into a single vector, e. I'll try some different syntax
Stephen
Stephen 2012-5-24
also, the visibility line works, it's just that once I update the positions it resets all visibilities

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