Java slider not Responding
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The slider is saved as S.sl1 and I convert it to sl1 and output it. I then convert it to a java slider in another function with :
jScrollBar = findjobj(sl1);
jScrollBar.AdjustmentValueChangedCallback = @updateplot;
Then the call back function is:
function updateplot(sl1,ht,funcNum)
x = get(sl1,'Value');
Beam.Location = x;
switch funcNum
case funcNum == 1
y = Cantilieverd_Point(Beam);
set(ht,'ydata',y);
drawnow;
case funcNum == 2
y = Simple_Point(Beam);
set(ht,'ydata',y);
drawnow;
end
end
Where ht is the plot that is being updated and the ' y = ' is another function which creates the y value. When I run this it does not return an error, but it also does absolutely nothing to the graph. I want it to continuously update the graph based off of the slider value.
5 个评论
Matt Fig
2012-12-12
Just a note:
When you post code that relies on a FEX file, you should state that and give a link so people don't try to copy/paste your code only to get an error...
Matt Fig
2012-12-12
Also, were you not able to make the addlistener code work?
Malcolm Lidierth
2012-12-12
How does updateplot know the value of funcNum? ht is an EventData object - it has no 'ydata' property. Is this a slider or a scrollBar.
The callback can not be being called - or you would see errors.
A more complete code example is needed to be more helpful.
Lawson Hoover
2012-12-12
Malcolm Lidierth
2012-12-12
编辑：Malcolm Lidierth
2012-12-12
@Lawson That is a vital bit of info. The callback is evaluated once, throws an exception and gets removed by MATLAB. You need something like:
jScrollBar.AdjustmentValueChangedCallback = {@updateplot, ht, funcNum};
The callback should then be declared as:
function updateplot(sl1,EvenData, ht, funcNum)
sl1 and EventData are added automatically to the inputs by MATLAB>
回答（1 个）
Jan
2012-12-12
There are several problems in your code:
1. Here the callback is defined with no inputs:
jScrollBar.AdjustmentValueChangedCallback = @updateplot;
But in the definition of the callback function, 3 inputs are required.
2. Look at the documentation of switch/case again. The term "funcNum==1" is evaluated to either true or false, but you want to switch for the value 1 or 2. Therefore you need:
switch funcNum
case 1 % Not "funcNum == 1"
...
I suggest not to use a Java slider, but the standard Matlab sliders. You cann attach a listener to them also: http://www.mathworks.com/support/solutions/en/data/1-3SR0YI/index.html?product=ML&solution=1-3SR0YI
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2012-12-12
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