alice-teacher Global Variables

[Emily Higgins]

Don -
 Thank you for the information, but I am trying to do this in Alice 3....
 The prior email with the parameter passing and functions was helpful, but
if you had a sample program from Alice 3, that would be great!
Emily Higgins


On Wed, Dec 11, 2013 at 2:35 PM, Don Slater <dslater at andrew.cmu.edu> wrote:

> See the attached screen shot and Alice world (countClicks.a2w)
>
> I have created a project with a t_rex and a triceratops, and I want to
> count when each is clicked on. I have created a variable for the t-rex and
> triceratops that keeps track of the number of times each is clicked on.
>
> I have written a world method countClicks with an object parameter
> objectsClicked (shown in the screen shot).
>
> IN the events editor, I have created a "when the mouse is clicked on
> anything do” event. I leave <anything> as the possible target to trigger
> the event, and from the do: drop down menu, I select the world countClicks
> method and from the objectClicked parameter menu, I select “expressions”
> and “object under mouse cursor”.
>
> I hope that this answers your question (I hope that I understood your
> question! ;-) )
>
> Please let me know if I have misunderstood, or if you have any other
> questions.
>
> All the best,
> Don Slater
>
>
>
>
>
>
>
> On Dec 11, 2013, at 11:11 AM, Emily Higgins <erphiggins at gmail.com> wrote:
>
> I can see how to pass a variable between the methods, but how can I pass
> it between an event listener and a method?  I want to, for example, keep
> track of number of mouse clicks during a game.  How can I do that?  I can't
> create a parameter in an event listener....  I think I am missing a step or
> a piece of understanding in figuring out how to manage this.
>
> Thank you
> Emily Higgins
> Boothbay Region High School
> Boothbay, Maine
>
>
> On Wed, Dec 11, 2013 at 1:17 PM, Don Slater <dslater at andrew.cmu.edu>wrote:
>
>> Alice 3 does not really support global variables in the same way as Alice
>> 2. Alice 3 is Java-based, with a strong sense of scope for variables.
>>
>> It is possible to create a variable that belongs to the Scene class, that
>> can be used by any other methods (functions and procedures) written on the
>> Scene class. But If I am writing a method for the Penguin class, that
>> method does not have access to the variable created in the Scene. That
>> Scene variable must be passed as a parameter to the Penguin method that
>> would like to use it, and a function of the Penguin class must return a
>> value to for updating the Scene variable.
>>
>> Please let me know if you have any other questions.
>>
>> Later,
>> Don Slater
>>
>> On Dec 10, 2013, at 3:04 PM, Robert Durtschi <robert.durtschi at gcsu.edu>
>> wrote:
>>
>> > I'm guessing it's the same for Alice 3; In Alice 2.x variables created
>> as properties of the World object (top object in the object-tree) could be
>> seen/manipulated by all other objects.
>> >
>> >
>> > Hello All -
>> > I am trying to iterate a counter in an event listener, so that if the
>> user
>> > clicks on four objects, an action occurs.   How can I do this?  I also
>> > can't figure out how to make a global variable that can be accessed
>> > throughout the program.
>> >
>> > Emily Higgins
>> > Boothbay Region High School
>> > Boothbay Harbor, Maine
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