[squeakland] Can a Morph / (etoys player) follow a connector path ?

[Steve Thomas]

Mike,

No high level method I know of to track a connector. But there are many
wonderful things inside Etoys which I have not yet discovered.

So lets break down the game a bit.  You have to detect clicking on a
particular plane (this can be done setting a script for each plane to
execute on a mouse down event).
Then you have to "draw a path to the target" and that path is not always a
straight line.
And you have to make sure the plane you clicked follows the path you drew
for it, not another planes path (assuming you are making a multi-plane
game).

Well lets start simple with a single plane version.

First let's assume only a plane and target.  When you click on the plane
you can get a script to execute by setting the scripts "when to run" to
"Mouse down" (in the script editor, click on normal and you will get a list
of options).
[image: Inline image 1]

Now once you click on the script you would need to start "drawing the path"
One way to do this would be to create a copy of a "marker" (pick any object
you want to use as your marker) and have it follow your mouse movements.
 For the script below I created my plane on the page of a book (I like
doing this as I can duplicate pages for different versions as I play and
explore).  The script below was started with the "mouse down" on the plane
from the script above.

[image: Inline image 2]

Then when you click again you would want to stop the marker from following
the mouse.
[image: Inline image 3]

Now of course you would need to create copies of these markers and keep
track of them for each plane (a holder would be a good way to keep track of
them). And to show the path you could use connectors connecting your plane
to the markers.

There are a number of more "advanced" Etoys features you would need to use
but if you can play around with the above and want to go further, please
send more questions to the list and we'll be glad to help.

Stephen

On Fri, Mar 16, 2012 at 1:09 PM, Mike Stramba <mikestramba at gmail.com> wrote:

> I'd like to do something similar to this game in Squeak / Etoys
>
> http://www.gamenet.com/game/air-traffic-chief/
>
> I.e. using a connector, having the motion of a morph follow that
> connector, as the connector is moved while the morph is moving.
>
> I see the demos in Etoys of   a "car following a road", but they seem
> to be tracking a particular color, and continually turning left or
> right (which is ya, basically what any path finding program is gonna
> have to do internally, I guess).
>
> Wondering if there is a "high level"  / class  / etoys .. method etc,
> to track a connector
>
> Mike
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> squeakland at squeakland.org
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>
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