Hi all

for my small robot environment I define the following method so that a 
bot can move from one tile to another one.

Bot>>go
| nextPosition |
nextPosition := self nextPosition.
self goTo: nextPosition.
World doOneCycle.
self motorSound


When I remove the line World doOneCycle,

writing Bot new go; go; go; go
makes the bot moving but the user does not see it and only sees it at 
the end of the move.


Now I have other robot actions such as canPick (to test whether it can 
pick a diamond) and pick to really pick a diamond.

With the World doOneCycle in the go method, it may happen that when I 
execute fast

b2 go.
b2 canPick
	ifTrue: [b2 pick].

the bot misses to pick some diamonds: really annoying. I guess that 
this is because the method can pick and pick do not contain World 
doOneCycle.

I have the impression that this is a really bad practice to explicitly 
wait for the refresh but I do not know how to do it in a better way.

Have you suggestion to fix my problem?

Stef






Prof. Dr. Stéphane DUCASSE
http://www.iam.unibe.ch/~ducasse/
  "if you knew today was your last day on earth, what would you do 
different? ...  especially if,
  by doing something different, today might not be your last day on 
earth" Calvin&Hobbes

"The best way to predict the future is to invent it..." Alan Kay.

Open Source Smalltalks: http://www.squeak.org, 
http://www.gnu.org/software/smalltalk/smalltalk.html
Free books for Universities at 
http://www.esug.org/sponsoring/promotionProgram.html
Free Online Book at 
http://www.iam.unibe.ch/~ducasse/WebPages/FreeBooks.html