Re: Placing data into Setpos [ ]

[Alain LCSI <alain@xxxxxxx>]

Hi!

Setpos wants a list as input:
setpos [100 100]

If the position is determined by variables, you cannot enclose the  
variables within brackets. You have to "build" the list using your  
variables:
setpos se :a :b
se means sentence. It takes the two inputs :a :b and builds a  
sentence (a list, really). That being done, it passes the resulting  
list to setpos, who will be happy with this.

Other examples of constructions:

setpos se (xcor + 10) ycor
setpos se (:a + 1) (:b + 1)
setpos ask "t1 [pos]
setpos se (ask "t1 [xcor]) ycor
setpos se (xcor + slider1) (ycor + slider2)

The parenthesis here are just playing cute, but sometimes they are  
required to "force" a proper parsing of the instruction. Get used to  
using them.

Other options:
check setpos in Help/ Vocabulary

Alain Tougas
alain@xxxxxxx




Le 07-02-18 à 00:54, rwege@xxxxxxxxxxxxxxxxxxxxxxx a écrit :

> Hi mwforum,
>
> I am working on Dynaturtle, which is a spacecraft simulation
> wherein the turtle drifts independent of the heading and it
> responds to "kicks" of the engine in the back. Speed and
> direction are controlled by the force vector produced by the
> engine. I am translating an old Apple II version of this into
> Microworlds EX and  some commands have changed, Setpos being one.
> It used to be SETXY. It uses XCOR AND YCOR to develop data for
> setting the position of the turtle at any point in time. I am not
> able to make SETPOS take any data though. It will not accept
> variables. For instance, it won't take SETPOS [:A :B], nor will
> it take SETPOS [XCOR YCOR].
> The question is: What is the syntax for getting data into the
> SETPOS [] command?
>
> Ralph Wege