Message: 12
Date: Wed, 16 Dec 2009 21:47:10 -0800
From: Mark Swindell <[email protected]>
Subject: Re: Deriving an angle from three points
To: How to use Revolution <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
James,
Thanks for this, but starting the Turtle stack did not allow me to
calculate the angle. I got an error each time at "Start Turtle."
Is there a trick to making the library accessible to other stacks?
Mark
Mark,
I think the problem might be that you may have used "Start Turtle"
instead of "StartTurtle"
There should be no spaces. Try just copying and pasting the script
into a button on the Turtle Graphics stack. If you use it outside of
the Turtle Graphics stack, you will need to do a "Start Using stack..."
Hope this helps.
Jim Hurley
On Dec 16, 2009, at 8:08 AM, James Hurley wrote:
Message: 24
Date: Tue, 15 Dec 2009 22:21:47 -0800
From: Mark Swindell <[email protected]>
Subject: Deriving an angle from three points
To: How to use Revolution <[email protected]>
Message-ID: <[email protected]>
Content-Type: text/plain; charset=us-ascii
40,116
98,186
132,118
How would one determine the angle created from three points, such
as those above?
Thanks,
Mark
Mark,
Or even easier. Set the Turtle at the apex and get the angle of the
other two points.
on mouseUp
startTurtle --Initiates the turtle graphics library
penup
setxy 98,186 --The vertex
put direction(40,116) into A
put direction(132,118) into B
put B-A into dA
put abs(dA) & cr & abs(180 - dA) into msg box
choose the browse tool
end mouseUP
(Assuming your middle point is the apex of the angle you want.)
To run this you will need the TG library. Run this in the msg box
go url "http://www.jamesphurley.com/jhurleyFolder/TurtleGraphics.rev";
Jim Hurley
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