Deriving an angle from three points

[Mark Swindell]

Thanks.  I neglected to include the "start using" command.  

Mark

On Dec 17, 2009, at 11:18 AM, James Hurley wrote:

>> 
>> Message: 12
>> Date: Wed, 16 Dec 2009 21:47:10 -0800
>> From: Mark Swindell <mdswindell at cruzio.com>
>> Subject: Re: Deriving an angle from three points
>> To: How to use Revolution <use-revolution at lists.runrev.com>
>> Message-ID: <3CEB9DD4-D059-43B4-8A77-2F4E86C4820D at cruzio.com>
>> 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 <mdswindell at cruzio.com>
>>>> Subject: Deriving an angle from three points
>>>> To: How to use Revolution <use-revolution at lists.runrev.com>
>>>> Message-ID: <B3725793-6274-4F53-91D2-3154D31F9CDF at cruzio.com>
>>>> 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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>> 
> 
> 
> 
> 
> 
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