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,
Here is how easy this is in Turtle Graphics:
on mouseUp
startTurtle --Initiates the turtle graphics library
penup
setxy 40,116
pendown
put direction(98,186) into tStartAngle
setxy 98,186
put direction(132,118) into tEndAngle
setxy 132,118 --Not necessary, but visually satisfying
put tEndAngle - tStartAngle into dA
put dA & cr & 360 - 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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