Message: 8
Date: Thu, 2 Apr 2009 14:52:04 +0100
From: David Bovill <[email protected]>
Subject: Creating complex graphic objects
To: How to use Revolution <[email protected]>
Message-ID:
        <[email protected]>
Content-Type: text/plain; charset=ISO-8859-1

I've a couple of shapes that I need to create for an app that lend
themselves to the use of the graphic control - because I want them at
various sizes and also because they use "markers" on a graphic shape. The
problems is the complexity of tweaking the points by hand. I know of
experiments importing geometry from apps like Illustrator - but was
wandering if anyone has any examples / a library of shapes or techniques to
make this easier?

For instance the shapes I need are "stars" - that I can dynamically colour.
By roughly drawing a star and then:

set the editmode of the selectedobject to "polygon"

I can tweak the shape manually which helps a lot.

But when it comes to more complex structures it would be good to draw them
in illustrator and import the geometry.

For instance - I also want to create circles with variable numbers of evenly spaced marker points(iIdeally the arcs would have arrows on them to indicate a clockwise flow). It would be "nice" not to have to create these as images at different scales and import them from an external app - but AFAIK its not
really practical at the moment. Any suggestions?



David,

You may want to consider Turtle Graphics. (See http:// www.jamesphurley.com/runrev.html)

Here, for example is the script for drawing a circle with evenly space arrows along the perimeter:

on mouseUp
   put 90 into tNumPoints
   startTurtle

   repeat with i = 1 to tNumPoints
      forward 10
      left 360/tNumPoints
      if i mod 10 is 0 then
         drawArrow 10,15
      end if
   end repeat

   choose the browse tool
end mouseUp

on drawArrow tLength,tAngle
   right tAngle
   back tLength
   forward tLength
   left 2*tAngle
   back tLength
   forward tLength
   right tAngle
end drawArrow

You can create either an image or a vector graphic. Stars would be easy as well.

JIm Hurley









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