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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?
P.S.
Turtle Graphics is simpler but here is another way:
Use the following script to create a circle:
on mouseUp
set the style of the templateGraphic to "line"
if there is no grc "circ" then create grc "circ"
put 100 into tR -- the radius
put 0 into tA -- the angle
put 100 into tNumPoints--or whatever you need for your resolution
put round(360/tNumPoints) into da
put the loc of this card into tLoc
put item 1 of tLoc into x0
put item 2 of tLoc into y0
repeat tNumPoints
put tR * cos(tA*pi/180) into x
put tR*sin(tA*pi/180) into y
put round(x0+x) & comma & round(y0+y) & cr after results
add da to tA
end repeat
set the points of grc "circ" to results
end mouseUp
Then take the points of the circle (in the variable results) to
extract say the 10th and 14th points.
Create a new graphic using these two points and set the end arrow to
true.
Do this periodically throughout the repeat loop--every so often pick
a pair of points, create a new grc and set the end arrow to true.
Voila, a circle with arrows.
Jim Hurley
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