Drawing a "Centered" Circle

[xbury.cs at clearstream.com]

Hi Rob,

on mousedown
   set the drawcentered to true
   set the circle's center 
   showcircle
  repeat while the mouse is down
     grab mouseloc
     from center of circle get X or Y max (or min) distance
   end repeat
   hide circle
end mousedown

something like that?
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Xavier Bury
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Rob Cozens <rcozens at pon.net>
Sent by: use-revolution-bounces at lists.runrev.com
17.05.2004 17:05
Please respond to How to use Revolution

 
        To:     How to use Revolution <use-revolution at lists.runrev.com>

        cc: 

        Subject:        Drawing a "Centered" Circle

.








Hi All,

Has anyone given any thought or scripting time to exploring what it
would take to draw a circle that is centered over the loc of the
original mouseDown?

In the course of public presentation I would like to project a map
and allow people in the audience to identify an area on the map by
drawing a circle around it with a mouse.

Using Transcript's oval tool the loc & shape of a circle change as
the mouseLoc changes.  I want the effect of a perfect circle growing
or shrinking around a fixed point as the mouse recedes from or
approaches that point.

At the moment, the approach I'm contemplating involves:

1.  Drawing a minimal circle on mouseDown
2.  Changing the oval tool's ink (or visible property?) to make a new
invisible oval.
3.  On mouseMove change the width & height of the original circle to
the distance between the mouseDown loc and the current mouse loc
4.  On mouseUp delete the invisible oval.

Anyone have any comments or a better solution to offer?

TIA.
--

Rob Cozens
CCW, Serendipity Software Company

"And I, which was two fooles, do so grow three;
Who are a little wise, the best fooles bee."

from "The Triple Foole" by John Donne (1572-1631)
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