Drawing a "Centered" Circle

[Jim Lyons]

Rob asked:
> 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?

Make an oval graphic and call it "circ", then put this into the card 
script:

local centerPoint

on mouseDown
   put the mouseLoc into centerPoint
   hide grc "circ"
end mouseDown

on mouseMove x,y
   if centerPoint is empty then exit mouseMove
   put sqrt((x-item 1 of centerPoint)^2 + (y-item 2 of centerPoint)^2) 
into radius
   set the width of grc "circ" to 2*radius
   set the height of grc "circ" to 2*radius
   show grc "circ" at centerPoint
end mouseMove

on mouseUp
   put empty into centerPoint
end mouseUp

You can modify as needed to show or hide the graphic when you want. HTH.

Jim Lyons