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st: RE: Drawing an arrow from textbox to point [Stata 8]

From   "Nick Cox" <[email protected]>
To   "Nick Cox" <[email protected]>, <[email protected]>
Subject   st: RE: Drawing an arrow from textbox to point [Stata 8]
Date   Wed, 18 May 2005 09:04:20 +0100

Here is a daft example showing one way to build 
your own arrow as three line segments: 

sysuse auto 

scatter mpg weight, text(41 2650 "top car") 
	|| scatteri 41 2100 41 2500 , lcolor(black) recast(line) 
	|| scatteri 41 2100 41.3 2200, lcolor(black) recast(line) 
	|| scatteri 41 2100 40.7 2200, lcolor(black) recast(line)  legend(off) 

Neat arrows at some orientation other than vertical or horizontal 
would require some trigonometry. The angle between barb and shaft 
looks OK to many tastes at about 30 degrees. Stata 9 uses a default of 
28.6 degrees, better known as 0.5 radian. 

There is more on arrows in Stata 9 in a forthcoming Tip in 
Stata Journal 5(2). 

[email protected] 

Nick Cox 
> Possible, but much easier in Stata 9. 
> In Stata 8, you would need to create
> the elements of an arrow as line segments using 
> calls to various parts of -twoway-. At least, 
> that's the only way I know. 
Raphael Fraser
> > Is it possible to have an arrow directed to a single point 
> from a text box in stata.

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