Re: Adding an _arc() terminal entry

[Christoph B. <us...@be...>]

Am 19.04.2013 20:56, schrieb Ethan A Merritt:
> On Thursday, April 18, 2013 11:26:31 pm Christoph Bersch wrote:
>>
>> Yes, I saw this, but didn't know if this information was supposed to be
>> transparent to the terminal drivers.
>
> The word "transparent" has unfortunately become ambiguous in
> [American] English.  I don't know whether you mean "supposed to be
> easily inspected by terminal drivers" or "supposed to be invisible
> to terminal drivers".

I didn't know, if this information was supposed to be easily inspected 
by terminal drivers.

> I think it is preferable to have the core
> code do the clipping so that the result is not terminal-dependent.

Yes, I agree, although additionally allowing terminal-dependent clipping 
would give better results in some cases (e.g. proper clipping of line ends).

I just submitted a patch for improved polygon clipping in the core code 
to sf http://sourceforge.net/p/gnuplot/bugs/1237/

>
> I'm OK with the idea of adding a TBOOLEAN clip property for "set object".

I would like to see this.

Another point related to clipping is different handling of the border of 
a clipped rectangles vs clipped polygon:

reset
set lmargin at screen 0.5
set xrange[0:2]
set yrange[0:2.5]
set macro
obj_style = 'fillstyle empty border lc rgb ''red'' lw 5'
set object rectangle from first -1,1 to 1,0.5 @obj_style
set object polygon from first -1,1.5 to 1,1.5 to 1,2 to -1,2 @obj_style
set object 2 @obj_style
plot x


Christoph