Re: [graphviz-interest] Possible bug in dot

On 7/12/13 12:29 AM, Ron Savage wrote:
> echo "digraph G { a->b }" | dot -Gsize=200,400
>
> Outputs:
>
> digraph G {
>       graph [size="20,40"];
>       node [label="\N"];
>       graph [bb="0,0,54,108"];
>       a [pos="27,90", width="0.75", height="0.5"];
>       b [pos="27,18", width="0.75", height="0.5"];
>       a ->   b [pos="e,27,36.104 27,71.697 27,63.983 27,54.712 27,46.112"];
> }
>
> but that bb and size should be the same.
>
> I'm not familiar with bb, so I'll leave it for you to decide.
>
The bb attribute gives the bounding box of image, in points.
The size attribute specifies the maximum size of the image, in inches.
As the input graph is small, the size attribute has no effect. (Appending a '!' character to the 
size will cause the
output to be scaled uniformly to fit at least one of the size dimensions. In this case, a small 
image will be scaled up.)

I assume either the graph [size="20,40"]; or -Gsize=200,400 is a miscopy, as the numbers should be 
the same.
Also, as the size is in inches, 200,400 and even 20,40 seem a bit large.
> Note: Our discussion started off with this entry in the Changes file, when he tried to use viewport:
>
> February 23, 2004
> ...
> - add -Gviewport="X,Y,Z,x,y"  where XY are the dimensions of a viewport
> ...
>
> But, using V 2.30.1, 'man dot' does not show any reference to viewport.
>
> Was it removed at a later date but not noted in the Changes file?
No, viewport is still available. Try as we might, the "paper" documentation gets out of date. We 
note at the bottom of
the dot man page:

> This man page contains only a small amount of the information related to the Graphviz layout 
> programs. The most
>        complete information can be found at http://www.graphviz.org/Documentation.php, especially 
> in the on-line  ref-
>        erence  pages.
In general, the most reliable information on Graphviz can be found in the On-Line Reference Pages links.

     Emden

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