Re: plot & print

[Ben Abbott]

On Nov 14, 2009, at 3:52 AM, Alain Content wrote:

> This is most likely a very stupid beginner's question, but still :
> 
> I use octave to generate geometrical objects, and need accurate control of 
> their size in pixels. 
> The way I do that is to plot a figure and then print it.
> For instance, to generate, say, a 500 pixel square : 
>       plot ([-1,-1,1,1,-1], [-1,1,1,-1,-1])  # a square
>       print ("-dpng", "-S500,500", "sq.png")  # generate file
> 
> However, this method generates margins around the objects, and I can't find 
> how to control the size of those margins (or suppress them).
> Alternatively, could one tell me how these margins are sized ?
> 
> Thanks in advance, 
> Alain

The graphics backend has had a lot of changes recently. If you are running 
version 3.2.x then you can have the axis box fill the figure by ...

        plot ([-1,-1,1,1,-1], [-1,1,1,-1,-1])  # a square
        set (gca, "position", [0 0 1 1])
        print ("-dpng", "-S500,500", "sq.png")  # generate file

If you are running 3.0.x, I don't know how to do what you want.

Ben