Re: Request for a test in Matlab

[Pantxo Diribarne]

2017-10-25 11:57 GMT+02:00 Richard Crozier <address@hidden>:

On 25/10/17 09:29, Pantxo Diribarne wrote:

2017-10-24 23:51 GMT+02:00 Richard Crozier <address@hidden <mailto:address@hidden>>:

    On 24/10/17 22:44, Pantxo Diribarne wrote:

        Hi,

        Could someone test the following code in ML. We would like to
        see how the text background area behaves when it crosses the
        axes back planes with or without clipping enabled (see
        https://savannah.gnu.org/bugs/?39692
        <https://savannah.gnu.org/bugs/?39692>).

        ---

        clf
        set (gca, 'color', 'b');
        ht = text (.5, .5, 'toto', 'backgroundcolor', 'r', 'margin', 20);
        xlim ([0 3])
        ylim ([0 3])
        surface ();
        view (90, 35);
        drawnow
        c = getframe (gcf);
        imwrite (c.cdata, 'view_90_35.png');
        view (0, 26.8)
        drawnow
        c = getframe (gcf);
        imwrite (c.cdata, 'view_0_26.8.png');
        set (ht, 'clipping', 'on')
        drawnow
        c = getframe (gcf);
        imwrite (c.cdata, 'view_0_26.8_clipping.png');

        ---

        The script should generate 3 png files with figure captures.

        Pantxo


    MATLAB Version: 9.1.0.441655 (R2016b)
    Operating System: Linux 4.4.0-83-generic #106~14.04.1-Ubuntu SMP Mon
    Jun 26 18:10:19 UTC 2017 x86_64
    Java Version: Java 1.7.0_60-b19 with Oracle Corporation Java
    HotSpot(TM) 64-Bit Server VM mixed mode


    Richard

    --     The University of Edinburgh is a charitable body, registered in
    Scotland, with registration number SC005336.


Thanks Richard. So it looks like  Matlab disables depth testing for text objects or at least for the background area.
In order to confirm this, could you please run the following and post the png here:

----
clf
peaks ();
for p = -3:3
   text (p, p, p, 'toto', 'backgroundcolor', 'r', 'margin', 20);
end
drawnow ()
c = getframe (gcf);
imwrite (c.cdata, 'peaks_and_text.png');
----

Thanks in advance.

Pantxo

here you go

Richard

--
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.

Thanks for the fast reply! So contrary to what I thought the depth test is not disabled for text objects. In fact it looks like the axes planes are drawn first, then the depth buffer is cleared and children objects are drawn, then the the depth buffer is cleared again and the tick marks are drawn (if the "layer" of the axes is property is "top").

Pantxo