Re: Peculiarities in demo plots

[sfeam <sf...@us...>]

On Sunday, 19 April 2015 11:51:22 PM Daniel J Sebald wrote:
> Forgot one:
> 
> imageNaN.dem
>    Treatment of missing/undefined/NaN/Inf data: Qt and x11 plots look 
> similar except for first column.
>               Qt: (top to bottom) black, yellow, white, blue, white, blue
>               x11: (top to bottom) black, yellow, black, blue, black, blue
>    image from non-matrix data: The x11 plot has a black pixel left, 
> second from top so the text "NaN should appear as background" is not 
> visible.
>    negative values mapped to log-scale colorbar: Same sort of thing for 
> x11, the "Negative values become NaN..." is not visible.

Right. That's the point of having the demos - they serve as unit tests
for the various code features.  In this case it shows that the x11 terminal
does not handle NaN in image data optimally.  That's at least partly because
the x11 terminal doesn't handle transparency, so there is not the option
of mapping NaN to "all-transparent".

The PostScript terminal exhibits the same deficiency.
In both cases the terminal is just showing it's age.
The newer options (qt/cairo) are more capable.

	Ethan



> 
> 
> On 04/19/2015 11:08 PM, Daniel J Sebald wrote:
> > I stepped through the demos to see what is new and test whether a change
> > I made affected anything.  Below is a list of items that seem like
> > bugs/flaws compared to what I recall of the demos from years ago.  I
> > haven't investigated any of these issues.  Should we break these up into
> > bug reports somehow?
> >
> > Dan
> >
> >
> > random.dem:
> >     (Clarification, this is only for Qt, x11 looks as I remember)
> >     Lattice test for random numbers: blank (or points are single pixel
> > which I can't see amongst the dust on my monitor)
> >     Lattice test for random numbers: blank
> >     Gaussian 3D cloud of 3000 random samples: blank
> >
> > scatter.dem:
> > Hit return to continue (5)
> >            "scatter.dem", line 45: warning: Cannot contour non grid data.
> > Please use "set dgrid3d".
> >
> > pm3d.dem:
> >     (Let me clarify the following: all of these cases are for the Qt
> > terminal,
> >      the x11 terminal has the file name front-most in the plot)
> >     Datafile with different nb of points in scans; pm3d flush begin: file
> > name is behind the plot element (reads 'gle.dat')
> >     Datafile with different nb of points in scans; pm3d flush center:
> > file name is behind the plot element (reads 'dat')
> >     Datafile with different nb of points in scans; pm3d flush scans: file
> > name is obscured by the plot element
> >     Datafile with different nb of points in scans; pm3d ftriangles flush
> > begin: file name is obscured by the plot element
> >     Datafile with different nb of points in scans; pm3d ftriangles flush
> > center: file name is obscured by the plot element
> >     Datafile with different nb of points in scans; pm3d ftriangles flush
> > end: file name is obscured by the plot element
> >     Using interpolate with datafile; pm3d map interpolate 2,1: file name
> > is behind the plot element (reads 'gle.dat')
> >     Using interpolate with datafile; pm3d map ftriangles interpolate
> > 10,1: name is obscured by the plot element
> >     color lines: 'splot sin(y)/(y) with lines palette': The color bar
> > text goes off the window screen.  I see that quite often and don't
> > recall this from years back...maybe font is bigger
> >
> > heatmaps.dem
> >     Heat Map generated from a file containing Z values only: blank, color
> > bar correct (this is only for Qt terminal, x11 looks good)
> >     Compare 'image' and 'image pixels' mode: On my system, there are
> > white spaces between pixels (this is only for Qt terminal, x11 looks
> > good, I think I've encountered this before as a graphics driver
> > implementation of OpenGL (Mesa) issue)
> >
> > hypertext.dem
> >     Sweet!
> >     While the Qt terminal has yellow filled circle with slightly darker
> > yellow/brown outline, the x11 terminal has yellow filled circles with
> > black outline and a black dot at the center of each circle (not the best
> > looking circle either, but that's x11's problem, I guess).
> >
> > Image Formats
> >     As with 3d color surfaces, a color box may be added to the plot:
> > blank, color box goes off edge of screen  (Appears to be Qt only)
> >     Matrix binary data (gnuplot binary) translated: the box around the
> > key extends so far to the left, wish that font-size issue could be fixed
> > somehow
> >
> >     The two images after "End of image demo...": can't see key amongst
> > black background
> >
> >     Same thing in 3D mode (First column contains various odd values):
> > blank and only two borders visible
> >     3D image with pixel value in 4th column: blank and only two borders
> > visible
> >
> > ellipses_style.dem
> >     Four-column form: x y major_diameter: The _d of two "diameter"s is
> > treated as subscript and doesn't read easily
> >     Five-column form:  The _d of two "diameter"s is treated as subscript
> > and doesn't read easily
> >
> > key.dem
> >     Key (<manual>  vert left top): The plot border appears to be the
> > top-most element, while all other plot elements appear behind the key.
> > I don't recall this from the past.
> >
> > rectangle.dem
> >     There are the following differences between Qt temrinal and x11 terminal:
> >     Qt: The rectangle labeled "There should be a clipped rectangle here"
> > has a white fill background
> >     x11: The said rectangle has no white fill, just the biege of the plot
> > showing through
> >     Qt: The hashmark fill pattern box from (2,-3) to (0,-2) has no
> > background (biege shows through)
> >     x11: Said pattern box has a white fill background showing through the
> > hash pattern
> >
> >
> > ------------------------------------------------------------------------------
> > BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT
> > Develop your own process in accordance with the BPMN 2 standard
> > Learn Process modeling best practices with Bonita BPM through live exercises
> > http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_
> > source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF
> > _______________________________________________
> > gnuplot-beta mailing list
> > gnu...@li...
> > Membership management via: https://lists.sourceforge.net/lists/listinfo/gnuplot-beta
> >
> 
>