Re: [Lcd4linux-devel] Histograms

[Scott F. <sc...@st...>]

On Tue, May 19, 2009 at 7:57 AM, Michael Reinelt <mi...@re...>wrote:

> Hi Scott,
>
> > Well, it was an experiment. I wanted to make it complicated I guess.
> > That part in define_chars is broken. That's what I was working on when I
> > took a break to check email. Anyhow, I envisioned a left and right half
> > per each character cell. Not a good idea? Dealing with 2 values makes
> > more sense on a graphical LCD with color settings.
>
> Well, I thought a histogramm would have one expression as a value, and this
> (historic) value is sort of "scrolled" to
> the left (or the right or...)


Well it certainly simplifies things going with one value. All histograms
I've seen have had one value. I just wanted to be difficult. I'll cut this
back to a single value, still using the bars structure.


>
>
> >     - you can specify the length of a histogram (as with bars), but
> >     shouldn't there be something like a "width"? Looks like
> >     you're always using the whole size of the display.....
> >
> >
> > What would be the difference between width and length? When I setup a
> > histogram with length of 5, the histogram stays within those limits, and
> > I can place a widget after it. I used this length in adjusting bar
> > cells. One cell is discarded each pulse. I may have missed parts where
> > an index may fall out of range, but it shouldn't be using the whole
> > screen. If it is, point me to the code and I'll figure something out.
>
> I could not test it, I just wondered.
>
> think of a display with 8 rows and 40 columns.
>
> Now I want to place some text in the top line, and below place two
> histograms, 7 rows in height, and 19 columns in width
> (19 columns to get a gap between the two widgets). Say the histogramm is
> heading North (i.e. bars starting at the
> bottom, heading top)
>
> The "length" of the bars would be 7 cells, so one would specify "length 7"
> (or whatever the property is called)
>
> But how would I specify the width of the widget? I couldn't see any
> parameter or attribute for this....
>

Oh I see. In that case width is one character cell (according to the patch).
I wasn't thinking along the same lines. I was viewing a histogram as being
one cell heigh, and "length" many columns wide for horizontal bars. Vertical
bars are one cell wide, and "length" many cells high. I wasn't going to add
support for vertical histograms at first, but I went ahead and coded in
parts leading towards them.


>
>
>
>
> --
> Michael Reinelt <mi...@re...>
> http://home.pages.at/reinelt
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