Is there an option to turn on a tick mark along the time line of plots for sunrise and sunset?

[DR]

I cannot recall reading about such an option, or seeing it discussed,
but again my search skills aren't as sharp as some here.


I'm looking for a way to have a little tick mark along the hours on the
plots, or some of them at least, to indicate local sunrise and sunset. 
Just for the day would be OK, so nothing heavy duty on multiple day or
monthly plots.


It could be a little vertical mark, no need to write sunset or sunrise
by it since there isn't a lot of room there but especially for solar
radiation plotting it would be fun to have.

Dale

[Vince Skahan]

https://weewx.com/docs/5.2/reference/skin-options/imagegenerator/?h=show_da#image_background_color

Gets you highlighted day night bands which is along the same lines.....

[DR]

Vince,

Indeed this is one of the coolest things  among so many that I saw when
I first heard of WeeWx and began setting it  up with my data.

Initially I tried blue  and yellow for color options but kept coming
back to what the designers set as the default.  But I digress.


It is very close but there is a bit of 'fuzziness' which I think
represents twilight and I can also look over at the Celestial to see
when the calculated sunrise/set is locally, too.


I just began paying attention to this when I got a station with solar
radiation working, turned on the max calculated solar and wondered how
close that was to what was being observed by the pyranometer.


In any event there is little more to add to this robust program you've
come up with and am having fun playing with it.  All I was trying to do
was emulate the little tick marks that Brian had in his Weather Display
graphing.

Thanks for the prompt reply and keep having fun.   Dale

[Tom Keffer]

Sounds like a good option to put in the image generator. See function _renderDayNight() in file weeplot/genplot.py. A PR would be welcome.

-tk

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[DR]

Thanks for the pointer.  I was looking at the info Vince pointed me to
and I see that 'somehow' the image generator knows where day/night
begins and fuzzes it out a bit to represent twilight.  I just found that
section and will do some looking.  It might be simple enough for me to
figure out and report back.  Dale

[DR]

Would this be the code to study to try to figure out a 'simple'
solution, especially the last four lines?


    def _renderDayNight(self, sdraw):
        """Draw vertical bands for day/night."""
        (first, transitions) = weeutil.weeutil.getDayNightTransitions(
            self.xscale[0], self.xscale[1], self.latitude, self.longitude)
        color = self.daynight_day_color \
            if first == 'day' else self.daynight_night_color
        xleft = self.xscale[0]
        for x in transitions:
            sdraw.rectangle(((xleft,self.yscale[0]),
                             (x,self.yscale[1])), fill=color)
            xleft = x
            color = self.daynight_night_color \
                if color == self.daynight_day_color else
self.daynight_day_color
        sdraw.rectangle(((xleft,self.yscale[0]),
                         (self.xscale[1],self.yscale[1])), fill=color)
        if self.daynight_gradient:
            if first == 'day':
                color1 = self.daynight_day_color
                color2 = self.daynight_night_color
            else:
                color1 = self.daynight_night_color
                color2 = self.daynight_day_color
            nfade = self.daynight_gradient
            # gradient is longer at the poles than the equator
            d = 120 + 300 * (1 - (90.0 - abs(self.latitude)) / 90.0)
            for i in range(len(transitions)):
                last_ = self.xscale[0] if i == 0 else transitions[i-1]
                next_ = transitions[i+1] if i < len(transitions)-1 else
self.xscale[1]
                for z in range(1,nfade):
                    c = blend_hls(color2, color1, float(z)/float(nfade))
                    rgbc = int2rgbstr(c)
                    x1 = transitions[i]-d*(nfade+1)/2+d*z
                    if last_ < x1 < next_:
                        sdraw.rectangle(((x1, self.yscale[0]),
                                         (x1+d, self.yscale[1])),
                                        fill=rgbc)
                if color1 == self.daynight_day_color:
                    color1 = self.daynight_night_color
                    color2 = self.daynight_day_color
                else:
                    color1 = self.daynight_day_color
                    color2 = self.daynight_night_color
        # draw a line at the actual sunrise/sunset
        for x in transitions:
            sdraw.line((x,x),(self.yscale[0],self.yscale[1]),
                       fill=self.daynight_edge_color)

[Tom Keffer]

Yes, that's it.

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