rendering maps outside R studio

[thibautjombart]

Trying the tutorial on github, I get:

> quickMap(cholera$deaths, col.by="Count", size.by="Count")
Warning message:
In writeMap(bbm, x.map, ...) :
  Cannot render in HTML viewer pane (require RStudio v.>0.98.5).
              Use 'directView' argument to render into your browser.

This was running R from a terminal, not inside RStudio which I suspect works. Would be cool to render to the default browser by default.

[fkeck]

You can pass the directView argument to quickMap via the "..."
So this should work:

quickMap(cholera$deaths, col.by="Count", size.by="Count", directView = "browser")

Normally, rleafmap checks if the user is using Rstudio and adapts its behaviour. Something is wrong here, I will try to have a look.

[thibautjombart]

works, thanks!

[joanna-lewis]

Works for me too using directView = "browser", but not automatically.
A couple of other rendering issues: I found that heatMap produced a graph that's initially very zoomed-out. Is this the behaviour you would expect? I also don't see any colours, even when heat.map in the top-right is ticked.
Thanks!

[fkeck]

Are you using RStudio Joanna? Or something else?
If you use Rstudio, do you get the map directly in the viewer pane?

For the zoom problem, it's normal (but not the best I agree). The problem is that rleafmap automatically set the zoom and position to fit all the data of the map. Here the result is not good because the largest element is the colored grid which cover a very large surface (even if not working you can see its geographical extent). A solution is to set manually setZoom.

I don't now why you don't see the colored grid. Looks like the image is not generated or the link is wrong. Could you send me the HTML which is generated by heatMap?

[joanna-lewis]

I'm using the Mac GUI (the one you get when you download R - I'm not even sure what it's called!) So the map is appearing in a browser (Firefox).

I'm attaching the html that was generated.
_map.html.txt

[fkeck]

Ok, I couldn't reproduce the bug and I have no idea what's happening here.
Do you have this png file created : [working directory]/_data/_rasters/_heatmap.png ?
Can you try to open the HTML directly from your file manager, and with Safari ?

[joanna-lewis]

The colours are also missing when I open it in Safari, and the png file is not there (but the _rasters folder is). So looks like that is the problem.

[fkeck]

Hi Joanna, I suspect this is because I forced to use the png function with the cairo library and the latter may be not available for you. I just patched rleafmap to fix this issue. Can you try to reinstall rleafmap from GitHub

remove.packages("rleafmap")
devtools::install_github("fkeck/rleafmap")

And then try the example again.

[thibautjombart]

Incidentally, what is the official supported browser? On most shiny apps,
and a few js app I have tested, chrome was substantially faster than
firefox.
It will probably be useful to put a disclaimer out: only xxx supported. We
don't want to open the can of worms of browser specific issues.. ;)

On Thu, Oct 29, 2015 at 10:43 AM, fkeck [email protected] wrote:

Hi Joanna, I suspect this is because I forced to use the png function with
the cairo library and the latter may be not available for you. I just
patched rleafmap to fix this issue. Can you try to reinstall rleafmap
from GitHub

remove.packages("rleafmap")
devtools::install_github("fkeck/rleafmap")

And then try the example again.

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[fkeck]

Theoretically all the browsers supported by Leaflet are ok : Chrome, Firefox, Safari 5+, Opera 12+, IE 7–11. This can be added somewhere.
I usually do my tests with Firefox and Chromium.

[joanna-lewis]

Awesome, it's working now :) Thank you!