How do you save a high resolution image of a trajectory to disk?

[Ian Bowns]

Hi.

It seems that using printing devices such as png("file.png") doesn't print out a plot of a trajectory. Saving the plot from the Viewer pane results in a low-res image being saved.

So, how can I save a high resolution image of a trajectory plot? 

Thanks in anticipation,

Ian

[Iñaki Úcar]

The png() function has a "res" argument (resolution, in ppi), which by
default is 72 ppi (too low). Try to increase it to 150 or 300 ppi.

Iñaki

>
> Thanks in anticipation,
>
> Ian
>
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Iñaki Úcar
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@Enchufa2

[Ian Bowns]

I don't get a file when I use png() is blank file on the plot(.traj). Other plots are fine. 

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[Iñaki Úcar]

El sáb., 11 ago. 2018 a las 22:09, Ian Bowns (<ianb...@gmail.com>) escribió:
>
> I don't get a file when I use png() is blank file on the plot(.traj). Other plots are fine.

Ahm, you are right, because it is not a plot, but an htmlwidget. Take
a look at here: https://github.com/ramnathv/htmlwidgets/issues/95

If you manage to save the SVG (I think I used DiagrammeRsvg or rsvg at
some point), then you can convert it to PNG with any resolution you
may need.

Iñaki

[ianb...@gmail.com]

Thanks.

I'll take a look.

It is particularly important for me to get a reasonable resolution representation of the trajectory, as it is a care pathway for patients. A grainy image is no use when explaining this to the clinical team.

P.S. I'm still having problems getting a realistic simulation of a pathway when events may take a while (several hours), and teams include part-time staff. Will do a separate post on this.

Ian Bowns
E ianb...@gmail.com
M 07793 886943

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[ianb...@gmail.com]

My immediate reaction to the link is I can't understand most of what they're talking about.

Some of what I can, is simply incorrect. For example:

"Use the Export -> Save As Image menu within the RStudio Viewer (this will let the user export a PNG of whatever size they need)."

This is not true. The resolution options are limited and simply not good enough for a complex trajectory.

Not sure I have time for this. I retire very soon!

Ian Bowns
E ianb...@gmail.com
M 07793 886943

-----Original Message-----
From: simmer...@googlegroups.com <simmer...@googlegroups.com> On Behalf Of Iñaki Úcar
Sent: 11 August 2018 21:41
To: simmer-devel <simmer...@googlegroups.com>

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[Iñaki Úcar]

This works for me:

library(simmer.plot)
library(DiagrammeRsvg)
library(rsvg)

x <- trajectory() %>%
seize("res", 1) %>%
timeout(1) %>%
release("res", 1) %>%
rollback(3)

p <- plot(x)
svg <- charToRaw(export_svg(p))
rsvg_png(svg, "out.png", width=2000)

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[ianb...@gmail.com]

It also works for me. Thanks Iñaki.

Ian

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