Re: [R] Plot to a device and examine the plot?

Thanks for the suggestion. I believe it is exactly what I need. I will try this function. Thanks! Regards, Shu Fai On Mon, Oct 16, 2023 at 3:39 AM Paul Murrell wrote: > > Hi > > You could also look at dev.capture(), depending on which screen device > you are using. > > Paul > > On 16/10/23

Re: [R] Plot to a device and examine the plot?

Thanks a lot for introducing these functions! I am not aware of them but it seems that they can help me to do what I want to do. Regards, Shu Fai Regards, Shu Fai Cheung (張樹輝) On Mon, Oct 16, 2023 at 12:24 AM Duncan Murdoch wrote: > > On 15/10/2023 12:05 p.m., Shu Fai Cheung wrote: > > Let me

Re: [R] Plot to a device and examine the plot?

Hi You could also look at dev.capture(), depending on which screen device you are using. Paul On 16/10/23 05:24, Duncan Murdoch wrote: On 15/10/2023 12:05 p.m., Shu Fai Cheung wrote: > Let me clarify my question: > > plot.new() > polygon(c(.5, .5, .75, .8), c(.25, .3, .4, .5)) > > If

Re: [R] Plot to a device and examine the plot?

On 15/10/2023 12:05 p.m., Shu Fai Cheung wrote: Let me clarify my question: plot.new() polygon(c(.5, .5, .75, .8), c(.25, .3, .4, .5)) If the device is an on-screen device, can I check whether a particular area has anything drawn on it, or, to be precise, whether the color of a particular area

Re: [R] Plot to a device and examine the plot?

Let me clarify my question: plot.new() polygon(c(.5, .5, .75, .8), c(.25, .3, .4, .5)) If the device is an on-screen device, can I check whether a particular area has anything drawn on it, or, to be precise, whether the color of a particular area has all pixels equal to the background color.

Re: [R] Plot to a device and examine the plot?

Sorry that I did not make my question clear enough. If the device is file based (e.g., a PNG file), then I believe I can do that, by using functions that can inspect an image. This is the solution I originally wanted to try. However, it requires creating a file in the process. I would like to

Re: [R] Plot to a device and examine the plot?

This question is not clear to me. What is it you hope to retrieve from the device? Note that the type of device in your example is system-dependent. The content in a png() would be different than the content in a win.graph() device. On October 15, 2023 8:04:00 AM PDT, Shu Fai Cheung wrote:

[R] Plot to a device and examine the plot?

Hi All, I want to inspect the content of a plot generated by another function. For example: plot.new() polygon(c(.5, .5, .75, .8), c(.25, .3, .4, .5)) A polygon will be drawn. If I do not know what has been done to generate the plot, is it possible to query the content in the active device?