[R] Bar Plot ggplot2 Filling bars with cross hatching

[Duncan Murdoch]

Rolf Turner wrote:
> On 20/01/2009, at 1:46 PM, Duncan Murdoch wrote:
>
>   
>> On 19/01/2009 7:36 PM, stephen sefick wrote:
>>     
>>> what is your suggestion for distinguishing between many bars without
>>> color?  I have grown up in the time of standarized tests - good or  
>>> bad
>>> I never felt nauseous.
>>>       
>> Use gray levels or labels.  If "many" is bigger than 5, it's not going
>> to be easy, whatever method you are using.
>>     
>
> 	I disagree.  Grey levels suck; labels are a kludge.  It is an issue
> 	for ``many'' == 2, for which crosshatching works perfectly.
>   
Could you show an example?

There are several BW examples in example(barplot), and the gray ones 
look better on screen than the cross-hatched one.  (Not to say it makes 
a very good choice of cross-hatching, but I suspect the gray examples 
will look better than any 5 cross-hatch patterns.)  I haven't tried 
printing the examples, so I'm not sure the gray would reproduce well on 
paper; I wouldn't try to print those 5 gray levels on a typical printer.

Duncan Murdoch
> 		cheers,
>
> 			Rolf
>
>   
>> Duncan Murdoch
>>
>>     
>>> Stephen
>>>
>>> On Mon, Jan 19, 2009 at 5:20 PM, Greg Snow <Greg.Snow at imail.org>  
>>> wrote:
>>>       
>>>> I think the fact that the grid package does not support cross- 
>>>> hatching is a feature not a bug (or deficiency), and I hope that  
>>>> this is not "fixed".  Tufte's book (The Visual Display of  
>>>> Quantitative Information) has a section on why cross-hatching  
>>>> should be avoided (unless of course your goal is to induce nausea  
>>>> in the observer rather than convey information).
>>>>
>>>> I would edit Hadley's statement below to say "fortunately there's  
>>>> no way to do this in ggplot2".
>>>>
>>>> --
>>>> Gregory (Greg) L. Snow Ph.D.
>>>> Statistical Data Center
>>>> Intermountain Healthcare
>>>> greg.snow at imail.org
>>>> 801.408.8111
>>>>
>>>>
>>>>         
>>>>> -----Original Message-----
>>>>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
>>>>> project.org] On Behalf Of hadley wickham
>>>>> Sent: Thursday, January 15, 2009 10:55 AM
>>>>> To: stephen sefick
>>>>> Cc: R-help
>>>>> Subject: Re: [R] Bar Plot ggplot2 Filling bars with cross hatching
>>>>>
>>>>> Hi Stephen,
>>>>>
>>>>>           
>>>>>> #I am putting a test together for an introductory biology class  
>>>>>> and I
>>>>>> would like to put different cross hatching inside of each bar  
>>>>>> for the
>>>>>> bar plot below
>>>>>>             
>>>>> ggplot2 uses the grid package to do all the drawing, and currently
>>>>> grid doesn't support cross-hatching, so unfortunately there's no  
>>>>> way
>>>>> to do this in ggplot2.
>>>>>
>>>>> Regards,
>>>>>
>>>>> Hadley
>>>>>
>>>>> --
>>>>> http://had.co.nz/
>>>>>
>>>>> ______________________________________________
>>>>> R-help at r-project.org mailing list
>>>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>>> PLEASE do read the posting guide http://www.R-project.org/posting-
>>>>> guide.html
>>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>>           
>>>
>>>       
>> ______________________________________________
>> R-help at r-project.org mailing list
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>>     
>
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