[R] Draw Polygon with a Circular Side

[ermimi]

Thank you very much Jim for you help!!Your help was my need!!
I have create this function to draw a polygon with a circular side

 DrawPortion<-function(init,finish,length_){
  	plot(0,xlim=c(-10,10),ylim=c(-10,10),xlab="",ylab="",type="n",axes=TRUE)
        
       
polygon(c(0,length_*cos(seq(ToRadians(finish),ToRadians(init),length.out=50))),
       
c(0,length_*sin(seq(ToRadians(finish),ToRadians(init),length.out=50))),
        border="#ffaaaa",col="#66ee33") 
       }


ToRadians<-function(grades){
	radians=(grades/180*pi);
	return(radians);
	}
		
Thank you very much Jim

A Greetings Luismi


Jim Lemon-2 wrote:
> 
> ermimi wrote:
>> Hello Friends!!!
>> 
>> I would want draw a circular histogram, and I would like draw a polygon
>> with
>> a circular side. This is easy if I use the functions polygon and arc, but
>> I
>> want that the polygon with a circular side have background colour. The
>> polygon created with function polygon can have background colour, but the
>> surface created with function arc can´t have background colour.
>> How I could create a polygon with a circular side that have background
>> colour?? 
>> Thank you very much,  
>> A greetings Luismi
> 
> Hi Luismi,
> The phrase "circular histogram" brings to mind something like a wind 
> rose. There are a few you could try:
> 
> windrose in the oce and circular packages
> 
> rosavent in the climatol package
> 
> oz.windrose in the plotrix package
> 
> and perhaps rose in the IDPmisc package
> 
> Now about this "polygon with a circular side". I think you mean the 
> standard issue polygon like a rectangle except that one side is a 
> circular arc instead of a straight line. If this bold conjecture is 
> correct, here is an example for you:
> 
> plot(0,xlim=c(-1,1),ylim=c(-1,1),xlab="",ylab="",
>   type="n",axes=FALSE)
> polygon(c(0,-1,-1,0,cos(seq(pi/2,0,length.out=50)),
>   cos(seq(2*pi,3*pi/2,length.out=50))),c(-1,-1,1,1,
>   sin(seq(pi/2,0,length.out=50)),sin(seq(2*pi,3*pi/2,length.out=50))),
>   border="#ffaaaa",col="#66ee33")
> 
> Jim
> 
> ______________________________________________
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> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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