cylindrect: Display an apparent cylinder

Description Usage Arguments Details Value Author(s) See Also Examples

View source: R/cylindrect.R

Description

Display rectangles shaded to appear like cylinders.

Usage

1
 cylindrect(xleft,ybottom,xright,ytop,col,border=NA,gradient="x",nslices=50)

Arguments

xleft

The position of the left side of the rectangle(s).

ybottom

The position of the bottom of the rectangle(s).

xright

The position of the right side of the rectangle(s).

ytop

The position of the top side of the rectangle(s).

col

The base color(s) of the rectangles.

border

Whether to draw a border and what color.

gradient

Whether to vary the shading horizontally ("x" - the default) or vertically (anything but "x").

nslices

The number of "slices" of color for shading.

Details

cylindrect displays a rectangle filled with "slices" of color that simulate the appearance of a cylinder. The slices are calculated so that the base color appears at the right or bottom edge of the rectangle, becomes progressively lighter to a "highlight" at two thirds of the width or height and then darkens toward the base color again.

The appearance is of a cylinder lit from above and to the left of the viewer. The position of the apparent light source is hard coded into the function.

Value

The base color(s) of the rectangle(s).

Author(s)

Jim Lemon

See Also

gradient.rect

Examples

1
2
3
4
5
 plot(0,xlim=c(0,5),ylim=c(0,5),main="Examples of pseudocylindrical rectangles",
  xlab="",ylab="",axes=FALSE,type="n")
 cylindrect(0,0,1,5,"red")
 cylindrect(rep(1,3),c(0,2,4),rep(4,3),c(1,3,5),"green",gradient="y")
 cylindrect(4,0,5,5,"#8844aa")

plotrix/plotrix documentation built on Jan. 23, 2020, 1:38 p.m.