xlimFromYlim {viscomplexr} | R Documentation |
Adjust xlim to ylim
Description
This simple function is useful for adjusting x and y coordinate ranges
xlim
and ylim
in order to maintain a desired display ratio. The
latter must be given, the former will be adjusted.
Usage
xlimFromYlim(ylim, centerX = 0, x_to_y = 16/9)
Arguments
ylim |
Numeric vector of length 2; the fixed lower and upper boundary of the vertical coordinate range |
centerX |
The horizontal coordinate which the output range is to be centered around (default = 0) |
x_to_y |
The desired ratio of the horizontal (x) to the vertical (y) range. Default is 16/9, a display ratio frequently used for computer or mobile screens |
Details
For certain purposes, e.g. producing a graph that exactly matches a screen,
the x and y coordinates must be adjusted to match a given display ratio. If
the vertical range, ylim
, the desired ratio, x_to_y
and the
desired center of the x-range, centerX
, are provided, this function
returns an adpated vertical range, that can be used as ylim
in any
plot including phasePortrait
.
Value
A numeric vector of length 2; the lower and upper boundary of the resulting vertical coordinate range
See Also
Other helpers:
vector2String()
,
ylimFromXlim()
Examples
# Make a phase portrait of a pretty function that fully covers a
# plot with a display aspect ratio of 5/4.
# 9 inch wide window with 5/4 display ratio (x/y)
# x11(width = 9, height = 9 * 4/5) # Screen device commented out
# due to CRAN test requirements.
# Use it when trying this example
ylim <- c(-8, 7)
xlim <- xlimFromYlim(ylim, centerX = 0, x_to_y = 5/4)
op <- par(mar = c(0, 0, 0, 0), bg = "black") # Omit all plot margins
phasePortrait("exp(cosh(1/(z - 2i + 2)^2 * (1/2i - 1/4 + z)^3))", pType = "pm",
xlim = xlim, ylim = ylim, # Apply the coordinate ranges
xaxs = "i", yaxs = "i", # Allow for now room between plot and axes
nCores = 2) # Max. two cores allowed on CRAN
# not a limit for your own use
par(op)