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.
xlimFromYlim(ylim, centerX = 0, x_to_y = 16/9)
| 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 |
A numeric vector of length 2; the lower and upper boundary of the resulting vertical coordinate range
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.
Other helpers:
vector2String(),
ylimFromXlim()
# 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) # \donttest{ # 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) # }