This simple function is useful for adjusting x and y coordinate ranges
xlim and ylim in order to maintain a desired display ratio. The
former must be given, the latter will be adjusted.
ylimFromXlim(xlim, centerY = 0, x_to_y = 16/9)
| xlim | Numeric vector of length 2; the fixed lower and upper boundary of the horizontal coordinate range |
|---|---|
| centerY | The vertical 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 horizontal range, xlim, the desired ratio, x_to_y and the
desired center of the y-range, centerY are provided, this function
returns an adapted vertical range, that can be used as ylim in any
plot including phasePortrait.
Other helpers:
vector2String(),
xlimFromYlim()
# Make a phase portrait of a Jacobi theta function that fully covers a # plot with a display aspect ratio of 4/3. # 10 inch wide window with 4/3 display ratio (x/y) # \donttest{ # x11(width = 10, height = 10 * 3/4) # Screen device commented out # due to CRAN test requirements. # Use it when trying this example xlim <- c(-3, 3) ylim <- ylimFromXlim(xlim, centerY = -0.3, x_to_y = 4/3) op <- par(mar = c(0, 0, 0, 0), bg = "black") # Omit all plot margins phasePortrait(jacobiTheta, moreArgs = list(tau = 1i/2 - 1/3), xlim = xlim, ylim = ylim, # Apply the coordinate ranges xaxs = "i", yaxs = "i", # Allow for now room between plot and axes nCores = 1) # Max. two cores allowed on CRAN # not a limit for your own use par(op) # }