thermo.plot: Functions to create and modify plots

In CHNOSZ: Thermodynamic Calculations and Diagrams for Geochemistry

Functions to create and modify plots

Description

Initialize a new plot window using preset parameters or add an axis to a plot.

Usage

  thermo.plot.new(xlim, ylim, xlab, ylab, cex = par("cex"),
    mar = NULL, lwd = par("lwd"), side = c(1,2,3,4), 
    mgp = c(1.7, 0.3, 0), cex.axis = par("cex"), col = par("col"),
    yline = NULL, axs = "i", plot.box = TRUE, las = 1,
    xline = NULL, grid = "", col.grid = "gray", ...)
  thermo.axis(lab = NULL, side = 1:4, line = 1.5, cex = par("cex"),
    lwd = par("lwd"), col = par("col"), grid = "", col.grid = "gray",
    plot.line = FALSE)

Arguments

xlim	numeric, limits of the x-axis
ylim	numeric, limits of the y-axis
xlab	character, x-axis label
ylab	character, y-axis label
cex	numeric, character expansion factor for labels
mar	numeric, width (number of lines) of margins on each side of plot
lwd	numeric, line width
side	numeric, which sides of plot to draw axes
mgp	numeric, sizes of margins of plot
cex.axis	numeric, character expansion factor for names of axes
col	character, color
yline	numeric, margin line on which to plot y-axis name
axs	character, setting for axis limit calculation
plot.box	logical, draw a box around the plot?
las	numeric, style for axis labels
xline	numeric, margin line on which to plot x-axis name
grid	character, type of grid (‘⁠major⁠’, ‘⁠minor⁠’, or ‘⁠both⁠’)
col.grid	character, color of the grid lines
...	further arguments passed to par
lab	character, axis label
line	numeric, margin line on which to place axis label
plot.line	logical, draw axis lines?

Details

thermo.plot.new sets parameters for a new plot, creates a new plot using plot.new, and adds the axes tick marks to the plot. Plot parameters (see par) including cex, mar, lwd, mgp and axs can be given, as well as a numeric vector in side identifying which sides of the plot receive tick marks. yline, if present, denotes the margin line (default par('mgp')[1]) where the y-axis name is plotted. thermo.axis is the function that actually adds the axes, including inward-pointing major and minor tick marks (often used for thermodynamic property diagrams).

Use grid to add a grid to the plot, corresponding to either the major ticks (solid lines), minor ticks (dashed lines), or both. The grid can be made by adding grid argument to diagram, or by calling thermo.axis after diagram (see example).

See Also

diagram uses thermo.plot.new to set up a new plot, unless the argument tplot is set to FALSE in diagram.

Examples

# Start a new plot with specific settings
thermo.plot.new(c(0, 10), c(0, 100), xlab = "X variable", ylab = "Y variable")

# Add major and minor tick marks to an existing plot
plot(1:10)
thermo.axis()

CHNOSZ documentation built on Dec. 9, 2025, 3:01 p.m.