Move or Draw to a Specified Position

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Description

Grid has the notion of a current location. These functions sets that location.

Usage

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grid.move.to(x = 0, y = 0, default.units = "npc", name = NULL,
             draw = TRUE, vp = NULL)

moveToGrob(x = 0, y = 0, default.units = "npc", name = NULL,
           vp = NULL)

grid.line.to(x = 1, y = 1, default.units = "npc",
             arrow = NULL, name = NULL,
             gp = gpar(), draw = TRUE, vp = NULL)

lineToGrob(x = 1, y = 1, default.units = "npc", arrow = NULL,
           name = NULL, gp = gpar(), vp = NULL)

Arguments

x

A numeric value or a unit object specifying an x-value.

y

A numeric value or a unit object specifying a y-value.

default.units

A string indicating the default units to use if x or y are only given as numeric values.

arrow

A list describing arrow heads to place at either end of the line, as produced by the arrow function.

name

A character identifier.

draw

A logical value indicating whether graphics output should be produced.

gp

An object of class gpar, typically the output from a call to the function gpar. This is basically a list of graphical parameter settings.

vp

A Grid viewport object (or NULL).

Details

Both functions create a move.to/line.to grob (a graphical object describing a move-to/line-to), but only grid.move.to/line.to() draws the move.to/line.to (and then only if draw is TRUE).

Value

A move.to/line.to grob. grid.move.to/line.to() returns the value invisibly.

Author(s)

Paul Murrell

See Also

Grid, viewport, arrow

Examples

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grid.newpage()
grid.move.to(0.5, 0.5)
grid.line.to(1, 1)
grid.line.to(0.5, 0)
pushViewport(viewport(x=0, y=0, w=0.25, h=0.25, just=c("left", "bottom")))
grid.rect()
grid.grill()
grid.line.to(0.5, 0.5)
popViewport()

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