graphics (version 3.3)

convertXY: Convert between Graphics Coordinate Systems

Description

Convert between graphics coordinate systems.

Usage

grconvertX(x, from = "user", to = "user")
grconvertY(y, from = "user", to = "user")

Arguments

x, y

numeric vector of coordinates.

from, to

character strings giving the coordinate systems to convert between.

Value

• A numeric vector of the same length as the input.

Details

The coordinate systems are [object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object] (These names can be partially matched.) For the normalized coordinate systems the lower left has value 0 and the top right value 1.

Device coordinates are those in which the device works: they are usually in pixels where that makes sense and in big points (1/72 inch) otherwise (e.g., pdf and postscript).

Examples

op <- par(omd=c(0.1, 0.9, 0.1, 0.9), mfrow = c(1, 2))
plot(1:4)
for(tp in c("in", "dev", "ndc", "nfc", "npc", "nic"))
    print(grconvertX(c(1.0, 4.0), "user", tp))
par(op)

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