| convertXY {graphics} | R Documentation |
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. |
Details
The coordinate systems are
"user"user coordinates.
"inches"inches.
"device"the device coordinate system.
"ndc"normalized device coordinates.
"nfc"normalized figure coordinates.
"npc"normalized plot coordinates.
"nic"normalized inner region coordinates. (The ‘inner region’ is that inside the outer margins.)
"lines"lines of margin (based on
mex)."chars"lines of text (based on
cex).
(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).
Value
A numeric vector of the same length as the input.
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", "lines", "chars"))
print(grconvertX(c(1.0, 4.0), "user", tp))
par(op)