A way to rotate plot in R

A way to rotate plot in R

Rotate a plot (with below rotation setting) seems to be impossible in R
according to Google.
So I am looking for a way to do that, but still no success till now.
Rotation setting :
The rotation center is the origin of plot ({0,0})
The given angle will be the angle between the y axis and the plot.
Here is a code where
a is something depending on angle and x axis length. (I think)
b is something depending on angle and y axis length. (I think)
:
speed <- cars$speed
dist <- cars$dist
plot(speed,dist, xlim=c(0,121), ylim=c(0,121))
xTemp <- speed
speed <- speed + (a)
dist <- dist + (b)
par(new=TRUE)
plot(speed,dist, xlim=c(0,121), ylim=c(0,121), col="red")
Any idea of a and b values ?
Here is for example a code in wich the plot is rotated by about 50 degrees
from the y axis (Notice that is is not a true rotation. speed value is
extended after rotation.. I don't now how to fix it.) :
speed <- cars$speed
dist <- cars$dist
plot(speed,dist, xlim=c(0,121), ylim=c(0,121))
xTemp <- speed
speed <- speed + dist
dist <- dist - xTemp
par(new=TRUE)
plot(speed,dist, xlim=c(0,121), ylim=c(0,121), col="red")