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corner
2008 Feb 29
2
How to convert the "user coordinate system" in R graph to "normal coordinate system" whose origin is the upper-left cornner of the drawing area?
...,
The user coordiante system in the R graphics is easy to understand as
it simply corresponds to the range of values on the axes of the plot.
However, sometimes, we want to kown the coordinates of a region in other
system, e.g., the normal coordinate system whose origin is the the
upper-left cornner of the drawing area which is used to set the hot regions
in the HTML image maps. Is there any suggestion?
For example, I execute the code,
> png("x.png", width = 480, height = 480,
+ pointsize = 12, bg = "white", res = 100);
> plot(0, xlim=c(0, 100), ylim = c(0...