Hi
I want to draw a line between two points p1 and p2 (no problems) and
then print text it along its path (facing problems). I use grconvertX()
to compute the slope E.g.,
arrows(p1.x, p1.y, p2.x., p2.y); # p2 is on right of p1
vert = grconvertX( c(p2.y, p1.y), from="user", to="inches" ); #
also tried to="device"
horz = grconvertX( c(p2.x, p1.x), from="user", to="inches" );
srt = 180 * atan( diff(vert) / diff(horz) );
text( p2.x, p2.y, "this line", pos=2, srt=srt );
However, the text is never exactly aligned with the line. Usually, it's
a little overtilted. I also tried variously with
par(c("fin","din","pin","plt")) but same kind of luck.
I was wondering if
- Is there a more appropriate way to compute the srt parameter?
- is there some other simple function to to write text at a slope
matching that of some line?
I am using R2.13.1 on a notebook running Windows 7 64bit.
Thanks
din...@milkorwater.com
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