[R] "non-plot" plotting
Johannes Graumann
johannes_graumann at web.de
Fri Jan 18 09:10:31 CET 2008
Marc, you are kind of crazy ... I asked for a discussion of the path to take
to get there, not to have it done ... but hey, what am I complaining
about? ;0)
Thank you very much!
Joh
Marc Schwartz wrote:
> Johannes Graumann wrote:
>> I really do not know ho to else title this ... I want to draw something
>> like the attached png with R and would like to poll you on how to start
>> ... make an empty plot first and then start positioning the
>> characterstring by 'text' and then drawing the lines ...
>>
>> Joh
>
> Johannes,
>
> Try this (PDF of the output attached):
>
> # Open the initial plot window and set
> # up a coordinate system based upon
> # placement of the letters centered
> # on integer 'x' values 1:12
> plot(1, xlim = c(0, 13), ylim = c(0, 4),
> type = "n",
> ann = FALSE, axes = FALSE)
>
> # Create the vector of letters
> Vec <- c("T", "V", "F", "S", "Q", "A", "Q",
> "L", "C", "A", "L", "K")
>
> # Plot them
> text(1:12, 2, Vec, cex = 2, font = 2)
>
> # Get the height of the letters for spacing
> # See ?strheight
> height <- strheight("T", cex = 2) * .8
>
> # Set a default width for the "boxes"
> # around the letter
> width <- 0.5
>
> # Set the values for 'Y's
> Y <- 10:2
> X <- 3:11
>
> # Loop over the Y's and using plotmath
> # plot the values and subscripts in bold
> # See ?plotmath and ?bquote
> # While looping, do the colored segments
> for (i in 1:9) {
> text(X[i], 2 + (height * 1.6), bquote(bold(Y[.(Y[i])])),
> col = "red", font = 2)
>
> x <- c(X[i] - width, X[i] - width, X[i] + 0.3)
> y <- c(2, 2 + height, 2 + height)
>
> lines(x, y, col = "red", lwd = 2)
> }
>
>
>
>
> # Same here now for the 'b's
>
> b <- c(2:6, 8, 9, 11)
> X <- b
>
> for (i in 1:8) {
> text(X[i], 2 - (height * 1.6), bquote(bold(b[.(b[i])])),
> col = "blue", font = 2)
>
> x <- c(X[i] - 0.3, X[i] + width, X[i] + width)
> y <- c(2 - height, 2 - height, 2)
>
> lines(x, y, col = "blue", lwd = 2)
> }
>
>
>
> The above should provide the basic approach. You can then adjust/fine
> tune spacing, etc. as you require.
>
> HTH,
>
> Marc Schwartz
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