This template is suitable for plotting a single group of 1 dimensional items. Refer to the Rmd source code to see how to adapt this template to your project.
Normally you would obtain model parameters from OpenMx (or flexMIRT with flexmirt.read), but here are some inline parameters for demonstration purposes.
small <- structure(list(param = structure(c(1, 1, 0, 0, -0.5789195, -2.412259, -1.3471789, 1, 1, 0, 0, 1.0983234, -2.0991327, -2.9482965, 1, 1, 0, 0, 0.4078264, -0.9824549, -1.5905594, 1, 1, 0, 0, -1.0650001, -0.2100243, -3.2034577), .Dim = c(7L, 4L), .Dimnames = list(NULL, c("X2", "X6", "X7", "X10"))), mean = 0, cov = structure(9.8238066, .Dim = c(1L, 1L))), .Names = c("param", "mean", "cov"))
small$spec <- list()
small$spec[1:4] <- rpf.nrm(outcomes=4, T.c= lower.tri(diag(3),TRUE) * -1)
## Warning in `[<-`(`*tmp*`, 1:4, value = list(<S4 object of class
## structure("rpf.mdim.nrm", package = "rpf")>, : implicit list embedding of
## S4 objects is deprecated
