discoleo
commented
2 years ago arrowDoubleInverted
I will send you an improved version of the code.
- added join parameter;
- added dH parameter;
- arrow is always inverted: dH = abs(d);
Arrows.R: Code for arrowDoubleInverted
### Double Lined Inverted Head
# dH = abs(d) ensures always inverted!
#' @export
arrowDoubleInverted = function(x, y, d=-0.25, lwd=1, dH=abs(d), d.head=c(-d, d), d.lines=0,
h.lwd=lwd, col="red", scale=1, join=0) {
if(join > 2) stop("Unsupported value for join!");
slope = compute_slope(x, y);
### Head
arrHead = arrowHeadDoubleInverted(x[2], y[2], slope=slope, d=d, dH=dH, dV=d.head, scale=scale);
midpoint = attr(arrHead, "Mid")
arrHead$lwd = h.lwd;
### ArrowTail
if(join <= 1) {
midpoint = midpoint[[2]];
} else {
midpoint = midpoint[[1]];
}
x[2] = midpoint[1]
y[2] = midpoint[2]
arrow = arrowTail(x, y, d.lines=d.lines, lwd=lwd, slope=slope);
### Full Arrow
lst = list(Arrow=arrow, Head=arrHead);
class(lst) = c("arrow", "list");
# Plot lines:
lines(lst, col=col);
invisible(lst);
}Arrows.Heads.R: Code for arrowHeadDoubleInverted
### Double Lined Inverted ArrowHead: ---<<
# dH = abs(d) ensures always inverted!
#' @export
arrowHeadDoubleInverted = function(x, y, slope, d=-1, dH=abs(d), dV=c(d, -d), scale=1) {
# Shift point along line:
# dH = abs(dV[1]);
# Head: 2nd "<" of "<<"
dHneg = - dH;
pV = shiftPoint(c(x, y), slope=slope, d = dHneg, scale=scale);
arrHead = list(arrowHeadSimple(pV[1], pV[2], slope=slope, d = dH, scale=scale));
midpoint = list(pV);
# Head: 1st "<" of "<<"
pV = shiftPoint(c(x, y), slope=slope, d = d + dHneg);
arrHead2 = list(arrowHeadSimple(pV[1], pV[2], slope=slope, d = dH, scale=scale));
arrHead = c(arrHead, arrHead2);
midpoint = c(list(pV), midpoint);
attr(arrHead, "Mid") = midpoint;
return(arrHead);
}
DarianFlorianVoda
arrowTail: does NOT need the join parameter;arrowSimplearrowXarrowTarrowSquarearrowDoubleInvertedarrowSolidSquare