底部R中的图例：可以填充某些线条上的图形框吗？可以填充覆盖整个符号的绘图框吗？

我有一个重叠阴影置信区间的图，如下所示：

我非常想用置信区间的颜色来诠释这个传说。比如：

除了，我想要两样东西：

对于前两个条目上不显示的框

使方框在最后三个条目上的点和行的最右侧延伸 （我使用base R而不是ggplot2的原因与此应用程序无关。）

下面是复制图例的代码示例：

#Build a fake plot so that legend has somewhere to sit
xx <- seq(0,10,by=.1)
yy <- 2*xx + rnorm(length(xx),0,1)
plot(xx,yy)

#Build the legend
estNames <- c('est1','est2','est3')
legend('bottomright', 
        c("no box, no point","no box, no point",estNames) , 
        lty=c(rep('dotted',2),rep('solid',3)), 
        col=c('black','red',1,2,4),
        pch=c(-1,-1,rep(16,3)),
        lwd=1,
        fill=c( 0, 0,
            rep( c( rgb(0.5,0.5,0.1,0.25),
                rgb(0.5,0.1,0.1,0.25),
                rgb(0.1,0.1,0.5,0.25)), 2)),
        inset=0,bg='white') 

#建立一个虚假的情节，这样传奇就有了一席之地
xx丑陋的临时解决方案，但似乎有效


要删除符号周围的边框，请使用
border
参数。根据您的背景调整颜色

legend.v2('bottomright', 
        c("no box, no point","no box, no point",estNames) , 
        lty=c(rep('dotted',2),rep('solid',3)), 
        col=c('black','red',1,2,4),
        pch=c(-1,-1,rep(16,3)),
        lwd=1,
        border = c("white", "white", "black", "black", "black"),
        trace = TRUE,
        fill=c( 0, 0,
                rep( c( rgb(0.5,0.5,0.1,0.25),
                                rgb(0.5,0.1,0.1,0.25),
                                rgb(0.1,0.1,0.5,0.25)), 2)),
        inset=0,bg='white')

围绕符号绘制矩形的函数是
？rect
。
我将
xbox
参数乘以3（向下滚动到
if（mfill）
行）。实验表明，正确的乘法因子可能要小一点

legend.v2 <- function (x, y = NULL, legend, fill = NULL, col = par("col"), 
        border = "black", lty, lwd, pch, angle = 45, density = NULL, 
        bty = "o", bg = par("bg"), box.lwd = par("lwd"), box.lty = par("lty"), 
        box.col = par("fg"), pt.bg = NA, cex = 1, pt.cex = cex, pt.lwd = lwd, 
        xjust = 0, yjust = 1, x.intersp = 1, y.intersp = 1, adj = c(0, 
                0.5), text.width = NULL, text.col = par("col"), merge = do.lines && 
                has.pch, trace = FALSE, plot = TRUE, ncol = 1, horiz = FALSE, 
        title = NULL, inset = 0, xpd, title.col = text.col, title.adj = 0.5, 
        seg.len = 2) 
{
    if (missing(legend) && !missing(y) && (is.character(y) || 
                is.expression(y))) {
        legend <- y
        y <- NULL
    }
    mfill <- !missing(fill) || !missing(density)
    if (!missing(xpd)) {
        op <- par("xpd")
        on.exit(par(xpd = op))
        par(xpd = xpd)
    }
    title <- as.graphicsAnnot(title)
    if (length(title) > 1) 
        stop("invalid title")
    legend <- as.graphicsAnnot(legend)
    n.leg <- if (is.call(legend)) 
                1
            else length(legend)
    if (n.leg == 0) 
        stop("'legend' is of length 0")
    auto <- if (is.character(x)) 
                match.arg(x, c("bottomright", "bottom", "bottomleft", 
                                "left", "topleft", "top", "topright", "right", "center"))
            else NA
    if (is.na(auto)) {
        xy <- xy.coords(x, y)
        x <- xy$x
        y <- xy$y
        nx <- length(x)
        if (nx < 1 || nx > 2) 
            stop("invalid coordinate lengths")
    }
    else nx <- 0
    xlog <- par("xlog")
    ylog <- par("ylog")
    rect2 <- function(left, top, dx, dy, density = NULL, angle, 
            ...) {
        r <- left + dx
        if (xlog) {
            left <- 10^left
            r <- 10^r
        }
        b <- top - dy
        if (ylog) {
            top <- 10^top
            b <- 10^b
        }
        rect(left, top, r, b, angle = angle, density = density, 
                ...)
    }
    segments2 <- function(x1, y1, dx, dy, ...) {
        x2 <- x1 + dx
        if (xlog) {
            x1 <- 10^x1
            x2 <- 10^x2
        }
        y2 <- y1 + dy
        if (ylog) {
            y1 <- 10^y1
            y2 <- 10^y2
        }
        segments(x1, y1, x2, y2, ...)
    }
    points2 <- function(x, y, ...) {
        if (xlog) 
            x <- 10^x
        if (ylog) 
            y <- 10^y
        points(x, y, ...)
    }
    text2 <- function(x, y, ...) {
        if (xlog) 
            x <- 10^x
        if (ylog) 
            y <- 10^y
        text(x, y, ...)
    }
    if (trace) 
        catn <- function(...) do.call("cat", c(lapply(list(...), 
                                    formatC), list("\n")))
    cin <- par("cin")
    Cex <- cex * par("cex")
    if (is.null(text.width)) 
        text.width <- max(abs(strwidth(legend, units = "user", 
                                cex = cex)))
    else if (!is.numeric(text.width) || text.width < 0) 
        stop("'text.width' must be numeric, >= 0")
    xc <- Cex * xinch(cin[1L], warn.log = FALSE)
    yc <- Cex * yinch(cin[2L], warn.log = FALSE)
    if (xc < 0) 
        text.width <- -text.width
    xchar <- xc
    xextra <- 0
    yextra <- yc * (y.intersp - 1)
    ymax <- yc * max(1, strheight(legend, units = "user", cex = cex)/yc)
    ychar <- yextra + ymax
    if (trace) 
        catn("  xchar=", xchar, "; (yextra,ychar)=", c(yextra, 
                        ychar))
    if (mfill) {
        xbox <- xc * 0.8
        ybox <- yc * 0.5
        dx.fill <- xbox
    }
    do.lines <- (!missing(lty) && (is.character(lty) || any(lty > 
                                    0))) || !missing(lwd)
    n.legpercol <- if (horiz) {
                if (ncol != 1) 
                    warning("horizontal specification overrides: Number of columns := ", 
                            n.leg)
                ncol <- n.leg
                1
            }
            else ceiling(n.leg/ncol)
    has.pch <- !missing(pch) && length(pch) > 0
    if (do.lines) {
        x.off <- if (merge) 
                    -0.7
                else 0
    }
    else if (merge) 
        warning("'merge = TRUE' has no effect when no line segments are drawn")
    if (has.pch) {
        if (is.character(pch) && !is.na(pch[1L]) && nchar(pch[1L], 
                type = "c") > 1) {
            if (length(pch) > 1) 
                warning("not using pch[2..] since pch[1L] has multiple chars")
            np <- nchar(pch[1L], type = "c")
            pch <- substr(rep.int(pch[1L], np), 1L:np, 1L:np)
        }
    }
    if (is.na(auto)) {
        if (xlog) 
            x <- log10(x)
        if (ylog) 
            y <- log10(y)
    }
    if (nx == 2) {
        x <- sort(x)
        y <- sort(y)
        left <- x[1L]
        top <- y[2L]
        w <- diff(x)
        h <- diff(y)
        w0 <- w/ncol
        x <- mean(x)
        y <- mean(y)
        if (missing(xjust)) 
            xjust <- 0.5
        if (missing(yjust)) 
            yjust <- 0.5
    }
    else {
        h <- (n.legpercol + (!is.null(title))) * ychar + yc
        w0 <- text.width + (x.intersp + 1) * xchar
        if (mfill) 
            w0 <- w0 + dx.fill
        if (do.lines) 
            w0 <- w0 + (seg.len + +x.off) * xchar
        w <- ncol * w0 + 0.5 * xchar
        if (!is.null(title) && (abs(tw <- strwidth(title, units = "user", 
                                    cex = cex) + 0.5 * xchar)) > abs(w)) {
            xextra <- (tw - w)/2
            w <- tw
        }
        if (is.na(auto)) {
            left <- x - xjust * w
            top <- y + (1 - yjust) * h
        }
        else {
            usr <- par("usr")
            inset <- rep(inset, length.out = 2)
            insetx <- inset[1L] * (usr[2L] - usr[1L])
            left <- switch(auto, bottomright = , topright = , 
                    right = usr[2L] - w - insetx, bottomleft = , 
                    left = , topleft = usr[1L] + insetx, bottom = , 
                    top = , center = (usr[1L] + usr[2L] - w)/2)
            insety <- inset[2L] * (usr[4L] - usr[3L])
            top <- switch(auto, bottomright = , bottom = , bottomleft = usr[3L] + 
                            h + insety, topleft = , top = , topright = usr[4L] - 
                            insety, left = , right = , center = (usr[3L] + 
                                usr[4L] + h)/2)
        }
    }
    if (plot && bty != "n") {
        if (trace) 
            catn("  rect2(", left, ",", top, ", w=", w, ", h=", 
                    h, ", ...)", sep = "")
        rect2(left, top, dx = w, dy = h, col = bg, density = NULL, 
                lwd = box.lwd, lty = box.lty, border = box.col)
    }
    xt <- left + xchar + xextra + (w0 * rep.int(0:(ncol - 1), 
                rep.int(n.legpercol, ncol)))[1L:n.leg]
    yt <- top - 0.5 * yextra - ymax - (rep.int(1L:n.legpercol, 
                        ncol)[1L:n.leg] - 1 + (!is.null(title))) * ychar
    if (mfill) {
        if (plot) {
            fill <- rep(fill, length.out = n.leg)
            rect2(left = xt, top = yt + ybox/2, dx = xbox * 3, dy = ybox, 
                    col = fill, density = density, angle = angle, 
                    border = border)
        }
        xt <- xt + dx.fill
    }
    if (plot && (has.pch || do.lines)) 
        col <- rep(col, length.out = n.leg)
    if (missing(lwd)) 
        lwd <- par("lwd")
    if (do.lines) {
        if (missing(lty)) 
            lty <- 1
        lty <- rep(lty, length.out = n.leg)
        lwd <- rep(lwd, length.out = n.leg)
        ok.l <- !is.na(lty) & (is.character(lty) | lty > 0)
        if (trace) 
            catn("  segments2(", xt[ok.l] + x.off * xchar, ",", 
                    yt[ok.l], ", dx=", seg.len * xchar, ", dy=0, ...)")
        if (plot) 
            segments2(xt[ok.l] + x.off * xchar, yt[ok.l], dx = seg.len * 
                            xchar, dy = 0, lty = lty[ok.l], lwd = lwd[ok.l], 
                    col = col[ok.l])
        xt <- xt + (seg.len + x.off) * xchar
    }
    if (has.pch) {
        pch <- rep(pch, length.out = n.leg)
        pt.bg <- rep(pt.bg, length.out = n.leg)
        pt.cex <- rep(pt.cex, length.out = n.leg)
        pt.lwd <- rep(pt.lwd, length.out = n.leg)
        ok <- !is.na(pch) & (is.character(pch) | pch >= 0)
        x1 <- (if (merge && do.lines) 
                xt - (seg.len/2) * xchar
            else xt)[ok]
        y1 <- yt[ok]
        if (trace) 
            catn("  points2(", x1, ",", y1, ", pch=", pch[ok], 
                    ", ...)")
        if (plot) 
            points2(x1, y1, pch = pch[ok], col = col[ok], cex = pt.cex[ok], 
                    bg = pt.bg[ok], lwd = pt.lwd[ok])
    }
    xt <- xt + x.intersp * xchar
    if (plot) {
        if (!is.null(title)) 
            text2(left + w * title.adj, top - ymax, labels = title, 
                    adj = c(title.adj, 0), cex = cex, col = title.col)
        text2(xt, yt, labels = legend, adj = adj, cex = cex, 
                col = text.col)
    }
    invisible(list(rect = list(w = w, h = h, left = left, top = top), 
                    text = list(x = xt, y = yt)))
}

legend.v2我从来没有想过要深入挖掘源代码。我想这就是R的一部分美；你甚至可以处理一些看起来像“命令”的事情。因此，如果我了解解决方案，您可以在控制台中键入
legend
，以获取R使用的代码。然后您找到了代码中绘制矩形的部分，并对其进行了适当的修改。这太棒了，谢谢你！（感谢您为我指出了
边框的正确方向）
！）我就是这样做的。有时你看不到代码，你必须下载源代码。如果幸运的话，源文件有很好的文档记录，可以帮助您指导整个过程。我创建了一个新函数以避免与原始函数重叠（我甚至将其存储到一个新文件中，因为我就是这样工作的）。