我正在嘗試使用 pgfplots 繪製 3 個數字並排繪製。為此，我創建了 3 個帶有 of 的小頁面0.3\textwidth，以便它們之間有一些空間。
然後，在每個小頁中，我繪製以下管子（此處作為 MWE，僅包含一個管）
\documentclass{article}
\usepackage{pgfplots}
\usepackage[showframe]{geometry}
\pgfplotsset{compat=newest}
\begin{document}
\begin{tikzpicture}
\begin{axis}[%
name=plot2,
axis lines=middle, ticks=none,
width=\textwidth,
zmin=0, zmax=6,
xmin=-3, xmax=3,
ymin=-3, ymax=3,
xlabel={$X_1$}, ylabel={$X_2$}, zlabel={$t$},
title={TDSL}
]
\addplot3[%
opacity = 0.02,
fill opacity=0.5,
mesh/interior colormap name=hot,
surf,
colormap/hot,
faceted color=black,
z buffer = sort,
samples = 20,
variable = \u,
variable y = \v,
domain = 0:360,
y domain = 0:5,
]
({cos(u)}, {sin(u)}, {v});
\end{axis}
\end{tikzpicture}
\end{document}
根據它width=\textwidth,應該佔據整個寬度，但事實並非如此。此外，標題「TDSL」位於圖上方非常高的位置，就像有許多空白使實際圖更小一樣。
我的問題是，如何使圖形具有指定的寬度？
答案1
我認為你誤解了@user121799（又名@marmot）。一切都按其應有的方式進行。為了說服您，我添加了軸背景顏色並在第一張圖片中顯示了下面的結果，這是以下程式碼的結果。
當您確定不需要仍然位於軸“框”中的所有四個方向的空間時，您可以調整bounding box繪圖的空間。結果如下第二張圖所示。紅色矩形僅用於調試目的，以顯示調整後的邊界框。有關需要執行哪些操作的詳細信息，請查看程式碼中的註釋。
正如您在第二張圖片中看到的那樣，“僅”調整邊界框不會axis將\textwidth.因此你必須調整該width值手動這樣就真正充分\textwidth利用了。我也在程式碼中對合適的值提出了評論建議。
% used PGFPlots v1.16
\documentclass{article}
\usepackage[showframe]{geometry}
\usepackage{pgfplots}
\pgfplotsset{
% use this `compat` level or higher to position axis labels right
compat=1.8,
% for simplicity created a style of the original `axis` options
my axis style/.style={
width=\textwidth,
axis lines=middle,
ticks=none,
zmin=0, zmax=6,
xmin=-3, xmax=3,
ymin=-3, ymax=3,
xlabel={$X_1$}, ylabel={$X_2$}, zlabel={$t$},
title={TDSL},
% -----------------------------------------------------------------
% (added an axis background color for debugging purposes)
axis background/.style={
fill=blue!25,
opacity=0.5,
},
% -----------------------------------------------------------------
},
% for simplicity created a style for the `\addplot` command
my plot style/.style={
opacity=0.02,
fill opacity=0.5,
mesh/interior colormap name=hot,
surf,
faceted color=black,
z buffer=sort,
samples=20,
variable=\u,
variable y=\v,
domain=0:360,
y domain=0:5,
},
% a style to (almost) achieve what you want
my advanced axis style/.style={
my axis style,
% % because the `width` doesn't know about "correcting" the bounding box
% % you have to manually adjust the value to fit your needs (again)
% width=1.5\textwidth,
title style={
% move title above z-axis (arrow)
at={(axis top)},
% give the title node a name
% (which is later used to determine the bounding box of the plot)
name=axis title,
},
% define some helper coordinates to determine the needed/wanted bounding box
execute at end axis={
\coordinate (axis left) at (axis cs:\pgfkeysvalueof{/pgfplots/xmin},0,0);
\coordinate (axis right) at (axis cs:\pgfkeysvalueof{/pgfplots/xmax},0,0);
\coordinate (axis top) at (axis cs:0,0,\pgfkeysvalueof{/pgfplots/zmax});
%
\coordinate (axis bottom) at (axis cs:0,\pgfkeysvalueof{/pgfplots/ymin},0);
\coordinate (axis lower left) at (axis bottom -| axis left);
% % for the top coordinate we need to account for the title
% % unfortunately at this time the `(axis title)` coordinate is unavailable
% \coordinate (axis upper right) at (axis title.north -| axis right);
},
},
}
\begin{document}
\begin{tikzpicture}
\begin{axis}[my axis style]
\addplot3 [my plot style] ({cos(u)}, {sin(u)}, {v});
\end{axis}
\end{tikzpicture}
\begin{tikzpicture}
% don't calculate a bounding box yet
\begin{pgfinterruptboundingbox}
% use the modified/advanced axis style here
\begin{axis}[my advanced axis style]
\addplot3 [my plot style] ({cos(u)}, {sin(u)}, {v});
\end{axis}
\end{pgfinterruptboundingbox}
% -------------------------------------------------------------------------
% for debugging only
\draw [red] (axis lower left) rectangle (axis title.north -| axis right);
% -------------------------------------------------------------------------
% now we can set the bounding box using the helper coordinates
\useasboundingbox (axis lower left) rectangle (axis title.north -| axis right);
\end{tikzpicture}
\end{document}
第一頁結果：
第二頁結果：
