目前MATLAB的legend图例是不支持圆角和半透明的，欸，不能咱就自己画，就是把原始图例隐藏后不断追踪其位置绘制半透明的圆角矩形嘛，这有任何难度吗？？？完全没有！！因此就有了这篇推送(目前不支持三维绘图)：
基本使用
继续假设我们编写了如下代码：
t=0:0.35:3*pi;
plot(t,sin(t),'Marker','d','LineWidth',2,'Color',[102,194,166]./255)
hold on
plot(t,cos(t./2),'Marker','o','LineWidth',2,'Color',[252,140,97]./255)
plot(t,t,'Marker','^','LineWidth',2,'Color',[140,161,204]./255)
lgd=legend('y=sin(t)','y=cos(t/2)','y=t');
lgd.Location='northwest';
lgd.FontSize=13;
title(lgd,'Func','FontSize',14)绘图结果如下：
在代码最后加上一行：
prettyLegend()
不过这样只体现了圆角的性质，并没有体现其半透明，要体现其半透明的性质坐标区域最好不是白色的，哎我们直接和上一篇一结合不就好了(Matlab绘制酷炫坐标区域的方法详解)
例如最后加上两行(注意请将图例修饰加在坐标区域修饰后面)：
prettyAxes().dark2()
prettyLegend()
prettyAxes().dark()
prettyLegend()
使用说明
当拖拽图例到其他位置，图例框会跟随：
当调整图窗大小导致图例框大小异常时，在图例附近晃动鼠标即可修复大小：
完整代码
function legendBox=prettyLegend(ax)
if nargin<1
ax=gca;
end
hold on
legendTitleColor=[0,0,0];
if mean(ax.Color)<0.5
legendTitleColor=[1,1,1];
ax.Legend.TextColor=[1,1,1];
end
ax.Legend.AutoUpdate='on';
% ax.Legend.FontSize=11;
% ax.Legend.Title.FontSize=14;
ax.Legend.AutoUpdate='off';
% 如果在图窗外则不设框
if ~isempty(regexpi(ax.Legend.Location,'out', 'once'))
ax.Legend.Box='off';
lgdPos=ax.Legend.Position;
% 依据legend所处figure坐标和axes范围计算Legend坐标
xyMin=[(lgdPos(1)-ax.Position(1))/ax.Position(3)*(ax.XLim(2)-ax.XLim(1))+ax.XLim(1),...
(lgdPos(2)-ax.Position(2))/ax.Position(4)*(ax.YLim(2)-ax.YLim(1))+ax.YLim(1)];
xyMax=[(lgdPos(1)+lgdPos(3)-ax.Position(1))/ax.Position(3)*(ax.XLim(2)-ax.XLim(1))+ax.XLim(1),...
(lgdPos(2)+lgdPos(4)-ax.Position(2))/ax.Position(4)*(ax.YLim(2)-ax.YLim(1))+ax.YLim(1)];
ax.Legend.UserData.NewBkg=[];
% 隐藏原
ax.Legend.Title.Visible='off';
% 绘制新legend
ax.Legend.UserData.NewTitle=text(ax,xyMin(1),xyMax(2),[' ',ax.Legend.Title.String],...
'FontSize',ax.Legend.Title.FontSize,'VerticalAlignment','top','FontWeight','bold','Color',legendTitleColor);
else
ax.Legend.Box='off';
lgdPos=ax.Legend.Position;
% 依据legend所处figure坐标和axes范围计算Legend坐标
xyMin=[(lgdPos(1)-ax.Position(1))/ax.Position(3)*(ax.XLim(2)-ax.XLim(1))+ax.XLim(1),...
(lgdPos(2)-ax.Position(2))/ax.Position(4)*(ax.YLim(2)-ax.YLim(1))+ax.YLim(1)];
xyMax=[(lgdPos(1)+lgdPos(3)-ax.Position(1))/ax.Position(3)*(ax.XLim(2)-ax.XLim(1))+ax.XLim(1),...
(lgdPos(2)+lgdPos(4)-ax.Position(2))/ax.Position(4)*(ax.YLim(2)-ax.YLim(1))+ax.YLim(1)];
xDiff=(xyMax(1)-xyMin(1));
yDiff=(xyMax(2)-xyMin(2));
% 绘制圆角矩形作为新框
ax.Legend.UserData.NewBkg=rectangle(ax,'Position',[xyMin,xDiff,yDiff],'Curvature',0.2,...
'LineWidth',1.2,'EdgeColor',[0.39 0.41 0.39],'FaceColor',[1 1 1 .2]);
%ax.Legend.Title.FontSize=14;
% 隐藏原
ax.Legend.Title.Visible='off';
% 绘制新legend
ax.Legend.UserData.NewTitle=text(ax,xyMin(1),xyMax(2),[' ',ax.Legend.Title.String],...
'FontSize',ax.Legend.Title.FontSize,'VerticalAlignment','top','FontWeight','bold','Color',legendTitleColor);
end
% 返回值
legendBox.Title=ax.Legend.UserData.NewTitle;
legendBox.Box=ax.Legend.UserData.NewBkg;
oriFunc=ax.Parent.WindowButtonMotionFcn;
set(ax.Parent,'WindowButtonMotionFcn',@bt_move);% 设置鼠标移动回调
function bt_move(~,~)
oriFunc();
if ~isempty(regexpi(ax.Legend.Location,'out', 'once'))
lgdPos=ax.Legend.Position;
% 依据legend所处figure坐标和axes范围计算Legend坐标
xyMin=[(lgdPos(1)-ax.Position(1))/ax.Position(3)*(ax.XLim(2)-ax.XLim(1))+ax.XLim(1),...
(lgdPos(2)-ax.Position(2))/ax.Position(4)*(ax.YLim(2)-ax.YLim(1))+ax.YLim(1)];
xyMax=[(lgdPos(1)+lgdPos(3)-ax.Position(1))/ax.Position(3)*(ax.XLim(2)-ax.XLim(1))+ax.XLim(1),...
(lgdPos(2)+lgdPos(4)-ax.Position(2))/ax.Position(4)*(ax.YLim(2)-ax.YLim(1))+ax.YLim(1)];
xyMin(1)=max(xyMin(1),ax.XLim(1));
xyMin(2)=max(xyMin(2),ax.YLim(1));
xyMax(1)=min(xyMax(1),ax.XLim(2));
xyMax(2)=min(xyMax(2),ax.YLim(2));
% 重设位置属性
ax.Legend.UserData.NewTitle.Position=[xyMin(1),xyMax(2)];
else
lgdPos=ax.Legend.Position;
% 依据legend所处figure坐标和axes范围计算Legend坐标
xyMin=[(lgdPos(1)-ax.Position(1))/ax.Position(3)*(ax.XLim(2)-ax.XLim(1))+ax.XLim(1),...
(lgdPos(2)-ax.Position(2))/ax.Position(4)*(ax.YLim(2)-ax.YLim(1))+ax.YLim(1)];
xyMax=[(lgdPos(1)+lgdPos(3)-ax.Position(1))/ax.Position(3)*(ax.XLim(2)-ax.XLim(1))+ax.XLim(1),...
(lgdPos(2)+lgdPos(4)-ax.Position(2))/ax.Position(4)*(ax.YLim(2)-ax.YLim(1))+ax.YLim(1)];
xyMin(1)=max(xyMin(1),ax.XLim(1));
xyMin(2)=max(xyMin(2),ax.YLim(1));
xyMax(1)=min(xyMax(1),ax.XLim(2));
xyMax(2)=min(xyMax(2),ax.YLim(2));
xDiff=(xyMax(1)-xyMin(1));
yDiff=(xyMax(2)-xyMin(2));
% 重设位置属性
ax.Legend.UserData.NewBkg.Position=[xyMin,xDiff,yDiff];
ax.Legend.UserData.NewTitle.Position=[xyMin(1),xyMax(2)];
end
end
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