详解Matlab如何绘制圆角半透明图例

第详解Matlab如何绘制圆角半透明图例目录基本使用使用说明完整代码目前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)

holdon

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

functionlegendBox=prettyLegend(ax)

ifnargin1

ax=gca;

holdon

legendTitleColor=[0,0,0];

ifmean(ax.Color)0.5

legendTitleColor=[1,1,1];

ax.Legend.TextColor=[1,1,1];

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=[];

%隐藏原标题

ax.Legend.Title.Visible='off';

%绘制新legend标题

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);

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',[0.390.410.39],'FaceColor',[111.2]);

%ax.Legend.Title.FontSize=14;

%隐藏原标题

ax.Legend.Title.Visible='off';

%绘制新legend标题

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);

%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

functionbt_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))