MATLAB | 如何用MATLAB如何绘制各式各样精致的三元相图(ternary plot)

整了个大活，写了一个能够生成非常精致三元相图的函数，这种图主要用于展示三种变量之间的比例，本期实验绘制效果如下：

编写不易，这个工具写的脑壳痛，求多多点赞，依旧先介绍咋使用，工具函数放在最后，同时提供gitee及fileexchange下载链接，若是日后代码更改会在这俩仓库同步更改。

教程部分

1 三元相坐标区域创建

就一行代码就可以创建：

% 初始化三元相图(Init ternary plot)
STA1=STernary();

2 set 设置坐标区域最基本属性

set函数可以设置很多坐标区域属性，比如背景颜色Color：

% 背景色变为灰色(Set the background color to gray)
set(STA1,'Color',[.9,.9,.9]);

比如设置ABC三个轴标签A_Label,B_Label,C_Label的文本：

% 设置标签文本(Set Label string)
set(STA1,'A_Label','String','AAAAA')
set(STA1,'B_Label','String','BBBBB')
set(STA1,'C_Label','String','CCCCC')

3 基本绘图

常见的 plot fill scatter contour contourf text 这些绘图函数都可以用，不过需要首字母大写并加个S，继续前面的代码往后写，画个散点图并增添图例：

% 绘制散点图(Draw scatter plot)
A=rand(1,20);
B=rand(1,20);
C=rand(1,20);
STA1.SScatter(A,B,C,40,'filled','CData',[0,0,0]);
legend()

4 set 设置其它属性

ABC各个轴、主刻度、次刻度、主网格、次网格、轴标签、刻度标签全部可以由set函数设置，这里仅举A相关的例子，BC轴就把A字母换换就好：

以下两种设置方式等价：

• set(STA,‘XXX’,‘prop’,…)
• STA.set(‘XXX’,‘prop’,…)

% 设置A轴颜色和粗细(Set A_Axis's 'Color' and 'LineWidth')
set(STA1,'A_Axis','Color',[0,0,.8],'LineWidth',3)
% 设置A轴主网格颜色和粗细(Set A_Grid's 'Color' and 'LineWidth')
set(STA1,'A_Grid','Color',[0,0,.8],'LineWidth',1.2)
% 设置A轴次网格颜色线形
set(STA1,'A_MinorGrid','Color',[0,0,.8],'LineStyle','-.')
% 设置A轴主刻度颜色
set(STA1,'A_Tick','Color',[0,0,.8])
% 设置A轴次刻度颜色
set(STA1,'A_MinorTick','Color',[0,0,.8])
% 设置A轴刻度标签字体和颜色
set(STA1,'A_TickLabel','Color',[0,0,.8],'FontSize',16)
% 设置A轴标签字体和颜色及位置以及文本内容
set(STA1,'A_Label','Color',[0,0,.8],'FontSize',18,'Position',[.88,.6],'String',{'Ternary plot';'by Slandarer'})

5 一些不常设置属性

重新构造一个坐标区域对象叭，不用之前那个灰灰的啦，首先是将标签移动到侧面：

STA2=STernary();

% 将标签移动到侧边(Move the label to the side)
STA2.label2Side();

设置主次刻度长度，设置刻度值/网格值/刻度标签文本：

% 设置刻度长度(Set tick length)
STA2.set('TickLenth',[.035,.02])

% 设置刻度值/网格值/刻度标签
% 'GridValues'/'TickValues'
% 'MinorGridValues'/'MinorTickValues'
% 'A_TickLabelStr'/'B_TickLabelStr'/'C_TickLabelStr'
STA2.set('MinorGridValues',5:5:100)
STA2.set('MinorTickValues',2.5:2.5:100)
STA2.set('A_TickLabelStr',{'20%','40%','60%','80%','100%'})

6 折线图基础绘图及绘图解读

折线图使用SPlot函数绘制:

% 初始化三元相图(Init ternary plot)
STA=STernary();

% 绘制折线图及散点(Draw lines and scatter)
STA.SPlot([2,2],[3,0],[5,8],'LineWidth',4,'Color',[.8,0,0]);
STA.SPlot([2,7],[3,3],[5,0],'LineWidth',4,'Color',[0,.8,0]);
STA.SPlot([2,0],[3,5],[5,5],'LineWidth',4,'Color',[0,0,.8]);
STA.SScatter(2,3,5,180,'filled','CData',[1,1,1],'MarkerEdgeColor',[0,0,0],'LineWidth',2);

% 绘制文本(Draw text)
STA.SText(2+1,3,5,'(20%,30%,50%)','FontSize',16,'FontName','Cambria')

由图所示圆点比例为2:3:5那么平行于A轴网格的线会与A轴交在20%处，相应平行于B轴网格的线与B轴交在30%处。。。。。。同时实际上三条直线的长度也是呈2:3:5的比例的。

7 气泡图绘制

非常简单就几行代码：

% 初始化三元相图(Init ternary plot)
STA=STernary();

% 随机构造数据(Randomly generated data)
A=rand(1,50);
B=rand(1,50);
C=rand(1,50);
sz=rand(1,50);

% 绘制气泡图(Draw bubble chart)
STA.SBubblechart(A,B,C,sz,'CData',A);

想改配色直接colormap即可：

colormap(bone)

8 等高线图与填充等高线图

绘图第四个参数是网格划分点数，若是填[]即为默认值分为90段计算核密度，正常画等高线图会填满整个三角：

% 初始化三元相图(Init ternary plot)
STA=STernary();

% 随机构造数据(Randomly generated data)
A=rand(1,30);
B=rand(1,30);
C=rand(1,30);

STA.SContourf(A,B,C,[],15,'LineWidth',1);

咋低于一定值不画呢，可以获取绘图的高度返回值Z，自定义要画等高线的高度：

% 获取核密度范围并等分(Obtain the range of ksdensity and divide it equally)
[~,Z]=STA.SContourf(A,B,C,[],15,'Visible','off');
levels=linspace(.5,max(max(Z)),15);

% 依据等值线绘制等高线及等高线填充(Draw contour and contourf by levels)
CfHdl=STA.SContourf(A,B,C,[],levels,'LineWidth',1);

多个绘图绘制图例可以直接legend()，但这里我们有一个被隐藏的contourf，建议直接把想要画在图例上的图形句柄放在一个矩阵里：

• legend([A,B,C],{‘A’,‘B’,‘C’})

% 获取核密度范围并等分(Obtain the range of ksdensity and divide it equally)
[~,Z]=STA.SContourf(A,B,C,[],15,'Visible','off');
levels=linspace(.5,max(max(Z)),15);

% 依据等值线绘制等高线及等高线填充(Draw contour and contourf by levels)
CfHdl=STA.SContourf(A,B,C,[],levels,'LineWidth',1);
CHdl=STA.SContour(A,B,C,[],levels,'LineWidth',1,'EdgeColor',[0,0,0]);
SHdl=STA.SScatter(A,B,C,40,'filled','CData',[0,0,0]);

% 绘制图例(Draw legend)
legend([CfHdl,CHdl,SHdl],{'contourf','contour','scatter'},'FontSize',14,'FontName','Cambria')

改个颜色(这就是封面图)：

colormap(turbo)

9 变量范围及凸包

变量应该是非负的，建议自己先处理好数据，当然懒得写函数可以使用该工具自带的归一化工具：

• ABC=STA.SNorm(ABC)

可以将每一列分别映射到0-1，每一列最小值映射到0，最大值映射到1.

• ABC=STA.SNormByLim(ABC,[Amin,Amax,Bmin,Bmax,Cmin,Cmax])

该函数可以预先设置变量范围比如你的数据是0-50范围但是这组数据最大值就是45，那么SNorm函数会把45映射到1，但是SNormByLim函数就能把45映射到0.9。

变量范围映射并绘制散点图

% 初始化三元相图(Init ternary plot)
STA=STernary();

% 随机构造数据(Randomly generated data)
Pnt1=mvnrnd([10,30,10],[15 0 0;0 20 0;0 0 12],80);
Pnt2=mvnrnd([30,10,15],[25 0 0;0 15 0;0 0 40],80);
Pnt3=mvnrnd([25,10,35],[35 0 0;0 20 0;0 0 30],80);

% 数据归一化(Normalization)
Pnt1=STA.SNormByLim(Pnt1,[-5,50,-5,50,-5,50]);
Pnt2=STA.SNormByLim(Pnt2,[-5,50,-5,50,-5,50]);
Pnt3=STA.SNormByLim(Pnt3,[-5,50,-5,50,-5,50]);

% 绘制散点图(Draw scatter)
propCell={80,'filled','LineWidth',1,'MarkerEdgeColor',[1 1 1]*.3,'MarkerFaceColor'};
STA.SScatter(Pnt1(:,1),Pnt1(:,2),Pnt1(:,3),propCell{:},[0.4,0.76,0.65]);
STA.SScatter(Pnt2(:,1),Pnt2(:,2),Pnt2(:,3),propCell{:},[1,0.55,0.38]);
STA.SScatter(Pnt3(:,1),Pnt3(:,2),Pnt3(:,3),propCell{:},[0.55,0.63,0.8]);

凸包绘制本来想让大家用被注释掉的写法，想了想还是算了，注释掉的写法依旧能用，但我将其内置了：

% 已废弃写法(Obsolete method)
% % 计算凸包(Get convhull)
% [X1,Y1]=STA.ternData(Pnt1(:,1),Pnt1(:,2),Pnt1(:,3));
% [X2,Y2]=STA.ternData(Pnt2(:,1),Pnt2(:,2),Pnt2(:,3));
% [X3,Y3]=STA.ternData(Pnt3(:,1),Pnt3(:,2),Pnt3(:,3));
% [ind1,~]=convhull([X1,Y1]);
% [ind2,~]=convhull([X2,Y2]);
% [ind3,~]=convhull([X3,Y3]);
% 
% % 绘制凸包(Draw convhull)
% STA.SFill(Pnt1(ind1,1),Pnt1(ind1,2),Pnt1(ind1,3),[0.4,0.76,0.65],'FaceAlpha',.2,'LineWidth',2,'EdgeColor',[0.4,0.76,0.65]./2);
% STA.SFill(Pnt2(ind2,1),Pnt2(ind2,2),Pnt2(ind2,3),[1,0.55,0.38],'FaceAlpha',.2,'LineWidth',2,'EdgeColor',[1,0.55,0.38]./2);
% STA.SFill(Pnt3(ind3,1),Pnt3(ind3,2),Pnt3(ind3,3),[0.55,0.63,0.8],'FaceAlpha',.2,'LineWidth',2,'EdgeColor',[0.55,0.63,0.8]./2);

% 绘制凸包(Draw convhull)
STA.SConvhull(Pnt1(:,1),Pnt1(:,2),Pnt1(:,3),[0.4,0.76,0.65],'FaceAlpha',.2,'LineWidth',2,'EdgeColor',[0.4,0.76,0.65]./2);
STA.SConvhull(Pnt2(:,1),Pnt2(:,2),Pnt2(:,3),[1,0.55,0.38],'FaceAlpha',.2,'LineWidth',2,'EdgeColor',[1,0.55,0.38]./2);
STA.SConvhull(Pnt3(:,1),Pnt3(:,2),Pnt3(:,3),[0.55,0.63,0.8],'FaceAlpha',.2,'LineWidth',2,'EdgeColor',[0.55,0.63,0.8]./2);

% 绘制图例(Draw legend)
legend({'Data1','Data2','Data3','convex1','convex2','convex3'},'FontSize',14,'FontName','Cambria')

10 利用nan同时绘制多条折线

没错我也考虑了减少循环的一些措施，工具函数支持适当加入nan将折线断开以同时绘制多条折线：

% 初始化三元相图(Init ternary plot)
STA=STernary();


A=rand(1,20);
B=rand(1,20);
C=rand(1,20);

A=[A;A*0+mean(A);A.*nan];
B=[B;B*0+mean(B);B.*nan];
C=[C;C*0+mean(C);C.*nan];
% 绘制折线图(Draw Line)
STA.SScatter(A,B,C,40,'filled','CData',[0,0,0]);

% 绘制散点图(Draw scatter plot)
STA.SPlot(A(:),B(:),C(:),'LineWidth',1,'Color',[0,0,0]);

工具函数完整代码

classdef STernary < handle
% Copyright (c) 2023, Zhaoxu Liu / slandarer
% =========================================================================
% @author : slandarer
% gzh  : slandarer随笔
% -------------------------------------------------------------------------
% Zhaoxu Liu / slandarer (2023). ternary 
% (https://www.mathworks.com/matlabcentral/fileexchange/127958-ternary), 
% MATLAB Central File Exchange. 检索来源 2023/4/18.
    properties
        ax % 三元相图所在坐标区域
        BkgHdl,LabelSep=.001;Color=[1,1,1];
        TriLHdl;TriRHdl
        TickLenth=[.02,.01];
        TickValues=20:20:100;
        GridValues=20:20:100;
        MinorTickValues=5:5:100;
        MinorGridValues=10:10:90;
        A_Axis,B_Axis,C_Axis;
        A_Grid,B_Grid,C_Grid;
        A_Tick,B_Tick,C_Tick;
        A_Label,B_Label;C_Label;
        A_MinorGrid,B_MinorGrid,C_MinorGrid;
        A_MinorTick,B_MinorTick,C_MinorTick;
        A_TickLabel,B_TickLabel,C_TickLabel;
        % A_LabelStr='A-Axis';
        % B_LabelStr='B-Axis';
        % C_LabelStr='C-Axis';
        A_TickLabelStr={'20','40','60','80','100'};
        B_TickLabelStr={'20','40','60','80','100'};
        C_TickLabelStr={'20','40','60','80','100'};
    end
    methods
% Create Ternary Axes =====================================================
        function obj=STernary(ax)
            if nargin<1,ax=gca;end
            obj.ax=ax;
            obj.ax.NextPlot='add';
            obj.ax.XLim=[0-1/40,1+1/40];
            obj.ax.YLim=[0-1/40,sqrt(3)/2+sqrt(3)/80];
            obj.ax.XGrid='off';
            obj.ax.YGrid='off';
            obj.ax.Box='off';
            obj.ax.DataAspectRatio=[1,1,1];
            obj.ax.XColor='none';
            obj.ax.YColor='none';
            % Draw Background >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
            obj.BkgHdl=fill(obj.ax,[0,1,1/2],[0,0,sqrt(3)/2],[1,1,1],'EdgeColor','none');
            obj.TriLHdl=fill(obj.ax,[0,1/2+1/40,0],[0,sqrt(3)/2+1/40*sqrt(3),sqrt(3)/2+1/40*sqrt(3)],[1,1,1],'EdgeColor','none');
            obj.TriRHdl=fill(obj.ax,[1,1/2-1/40,1],[0,sqrt(3)/2+1/40*sqrt(3),sqrt(3)/2+1/40*sqrt(3)],[1,1,1],'EdgeColor','none');
            obj.BkgHdl.Annotation.LegendInformation.IconDisplayStyle='off';
            obj.TriLHdl.Annotation.LegendInformation.IconDisplayStyle='off';
            obj.TriRHdl.Annotation.LegendInformation.IconDisplayStyle='off';
            % Draw Minor Grid >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
            obj.MinorGridValues=setdiff(obj.MinorGridValues,obj.GridValues);
            AMGX=[1-obj.MinorGridValues./200;obj.MinorGridValues./200;obj.MinorGridValues.*nan];
            AMGY=[obj.MinorGridValues./200.*sqrt(3);obj.MinorGridValues./200.*sqrt(3);obj.MinorGridValues.*nan];
            obj.A_MinorGrid=plot(obj.ax,AMGX(:),AMGY(:),'LineWidth',.5,'Color',[0,0,0,.2],'LineStyle','-');
            obj.A_MinorGrid.Annotation.LegendInformation.IconDisplayStyle='off';
            %
            BMGX=[1/2-obj.MinorGridValues./200;1-obj.MinorGridValues./100;obj.MinorGridValues.*nan];
            BMGY=[sqrt(3)/2-obj.MinorGridValues./200.*sqrt(3);obj.MinorGridValues.*0;obj.MinorGridValues.*nan];
            obj.B_MinorGrid=plot(obj.ax,BMGX(:),BMGY(:),'LineWidth',.5,'Color',[0,0,0,.2],'LineStyle','-');
            obj.B_MinorGrid.Annotation.LegendInformation.IconDisplayStyle='off';
            %
            CMGX=[obj.MinorGridValues./100;1/2+obj.MinorGridValues./200;obj.MinorGridValues.*nan];
            CMGY=[obj.MinorGridValues.*0;1/2.*sqrt(3)-obj.MinorGridValues./200.*sqrt(3);obj.MinorGridValues.*nan];
            obj.C_MinorGrid=plot(obj.ax,CMGX(:),CMGY(:),'LineWidth',.5,'Color',[0,0,0,.2],'LineStyle','-');
            obj.C_MinorGrid.Annotation.LegendInformation.IconDisplayStyle='off';
            % Draw Grid >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
            AGX=[1-obj.GridValues./200;obj.GridValues./200;obj.GridValues.*nan];
            AGY=[obj.GridValues./200.*sqrt(3);obj.GridValues./200.*sqrt(3);obj.GridValues.*nan];
            obj.A_Grid=plot(obj.ax,AGX(:),AGY(:),'LineWidth',.8,'Color',[0,0,0,.7],'LineStyle','-');
            obj.A_Grid.Annotation.LegendInformation.IconDisplayStyle='off';
            %
            BGX=[1/2-obj.GridValues./200;1-obj.GridValues./100;obj.GridValues.*nan];
            BGY=[sqrt(3)/2-obj.GridValues./200.*sqrt(3);obj.GridValues.*0;obj.GridValues.*nan];
            obj.B_Grid=plot(obj.ax,BGX(:),BGY(:),'LineWidth',.8,'Color',[0,0,0,.7],'LineStyle','-');
            obj.B_Grid.Annotation.LegendInformation.IconDisplayStyle='off';
            %
            CGX=[obj.GridValues./100;1/2+obj.GridValues./200;obj.GridValues.*nan];
            CGY=[obj.GridValues.*0;1/2.*sqrt(3)-obj.GridValues./200.*sqrt(3);obj.GridValues.*nan];
            obj.C_Grid=plot(obj.ax,CGX(:),CGY(:),'LineWidth',.8,'Color',[0,0,0,.7],'LineStyle','-');
            obj.C_Grid.Annotation.LegendInformation.IconDisplayStyle='off';
            % Draw Minor Tick >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
            obj.MinorTickValues=setdiff(obj.MinorTickValues,obj.TickValues);
            AMTX=[1-obj.MinorTickValues./200;1-obj.MinorTickValues./200+cos(0).*obj.TickLenth(2);obj.MinorTickValues.*nan];
            AMTY=[obj.MinorTickValues./200.*sqrt(3);obj.MinorTickValues./200.*sqrt(3)+sin(0).*obj.TickLenth(2);obj.MinorTickValues.*nan];
            obj.A_MinorTick=plot(obj.ax,AMTX(:),AMTY(:),'LineWidth',.8,'Color',[0,0,0]);
            obj.A_MinorTick.Annotation.LegendInformation.IconDisplayStyle='off';
            %
            BMTX=[1/2-obj.MinorTickValues./200;1/2-obj.MinorTickValues./200+cos(2*pi/3).*obj.TickLenth(2);obj.MinorTickValues.*nan];help STernary
            BMTY=[sqrt(3)/2-obj.MinorTickValues./200.*sqrt(3);sqrt(3)/2-obj.MinorTickValues./200.*sqrt(3)+sin(2*pi/3).*obj.TickLenth(2);obj.MinorTickValues.*nan];
            obj.B_MinorTick=plot(obj.ax,BMTX(:),BMTY(:),'LineWidth',.8,'Color',[0,0,0]);
            obj.B_MinorTick.Annotation.LegendInformation.IconDisplayStyle='off';
            %
            CMTX=[obj.MinorTickValues./100;obj.MinorTickValues./100+cos(-2*pi/3).*obj.TickLenth(2);obj.MinorTickValues.*nan];
            CMTY=[obj.MinorTickValues.*0;obj.MinorTickValues.*0+sin(-2*pi/3).*obj.TickLenth(2);obj.MinorTickValues.*nan];
            obj.C_MinorTick=plot(obj.ax,CMTX(:),CMTY(:),'LineWidth',.8,'Color',[0,0,0]);
            obj.C_MinorTick.Annotation.LegendInformation.IconDisplayStyle='off';
            % Draw Tick >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
            ATX=[1-obj.TickValues./200;1-obj.TickValues./200+cos(0).*obj.TickLenth(1);obj.TickValues.*nan];
            ATY=[obj.TickValues./200.*sqrt(3);obj.TickValues./200.*sqrt(3)+sin(0).*obj.TickLenth(1);obj.TickValues.*nan];
            obj.A_Tick=plot(obj.ax,ATX(:),ATY(:),'LineWidth',1.2,'Color',[0,0,0]);
            obj.A_Tick.Annotation.LegendInformation.IconDisplayStyle='off';
            %
            BTX=[1/2-obj.TickValues./200;1/2-obj.TickValues./200+cos(2*pi/3).*obj.TickLenth(1);obj.TickValues.*nan];
            BTY=[sqrt(3)/2-obj.TickValues./200.*sqrt(3);sqrt(3)/2-obj.TickValues./200.*sqrt(3)+sin(2*pi/3).*obj.TickLenth(1);obj.TickValues.*nan];
            obj.B_Tick=plot(obj.ax,BTX(:),BTY(:),'LineWidth',1.2,'Color',[0,0,0]);
            obj.B_Tick.Annotation.LegendInformation.IconDisplayStyle='off';
            %
            CTX=[obj.TickValues./100;obj.TickValues./100+cos(-2*pi/3).*obj.TickLenth(1);obj.TickValues.*nan];
            CTY=[obj.TickValues.*0;obj.TickValues.*0+sin(-2*pi/3).*obj.TickLenth(1);obj.TickValues.*nan];
            obj.C_Tick=plot(obj.ax,CTX(:),CTY(:),'LineWidth',1.2,'Color',[0,0,0]);
            obj.C_Tick.Annotation.LegendInformation.IconDisplayStyle='off';
            % Draw Axis >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
            obj.A_Axis=plot(obj.ax,[1,1/2],[0,sqrt(3)/2],'Color',[0,0,0],'LineWidth',1.2);
            obj.B_Axis=plot(obj.ax,[1/2,0],[sqrt(3)/2,0],'Color',[0,0,0],'LineWidth',1.2);
            obj.C_Axis=plot(obj.ax,[0,1],[0,0],'Color',[0,0,0],'LineWidth',1.2);
            obj.A_Axis.Annotation.LegendInformation.IconDisplayStyle='off';
            obj.B_Axis.Annotation.LegendInformation.IconDisplayStyle='off';
            obj.C_Axis.Annotation.LegendInformation.IconDisplayStyle='off';
            % Draw Tick Label >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
            for i=1:length(obj.TickValues)
                obj.A_TickLabel{i}=text(obj.ax,...
                    1-obj.TickValues(i)./200+cos(0).*(obj.TickLenth(1)+.01),...
                    obj.TickValues(i)./200.*sqrt(3)+sin(0).*(obj.TickLenth(1)+.01),...
                    obj.A_TickLabelStr{i},'FontName','Cambria','FontSize',12);
                obj.B_TickLabel{i}=text(obj.ax,...
                    1/2-obj.TickValues(i)./200+cos(2*pi/3).*(obj.TickLenth(1)+.01),...
                    sqrt(3)/2-obj.TickValues(i)./200.*sqrt(3)+sin(2*pi/3).*(obj.TickLenth(1)+.01),...
                    obj.B_TickLabelStr{i},'FontName','Cambria','FontSize',12,...
                    'Rotation',-60,'HorizontalAlignment','right');
                obj.C_TickLabel{i}=text(obj.ax,...
                    obj.TickValues(i)./100+cos(-2*pi/3).*(obj.TickLenth(1)+.01),...
                    sin(-2*pi/3).*(obj.TickLenth(1)+.01),...
                    obj.C_TickLabelStr{i},'FontName','Cambria','FontSize',12,...
                    'Rotation',60,'HorizontalAlignment','right');
            end
            % Draw Label >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
            obj.A_Label=text(obj.ax,1/2+cos(pi/2).*obj.LabelSep,sqrt(3)/2+sin(pi/2).*obj.LabelSep,'A-Axis',...
                'FontName','Cambria','FontSize',16,'HorizontalAlignment','center','VerticalAlignment','bottom');
            obj.B_Label=text(obj.ax,cos(-5*pi/6).*obj.LabelSep,sin(-5*pi/6).*obj.LabelSep,'B-Axis',...
                'FontName','Cambria','FontSize',16,'HorizontalAlignment','right','VerticalAlignment','top');
            obj.C_Label=text(obj.ax,1+cos(-pi/6).*obj.LabelSep,sin(-pi/6).*obj.LabelSep,'C-Axis',...
                'FontName','Cambria','FontSize',16,'HorizontalAlignment','left','VerticalAlignment','top');
        end
% Copyright (c) 2023, Zhaoxu Liu / slandarer
% =========================================================================
% @author : slandarer
% gzh  : slandarer随笔
% -------------------------------------------------------------------------
% Zhaoxu Liu / slandarer (2023). ternary 
% (https://www.mathworks.com/matlabcentral/fileexchange/127958-ternary), 
% MATLAB Central File Exchange. 检索来源 2023/4/18.
% Set Ternary Axes ========================================================
        % function setColor(obj,color)
        %     set(obj.BkgHdl,'FaceColor',color);
        % end
% -------------------------------------------------------------------------
        function set(obj,hdlName,varargin)
            if isa(obj.(hdlName),'double')||(length(obj.(hdlName))>1&&(isa(obj.(hdlName){1},'char')||isa(obj.(hdlName){1},'string')))
                switch true
                    case isequal(hdlName,'Color')
                        obj.Color=varargin{:};
                        set(obj.BkgHdl,'FaceColor',varargin{:});
                    case isequal(hdlName,'TickLenth')
                        obj.TickLenth=varargin{:};
                    case isequal(hdlName(end-2:end),'ues')
                        obj.(hdlName)=varargin{:};
                    case isequal(hdlName(end-2:end),'Str')
                        obj.(hdlName)=varargin{:};
                end
                % Renew Minor Grid >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
                obj.MinorGridValues=setdiff(obj.MinorGridValues,obj.GridValues);
                AMGX=[1-obj.MinorGridValues./200;obj.MinorGridValues./200;obj.MinorGridValues.*nan];
                AMGY=[obj.MinorGridValues./200.*sqrt(3);obj.MinorGridValues./200.*sqrt(3);obj.MinorGridValues.*nan];
                set(obj.A_MinorGrid,'XData',AMGX(:),'YData',AMGY(:));
                %
                BMGX=[1/2-obj.MinorGridValues./200;1-obj.MinorGridValues./100;obj.MinorGridValues.*nan];
                BMGY=[sqrt(3)/2-obj.MinorGridValues./200.*sqrt(3);obj.MinorGridValues.*0;obj.MinorGridValues.*nan];
                set(obj.B_MinorGrid,'XData',BMGX(:),'YData',BMGY(:));
                %
                CMGX=[obj.MinorGridValues./100;1/2+obj.MinorGridValues./200;obj.MinorGridValues.*nan];
                CMGY=[obj.MinorGridValues.*0;1/2.*sqrt(3)-obj.MinorGridValues./200.*sqrt(3);obj.MinorGridValues.*nan];
                set(obj.C_MinorGrid,'XData',CMGX(:),'YData',CMGY(:));
                % Renew Grid >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
                AGX=[1-obj.GridValues./200;obj.GridValues./200;obj.GridValues.*nan];
                AGY=[obj.GridValues./200.*sqrt(3);obj.GridValues./200.*sqrt(3);obj.GridValues.*nan];
                set(obj.A_Grid,'XData',AGX(:),'YData',AGY(:));
                %
                BGX=[1/2-obj.GridValues./200;1-obj.GridValues./100;obj.GridValues.*nan];
                BGY=[sqrt(3)/2-obj.GridValues./200.*sqrt(3);obj.GridValues.*0;obj.GridValues.*nan];
                set(obj.B_Grid,'XData',BGX(:),'YData',BGY(:));
                %
                CGX=[obj.GridValues./100;1/2+obj.GridValues./200;obj.GridValues.*nan];
                CGY=[obj.GridValues.*0;1/2.*sqrt(3)-obj.GridValues./200.*sqrt(3);obj.GridValues.*nan];
                set(obj.C_Grid,'XData',CGX(:),'YData',CGY(:));
                % Renew Minor Tick >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
                obj.MinorTickValues=setdiff(obj.MinorTickValues,obj.TickValues);
                AMTX=[1-obj.MinorTickValues./200;1-obj.MinorTickValues./200+cos(0).*obj.TickLenth(2);obj.MinorTickValues.*nan];
                AMTY=[obj.MinorTickValues./200.*sqrt(3);obj.MinorTickValues./200.*sqrt(3)+sin(0).*obj.TickLenth(2);obj.MinorTickValues.*nan];
                set(obj.A_MinorTick,'XData',AMTX(:),'YData',AMTY(:));
                %
                BMTX=[1/2-obj.MinorTickValues./200;1/2-obj.MinorTickValues./200+cos(2*pi/3).*obj.TickLenth(2);obj.MinorTickValues.*nan];
                BMTY=[sqrt(3)/2-obj.MinorTickValues./200.*sqrt(3);sqrt(3)/2-obj.MinorTickValues./200.*sqrt(3)+sin(2*pi/3).*obj.TickLenth(2);obj.MinorTickValues.*nan];
                set(obj.B_MinorTick,'XData',BMTX(:),'YData',BMTY(:));
                %
                CMTX=[obj.MinorTickValues./100;obj.MinorTickValues./100+cos(-2*pi/3).*obj.TickLenth(2);obj.MinorTickValues.*nan];
                CMTY=[obj.MinorTickValues.*0;obj.MinorTickValues.*0+sin(-2*pi/3).*obj.TickLenth(2);obj.MinorTickValues.*nan];
                set(obj.C_MinorTick,'XData',CMTX(:),'YData',CMTY(:));
                % Renew Tick >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
                ATX=[1-obj.TickValues./200;1-obj.TickValues./200+cos(0).*obj.TickLenth(1);obj.TickValues.*nan];
                ATY=[obj.TickValues./200.*sqrt(3);obj.TickValues./200.*sqrt(3)+sin(0).*obj.TickLenth(1);obj.TickValues.*nan];
                set(obj.A_Tick,'XData',ATX(:),'YData',ATY(:));
                %
                BTX=[1/2-obj.TickValues./200;1/2-obj.TickValues./200+cos(2*pi/3).*obj.TickLenth(1);obj.TickValues.*nan];
                BTY=[sqrt(3)/2-obj.TickValues./200.*sqrt(3);sqrt(3)/2-obj.TickValues./200.*sqrt(3)+sin(2*pi/3).*obj.TickLenth(1);obj.TickValues.*nan];
                set(obj.B_Tick,'XData',BTX(:),'YData',BTY(:));
                %
                CTX=[obj.TickValues./100;obj.TickValues./100+cos(-2*pi/3).*obj.TickLenth(1);obj.TickValues.*nan];
                CTY=[obj.TickValues.*0;obj.TickValues.*0+sin(-2*pi/3).*obj.TickLenth(1);obj.TickValues.*nan];
                set(obj.C_Tick,'XData',CTX(:),'YData',CTY(:));
                % Renew Tick Label >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
                for i=1:length(obj.TickValues)
                    set(obj.A_TickLabel{i},'Position',...
                        [1-obj.TickValues(i)./200+cos(0).*(obj.TickLenth(1)+.01),...
                        obj.TickValues(i)./200.*sqrt(3)+sin(0).*(obj.TickLenth(1)+.01)],...
                        'String',obj.A_TickLabelStr{mod(i-1,length(obj.TickValues))+1});
                    set(obj.B_TickLabel{i},'Position',...
                        [1/2-obj.TickValues(i)./200+cos(2*pi/3).*(obj.TickLenth(1)+.01),...
                        sqrt(3)/2-obj.TickValues(i)./200.*sqrt(3)+sin(2*pi/3).*(obj.TickLenth(1)+.01)],...
                        'String',obj.B_TickLabelStr{mod(i-1,length(obj.TickValues))+1});
                    set(obj.C_TickLabel{i},'Position',...
                        [obj.TickValues(i)./100+cos(-2*pi/3).*(obj.TickLenth(1)+.01),...
                        sin(-2*pi/3).*(obj.TickLenth(1)+.01)],...
                        'String',obj.C_TickLabelStr{mod(i-1,length(obj.TickValues))+1});
                end
            else
                if length(obj.(hdlName))>1
                    tHdl=obj.(hdlName);
                    for i=1:length(tHdl)
                        set(tHdl{i},varargin{:})
                    end
                else
                    set(obj.(hdlName),varargin{:})
                end
            end
        end
% -------------------------------------------------------------------------
        function label2Side(obj)
            set(obj.A_Label,'Position',[3/4+cos(pi/6).*obj.LabelSep.*90,sqrt(3)/4+sin(pi/6).*obj.LabelSep.*90],...
                'HorizontalAlignment','center','VerticalAlignment','bottom','Rotation',-60)
            set(obj.B_Label,'Position',[1/4+cos(5*pi/6).*obj.LabelSep.*90,sqrt(3)/4+sin(5*pi/6).*obj.LabelSep.*90],...
                'HorizontalAlignment','center','VerticalAlignment','bottom','Rotation',60)
            set(obj.C_Label,'Position',[1/2+cos(-pi/2).*obj.LabelSep.*90,0+sin(-pi/2).*obj.LabelSep.*90],...
                'HorizontalAlignment','center','VerticalAlignment','top','Rotation',0)
        end
% Copyright (c) 2023, Zhaoxu Liu / slandarer
% =========================================================================
% @author : slandarer
% gzh  : slandarer随笔
% -------------------------------------------------------------------------
% Zhaoxu Liu / slandarer (2023). ternary 
% (https://www.mathworks.com/matlabcentral/fileexchange/127958-ternary), 
% MATLAB Central File Exchange. 检索来源 2023/4/18.
% Define Functions ========================================================
        function scatterHdl=SScatter(obj,A,B,C,varargin)
            [X,Y]=obj.ternData(A,B,C);
            scatterHdl=scatter(obj.ax,X,Y,varargin{:});
        end
% -------------------------------------------------------------------------
        function plotHdl=SPlot(obj,A,B,C,varargin)
            [X,Y]=obj.ternData(A,B,C);
            plotHdl=plot(obj.ax,X,Y,varargin{:});
        end
% -------------------------------------------------------------------------
        function fillHdl=SFill(obj,A,B,C,varargin)
            [X,Y]=obj.ternData(A,B,C);
            fillHdl=fill(obj.ax,X,Y,varargin{:});
        end
% -------------------------------------------------------------------------
        function convhullHdl=SConvhull(obj,A,B,C,varargin)
            [X,Y]=obj.ternData(A,B,C);
            [ind,~]=convhull([X,Y]);
            convhullHdl=fill(obj.ax,X(ind),Y(ind),varargin{:});
        end
% -------------------------------------------------------------------------
        function textHdl=SText(obj,A,B,C,varargin)
            [X,Y]=obj.ternData(A,B,C);
            textHdl=text(obj.ax,X,Y,varargin{:});
        end
% -------------------------------------------------------------------------
        function bubblechartHdl=SBubblechart(obj,A,B,C,varargin)
            [X,Y]=obj.ternData(A,B,C);
            bubblechartHdl=bubblechart(obj.ax,X,Y,varargin{:});
        end
% -------------------------------------------------------------------------
        function [contourHdl,Z]=SContour(obj,A,B,C,N,varargin)
            if isempty(N),N=90;end
            [X,Y]=obj.ternData(A,B,C);
            [XX1,XX2]=meshgrid(linspace(0,1,N),linspace(0,1,N));
            F=ksdensity([X,Y],[XX1(:),XX2(:)]);
            Z=reshape(F,size(XX1));
            Z(XX2>XX1.*sqrt(3)+.03)=nan;
            Z(XX2>sqrt(3)-XX1.*sqrt(3)+.03)=nan;
            hdlSet=findobj(obj.ax,'Tag','TernaryContour');
            if isempty(hdlSet)
                T=1;
            else
                T=1;
                for i=1:length(hdlSet)
                    T=max(T,get(hdlSet(i),'UserData')+1);
                end
            end
            contour(obj.ax,XX1,XX2,Z,varargin{:},'Tag','TernaryContour','UserData',T);
            uistack(obj.TriLHdl,'top');uistack(obj.TriRHdl,'top')
            uistack(obj.A_MinorTick,'top');uistack(obj.B_MinorTick,'top');uistack(obj.C_MinorTick,'top');
            uistack(obj.A_Tick,'top');uistack(obj.B_Tick,'top');uistack(obj.C_Tick,'top');
            uistack(obj.A_Axis,'top');uistack(obj.B_Axis,'top');uistack(obj.C_Axis,'top');
            for i=1:length(obj.A_TickLabel)
                uistack(obj.A_TickLabel{i},'top');
                uistack(obj.B_TickLabel{i},'top');
                uistack(obj.C_TickLabel{i},'top');
            end
            uistack(obj.A_Label,'top');uistack(obj.B_Label,'top');uistack(obj.C_Label,'top');
            contourHdl=findobj(obj.ax,'Tag','TernaryContour','UserData',T);
        end
% -------------------------------------------------------------------------
        function [contourfHdl,Z]=SContourf(obj,A,B,C,N,varargin)
            if isempty(N),N=90;end
            [X,Y]=obj.ternData(A,B,C);
            [XX1,XX2]=meshgrid(linspace(0,1,N),linspace(0,1,N));
            F=ksdensity([X,Y],[XX1(:),XX2(:)]);
            Z=reshape(F,size(XX1));
            Z(XX2>XX1.*sqrt(3)+.03)=nan;
            Z(XX2>sqrt(3)-XX1.*sqrt(3)+.03)=nan;
            hdlSet=findobj(obj.ax,'Tag','TernaryContour');
            if isempty(hdlSet)
                T=1;
            else
                T=1;
                for i=1:length(hdlSet)
                    T=max(T,get(hdlSet(i),'UserData')+1);
                end
            end
            contourf(obj.ax,XX1,XX2,Z,varargin{:},'Tag','TernaryContour','UserData',T);
            uistack(obj.TriLHdl,'top');uistack(obj.TriRHdl,'top')
            uistack(obj.A_MinorTick,'top');uistack(obj.B_MinorTick,'top');uistack(obj.C_MinorTick,'top');
            uistack(obj.A_Tick,'top');uistack(obj.B_Tick,'top');uistack(obj.C_Tick,'top');
            uistack(obj.A_Axis,'top');uistack(obj.B_Axis,'top');uistack(obj.C_Axis,'top');
            for i=1:length(obj.A_TickLabel)
                uistack(obj.A_TickLabel{i},'top');
                uistack(obj.B_TickLabel{i},'top');
                uistack(obj.C_TickLabel{i},'top');
            end   
            uistack(obj.A_Label,'top');uistack(obj.B_Label,'top');uistack(obj.C_Label,'top');
            contourfHdl=findobj(obj.ax,'Tag','TernaryContour','UserData',T);
        end
% -------------------------------------------------------------------------
        function [X,Y]=ternData(~,A,B,C)
            ABC=[A(:),B(:),C(:)];
            ABC=ABC./sum(ABC,2);
            B=ABC(:,2);C=ABC(:,3);
            X=C+(1-C-B)./2;
            Y=0+sqrt(3).*(1-C-B)./2;
        end
% -------------------------------------------------------------------------
        function ABC=SNorm(~,ABC)
            ABC=ABC-min(ABC,[],1);
            ABC=ABC./max(ABC,[],1);
        end
% -------------------------------------------------------------------------
        function ABC=SNormByLim(~,ABC,Lim)
            ABC=ABC-Lim([1,3,5]);
            ABC=ABC./(Lim([2,4,6])-Lim([1,3,5]));
        end
    end
% Copyright (c) 2023, Zhaoxu Liu / slandarer
% =========================================================================
% @author : slandarer
% gzh  : slandarer随笔
% -------------------------------------------------------------------------
% Zhaoxu Liu / slandarer (2023). ternary 
% (https://www.mathworks.com/matlabcentral/fileexchange/127958-ternary), 
% MATLAB Central File Exchange. 检索来源 2023/4/18.
end

完

本代码编写真的不易，光看工具函数也能看出工作量(写推文时mdnice都卡住了)，希望大家该点赞的点赞，该在看的在看！！

未经允许本代码请勿作商业用途，引用的话可以引用我file exchange上的链接，可使用如下格式：

Zhaoxu Liu / slandarer (2023). ternary (https://www.mathworks.com/matlabcentral/fileexchange/127958-ternary), MATLAB Central File Exchange. 检索来源 2023/4/18.

若转载请保留以上file exchange链接及本文链接！！！！!

该工具可通过上述fileexchange链接获取，或者通过以下gitee仓库下载：

https://gitee.com/slandarer/matlab-ternary-plot文章来源地址https://www.toymoban.com/news/detail-427810.html

到了这里，关于MATLAB | 如何用MATLAB如何绘制各式各样精致的三元相图(ternary plot)的文章就介绍完了。如果您还想了解更多内容，请在右上角搜索TOY模板网以前的文章或继续浏览下面的相关文章，希望大家以后多多支持TOY模板网！