Plotting pie charts over GraphPlot

Question

Woda 2021-10-19

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1566983-plotting-pie-charts-over-graphplot

回答： Woda 2021-10-21

Hi,

I want to plot pie-charts over the nodes of a graph plotted as a GraphPlot object such that the middle of the pie sits exactly at the node.

Hence, I want to do something like this

s = [1 1 1 1 2 2 3 4 4 5 6];
t = [2 3 4 5 3 6 6 5 7 7 7];
G = graph(s,t); 
p = plot(G);

and then add an axes and plot a pie chart over one of the nodes with

axes('Position',[?, ?, pie_size, pie_size]);
X = [1  0.5 2.5 2]; pie_chart = pie(X, repmat({''},size(X)));

The ? represent the coordinates of the new plot inside the graph plot.

While I can read out the coordinates of the nodes in the graph plot from p.XData and p.YData, these seem to be relative to the center of the plot in units which are incompatible to any available unit system in the axes function.

Does anyone know of a way to accomplish what I want (possibly also in a different way)?

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Chunru 2021-10-19

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1566983-plotting-pie-charts-over-graphplot#answer_811873

编辑：Chunru 2021-10-21

在 MATLAB Online 中打开

Here is the updated answer. We play with the properties of pie_chart this time.

clf

s = [1 1 1 1 2 2 3 4 4 5 6];

t = [2 3 4 5 3 6 6 5 7 7 7];

ax=axes;

G = graph(s,t);

p = plot(G);

hold on

X = [1 0.5 2.5 2];

pie_chart = pie(ax, X, repmat({''},size(X)));

% Align the pie_chart

idx = find(p.NodeLabel == "1");

xn=p.XData(idx);

yn=p.YData(idx);

scale = 0.2;

for k = 1:length(pie_chart)

if pie_chart(k).Type=="patch"

XData = pie_chart(k).XData;

YData = pie_chart(k).YData;

set(pie_chart(k),'XData', XData*scale + xn);

set(pie_chart(k),'YData', YData*scale + yn);

set(pie_chart(k),'FaceAlpha', 0.5);

else % Text labels

Pos = pie_chart(k).Position;

pie_chart(k).Position = Pos*scale + [xn yn 0];

end

axis equal

% clf

% % Pie chart

% ax(1)=axes;

% X = [1 0.5 2.5 2]; pie_chart = pie(X, repmat({''},size(X)));

% set(findobj(pie_chart, 'Type', 'Patch'), 'FaceAlpha', 0.8)

%

% % Graph

% ax(2)=axes;

% ax(2).Position = ax(1).Position;

%

% s = [1 1 1 1 2 2 3 4 4 5 6];

% t = [2 3 4 5 3 6 6 5 7 7 7];

%

% G = graph(s,t);

% p = plot(G);

% ax(2).Color='none';

%

% % Align the graph

% idx = find(p.NodeLabel == "1");

% xn=p.XData(idx);

% yn=p.YData(idx);

%

% % scale the graph by 0.5 (adjust this number)

% p.XData = (p.XData-xn)*.5;

% p.YData = (p.YData-yn)*.5;

%

% ax(2).XLim = ax(1).XLim;

% ax(2).YLim = ax(1).YLim;

% s = [1 1 1 1 2 2 3 4 4 5 6];

% t = [2 3 4 5 3 6 6 5 7 7 7];

% ax(1) = axes;

% G = graph(s,t);

% p = plot(G);

% ax(2)=axes;

%

% ax(2).Color='none'

% X = [1 0.5 2.5 2]; pie_chart = pie(X, repmat({''},size(X)));

% set(findobj(pie_chart, 'Type', 'Patch'), 'FaceAlpha', 0.3)

4 个评论
显示 2更早的评论隐藏 2更早的评论

Woda 2021-10-21

Thank you for your answer. However, I am afraid that still does not solve my problem. At least I cannot see how to adapt your code so that it does.

The problem is that I want to have a small pie chart plotted over every (!) node of the lattice, much like this

only with one chart per node.

In your solution, you move one node of the graph to the center of the plot to align the pie chart with the node. This, however, works only for one node! When trying to instead move the pie-chart to a non-zero location to coincide with the node, I faced the same problem as in my first answer (the coordindates do not seem to measured in the same units).