Connect 4 nodes with lines and color the created area

Question

tsaiwu 2017-1-7

0
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https://ww2.mathworks.cn/matlabcentral/answers/319444-connect-4-nodes-with-lines-and-color-the-created-area

评论： tsaiwu 2017-1-10

I have 2 elements which are based on 4 nodes. How can I connect these nodes to create a rectangle. This rectangle area has a specific value(strain) how can I plot this area with a colorbar, like a typical FEM picuture?

clc; clear all;
%undeformed Node coordinates
N1 = [-1;-1];
N2 = [1;-1];
N3 = [1;1];
N4 = [-1;1];
%deformed Node coordinates
N1d = [2;1];
N2d = [3;1];
N3d = [4;3];
N4d = [1;3];
strainxx = 20;
strainyy = 39;

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Answer 1

Jordan Ross 2017-1-10

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https://ww2.mathworks.cn/matlabcentral/answers/319444-connect-4-nodes-with-lines-and-color-the-created-area#answer_250074

Hello,

As I understand, you are wanting to plot a figure with four nodes and want the area of the polygon to have a different color from a colorbar based on a stress value.

I believe what you are looking for is the "patch" function. Please see the following documentation page which contains an example under the subsection "Different Polygon Face Colors": http://www.mathworks.com/help/matlab/ref/patch.html