MATLAB Answers

fill a polygon with a hole

조회 수: 15(최근 30일)
Qingping
Qingping 2014년 2월 26일
답변: Steven Lord 2019년 9월 19일
data=[
0.5, 0.8;
1.0, 0.0;
0.0, 0.0;
0.5, 0.8;
0.5, 0.4;
0.1, 0.1;
0.7, 0.1;
0.5, 0.4;
];
h=fill(data(:,1),data(:,2),'r')
the image is:
there is a line between dot(0.5,0.8) and (0.5,0.4) how to delete this line in prefectly? such as
I used the code set(h,'EdgeColor','r') to disappear this line.
  댓글 수: 2
Qingping
Qingping 2014년 2월 28일
I want to delete the line between two triangle in automatic!

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채택된 답변

lvn
lvn 2014년 2월 28일
Alternatively, you can remove all black lines (like that the figure looks good to me)
h=fill(data(:,1),data(:,2),'r','Linestyle','none')

추가 답변(2개)

Image Analyst
Image Analyst 2014년 2월 26일
Simply get rid of the last 5 rows of your data.
data=[
0.5, 0.8;
1.0, 0.0;
0.0, 0.0;
];
h=fill(data(:,1),data(:,2),'r')
That's so simple I guess I'm missing something, or you are.
  댓글 수: 4
Patrik Ek
Patrik Ek 2014년 3월 3일
@Image Analyst: That was not expected, that matlab would not handle the case of polygons with holes, when plotting. I will remove my answer. I also did some research since it felt a bit incredulous that matlab could not do this. However the solution proposed by you were the most commonly recommended. +1 for that
@Qingping: Answer one is is of course the simplest one. However, to keep direction of the polygons you can check the direction or windiness or what you prefer to call it. The dierction should be opposite if the polygons are properly defined. Depending on standard the direction of the outer polygon may vary, but mathematics it is most often defined counter clockwise. However, MATLAB does in a number of occations define it the other way around (eg in mapping toolbox since this is more or less standard when working with maps)

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Steven Lord
Steven Lord 2019년 9월 19일
Consider creating and plotting a polyshape. You will receive a warning but depending on how you've generated your data you may be able to avoid this.
data=[
0.5, 0.8;
1.0, 0.0;
0.0, 0.0;
0.5, 0.8;
0.5, 0.4;
0.1, 0.1;
0.7, 0.1;
0.5, 0.4;
];
p = polyshape(data);
plot(p)
Or, if you're building the outermost shape then subtracting away the inner holes:
outer=[
0.5, 0.8;
1.0, 0.0;
0.0, 0.0;
0.5, 0.8];
outerP = polyshape(outer);
hole = [
0.5, 0.4;
0.1, 0.1;
0.7, 0.1;
0.5, 0.4;
];
holeP = polyshape(hole);
totalP = subtract(outerP, holeP);
plot(totalP)

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