How to number vertices in a delaunay triangulation in a plot

Question

aasha verghese 2022-6-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1741585-how-to-number-vertices-in-a-delaunay-triangulation-in-a-plot

评论： aasha verghese 2022-6-17

采纳的回答： Steven Lord

Hi,

How to display numbers or ids of vertices in Delaunay triangulation plot. I am able to draw a circle for the nodes.

triplot(newDT,'-ob');

But how to show the specific vertex numbers in the plot?

Thanks

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

Steven Lord 2022-6-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1741585-how-to-number-vertices-in-a-delaunay-triangulation-in-a-plot#answer_987000

在 MATLAB Online 中打开

Let's make a sample delaunayTriangulation and plot it.

x = rand(20,1);
y = rand(20,1);
dt = delaunayTriangulation(x,y);
triplot(dt);

Create an array of labels for the points. I'm just using the indices of each point, but if your points have some meaning (cities, for example) you could build your vector of labels taking advantage of that information.

labels = string(1:numel(x))
labels = 1×20 string array
    "1"    "2"    "3"    "4"    "5"    "6"    "7"    "8"    "9"    "10"    "11"    "12"    "13"    "14"    "15"    "16"    "17"    "18"    "19"    "20"

Add the labels to the plot. If you wanted to be fancier you could add a slight offset to the x and/or y coordinates so the text appears a little bit further away from the point to which they correspond.

text(x, y, labels)

Let's spot check. Does the code below circle point 15?

hold on

plot(x(15), y(15), 'ro', 'MarkerSize', 20)