www.gusucode.com > matlab 案例源码 matlab代码程序 > matlab/AlphaShapeFrom2DPointCloudExample.m
%% Alpha Shape from 2-D Point Cloud % Create and plot a set of 2-D points. % Copyright 2015 The MathWorks, Inc. th = (pi/12:pi/12:2*pi)'; x1 = [reshape(cos(th)*(1:5), numel(cos(th)*(1:5)),1); 0]; y1 = [reshape(sin(th)*(1:5), numel(sin(th)*(1:5)),1); 0]; x = [x1; x1+15]; y = [y1; y1]; plot(x,y,'.') axis equal %% % Compute an alpha shape for the point set using the default alpha % radius. shp = alphaShape(x,y); plot(shp) %% % Check the value of the default alpha radius. shp.Alpha %% % The default alpha radius results in an alpha shape with a % jagged boundary. To better capture the boundary of the point set, try a % larger alpha radius. %% % Compute an alpha shape using an alpha value of 2.5. shp.Alpha = 2.5; plot(shp)