www.gusucode.com > Modeling Pneumatic Robot Actuators 工具箱matlab源码程序 > Modeling Pneumatic Robot Actuators/MSRA_PneumaticRobotSeries/Libraries/MultipartsLib/Extrusion_Scripts/Extr_Data_Calc_Area.m
function area = Extr_Data_Calc_Area(xy_poly) %Extr_Data_Calc_Area Compute area of a planar polygon % area = Extr_Data_Calc_Area(xy_data) % Returns the area for a planar polygon specified by an N x 2 matrix. % This method will produce the wrong answer for self-intersecting % polygons (one side crosses over another). It will work correctly for % triangles, regular and irregular polygons, convex or concave polygons. % % Area is equal to one-half the sum of the determinants: % % | x_i y_i | % | | % | x_{i+1} y_{i+1} | % % as i ranges over [1, N] and i+1 is computed in modular fashion. % Copyright 2017-2018 The MathWorks, Inc. area = sum(sum(xy_poly .* ([1 -1] .* circshift(xy_poly, [-1 1])))) / 2;