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_Ellipse.m
function [xy_data] = Extr_Data_Ellipse(a, b, deg1, deg2, ctr, varargin) %Extr_Data_Ellipse Produce extrusion data for an ellipse. % [xy_data] = Extr_Data_Ellipse(a, b, deg1, deg2, ctr, varargin) % This function returns x-y data for a ring. % You can specify: % Radius 1 a % Radius 2 b % Start angle deg1 % Finish angle deg2 % Include Center ctr % % To see a plot showing parameter values, enter the name % of the function with no arguments % >> Extr_Data_Ellipse % % To see a plot created with your parameter values, % add 'plot' as the final argument % >> Extr_Data_Ellipse(5,2,60,315,1,'plot') % Copyright 2012-2018 The MathWorks, Inc. % Default data to show diagram if (nargin == 0) a = 5; b = 2; deg1 = 60; deg2 = 315; ctr = 1; end % Check if plot should be produced if (isempty(varargin)) showplot = 'n'; else showplot = varargin; end % Calculate quarter of ellipse xdata = a:-a/50:0; for i=1:length(xdata) ydata(i) = b/a*sqrt(a^2-xdata(i)^2); end % Full outer ellipse xy_data = [xdata -fliplr(xdata(1:end-1)) -xdata(2:end) fliplr(xdata(1:end-1)); ydata fliplr(ydata(1:end-1)) -ydata(2:end) -fliplr(ydata(1:end-1))]'; % Determine start and stop angles = unwrap(atan2(xy_data(:,2),xy_data(:,1)))*180/pi; start = find(angles>=deg1); start_ind = start(1); finish = find(angles<=deg2); finish_ind = finish(end); % Determine connection between start and finish if (ctr == 0) xy_data = [0 0; xy_data(start_ind:finish_ind,:)]; elseif (ctr == 1) xy_data = [xy_data(start_ind:finish_ind,:)]; else xy_data = [xy_data(start_ind:finish_ind,:);flipud(xy_data(start_ind:finish_ind,:))*ctr]; end % Plot diagram to show parameters and extrusion if (nargin == 0 || strcmpi(showplot,'plot')) % Figure name figString = ['h1_' mfilename]; % Only create a figure if no figure exists figExist = 0; fig_hExist = evalin('base',['exist(''' figString ''')']); if (fig_hExist) figExist = evalin('base',['ishandle(' figString ') && strcmp(get(' figString ', ''type''), ''figure'')']); end if ~figExist fig_h = figure('Name',figString); assignin('base',figString,fig_h); else fig_h = evalin('base',figString); end figure(fig_h) clf(fig_h) % Plot extrusion patch(xy_data(:,1),xy_data(:,2),[1 1 1]*0.90,'EdgeColor','none'); hold on plot(xy_data(:,1),xy_data(:,2),'-','Marker','o','MarkerSize',4,'LineWidth',2); % plot(xy_data(:,1),xy_data(:,2),'-','Marker','.','MarkerSize',12,'LineWidth',1.5); axis('equal'); axis([-1.1 1.1 -1.1 1.1]*max(a,b)); % Show parameters hold on a_label_ang = 180; b_label_ang = 90; plot([0 a*(cos(a_label_ang*pi/180))],[0 a*(sin(a_label_ang*pi/180))],'r-d','MarkerFaceColor','r'); text(cos(a_label_ang*pi/180)*0.75*a,sin(a_label_ang*pi/180)*0.75*a,'{\color{red}a}'); plot([0 b*(cos(b_label_ang*pi/180))],[0 b*(sin(b_label_ang*pi/180))],'g-d','MarkerFaceColor','g'); text(cos(b_label_ang*pi/180)*0.5*b,sin(b_label_ang*pi/180)*0.5*b,'{\color{green}b}'); plot([0 a],[0 0],'k:'); plot([0 b*cos(deg1*pi/180)],[0 b*sin(deg1*pi/180)],'k:'); plot([0 b*cos(deg2*pi/180)],[0 b*sin(deg2*pi/180)],'k:'); arc1_r = 0.6*b; arc1 = [(0:1:deg1)]'*pi/180; plot(cos(arc1)*arc1_r,sin(arc1)*arc1_r,'k-'); plot(cos(arc1(1))*arc1_r,sin(arc1(1))*arc1_r,'kd','MarkerFaceColor','k'); plot(cos(arc1(end))*arc1_r,sin(arc1(end))*arc1_r,'kd','MarkerFaceColor','k'); text(cos(deg1/2*pi/180)*arc1_r*1.1,sin(deg1/2*pi/180)*arc1_r*1.1,'deg1'); arc2_r = 0.25*b; arc2 = [(0:1:deg2)]'*pi/180; plot(cos(arc2)*arc2_r,sin(arc2)*arc2_r,'k-'); plot(cos(arc2(1))*arc2_r,sin(arc2(1))*arc2_r,'kd','MarkerFaceColor','k'); plot(cos(arc2(end))*arc2_r,sin(arc2(end))*arc2_r,'kd','MarkerFaceColor','k'); text(cos(0.7*deg2*pi/180)*arc2_r*2,sin(0.7*deg2*pi/180)*arc2_r*2,'deg2'); text(-a,0.75*a,'ctr = 0, center point included'); text(-a,0.65*a,'ctr >0 & <1, hollow ellipse created'); text(-a,0.55*a,'ctr = 1, chord connects ends'); title(['[xy\_data] = Extr\_Data\_Ellipse(a, b, deg1, deg2, ctr);']); hold off box on clear xy_data end