大家会吗？Matlab中的图形对象的选择
图形对象的选择在本例中的程序可以探测图形对象的属性，并显示如何用函数waitforbuttonpress和gco选择对象。程序允许用户可以多次重复选择对象。% Script file: select_object.m%% Purpose:% This program illustrates the use of waitforbuttonpress% and gco to select graphics objects. It creates a plot% of sin(x) and cos(x), and then allows a user to select% any object and examine its properties. The program% terminates when a key press occurs.%% Record of revisions:% Date Programmer Description of change% ==== ========== =====================% 11/23/97 S. J. Chapman Originalcode%% Define variables:% details -- Object details% H1 -- Handle of sine line% H2 -- Handle of cosine line% Handle -- Handle of current object% k -- Result of waitforbuttonpress% type -- Object type% x -- Independent variable% y1 -- sin(x)% y2 -- cos(x)% yn -- Yes/No% Calculate sin(x) and cos(x)x = -3*pi:pi/10:3*pi;y1 = sin(x);y2 = cos(x);% Plot the functions.H1 = plot(x,y1);set(H1,'LineWidth',2);hold on;H2 = plot(x,y2);set(H2,'LineWidth',2,'LineStyle',':','Color','r');title('\bfPlot of sin \itx \rm\bf and cos \itx');xlabel('\bf\itx');ylabel('\bfsin \itx \rm\bf and cos \itx');legend('sine','cosine');hold off;% Now set up a loop and wait for a mouse click.k = waitforbuttonpress;while k == 0 % Get the handle of theobject Handle = gco; % Get the type of thisobject. type = get(Handle,'Type'); % Display object type disp (['Object type = 'type '.']); % Do we display thedetails? yn = input('Do you want todisplay details? (y/n) ','s'); if yn == 'y' details = get(Handle); disp(details); end % Check for another mouseclick k = waitforbuttonpress;end% Script file: select_object.m
%
% Purpose:
% This program illustrates the use of waitforbuttonpress
% and gco to select graphics objects. It creates a plot
% of sin(x) and cos(x), and then allows a user to select
% any object and examine its properties. The program
% terminates when a key press occurs.
%
% Record of revisions:
% Date Programmer Description of change
% ==== ========== =====================
% 11/23/97 S. J. Chapman Original code
%
% Define variables:
% details -- Object details
% H1 -- Handle of sine line
% H2 -- Handle of cosine line
% Handle -- Handle of current object
% k -- Result of waitforbuttonpress
% type -- Object type
% x -- Independent variable
% y1 -- sin(x)
% y2 -- cos(x)
% yn -- Yes/No
% Calculate sin(x) and cos(x)
x = -3*pi:pi/10:3*pi;
y1 = sin(x);
y2 = cos(x);
% Plot the functions.
H1 = plot(x,y1);
set(H1,'LineWidth',2);
hold on;
H2 = plot(x,y2);
set(H2,'LineWidth',2,'LineStyle',':','Color','r');
title('\bfPlot of sin \itx \rm\bf and cos \itx');
xlabel('\bf\itx');
ylabel('\bfsin \itx \rm\bf and cos \itx');
legend('sine','cosine');
hold off;
% Now set up a loop and wait for a mouse click.
k = waitforbuttonpress;
while k == 0
% Get the handle of the object
Handle = gco;
% Get the type of this object.
type = get(Handle,'Type');
% Display object type
disp (['Object type = ' type '.']);
% Do we display the details?
yn = input('Do you want to display details? (y/n) ','s');
if yn == 'y'
details = get(Handle);
disp(details);
end
% Check for another mouse click
k = waitforbuttonpress;
end
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