Animate a rectangle, for loop used
10 Ansichten (letzte 30 Tage)
Ältere Kommentare anzeigen
Anastasia Zistatsis
am 16 Feb. 2021
Kommentiert: Image Analyst
am 17 Feb. 2021
Hello! The code below takes a large matrix (x) and shows 'o' moving up and down on a plot. I would like to change the 'o' into a rectangle moving in the same way, hanging by a string. How would I do this?
for i = 1:125
plot(x(i),'o')
axis([0 5 -5 5])
y(i) = getframe
end
movie(y,25,25)
Akzeptierte Antwort
Image Analyst
am 17 Feb. 2021
Use the rectangle() function. Get it's handle so you can delete the old one when you want to place a new one.
2 Kommentare
Image Analyst
am 17 Feb. 2021
Anastasia, see this little animation demo.
% Initialization steps.
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
clear; % Erase all existing variables. Or clearvars if you want.
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 13;
% Define oscillation parameters.
period = 10;
t = linspace(0, 5 * pi, 100);
y = 30 * sin(2 * pi * t / period);
% Define graphics parameters:
rectangleHeight = 10;
rectangleWidth = 10;
rectangleX1 = 10;
lineX = 15;
% Set up axes.
grid on;
ylim([-50, 50]);
xlim([0, 30]);
xlabel('X', 'FontSize', 15);
ylabel('Y', 'FontSize', 15);
% Start the movement:
for k = 1 : length(y)
caption = sprintf('Iteration %d, y(%d) = %f', k, k, y(k));
fprintf('%s\n', caption);
% Place a rectangle at the current y location.
r = rectangle('Position', [rectangleX1, y(k), rectangleWidth, rectangleHeight], 'FaceColor', 'r');
title(caption, 'FontSize', 15);
% Drawline from to to top of rectangle.
hLine = line([lineX, lineX], [50, y(k)+rectangleHeight], 'LineWidth', 5, 'Color', 'b');
drawnow;
% Wait long enough to see it at this location.
pause(0.1)
% Delete the rectangle to prepare for the next one.
if k < length(y) % Don't delete the very last one.
delete(r);
delete(hLine);
end
end
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/521977/image.png)
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Interactive Control and Callbacks finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!