MATLAB使用绘图plot制作动态GIF

1 前言

在PPT展示或者博客创作中，有时需要插入动态图如GIF，来演示算法效果或者结果。在MATLAB中，可以通过一些代码，将绘图plot转化为动态的GIF。

其大致方法为，写一个循环，每个循环为一个帧，绘制该帧的内容，将此时figure的内容转化为一帧图像，定义两帧的间隔，然后添加到GIF中（第一帧和其他帧的处理方式不一样，详见代码）。

如果想将GIF插入到CSDN博客中，只需要点击工具栏中的图片，然后添加即可。

效果如下：

2 Demo

这里提供两个demo。

Demo 1 - 不使用函数

需要一个文件，create_gif_demo_1.m
需要修改的只有两处：

• 文件名。这里文件名为animation.gif，注意不要漏了后缀。这样会在当前目录下，生成GIF文件。
• 帧间隔。这里设置的时间间隔为0.1s，可以根据需要修改。

clear all
clc

% Define the time steps for your animation
timeSteps = 0:0.1:2*pi;

% Create a figure handle
figure;

% Loop through each time step
for i = 1:length(timeSteps)
    % Generate your plot for each time step
    x = linspace(0, 2*pi, 100);
    y = sin(x + timeSteps(i));
    
    % Plot customization
    plot(x, y, 'LineWidth', 2);
    title('Sinusoidal Wave Animation');
    xlabel('X-axis');
    ylabel('Y-axis');
    
    % Capture the current frame
    frame = getframe(gcf);
    
    % Convert the frame to an image matrix
    img = frame2im(frame);
    [A,map] = rgb2ind(img,256);
    % Save the image as a GIF (adjust filename as needed)
    if i == 1
        imwrite(A,map, 'animation.gif', 'gif', 'Loopcount', inf, 'DelayTime', 0.1);
    else
        imwrite(A,map, 'animation.gif', 'gif', 'WriteMode', 'append', 'DelayTime', 0.1);
    end
    
	% Pause to create a smooth animation
	pause(0.1);% For real-time viewing only, can be removed
end

% Display a message indicating successful GIF creation
disp('GIF animation created successfully.');
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Demo 2 - 使用函数

需要两个文件（放在同一目录下）：create_gif.m和create_gif_demo_2.m
不同于demo 1的地方在于，这里把和GIF相关的代码封装进一个函数里。
这样只需要传入参数：是否为第一帧的flag，帧与帧的时间间隔，GIF文件名称。

function [] = create_gif(flag,delay_time,name_of_the_file)
    % 
    % Capture the current frame
    frame = getframe(gcf);
    
    % Convert the frame to an image matrix
    img = frame2im(frame);
    [A,map] = rgb2ind(img,256);
    
    % Save the image as a GIF (adjust filename as needed)
    if flag == 1 % flag == 1 means it's the first frame
        imwrite(A,map, name_of_the_file, 'gif', 'Loopcount', inf, 'DelayTime', delay_time);
    else
        imwrite(A,map, name_of_the_file, 'gif', 'WriteMode', 'append', 'DelayTime', delay_time);
    end
end
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clear all
clc

delay = 0.1; % delay between frames, 0.1s
file_name = 'gif_demo_2.gif'; % file name, careful about the .gif suffix

% Define the time steps for your animation
timeSteps = 0:0.1:2*pi;

% Create a figure handle
figure;

% Loop through each time step
for i = 1:length(timeSteps)
    % Generate your plot for each time step
    x = linspace(0, 2*pi, 100);
    y = sin(x + timeSteps(i));
    
    % Plot customization
    plot(x, y, 'LineWidth', 2);
    title('Sinusoidal Wave Animation');
    xlabel('X-axis');
    ylabel('Y-axis');
    
    % Create GIF
    flag = i; % flag to indicate whether it's the first frame
    create_gif(flag, delay, file_name);
    
	% Pause to create a smooth animation
	pause(0.1);% For real-time viewing only, can be removed
end

% Display a message indicating successful GIF creation
disp('GIF animation created successfully.');
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