周口网站建设/广州搜发网络科技有限公司
此动画来源于https://zhuanlan.zhihu.com/p/86152912。
我们不得不承认一个事实：
千言万语比不过一个图表具有说服力 一个动态的图表可以代替多个图表下面我们将从做一个简单的三角函数图形开始说起：这里假设您已具备做简单图像，看懂简单代码的能力。
clear allclcx = 0:0.01:5*pi;y = sin(x);z = cos(x);plot(x,y,'r-','linewidth',2)hold onplot(x,z,'b-','linewidth',2)legend('sin(x)','cos(x)')xlabel('x')ylabel('y/z')set(gca,'fontsize',18)axis([0 16 -1.1 1.1])
以上代码就实现了同一张图同时绘制正弦与余弦的函数图像。那么接下来就要让我们的图像动起来。看一下效果吧！
clear allclc;clfx = 0:0.05:5*pi;y = sin(x);z = cos(x);subplot(211)plot(x,y,'r-','linewidth',2)hold onplot(x,z,'b-','linewidth',2)legend('sin(x)','cos(x)')xlabel('x')ylabel('y/z')set(gca,'fontsize',18)axis([0 16 -1.1 1.1])subplot(212)for ii = 1:length(x) plot(x(1:ii),y(1:ii),'r-o','linewidth',2) hold on plot(x(1:ii),z(1:ii),'b-^','linewidth',2) legend('sin(x)','cos(x)') xlabel('x') ylabel('y/z') set(gca,'fontsize',18) axis([0 16 -1.1 1.1]) xlabel('x') ylabel('y/z') set(gca,'fontsize',18) axis([0 16 -1.1 1.1]) % pause(0.001) drawnowend那么怎么保存为视频或者gif格式呢？
准备工作:
1 getframe函数
% getframe函数
F = getframe
F = getframe(ax)
F = getframe(fig)
F = getframe(___,rect)2 VideoWriter函数
v = VideoWriter(filename)
v = VideoWriter(filename,profile)
v = VideoWriter('peaks.avi');
open(v);
frame = getframe(gcf);
writeVideo(v,frame);
close(v);3 pause函数
pause
pause(n)
pause(state)
oldState = pause(state)4. Imwrite函数
imind = frame2im(MOV);
[imind,cm] = rgb2ind(imind,32);
if nn==100
imwrite(imind,cm,'gif2.gif','gif','LoopCount',Inf,'DelayTime',0.001);
else
imwrite(imind,cm,'gif2.gif','gif','WriteMode','append','DelayTime',0.001);
end
%writeVideo(aviobj,MOV);
pause(0.0001)看一下完整的代码吧！
clear allclc;clfx = 0:0.05:5*pi;y = sin(x);z = cos(x);subplot(211)plot(x,y,'r-','linewidth',2)hold onplot(x,z,'b-','linewidth',2)legend('sin(x)','cos(x)')xlabel('x')ylabel('y/z')set(gca,'fontsize',18)axis([0 16 -1.1 1.1])subplot(212)% for ii = 1:length(x)% plot(x(1:ii),y(1:ii),'r-o','linewidth',2)% hold on% plot(x(1:ii),z(1:ii),'b-^','linewidth',2)% % legend('sin(x)','cos(x)')% xlabel('x')% ylabel('y/z')% set(gca,'fontsize',18)% axis([0 16 -1.1 1.1])% xlabel('x')% ylabel('y/z')% set(gca,'fontsize',18)% axis([0 16 -1.1 1.1])% % pause(0.001)% drawnow% endfilename='donghua1.mp4'v = VideoWriter(filename);open(v);for ii = 1:length(x) plot(x(1:ii),y(1:ii),'r-o','linewidth',2) hold on plot(x(1:ii),z(1:ii),'b-^','linewidth',2) legend('sin(x)','cos(x)') xlabel('x') ylabel('y/z') set(gca,'fontsize',18) axis([0 16 -1.1 1.1]) xlabel('x') ylabel('y/z') set(gca,'fontsize',18) axis([0 16 -1.1 1.1]) frame = getframe(gcf); writeVideo(v,frame); drawnowendclose(v);那么如何保存gif格式呢
clear allclc;clfx = 0:0.2:5*pi;y = sin(x);z = cos(x);subplot(211)plot(x,y,'r-','linewidth',2)hold onplot(x,z,'b-','linewidth',2)legend('sin(x)','cos(x)')xlabel('x')ylabel('y/z')set(gca,'fontsize',18)axis([0 16 -1.1 1.1])subplot(212)% for ii = 1:length(x)% plot(x(1:ii),y(1:ii),'r-o','linewidth',2)% hold on% plot(x(1:ii),z(1:ii),'b-^','linewidth',2)%% legend('sin(x)','cos(x)')% xlabel('x')% ylabel('y/z')% set(gca,'fontsize',18)% axis([0 16 -1.1 1.1])% xlabel('x')% ylabel('y/z')% set(gca,'fontsize',18)% axis([0 16 -1.1 1.1])% % pause(0.001)% drawnow% end% filename='donghua1.mp4'% v = VideoWriter(filename);% open(v);% for ii = 1:length(x)% plot(x(1:ii),y(1:ii),'r-o','linewidth',2)% hold on% plot(x(1:ii),z(1:ii),'b-^','linewidth',2)% % legend('sin(x)','cos(x)')% xlabel('x')% ylabel('y/z')% set(gca,'fontsize',18)% axis([0 16 -1.1 1.1])% xlabel('x')% ylabel('y/z')% set(gca,'fontsize',18)% axis([0 16 -1.1 1.1])% frame = getframe(gcf);% writeVideo(v,frame);% drawnow% end% close(v);% filename='donghua1.mp4'% v = VideoWriter(filename);% open(v);for ii = 1:length(x) plot(x(1:ii),y(1:ii),'r-o','linewidth',2) hold on plot(x(1:ii),z(1:ii),'b-^','linewidth',2) legend('sin(x)','cos(x)') xlabel('x') ylabel('y/z') set(gca,'fontsize',18) axis([0 16 -1.1 1.1]) xlabel('x') ylabel('y/z') set(gca,'fontsize',18) axis([0 16 -1.1 1.1]) frame = getframe(gcf); imind = frame2im(frame); [imind,cm] = rgb2ind(imind,32); if ii==1 imwrite(imind,cm,'gif2.gif','gif','LoopCount',Inf,'DelayTime',0.001); else imwrite(imind,cm,'gif2.gif','gif','WriteMode','append','DelayTime',0.001); end pause(0.0001)end% close(v);