How can I add a point to an animation?

Question

BeHu 2018-6-26

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/407527-how-can-i-add-a-point-to-an-animation

回答： Sammit Jain 2018-6-27

I want to add the point b3 to the animation so that every in the end every b3 is in the animation

r =0;
s= 2;
z = [15, 0; 7, 10; 3, 4; 3, 6];
axis(gca, 'equal');
axis([0 16 0 20]);
k = 1;
for t = r:0.01:s
    ...
      b3 = (1 - lambda ) * b2(1,:) + lambda * b2(2, :);
      i
          crank1 = line(z(:,1), z(:,2));
          crank2 = line(b1(:,1), b1(:,2));
          crank3 = line(b2(:,1), b2(:,2));
          crank4 = line(b3(1), b3(2));
          pause(0.1);
          delete(crank1);
          delete(crank2);
          delete(crank3);
          delete(crank4);
      end
      x = b3;
  end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

KSSV 2018-6-27

Most of the variables are not defined..what is b3? it's dimensions?

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Sayyed Ahmad 2018-6-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/407527-how-can-i-add-a-point-to-an-animation#answer_326450

在 MATLAB Online 中打开

you need to add in your code

hold on

otherweise you create every time a new graph and your point is not exist anymore.

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

Sammit Jain 2018-6-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/407527-how-can-i-add-a-point-to-an-animation#answer_326451

Hi, since the exact context of the code isn't clear, I'm making the following assumptions:

You're probably trying to simulate/animate some form of a crank-slider mechanism.
You're opening a figure window and plotting these lines continuously. These coordinates are updated in a for loop
b3 is one point represented as [x,y]. (From the code it looks like it's a weighted average based on lambda)

In this case, your question boils down to representing a single point in a plot window. Now since you're animating, a simple way for you to do this is to use the 'viscircles' command. This will allow you to make an approximate representation of a point with a tiny circle.

Check out the documentation for viscircles

With this you can make a visual representation of the ‘point’ by centering a circle on the x,y coordinates for the point (which are stored in b3), with a small radius. The circle will be drawn using the afore-mentioned viscircles command. You will have to choose a radius according to the scale of your animation.

Hope this helps.