MATLAB: How to make a point in matlab AVI video moving in a radom path

matlab avi 2dvideo

I made a 2D AVI animation in Matlab, there are one green dot and one blue dot moving along a line into different directions. But now i want to add into this AVI animation video another dot, which move in a random path together with the other two dots, what should i write codes here now ? attached below is my codes. Thanks very much for your help!
%time steps
      N=20;
%start position of one moving object
      x_pos=10;
      y_pos=10;
      x1_pos=100;
      y1_pos=100;
%speed of the moving object
      speed_x=3;
      speed_y=2;
      speed_x1=-4;
      speed_y1=-2;
%ini white image with size 100 x 150
      image=ones(100,150,3);
%initialization of videowriter
      outputVideo = VideoWriter('test.avi');
      outputVideo.FrameRate = 5; %set frame rate of the image
      open(outputVideo)  
%drawing a moving object on an image plane and creating the video
      for i=1:N
%update states of moving object
      x_pos=x_pos+speed_x;
      y_pos=y_pos+speed_y;
      x1_pos=x1_pos+speed_x1;
      y1_pos=y1_pos+speed_y1;
%draw the measurement on the image using a green point with specific size
      size=4;
      image((x_pos-size/2):(x_pos+size/2),(y_pos-size/2):(y_pos+size/2),1)=0;
      image((x_pos-size/2):(x_pos+size/2),(y_pos-size/2):(y_pos+size/2),3)=0;
      image((x1_pos-size/2):(x1_pos+size/2),(y1_pos-size/2):(y1_pos+size/2),2)=0;
      image((x1_pos-size/2):(y1_pos+size/2),(y1_pos-size/2):(y1_pos+size/2),1)=0;
%give the image to the video writer object
      writeVideo(outputVideo,image)

Best Answer

See my attached demo that you can adapt to do that.
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