Animating the movement of a figure

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Iñigo de la Joya 2019-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/496299-animating-the-movement-of-a-figure

编辑： Andreas Bernatzky 2019-12-18

I have written a code which makes makes a rectangle rotate about a certain point bya certain angle anticlockwise, but when I proceed on the animation, it draws every single rectangle as it is rotated. How can I make the rectangle rotate without leaving a trace after every iteration?

Here is the code which inolves some funtions:

function [colouredshape] = filledshape(shape,c)
% This function will draw a shape that is filled of a certain colour
fill(shape(1,:),shape(2,:),c);
end
%%%%%%%%%%%%%%%%%%%
function [finalshape] = rotateabout(shape,a,x,y)
% this function will rotate a shape anticlockwise about a certain point rather than the
% origin (angle a, coordinates (x,y))
[newshape] = translate(-x,-y,shape);
[rotatedshape] = rotate(newshape,a);
[finalshape] = translate(x,y,rotatedshape);
end
% This is animation
n = 10;
rectangle1 = [10 10 11 11 10; 1 5 5 1 1];
for a = linspace(0,pi/2,n)
    
    [finalshape] = rotateabout(rectangle1,a,10,5); 
    
filledshape(finalshape,'b')
 
drawnow
pause(0.1)
end

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Answer 1

Andreas Bernatzky 2019-12-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/496299-animating-the-movement-of-a-figure#answer_406236

编辑：Andreas Bernatzky 2019-12-13

在 MATLAB Online 中打开

A rough and quick example:

for(n=1:1:360)
    RectangleData = calcRectangle(n); %calculate your new position
    hRectangle = plot(RectangleData); % plot your rectangle
    % Now get rid of it.
    delete(hRectangle); %clear your plot
end

I can not test your code at the moment. But try the delete() after your pause()

Hope I could help

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Iñigo de la Joya 2019-12-18

Sorry but this doesnt work when I run it on Matlab. It draws a very strange random pattern if you try it.

One question: when I use a function to for example draw a figure, how can I store it inside a variable so that I can then delete the figure?

Andreas Bernatzky 2019-12-18

编辑：Andreas Bernatzky 2019-12-18

在 MATLAB Online 中打开

The strange pattern is normal because I use the rand() function.

you should see some blue and white shapes. (look at picture)

Maybe my example was a little bit confusing.

For your question:

FigureStorage = plot(someXvalues,someYvalues);
delete(FigureStorage);

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Animating the movement of a figure

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Animating the movement of a figure

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