how not to delete one figure using clf?

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Sierra
Sierra 2022-12-26
回答： Jan 2022-12-26
I want to plot animation with a background image.
but for animation, i used clf in for loop.
so the backgorund image is deleted because of clf.
here is my code.
open('example.fig')
for i = 1:length(TX)
clf
plot3(TX(1,i),TX(2,i),TX(3,i),'o','markerfacecolor','r','markersize',10,'markeredgecolor','k');
hold on
VVS = VV{i};
VV_lon = VVS(1,:);
VV_lat = VVS(2,:);
VV_alt = VVS(3,:);
plot3(VV_lon,VV_lat,VV_alt,'b--')
drawnow; pause(0.1)
end
thanks.

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回答（1 个）

Jan
Jan 2022-12-26
clf clears the contents of the current figure. If you do not want this, remove clf.
Maybe all you want is to clear the current axes. Then use gca instead. This causes some flickering. Animating objects is smoother, if they are not created repeatedly, but the values are adjusted.
axesH = axes('NextPlot', 'add'); % as: hold on
H1 = plot3(TX(1,1), TX(2,1), TX(3,1), 'o', ...
'markerfacecolor','r','markersize',10,'markeredgecolor','k');
for i = 1:length(TX)
pause(0.1); % No additional drawnow required
set(H1, 'XData', TX(1,1), 'YData', TX(2,1), 'ZData', TX(3,1));
end

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