Remove underlying graph and eliminate flickering.

Question

SS 2020-8-15

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https://ww2.mathworks.cn/matlabcentral/answers/580065-remove-underlying-graph-and-eliminate-flickering

评论： SS 2020-8-20

Hello, I have a code that shows a dot moving up and down on a picture. However, the dot is moving on an underlying sin curve so when I run the program, the whole thing flickers. I want to remove the flickering and only show the dot moving on the picture without seeing the sine curve. How would I do this?

x = 0:.01:50; %linspace of x

y = sin(x); %wave equation

px = 10; %initial x plot

py = 0; %initial y plot

img =imread('AvgBscan.tiff'); %read in image

for i=1:630 %loop

imshow(img);

set(gcf,'DoubleBuffer', 'off');

h = patch([0 1 0 1], [0 1 1 0], 'r');

hold on

figure(100);%so code will replot over the previous figure, and not make a new one.

hold off

py = y(i)

plot(x,y, px, py,'o'); %circle point

pause(0.05); %speed of moving point

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Answer 1

Steven Lord 2020-8-15

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Don't keep plotting and deleting graphics objects. I recommend the "Update the properties of a graphics object and display the updates on the screen" approach described on this documentation page. The first two Related Topics on that page demonstrate two techniques by which you can do that.

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SS 2020-8-20

I read through the related topics but it didn't really cover how to move the point off the line. I do not want the sine wave to be shown under the picture, I just want to see the point moving up and down. How would I do this?

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