I have managed to edit a piece of code that was given to me in order to show a point moving along a curve.
I am trying to find a way to edit this in order to create two independent points moving along this curve or to create a second figure that shows another point moving along a graph. The main point is that the points need to be independent of one another so that an algorithm can be applied to them.
I currently have the following code which gives a single point moving along the curve:
%# control animation speed
DELAY = 0.01;
numPoints = 600;
%# create data
x = linspace(0,1,numPoints);
f = 5;
C = 1-exp(-f);
y = C*(1-(exp(-f*x)));
%# plot graph
figure('DoubleBuffer','on') %# no flickering
plot(x,y, 'LineWidth',2), grid on
xlabel('x'), ylabel('y'), title('')
%# create moving point + coords text
hLine = line('XData',x(1), 'YData',y(1), 'Color','r', ...
'Marker','o', 'MarkerSize',6, 'LineWidth',2);
hTxt = text(x(1), y(1), sprintf('(%.3f,%.3f)',x(1),y(1)), ...
'Color',[0.2 0.2 0.2], 'FontSize',8, ...
'HorizontalAlignment','left', 'VerticalAlignment','top');
%# infinite loop
i = 1; %# index
while true
%# update point & text
set(hLine, 'XData',x(i), 'YData',y(i))
set(hTxt, 'Position',[x(i) y(i)], ...
'String',sprintf('(%.3f,%.3f)',[x(i) y(i)]))
drawnow %# force refresh
%#pause(DELAY) %# slow down animation
i = rem(i+1,numPoints)+1; %# circular increment
if ~ishandle(hLine), break; end %# in case you close the figure
end
Here's how you can add another point that starts sliding from the end independent of the first point.
In your code, before the line %#Infinite loop
, add the following:
hLine2 = line('XData',x(end), 'YData',y(end), 'Color','g', ...
'Marker','o', 'MarkerSize',6, 'LineWidth',2);
hTxt2 = text(x(end), y(end), sprintf('(%.3f,%.3f)',x(1),y(1)), ...
'Color',[0.2 0.2 0.2], 'FontSize',8, ...
'HorizontalAlignment','left', 'VerticalAlignment','top');
and inside the loop, before the drawnow
command, add the following:
set(hLine2, 'XData',x(end-i), 'YData',y(end-i))
set(hTxt2, 'Position',[x(end-i) y(end-i)], ...
'String',sprintf('(%.3f,%.3f)',[x(end-i) y(end-i)]))
So your second point slides down and the first slides up. You can define the trajectory for the point as you wish in the definition of hLine2
and hTxt2
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