I've specified axis limits manually, why do they resize during animation?
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I'm animating uploaded data from a GUI. The animation is a trail of data that adds new values as dark blue and old values trail off into white, they translate across S from 1->0 in HSV color space. When I run the animation from the GUI - I'm using the App Editor - the axis limits gets recalculated every frame of the animation, it's awful. But they work fine when I'm not using the GUI. Do I need to set the axes limits another way?
I specify axis limits using axis as follows
axis(1.1*[-boardWid/2 boardWid/2 -boardHei/2 boardHei/2])
Also, my code, the one that does work (from a script)
figure(1), clf
boardWid = 600;
boardHei = 400;
numtrail = 15; % amount of trailing markers
t = linspace(0,2*pi);
datax = boardWid/2 * cos(t);
datay = boardHei/2 * sin(t);
hsvcmap = [0.6*ones(numtrail,1), linspace(1,0,numtrail)', ones(numtrail,1)];
ax = scatter(datax(1:numtrail), datay(1:numtrail), [], hsv2rgb(hsvcmap), 'filled');
axis(1.1*[-boardWid/2 boardWid/2 -boardHei/2 boardHei/2])
daspect([1 1 1]) % specify axes ratio to agree with board in visual space
%%play/make the animation
%%maybe we want to make a movie instead
for frame = (numtrail+1):length(datax)
ax.XData = [datax(frame) ax.XData(1:end-1)];
ax.YData = [datay(frame) ax.YData(1:end-1)];
drawnow
pause(0.01)
end
and the code that doesn't is embedded in the mess of the app files, but here's the function that implements the animation routine.
function results = generateTrailingScatterAnimation(app, datax, datay, numtrail)
boardWid = 600;
boardHei = 400;
cla(app.UIAxes);
hsvcmap = [0.6*ones(numtrail,1), linspace(1,0,numtrail)', ones(numtrail,1)];
ax = scatter(app.UIAxes, datax(1:numtrail), datay(1:numtrail),...
[], hsv2rgb(hsvcmap), 'filled');
axis(1.1*[-boardWid/2 boardWid/2 -boardHei/2 boardHei/2])
daspect([1 1 1]) % specify axes ratio to agree with board in visual space
%%play/make the animation
%%maybe we want to make a movie instead
for frame = (numtrail+1):length(datax)
ax.XData = [datax(frame) ax.XData(1:end-1)];
ax.YData = [datay(frame) ax.YData(1:end-1)];
drawnow
pause(0.01)
end
end
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採用された回答
Image Analyst
2017 年 11 月 6 日
MATLAB automatically adjusts the axes each time you plot or add to it. To use fixed axes, you can put hold on once they are what you like,
hold on;
or you can use the xlim() and ylim() functions.
xlim([xLow, xHigh]);
ylim([yLow, yHigh]);
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