Get next plot color

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David C
David C 2011-7-11
评论： Alexandra Gallyas Sanhueza 2021-4-29
When using the function plot with hold set to 'all', each call to plot uses the successive entry in the ColorOrder property of the current axes. Is there a way to find out what is the color the next call to plot will use, if it is not known how many calls to plot have already been executed?
In other words, here is an example to clarify my question: plot(x,bob) hold all plot(x,garry) ... (unknown number of calls to plot)
What will be the color of the next plot?
Thanks, David
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Walter Roberson
Walter Roberson 2011-7-11
There are many plotting functions that add multiple children -- though the top level child might be an hggroup .
plot() adds multiple line() objects; bar() adds multiple patch() objects; boxplot() adds a combination of objects; polar() adds a combination of objects; contour() adds an hggroup that has patch() objects and text() objects as its children...
David C
David C 2011-7-13
Thank you for the input everyone.

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Daniel Shub
Daniel Shub 2011-7-11
I think the number of children should equal the number of calls to plot. You need to use mod to loop through the colors (i.e if the number of plots is greater than the number of colors).
colorOrder = get(gca, 'ColorOrder');
plot(1:10, 'Color', colorOrder(mod(length(get(gca, 'Children')), size(colorOrder, 1))+1, :))
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Daniel Shub
Daniel Shub 2011-7-11
To deal with Walter's observation about plotyy, I guess you would need to check the figure for all children which are axes. You then might want to count the children of any axes which have identical positions to the axis you are interested in.
David C
David C 2011-7-13
Your code works well with plot(), which is what I'm using. I like how your code handles the corner cases with mod perfectly.

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更多回答（5 个）

Jan
Jan 2011-7-11
What about trying it:
lineH = plot(1,1);
color = get(lineH, 'Color');
delete(lineH);
[EDITED]: Walter's comment pointed me to the fact, that the intermediate creation of a PLOT line changes the next color. This is not working
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David C
David C 2011-7-13
Although not ideal for the purpose I had in mind, it is a good idea.
Alexandra Gallyas Sanhueza
Alexandra Gallyas Sanhueza 2021-4-29
I was actually searching how to advance to the next color and this works :)

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Teja Muppirala
Teja Muppirala 2011-7-13
This seems to work ok:
figure
hold all;
plot(rand(5,3));
h = plot(nan,nan);
nextcolor = get(h,'color')
h = plot(nan(2,size(get(gca,'colororder'),1)-1)); %Loop back
delete(h)
plot(rand(1,10)) %<-- This line's color is "nextcolor"
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David C
David C 2011-7-13
This is very clever; thank you. As Daniel's answer was the first that worked for me, I have accepted his answer.
Jan
Jan 2011-7-13
If the LineStyleOrder is not scalar, it should be considered also.

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John Barber
John Barber 2011-7-14
The next color to be used by a call to plot is stored as an index into the list of colors in the axes' ColorOrder property. You can access this index using:
NextColor = getappdata(hAx,'PlotColorIndex')
where hAx is the handle of the axes of interest. This is an undocumented feature, so it may not work in all MATLAB versions (I'm using R2010a / 7.10)
Jim Hokanson
Jim Hokanson 2017-1-9
编辑：Jim Hokanson 2017-1-9
In newer versions of Matlab the state is stored in the axes as 'ColorOrderIndex'. In 2016b, this wraps, and you can get values from 1 to (n_colors+1) which after (n_colors+1) goes back to 2 (you only see 1 at the start of a plot, at least in this version).
So the next color is:
colors = get(gca,'ColorOrder');
index = get(gca,'ColorOrderIndex');
n_colors = size(colors,1);
if index > n_colors
index = 1;
end
next_color = colors(index,:);
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J. Alex Lee
J. Alex Lee 2020-4-10
Update in 2020 (not sure about previous versions), but it is now an exposed property in the axes:
ax = gca;
ax.ColorOrder
ax.ColorOrderIndex
Works for uiaxes() as well

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Mauro
Mauro 2014-8-18
to get the colour from the 1th to the 20th lineplot, type
cm = lines(20);
after the 7th line it starts again with blue [0 0 1]
so
figure(1)
clf
plot(randn(50,10)*0.1+repmat((1:10),50,1))
ist the same as
figure(1)
clf
cm = lines(10)
hold on
for k = 1:10
plot(randn(50,1)*0.1+k,'color',cm(k,:))
end

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