How to plot a hatched data set over a contour plot?

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HA
HA 2018-5-15
评论： Niccolò Moro 2020-6-8
I have contour plot, that I would like to add another layer to, this layer displays a region of significance, therefore it would make sense to have it as a hatched area over my original data set. I have tried a couple of the 'hatchfill' functions for the file exchange but they do not seem to work (or at least I am probably doing them wrong).
In addition to this I also have plots that I created using the 'pcolorps' function from the Antarctic toolbox (file exchange), If anyone has had experience adding hatched markings to these plots that would also be great, as I think it may be slightly different.
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jonas
jonas 2018-5-15
编辑：jonas 2018-5-15
Just to clarify. You have a contour plot and you want to plot a transparent hatched pattern on top of the original contour plot, over a defined region on the surface? For example:
contourf(1:10,1:10,rand(10,10))
hp=patch([4 6 6 4],[4 4 6 6],'r')
hatchfill(hp);
Something like that?
EDIT: in your first example which almost works, try setting 'fill' to 'off'
hh = hatchfill2(hp,'cross','LineWidth',1,'Fill','off');
HA
HA 2018-5-15
Yes, that is what I want, unfortunately the base for the hatching is still showing up under the hatching even with fill off.

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回答（1 个）

jonas
jonas 2018-5-15
编辑：jonas 2018-5-15
If you want to hatch an area based on your data, then try something like this:
figure;hold on
[x,y]=meshgrid(1:49,1:49)
z=peaks;
[~,h1]=contourf(x,y,z)
[~,h2]=contourf(x,y,z,[1.5 1.5])
set(h2,'linestyle','none','Tag','HatchingRegion','fill','off');
hp = findobj(h2,'Tag','HatchingRegion');
hh = hatchfill2(hp,'cross','LineWidth',1,'Fill','off');
h1 is the handle of your 'background' and h2 is the handle of your hatched plot. The vector [1.5 1.5] sets the 'z-value' for your hatch.
If you instead want to hatch a defined region, then just use patch instead:
figure;
contourf(x,y,z)
hp=patch([4 20 20 4],[20 20 6 6],'r')
hf=hatchfill2(hp);
hp.FaceColor='none'
Hope it helps
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Niccolò Moro
Niccolò Moro 2020-6-8
Hi Jonas,
I am far from a matlab pro and trying to implement your option in a similar context. I have a contour map on top of which I'd like to hatch all values of another contour higher than a certain threshold.
This is the current plot:
I have population data (with the same meshgrid as the already plotted contour). I'd like to mark regions with high population density and regions with even higher densities.
I keep getting the error "Unsupported graphics handle type." on the fourth last of those lines:
At the moment this is the code:
[~, h2]=contourf(xll, yll, concTotal, [1.5 1.5], 'linecolor', 'none'); % tbh i don't understand what the [1.5 1.5] does. Is this where I could set the thresholds?
set(h2,'linestyle','none','Tag','HatchingRegion','fill','off');
hp = findobj(h2,'Tag','HatchingRegion');
hh = hatchfill2(hp,'cross','LineWidth',1,'Fill','off');
[~, hContour]=contourf(xll, yll, concTotal, levels, 'linecolor', 'none'); % this is the already plotted contour
colormap
colorbar
Thanks in advance for some help.

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