How to use scatter with transparent dots?

Question

Mr M. 2018-10-9

1
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/422964-how-to-use-scatter-with-transparent-dots

评论： Benjamin 2024-1-29

采纳的回答： Adam Danz

facealpha is not working for me

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KSSV 2018-10-9

Show the code..which you tried.

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Answer 1

Adam Danz 2018-10-9

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/422964-how-to-use-scatter-with-transparent-dots#answer_340502

编辑：Adam Danz 2022-6-14

MarkerFaceAlpha and MarkerEdgeAlpha are what you're looking for. Check out this example.

https://www.mathworks.com/examples/matlab/mw/graphics-ex36949892-create-scatter-chart-with-transparency

[from the link]

x = [5 10 11 13 18];

y1 = [40 80 150 80 50];

a1 = 100*[100 50 80 30 50];

scatter(x,y1,a1,'MarkerFaceColor','b','MarkerEdgeColor','b',...

'MarkerFaceAlpha',.2,'MarkerEdgeAlpha',.2)

axis([0 20 0 200])

x = [2 6 8 11 13];

y2 = [30 40 100 60 140];

a2 = 100*[30 50 30 80 80];

hold on

scatter(x,y2,a2,'MarkerFaceColor','r','MarkerEdgeColor','r',...

'MarkerFaceAlpha',.2,'MarkerEdgeAlpha',.2)

hold off

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Craig Puetz 2021-6-30

编辑：Image Analyst 2022-6-14

I am trying this with v2020b and it simply doesn't work - no combination of parameters makes the markers transparent.

Goal:

1) Plot a group of points on a geoaxis with a 3rd dataset that varies in color: Working

2) Plot two additional groups of points with the areas covered in a lightly tinted "blob": Not working, blob is full intensity, not transparent

Code:

f1 = figure(1);
clf;
gx1 = geoaxes;
geobasemap satellite
hold on
std_scaled = paawDF.std_Alt/(max(paawDF.std_Alt)-min(paawDF.std_Alt));
h1 = scatter(gx1,paawDF.lat_dd,paawDF.lon_dd,20,std_scaled,"filled");
h2 = scatter(gx1,decBigData.Latitude(taFilter),decBigData.Longitude(taFilter),5,"filled", ...
    "Marker", 'o', ...
    "MarkerFaceColor", [0 1 0],"MarkerEdgeColor",'none', ...
    "MarkerFaceAlpha", .3, "MarkerEdgeAlpha", .3);
% param
% set(h2.MarkerHandle, 'FaceColorType','truecoloralpha', 'FaceColorData',uint8([0;200;0; 50]));
% h2 = plot(gx1,decBigData.Latitude(taFilter),decBigData.Longitude(taFilter),'o','Color',[0 1 0 0.2]);
h3 = plot(gx1,decBigDataWheel.Latitude(taFilterWheel),decBigDataWheel.Longitude(taFilterWheel),'.r');
% h2.MarkerFaceAlpha = .2;
% h2.MarkerEdgeAlpha = .2;
% h3.MarkerFaceAlpha = .2;
% h3.MarkerEdgeAlpha = .2;

Obviously, I have not run all of these settings at the same time, those commented out are other things I have tried.

All comments are welcome!

Damon Bradley 2023-4-12

Depends on the marker you use. If you use a dot '.', you will not see any result. With other markers, you will. I've done this on R2020a though, so please double-check with your rev. Good luck!

Benjamin 2024-1-29