Why does plot quality reduce when plotting line and scatter together?

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atharva aalok 2022-1-24

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回答： Bjorn Gustavsson 2022-1-24

I am using plot3() and scatter3() together and the quality of the plot is reducing. The plot becomes a bit pixelated.

% Code snippets of what I am using
plot3(xSol{1}(first_seconds), omegaSol{1}(first_seconds), ESol{1}(first_seconds), 'LineWidth', 1.8, 'Color', PS.Purple2);
scatter3(x_FP(1, i), omega_FP(1, i), E_FP(1, i), 'Marker', 'o', 'SizeData', 60, 'MarkerFaceColor', PS.DRed2, 'MarkerEdgeColor', PS.Red4, 'MarkerFaceAlpha', MarkerAlpha);

Why is this happening? How can I get a smooth and high quality plot?

Problem picture:

Basically I want to have the dots with a certain alpha. plot3() does not allow that so I am using scatter3(). If there is another way of using 'o' Marker with plot3() and get alpha for them I can use that.

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atharva aalok 2022-1-24

编辑：atharva aalok 2022-1-24

在 MATLAB Online 中打开

datafile.mat

load('datafile.mat');

figure(2);

fig2_comps.fig = gcf;

%=================================================

% PLOT TIME SERIES

time_limit = 50;

upper_time_limit = 90;

first_seconds = tSol{1} < time_limit;

after_first_seconds = (tSol{1} > time_limit) & (tSol{1} < upper_time_limit);

% figure(1);

fig2_comps.p1 = plot3(xSol{1}(1), omegaSol{1}(1), ESol{1}(1), 'HandleVisibility', 'off', 'LineStyle', 'none', 'LineWidth', 1.5, 'Marker', 'o', 'MarkerSize', 6, 'MarkerFaceColor', PS.DBlue1, 'MarkerEdgeColor', PS.Purple2);

hold on

fig2_comps.p2 = plot3(xSol{1}(first_seconds), omegaSol{1}(first_seconds), ESol{1}(first_seconds), 'LineWidth', 1.8, 'Color', PS.Purple2);

fig2_comps.p3 = plot3(xSol{1}(after_first_seconds), omegaSol{1}(after_first_seconds), ESol{1}(after_first_seconds), 'LineWidth', 1.5, 'Color', PS.Green1);

grid on

MarkerAlpha_list = linspace(1, 0.2, length(x_FP(1, :)));

for i = 1:length(x_FP(1, :))

MarkerAlpha = MarkerAlpha_list(i);

fig2_comps.p4 = scatter3(x_FP(1, i), omega_FP(1, i), E_FP(1, i), 'HandleVisibility', 'off', 'Marker', 'o', 'SizeData', 60, 'MarkerFaceColor', PS.DRed2, 'MarkerEdgeColor', PS.Red4, 'MarkerFaceAlpha', MarkerAlpha);

fig2_comps.p5 = scatter3(x_FP(2, i), omega_FP(2, i), E_FP(2, i), 'HandleVisibility', 'off', 'Marker', 'o', 'SizeData', 60, 'MarkerFaceColor', PS.DBlue2, 'MarkerEdgeColor', PS.Blue4, 'MarkerFaceAlpha', MarkerAlpha);

end

legend('location', 'northwest');

atharva aalok 2022-1-24

For some reason this pixelation is only happening when displaying.

When I save the figure with 600dpi no pixelation happens.

KALYAN ACHARJYA 2022-1-24

OK

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Answer 1

Bjorn Gustavsson 2022-1-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1634945-why-does-plot-quality-reduce-when-plotting-line-and-scatter-together#answer_880730

The painters-renderer that produces vector-format output, like eps doesn't understand alpha-type transparency. Therefore when you have plots utilizing alpha-mapped transparent objects you will get figures saved with the opengl renderer - which understands transparency but produces pixel-based images. There is (as far as I know) nothing much we can do about that.

Hope this clarifies the issue.

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