No way to plot correctly dashed and dotted lines using painters

Question

Rodrigo 2023-1-27

2
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1901975-no-way-to-plot-correctly-dashed-and-dotted-lines-using-painters

编辑： Rodrigo 2023-2-23

I know this is an old issue, and believe me, I've been trying all found "solutions" all the week long. None has really worked. Here's an examplary code of 4 responses for underdamped systems used in Matlab 2019a:

K = 2;

w01 = 1;

w02 = 2;

Zeta1 = 0.3;

Zeta2 = 0.7;

t = 0:0.1:15;

s = tf('s');

P1 = K*w01^2/(s^2 +2*Zeta1*w01*s +w01^2);

P2 = K*w01^2/(s^2 +2*Zeta2*w01*s +w01^2);

P3 = K*w02^2/(s^2 +2*Zeta1*w02*s +w02^2);

P4 = K*w02^2/(s^2 +2*Zeta2*w02*s +w02^2);

f = figure;

f.Position = [100 100 700 375];

p = stepplot(P1,'k-',P2,'k--',P3,'k:',P4,'k-.',t)

p = resppack.timeplot

grid

set(findall(gcf,'type','line'),'linewidth',1);

set(gcf, 'Renderer', 'painters');

p.AxesGrid.XUnits = '';

legend('$\zeta = 0,3$ ; $\omega_0 = 1$','$\zeta = 0,7$ ; $\omega_0 = 1$','$\zeta = 0,3$ ; $\omega_0 = 2$','$\zeta = 0,7$ ; $\omega_0 = 2$','interpreter','latex')

xlabel('Time (s)')

ylabel('Amplitude')

title('')

Guess what? I want it for a publication, i.e., it must be vectorial.

I tried all possible solutions inside Matlab figure (save as, export, changed parameters...). Also tried export_fig and matlabfrag -- which are very good tools, I admit. They just didn't solve the issue.

export_fig seems to have more options, so I'll detail a bit more what happens with it. Using the code above all the lines seems solid after some time. If I change from 'painters' to 'openGL', then the lines appear the way it should be. However, in this case there's no sense to use export_fig using 'painters' again (and obviously, it doesn't work either). Saving as .png with 'screen' resolution is not an option.

Tired of trying with vectorials, I gave up and decided to use .png with higher resolution (600 dpi) both inside the figure environment and also using export_fig. Yes, it seems to work, but the spaces and lengths of dashes changed too! And the lines in the legend look horrible, mainly the dotted.

I just wanted a vectorial figure in the way it pops up to me when it opens. Am I asking too much?

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Rodrigo 2023-1-27

移动：Adam Danz 2023-1-29

Just tried in MATLAB Online. Same problem as previous. If I use painters, the figure is already with wrong dashes, and the exportgraphics doesn't change a thing. If I use openGL, the figure opens ok in MATLAB. But when using exportgraphics the issue happens again in the .pdf file.

Adam Danz 2023-1-30

I ran the code in your question to produce the plot. This helps us see the problem you mentioned in the comment above regarding dashed lines. I was able to reproduce the bug in MATLAB Online and reported the issue. I'll add an answer shortly to share a workaround.

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Answer 1

Adam Danz 2023-1-30

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1901975-no-way-to-plot-correctly-dashed-and-dotted-lines-using-painters#answer_1159090

编辑：Adam Danz 2023-2-23

在 MATLAB Online 中打开

test.pdf

Thanks for reporting this issue. Here's a workaround I came up with after some trial and error.

After running the code from your question, move the curves to a new figure, set the decorations and the renderer, then export. I tested this in R2019a and MATLAB Online. The resultant pdf is attached and a screenshot of the vectorized pdf is below (the screenshot, of course, is not vectorized). Check that your legend strings are in the correct order after copying!

h = findall(f,'type','line');
iscurve = strcmpi({h.Tag},'Curves');
newfig = figure; 
newax = axes(newfig); 
hold on
newh = copyobj(h(iscurve),newax);
box on
grid on
legend('$\zeta = 0,3$ ; $\omega_0 = 1$','$\zeta = 0,7$ ; $\omega_0 = 1$','$\zeta = 0,3$ ; $\omega_0 = 2$','$\zeta = 0,7$ ; $\omega_0 = 2$','interpreter','latex')
xlabel('Time (s)')
ylabel('Amplitude')
set(newfig, 'Renderer', 'painters') % not needed in recent releases; after legend
% Export
print('test.pdf','-dpdf')

Update: easier workaround

Alternatively, you can merely remove the z-data from all lines to solve this problem. Thanks again for reporting it.

% f is the original figure handle to the stepplot
h = findall(f,'type','line');
set(h, 'ZData', [])

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Rodrigo 2023-1-30

编辑：Rodrigo 2023-2-23

Incredible, worked like a charm! I can't understand why you need another figure for that, but in the end it doesn't matter. I must congratulate you, Adam! You really solved an old issue that very few people did.

Update:

And it's now even better with Adam's update. Thanks again!

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