How do I set Transparency of area plot in R2014b?

Question

Julia 2014-12-27

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https://ww2.mathworks.cn/matlabcentral/answers/168264-how-do-i-set-transparency-of-area-plot-in-r2014b

编辑： Jacob D 2015-8-28

Hi! I've recently migrated to R2014b and I'm having troubles setting the transparency value of an area plot which worked fine before.

Time = [1:1:10];
y = Time;
recess = [2,0; 2,1; 4,1; 4,0; 6,0; 6,1; 8,1; 8,0]
[AX, LINE1, AREA]= plotyy(Time,y,recess(:,1),recess(:,2),@plot,@area);
  %set properties of lines and area
  set(LINE1,'Linewidth',2)
  set(AREA,'EdgeColor', 'none'); % make area's edge invisible
  set(get(AREA, 'Children'), 'FaceAlpha', 0.3);  %here is the problem - I cannot use FaceAlpha in the same way as before anymore

Please let me know if you have an idea how to circumvent this problem. I'm grateful for any advice. Thank you!!

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Answer 1

Jacob D 2015-8-28

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https://ww2.mathworks.cn/matlabcentral/answers/168264-how-do-i-set-transparency-of-area-plot-in-r2014b#answer_190627

编辑：Jacob D 2015-8-28

在 MATLAB Online 中打开

Here is a solution to your problem. It allows transparent area plots in R2014b and newer. =] I only replaced your last line of code with the last three lines shown here:

Time = [1:1:10];
y = Time;
recess = [2,0; 2,1; 4,1; 4,0; 6,0; 6,1; 8,1; 8,0]
[AX, LINE1, AREA]= plotyy(Time,y,recess(:,1),recess(:,2),@plot,@area);
  %set properties of lines and area
  set(LINE1,'Linewidth',2)
  set(AREA,'EdgeColor', 'none'); % make area's edge invisible
  % Make area transparent
  drawnow; pause(0.05);  % This needs to be done for transparency to work
  AREA.Face.ColorType = 'truecoloralpha';
  AREA.Face.ColorData(4) = 255 * 0.3; % Your alpha value is the 0.3