Why is the rectangle command so much slower on the new graphics engine?

Question

Johannes Korsawe 2016-4-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/281467-why-is-the-rectangle-command-so-much-slower-on-the-new-graphics-engine

回答： Walter Roberson 2016-4-28

Hi folks,

i am just comparing the performance in plotting a lot of filled circles via the rectangle command. My benchmark is Release 2010b and i want to switch to Release 2015b.

I could not believe that i found 2015b being 5 times slower! Same machine, same renderer. (Doesn't depend on the renderer, though.)

Here is my example code including time measurement.

z=0;
for exp=1:0.2:5,
  n=round(10^exp);cntr=rand(n,2);rad=rand(n,1);z=z+1;figure;hold on;set(gcf,'Renderer','opengl');
  t1=clock;
  for i=1:n,
    h=rectangle('Position',[cntr(i,1)-rad(i),cntr(i,2)-rad(i),2*rad(i),2*rad(i)],'Curvature',[1,1],'FaceColor','b','EdgeColor','none');
  end
  t2=clock;result(z)=etime(t2,t1);nn(z)=n;delete(gcf);
end