[Scilab-users] Finding data_bounds

[Antoine Monmayrant]

Le 03/22/2016 11:39 AM, Jens a écrit :
> xdel();
>      figure('BackgroundColor',[1 1 1]);
>      f1=gcf();  f1.figure_size=[1000 900];  f1.figure_position = [300,0];
>                
>      subplot(2,3,1)//setting estimated plot bounds to maintain during loop
>      cafix=gca();
>      cafix.data_bounds = 5*[-1,-1;1,1];// estimated values before calculation
>      cafix.tight_limits="on";
>      cafix.auto_scale="off";
>      
>      
>      x=linspace(-5,5,10);//calculate and plot
>      for i=1:5
>          subplot(2,3,1)
>          plot(cafix,x,i*x/2)
>          //further calculations and subplots here
>          subplot(2,3,1)
>          plot(cafix,x,i*x/2,'-o')
>          //further calculations and subplots here
>          subplot(2,3,1)
>          plot(cafix,x,i*x/2,'-+')
>      end//for ...
>      sleep(2000)
>      //Now Scilab knows the extremal values which should become visible too
> now if cropped.
>      subplot(2,3,1)
>      cafix.isoview="on";
>      cafix.axes_bounds = [0,0,0.4,0.4];
>      cafix.data_bounds = 13*[-1,-1;1,1];//These bounds are set by inspection
>      //How can adequate data_bounds be extracted from the graphic object?
Just add the following at the end of your script:

     nplot=length(cafix.children);
     xs=[];
     ys=[];
     for i=1:nplot
         xs=[xs;cafix.children(i).children.data(:,1)];
         ys=[ys;cafix.children(i).children.data(:,2)];
     end

     xmin=min(xs);
     xmax=max(xs);
     ymin=min(ys);
     ymax=max(ys);
     cafix.data_bounds=[xmin,xmax,ymin,ymax]


By the way, is there any reason to overlap several plots instead of 
adding new points in the previous one?
This would be more efficient:
cafix.children(1).children.data=[cafix.children(1).children.data;[new_xs,new_ys]];
     cafix.tight_limits="on";

Cheers,

Antoine