Re: [Plplot-general] drawing boxes, keeps on painting ?

[Hazen B. <hba...@ma...>]

Maybe the problem is that you are using "vecsize" instead of "5" in the
call to p.line()?

p.line(vecsize,px,py);
versus
p.line(5,px,py);

I'm guessing that vecsize is not always equal to 5. However it would
help if you show all the code, and also the working Python version for
comparison.

best,
-Hazen

On 1/21/20 1:38 PM, Xavier Cardil wrote:
> Hi, any comment on this ? I really can't find the reason lines seem to
> get off viewport box randomly, even after several tries refactoring this
> function ... any help would be appreciated !
> 
> On Thu, Jan 16, 2020 at 4:04 PM Xavier Cardil <car...@gm...
> <mailto:car...@gm...>> wrote:
> 
>     Hi, I am trying to draw boxes following example 32
>     <http://plplot.sourceforge.net/examples.php?demo=32&lbind=C++>. I
>     successfully implemented this on Python, but there is some weird
>     problem when trying to do it on C++:
> 
>     Sometimes, boxes are drawn correctly :
> 
> 
>     20200116_160142.png
> 
>     But sometimes, ( seems random ) this happens :
> 
> 
>     20200116_155042.png
> 
>     Is this something I am missing ? I can't figure out why is this
>     happening?
> 
>     Below is my code, which is really simple. Thanks
> 
> 
>     plstream p;
> 
>     const auto hmax = max_element(begin(vec.high), end(vec.high));
>     const auto lmin = min_element(begin(vec.low), end(vec.low));
> 
>     vector<int> ivec(vecsize);
> 
>     generate(ivec.begin(), ivec.end(), [steps = 0]() mutable { return
>     steps++; });
>     const char *device = "xwin";
>     p.start(device, 1, 1);
>     p.ssub(0, 1);
>     p.env(0, vecsize, *lmin, *hmax, 0, 0);
> 
>     PLFLT px[5], py[5];
>     PLFLT wx[5], wy[5];
>     PLFLT spacing;
>     PLFLT xmid;
> 
>     spacing = .4;// in x axis units
> 
>     for (int i = 0; i < vecsize; i++) {
>     px[0]=ivec[i]+spacing /2.;
>     py[0]=vec.open[i];
>     px[1]=ivec[i]+spacing /2.;
>     py[1]=vec.close[i];
>     px[2]=ivec[i]+1.-spacing /2.;
>     py[2]=vec.close[i];
>     px[3]=ivec[i]+1.-spacing /2.;
>     py[3]=vec.open[i];
>     px[4]=ivec[i]+spacing /2.;
>     py[4]=vec.open[i];
> 
>     p.col0(1);
>     p.line(vecsize,px,py);
> 
> 
> 
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