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

[Xavier C. <car...@gm...>]

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...>
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 :
>
>
> [image: 20200116_160142.png]
>
> But sometimes, ( seems random ) this happens :
>
>
> [image: 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);
>