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

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

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);