How do you plot points in QT?

Question

I am writing an application in C++ with QT where you have n points and compute the convex hull of this. However, once this is computed I have no idea how to plot the points and

Answer 1

You can just create a custom class deriving from QWidget where you override the void paintEvent(QPaintEvent* event) method. In that you put the points into some sort of point list, either std::vector or QList and then paint it with a Polyline method. For instance:

void Foo::paintEvent(QPaintEvent* event)
{
  QPainter painter(this);
  std::vector points;
  // Fill points with the points
  painter.drawPolyLine(points.data(), static_cast(points.size()));
}