2017-07-20 10:23 GMT+02:00 Jean-Michaël Celerier <[email protected]>: > You can just compute the sine directly : > > for(int i = 0; i < width; i++) > { > int x = i; > int y = height / 2 + amplitude * std::sin(2 * M_PI * freq * i / width + > phase); > path.lineTo(x, y); > }
I think he wanted to avoid an approximation with straight lines and use cubic beziers. Jean-Michaël: There seems to be many pages explaining the theory behind sine approximation using Beziers if you Google. Elvis > > > > > > ------- > Jean-Michaël Celerier > http://www.jcelerier.name > > On Thu, Jul 20, 2017 at 9:47 AM, Patrick Stinson <[email protected]> > wrote: >> >> Hello! I want to figure out how to draw a sin wave between two QPointF’s >> using QPainterPath. Calculating the cubic control points seems like the best >> way, but I am far from mastering that theory. >> >> This is a diagramming app and the goal is to get a squiggly line between >> two objects. >> >> Thanks! >> _______________________________________________ >> Interest mailing list >> [email protected] >> http://lists.qt-project.org/mailman/listinfo/interest >> > > > _______________________________________________ > Interest mailing list > [email protected] > http://lists.qt-project.org/mailman/listinfo/interest > _______________________________________________ Interest mailing list [email protected] http://lists.qt-project.org/mailman/listinfo/interest
