2017-07-20 10:23 GMT+02:00 Jean-Michaël Celerier
<jeanmichael.celer...@gmail.com>:
> 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 <patrickk...@gmail.com>
> 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!
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>
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