I have solved the set {x,y : f(x,y) = 0}, where the solution is complicated to get (many).

**How I want to proceed :**

So I have gotten an idea to make a grid : Divide the abscissa x and ordinate y.

Then for every x,y, I calculate f(x,y).

I obtain a 2 dimensions table.

**What I want to plot and question :**

I want to plot the solution like a heatmap : A yellow region where f(x,y)=0 and a white one where f(x,y)!=0.

Is it possible to do it with qcustomplot ?