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function f(x) { y = -3*x*x+2*x+5; return y }
...
// ... with QQ1x,QQ1y, QQ2x,QQ2y very little light red,blue
...
i=0; ii=0
for(j=0;j<3e4;j=j+1) {xp=Math.random()*(bX-aX)+aX; yp=Math.random()*(bY-aY)+aY
                      if(yp > 0 && yp < f(xp)) {QQ2x[i]=xp; QQ2y[i]=yp; i=i+1}
                      if(yp < 0 && yp > f(xp)) {QQ1x[ii]=xp; QQ1y[ii]=yp; ii=ii+1} }