All, I am wondering why my dots are not filled with the drawdot command. \startuseMPgraphic{yeqx2} %define function vardef f(expr x)= x*x enddef; %define clipping path path cpath; cpath:=(-5,-5)--(5,-5)--(5,5)--(-5,5)--cycle; %create function path path p; p:=(-5,f(-5)); for x=-5 step .1 until 5: p:=p--(x,f(x)); endfor; p:=p--(5,f(5)); %clip function path to clipping path p:=p cutbefore cpath; p:=reverse p; p:=p cutbefore cpath; %initialize scale numeric u; 10u=2in; %draw the grid for k=-5u step 1u until 5u: draw (k,-5u)--(k,5u) withcolor 0.85white; draw (-5u,k)--(5u,k) withcolor 0.85white; endfor; %draw axes drawdblarrow (-5.2u,0)--(5.2u,0); drawdblarrow (0,-5.2u)--(0,5.2u); %label axes label.rt(btex $x$ etex, (5.2u,0)); label.top(btex $y$ etex, (0,5.2u)); label.bot(btex $5$ etex, (5u,0)); label.lft(btex $5$ etex, (0,5u)); %scale function path p:=p scaled u; %draw function path drawdblarrow p withcolor blue; %draw plotted points for x=-2 step 1 until 2: drawdot ((x,f(x)) scaled u) withpen pencircle scaled 4pt; endfor; \stopuseMPgraphic \placefigure{The simple parabola.}{\useMPgraphic{yeqx2}}