20 Aug 2007

Asymptote using geometry.asy – fig0410

Figure 0041
(Compiled with Asymptote version 2.14svn-r5318)
    
import geometry;
size(10cm);

// currentcoordsys=cartesiansystem((2,1),i=(1,0.5),j=(-0.25,.75));
// show(currentcoordsys);

point A=(-1,-1);
point B=(2,1);
dot("$A$",A,S,red);
dot("$B$",B,NW,red);

line l=line(A,B,false);
line ll=hline()+0.5*B;
draw(l^^ll);
draw(complementary(l),dashed+grey);

point F=(2,-1.5);
dot("$F$",F,N);

parabola p=parabola(F,0.2,110);
draw(p);

dotfactor*=2;

/* View the definition of point[] intersectionpoints(line,parabola) */
dot(intersectionpoints(l,p), red);
dot(intersectionpoints(ll,p), red);

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