21 Aug 2007

## Asymptote using geometry.asy – fig0650

 (Compiled with Asymptote version 2.14svn-r5318)
```
import geometry;
size(15cm,0);

currentcoordsys=cartesiansystem((0,0),i=(1,0.5),j=(-0.5,.75));
show(currentcoordsys, xpen=invisible);

point A=(4,2);

ellipse el=ellipse(A,3,2,20);
draw(el);
dot("\$C\$",el.C,S,red);

dot("\$F_1\$",el.F1,S);
dot("\$F_2\$",el.F2,S);

///////////////////////////////////////
currentpolarconicroutine=fromCenter;//
/////////////////////////////////////

/* View the definition of point angpoint(explicit ellipse,real,polarconicroutine) */
point P=angpoint(el, 0);
dot("angpoint(el, 0)", P,E);
draw(el.C--P);

point P=angpoint(el, 90);
dot("angpoint(el, 90)", P,NW);
draw(el.C--P);

point P=angpoint(el, 90, fromFocus);
dot("angpoint(el,90,fromFocus)", P,NW);
draw(el.F1--P);

/* View the definition of abscissa angabscissa(real,polarconicroutine) */
dot("angpoint(el, 180)", point(el,angabscissa(180)), W);

dot("angpoint(el, 370)", angpoint(el,370),NE);
dot("angpoint(el, -45)", angpoint(el,-45),SE);

point P=angpoint(el, -45, fromFocus);
dot("angpoint(el,-45,fromFocus)", P,S);
draw(el.F1--P);

```

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