On 07/03/2010 12:19 PM, Taco Hoekwater wrote:
> On 07/03/2010 10:03 AM, Taco Hoekwater wrote:
>>
>>> If this is too complicated, it might help if I can find out if a given
>>> point lies inside a given cycled path.
>>
>> Even this is fairly tricky. Some important questions are:
>
> I thought this was a neat thing to try to write a macro for. Attached
> is a test file that defines a macro inside() that takes two arguments:
> a point and a cyclic path. It returns true if the point lies inside
> that path, in most cases. There are lots of problems with it;
> what happens to a point actually on the curve is basically undefined,
> and self-intersects sometimes make it fail in interesting ways.

Here is a somewhat smarter version of the same macro. This one
seems ok at first glance (extensive testing will probably show
border cases that are not covered).

Best wishes,
Taco