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Two holes are required because triangulator needs a pointer to the end
of data. If I strip that last one '7' and use vertex count I will be
forced to allocate new buffer for hole indices, copy it's content and
apply 7 at the end. I tried to avoid dynamic allocations in
triangulator as much as possible.
As I mentioned earlier, better name for an array is 'splits' instead of 'holes'.
On 27 April 2012 00:35, Elias Pschernig <elias.pschernig@xxxxxxxxxx> wrote:
> On Thu, 26 Apr 2012 23:53:43 +0200
> Evert Glebbeek <eglebbk@xxxxxxxxxx> wrote:
>
>> Would it be possible for someone to document
>> al_draw_filled_polygon_with_holes and relatives? It's not obvious to
>> me how to use them and I can't work it out from the code.
>>
>
> I found an example, I can try document off that maybe:
>
> float xy[] = {
> 0, 0,
> 0, 100,
> 100, 100,
> 100, 0,
>
> 10, 10,
> 90, 10,
> 50, 90};
> int holes[] = {4, 7};
> al_draw_filled_polygon_with_holes(xy, 7, holes, 2, color)
>
> Basically the first 4 xy pairs are a polygon (it can be non-convex).
> Then follows another 3 xy pairs denoting a hole. The holes array
> specifies the index positions where vertices change direction. So
> index 4 is the start of a hole. I never tried more than one hole but
> without that 7 it didn't work.
>
>
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