[PD] Ray casting

[baptiste chatel]

I took this particular road only to have a gui to draw in. This was an
interactive musical project, where people equipped with a smartphone would
trigger different sounds or events by visiting a city. The patch i've sent
could be easily reduced to a single object taking the polygon's points
coordinates and a position, only telling if the point is inside the polygon
or not.

2017-04-20 12:53 GMT+02:00 patrice colet <colet.patrice at free.fr>:

>  If it's about mouse binding in [gemwin], the math is really heavy,
> particulary if the camera is moving.
>
>  It can be solved differently by rendering the polygons in an hidden frame
> or another gemwin, and set a different color for each new polygon, the
> binding will be about detecting color under mouse cursor with the help of
> [pix_snap] and [pix_data] and it will work even if the camera is moving.
>
>
> Le 20/04/2017 à 12:26, baptiste chatel a écrit :
>
>> I think so for point in polygon, see attached. It's an old attempt of
>> mine, with a mechanism to draw polygons in Gem and then tell in which
>> polygon your mouse pointer is.
>>
>> 2017-04-20 9:13 GMT+02:00 Max <abonnements at revolwear.com <mailto:
>> abonnements at revolwear.com>>:
>>
>>     Did someone here solve this in Pd before?
>>
>>     https://en.wikipedia.org/wiki/Point_in_polygon
>>     <https://en.wikipedia.org/wiki/Point_in_polygon>
>>     https://rosettacode.org/wiki/Ray-casting_algorithm
>>     <https://rosettacode.org/wiki/Ray-casting_algorithm>
>>
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