User interface problem -- check a point is inside a polygon or not

This is a discussion on User interface problem -- check a point is inside a polygon or not within the C Programming forums, part of the General Programming Boards category; Hello everyone, I have a UI application and I need to display context menu according to whether user clicks inside ...

  1. #1
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    User interface problem -- check a point is inside a polygon or not

    Hello everyone,


    I have a UI application and I need to display context menu according to whether user clicks inside a polygon or not. So, I think I need to use some algorithms which can check whether a point is inside a polygon.

    Does anyone have any ideas or reference materials?


    thanks in advance,
    George

  2. #2
    ATH0 quzah's Avatar
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    Something tells me you didn't search for anything on the topic.


    Quzah.
    Hope is the first step on the road to disappointment.

  3. #3
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    Hi quzah,


    Quote Originally Posted by quzah
    Something tells me you didn't search for anything on the topic.


    Quzah.
    I have searched but have not found anything useful. I searched "point inside polygon algorithm". Could you help please?


    regards,
    George

  4. #4
    Awesomefaceradcore bivhitscar's Avatar
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    Psst, he gave you the link.
    it's ironic considerate rarity patron of love higher knowledge engulfs me...

  5. #5
    and the hat of wrongness Salem's Avatar
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    > I have searched but have not found anything useful. I searched "point inside polygon algorithm". Could you help please?
    Give up trying to be a programmer would be my suggestion.
    If you can't click on a link, scroll down to where the source code is listed, and use it, then there really is no help for you.

    If you want better help, then your question needs to be a hell of a lot more specific than it is at the moment.
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  6. #6
    ATH0 quzah's Avatar
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    Quote Originally Posted by George2
    Hi quzah,

    I have searched but have not found anything useful. I searched "point inside polygon algorithm". Could you help please?


    regards,
    George
    Well George, you're either stupid, or a liar. Here is one search engine's results for your exact keywords. Here is another search engine's.

    Also, there's been at least one other thread in recent memory on this very forum, for the same concept / topic.

    You need to learn how to make an effort. You do know that you're allowed to try more than one combination or variation of keywords in a search engine. Search engine's aren't like parachuting. If you ........ up, you can try again.


    Quzah.
    Hope is the first step on the road to disappointment.

  7. #7
    Awesomefaceradcore bivhitscar's Avatar
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    >You do know that you're allowed to try more than one combination or variation of keywords in a search engine.

    Really, I thought they just knew what I was talking about?
    it's ironic considerate rarity patron of love higher knowledge engulfs me...

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