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Topic: Trigonometry... Inverse Cosine? (Read 774 times) |
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aadigi
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Trigonometry... Inverse Cosine?
« on: Apr 2nd, 2004, 7:40pm » |
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My trigonometry skills are pretty shoddy, but I need an invserse cosine function. Is there some kind of roundabout way to build one using the existing Processing trig tools? Any other solutions? Thanks.
-Aaron
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justo
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Re: Trigonometry... Inverse Cosine?
« Reply #1 on: Apr 2nd, 2004, 10:47pm » |
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you can usually rearrange things to use atan or atan2, both of which processing supports, but if all else fails you can just use Math.acos().
edit: my mistake...only processing only has an atan2() method. your best bet would be Math.acos() then.
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| « Last Edit: Apr 2nd, 2004, 10:47pm by justo » |
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aadigi
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Re: Trigonometry... Inverse Cosine?
« Reply #2 on: Apr 2nd, 2004, 11:12pm » |
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Oh hey... thats nice... I didn't realize I automatically had access to the Java Math class. Thanks!
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aadigi
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Re: Trigonometry... Inverse Cosine?
« Reply #3 on: Apr 2nd, 2004, 11:37pm » |
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K... one more problem. The Math.acos() function wants doubles and i'm feeding it floats and getting errors. Processing doesn't seem to have a function to convert variables to doubles. Is there some kind of equivalent avaliable in the Java Math library or something? Thanks.
-Aaron
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fry
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Re: Trigonometry... Inverse Cosine?
« Reply #4 on: Apr 3rd, 2004, 2:00am » |
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it's probably upset that you're getting doubles *back*, not that you're putting them in. it'll upgrade floats to doubles but not the other way 'round. just cast what comes back from acos:
float ac = (float) Math.acos(blah);
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