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DarkBASIC Professional Discussion / Problem Math !

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Guido Italy
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Posted: 5th Jun 2010 16:37
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look my image :


I have an isosceles triangle . (ray) + D from x1,y1 to x2,y2)

I know the length of three sides .

I know x1,y1 and x2,y2 .

what is alpha in degrees ??

Thank !
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Sven B
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Posted: 5th Jun 2010 16:48
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As I see it, you have several options:

Using the dot product
angle = Bgcos( ((x1 - cx) * (x2 - cx) + (y1 - cy) * (y2 - cy)) / (R*R) )
if you have the coordinates of that center point

If not, you can use
angle = 2.0 * Bgsin( (D/2.0) / R )

Cheers!
Sven B

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Guido Italy
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Posted: 5th Jun 2010 21:27
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Thank !!!!!

yes i've coordinnates of center point .

but Bgcos what is ?

in DbPro is Acos() ?
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Sven B
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Posted: 5th Jun 2010 21:49
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Oh yeah sorry, it's acos().

I was thinking in dutch ^^ Bgcos() = Acos() and Bgsin() = Asin().

Cheers!
Sven B

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Guido Italy
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Posted: 5th Jun 2010 22:10
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Thank !
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Guido Italy
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Posted: 6th Jun 2010 13:44
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i have to draw an Arc of circumference .

I kinow :

x1,y1 - x2,y2 - xc.yc and the ray ...

but when drawing the Arc with dots,
i've needed the points are at a certain DISTANCE from each other

DISTANCE from dot to dot = Precision#

please write me a function .. (!)
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Guido Italy
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Posted: 6th Jun 2010 15:20
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Sorry i start new topic ..
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