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Dark GDK .NET / Math Formula

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Huntinator
14
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Joined: 21st Dec 2009
Location: Channel 57
Posted: 17th Apr 2010 19:06
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Hey I've started a new project which requires me to be able to move an object based on its angles and distance it needs to move, something similar to the Move Command(Which I can't use in this project.). I was wondering if anyone knows how to do that? I'm pretty sure you use Sine, Cosine, and tangent but i'm not sure how.
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veltro
User Banned
Posted: 19th Apr 2010 10:43
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Starting point x0,y0
Distance D
Angle A

Target point

x1 = x0 + D * cos(A)
y1 = y0 + D * sin(A)
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Huntinator
14
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Joined: 21st Dec 2009
Location: Channel 57
Posted: 24th Apr 2010 00:33
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What about the z-axis?
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Matty H
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Joined: 7th Oct 2008
Location: England
Posted: 24th Apr 2010 01:18
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Quote: "(Which I can't use in this project) "


Why not?
Going into the third dimension may throw up a world of trouble, matrices, quaternions etc.., sorry I can't help.

fulcrum physics - free collision/physics plug-in for DarkGDK
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Sven B
19
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Joined: 5th Jan 2005
Location: Belgium
Posted: 24th Apr 2010 12:51
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A simple "orbit" calculation would be

X = centerX + radius*cos(angleY)*cos(angleX)
Y = centerY + radius*sin(angleX)
Z = centerZ + radius*sin(angleY)*cos(angleX)

where
(centerX, centerY, centerZ) is the starting point
radius is the distance
(angleX, angleY) are the angles that will determine the position on the sphere.

They are called sphere coördinates (you can wiki it for more information), though they'll probably use the starting point as the origin.

Cheers!
Sven B

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Huntinator
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Joined: 21st Dec 2009
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Posted: 25th Apr 2010 06:37
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Thanks it worked perfedtly.
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