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DarkBASIC Professional Discussion / trig question

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bitJericho
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Joined: 9th Oct 2002
Location: United States
Posted: 9th Apr 2008 10:40
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I'm terrible at trig, so here's what I'm trying to do. I need to know the angle to a point in space, from another point in space. I have, say, the following points:

oldPosX
oldPosZ
posX
posZ

distance = SQRT((posX-oldPosX)^2+(posZ-oldPosZ)^2)

What's the angle from coordinates 1 to coordinates 2 in relative space?

Much appreciated!


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Chris K
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Joined: 7th Oct 2003
Location: Lake Hylia
Posted: 9th Apr 2008 10:43
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If you want the angle measure anticlockwise from the x axis, it's:

Theta# = atan( ( posZ# - oldPosZ# ) / ( posX# - oldPosX# ) )

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bitJericho
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Posted: 9th Apr 2008 11:07
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wonderful! Thanks!


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Diggsey
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Posted: 9th Apr 2008 15:04 Edited at: 9th Apr 2008 15:04
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Don't use that It will only work for angles 0 to 90! Use this:

Angle# = atanfull(posX# - oldPosX#, posZ# - oldPosZ#)

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bitJericho
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Posted: 9th Apr 2008 20:36
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Quote: "Don't use that It will only work for angles 0 to 90! Use this:

Angle# = atanfull(posX# - oldPosX#, posZ# - oldPosZ#)"


Ah ok. I realized it was a little off, and that's when I discovered atanfull and already have it in effect


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