Computer Science Canada

Angle of a line...

Author:	Homer_simpson [ Tue Jul 01, 2003 5:24 pm ]
Post subject:	Angle of a line...
how do i calculate angle A knowing that line1 is always horizontal and having the coordinates of line2... i know it has to be done using Sine and Cosine but i dont exactly know how.... Haven't had math in while so i've forgotten a few stuff... =/

Author:	Catalyst [ Tue Jul 01, 2003 5:40 pm ]
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SOH CAH TOA sin=op/hyp your hyp is the distance from point1 to point2 since line 2 is always horizontal that distance is y2-y1 angle=sin-1((y2-y1)/distance (p1,p2))

Author:	Andy [ Tue Jul 01, 2003 5:40 pm ]
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since tan of an angle is the oposite side over the adjancent side, you simply set up an equation of tan(x)=10/20 tan(x)=1/2 then u juss do tan inverse and you get 45 degrees

Author:	SilverSprite [ Tue Jul 01, 2003 6:07 pm ]
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yepyep just something to add.. since tan is opposite side over adjacent side.. that means that it is simply the slope of the line meaning that tanA where A is the required angle is equal to the slope of the line.. so A = arctand(slope of line)

Author:	Homer_simpson [ Tue Jul 01, 2003 6:44 pm ]
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hmmm.... got it!!! thx... here's another question how do i caculate tangent (a) in Turing?

Author:	Andy [ Tue Jul 01, 2003 6:53 pm ]
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there is no tangent in turing, but since tan(A)=sin(A)/cos(A) just substitute it

Author:

Homer_simpson [ Tue Jul 01, 2003 6:58 pm ]

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no it's not i thought of that and i tried it b4 it doesn't work !!! =(
Edit:oh wait nvm i used cos instead of cosd now it works...

code:

function tan (r : real) : real
result (sind (r) / cosd (r))
end tan

put tan (1)

how do i do arctan or sine-1? **-1 doesn't work =/

Author:	AsianSensation [ Tue Jul 01, 2003 8:52 pm ]
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funny thing is, the geniuses who made turing(tom) decided not to put a inverse cos and sin function, said it was irrelevant. so the best bet for using inverse tan is to make one urself....

Author:	Catalyst [ Tue Jul 01, 2003 9:09 pm ]
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such an old post (this is also in the help file) http://www.compsci.ca/bbs/viewtopic.php?t=263&highlight=inverse

Author:	AsianSensation [ Tue Jul 01, 2003 9:19 pm ]
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*stick foot in mouth whoa, they had an arctan function? damn.......Im ignorant.......

Author:	Andy [ Tue Jul 01, 2003 9:43 pm ]
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wow that's really cool... make ur own inverse functions

Author:	SilverSprite [ Tue Jul 01, 2003 11:46 pm ]
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its math dodge.. you go to massey you should undetrstand those..

Author:

Homer_simpson [ Wed Jul 02, 2003 12:00 am ]

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i didn't know they had arctan tangent in turing either... in fact that was all that i needed...
so here's how it goes:

code:

View.Set ("offscreenonly")

var x1, x2, y1, y2, b := 0
var slope, ang : real
x1 := 100

y1 := 100

loop
mousewhere (x2, y2, b)
drawline (0, y1, 640, y1, 12)
if not (x2 = x1) then
slope := (y2 - y1) / (x2 - x1)
end if
ang := arctand (slope)
locate (1, 1)
put "coords : ", x1, "/", y1, "/", x2, "/", y2
put "slope : ", slope
put "angle :", ang
drawline (x1, y1, x2, y2, 9)
delay (5)
View.Update
cls
end loop

Author:	Catalyst [ Wed Jul 02, 2003 12:15 am ]
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there some problems there such as the negative angles and the fact and from 180 to 270 show as 0-90

Author:	Homer_simpson [ Wed Jul 02, 2003 12:37 am ]
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lol well yeah... but it is fixable if you try to fix it... i have fixed it and used it in my new particle engine with gravity support which i'll upload in a few minutes...

Author:	Andy [ Wed Jul 02, 2003 9:25 am ]
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SilverSprite wrote: its math dodge.. you go to massey you should undetrstand those.. sorry silversprite that i'm not as smart as you plus i suck at turing, i didn't even know about arctan

Author:	SilverSprite [ Wed Jul 02, 2003 11:13 am ]
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dodge_tomahawk wrote: ... i suck at turing, i didn't even know about arctan omg GEEK

Author:	Andy [ Thu Jul 03, 2003 9:51 am ]
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? how does that work... ur calling me a geek cause i don't spend time programming?

Author:	SilverSprite [ Thu Jul 03, 2003 1:47 pm ]
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nope.. just cuz you find it your duty or a need to memorize all turing commands... like it'll matter

Author:	krishon [ Thu Jul 03, 2003 4:32 pm ]
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lol, silversprite's got a point there

Author:	Andy [ Thu Jul 03, 2003 5:13 pm ]
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no i was simply admitting that i'm not some compsci wiz

Author:	SilverSprite [ Thu Jul 03, 2003 5:31 pm ]
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krishon wrote: lol, silversprite's got a point there thx krishon.. its the truth lol dodge_tomahawk wrote: no i was simply admitting that i'm not some compsci wiz you sure do an excessive amount of compsci.. and your still not a wiz? dodge_tomahawk wrote: ? how does that work... ur calling me a geek cause i don't spend time programming? i'm just playing around with you dodge.. you know me.. dont take it personally jkjkjkJK

Author:	Andy [ Thu Jul 03, 2003 5:39 pm ]
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hey man ever heard of china man dun understand sarcasm?

Author:	SilverSprite [ Thu Jul 03, 2003 5:49 pm ]
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nope and dont care

Author:	Homer_simpson [ Thu Jul 03, 2003 6:03 pm ]
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This discussion is giong off topic and getting stupid again... so just stop here...

Author:	Andy [ Thu Jul 03, 2003 7:01 pm ]
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well we finished answering ur question didn't we?

Author:	Homer_simpson [ Thu Jul 03, 2003 7:36 pm ]
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well then i dont see reason to start a new nonsense discussion and spam the forum...

Author:	JSBN [ Thu Jul 03, 2003 11:58 pm ]
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This reminds me, does any1 still want those trajectory formulas?

Author:	JayLo [ Fri Jul 04, 2003 12:07 am ]
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yes, please.

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