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DarkBASIC Discussion / Calculating the area of a circle

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Chessplayer
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Posted: 14th Nov 2003 01:31
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I want to draw a circle, and be able to tell if the mouse ever goes inside it. I can't use just:
'if x > 200 and if x < 400 then mouseinside = 1'
because the circle is different that a box (duh!). I have a sneaking suspision I need to use sine and cosine...

This is still Chessplaer! I just decided to spell my handle correctly!
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Easily Confused
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Posted: 14th Nov 2003 03:07
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Actualy, all you need to do is measure the distance from the center of the circle to the mouse, if this distance is less than the radius of the circle then you're inside it.



...none of that sin and cosine nonsense

Programming anything is an art, and you can't rush art.
Unless your name is Bob Ross, then you can do it in thirty minutes.
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JoelJ
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Posted: 14th Nov 2003 04:16
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and if you wanted to know what the area of a circle is its

pi*r^2

pi = about 3.1415926535897932384626433832795 (seriously)
r = the radius of the circle

Two words, moo.
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Phaelax
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Posted: 14th Nov 2003 06:13
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if ((mousex()-cx)^2 + (mousey()-cy)^2) < radius^2 then mouse in circle
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JoelJ
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Posted: 14th Nov 2003 06:55
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wait. my last post, i think thats the circumfrence(sp?) sorry.

Two words, moo.
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Easily Confused
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Posted: 14th Nov 2003 20:49 Edited at: 14th Nov 2003 20:50
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Actualy you're right:

PI*radius^2 is area.
PI*diameter or 2*PI*radius is the circumference.

Programming anything is an art, and you can't rush art.
Unless your name is Bob Ross, then you can do it in thirty minutes.
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KNau
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Posted: 14th Nov 2003 22:01
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Wow, I don't think I ever heard that you could get the circumfrance from 2*PI*radius, but then I skipped math class all the time (don't think I'm not regretting it now ).

Now is it (2*PI)*radius or 2*(PI*radius)?

http://www.canceriannewmedia.com
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Phaelax
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Posted: 14th Nov 2003 22:10
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Technically, you could calculate PI as well. Equations can be moved around to find the different variables of whatever needs to be known.

So if Area = PI*r^2 then PI = Area/(r^2)
To find the radius, r = sqrt(Area/PI)
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Easily Confused
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Posted: 14th Nov 2003 22:21 Edited at: 14th Nov 2003 22:27
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Quote: "Now is it (2*PI)*radius or 2*(PI*radius)?"


Works either way, brackets are not needed:


Programming anything is an art, and you can't rush art.
Unless your name is Bob Ross, then you can do it in thirty minutes.
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Chessplayer
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Posted: 15th Nov 2003 02:02
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Thx all!

This is still Chessplaer! I just decided to spell my handle correctly!
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Wik
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Posted: 15th Nov 2003 18:55 Edited at: 15th Nov 2003 19:13
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10,000 digits of pi:

http://home.comcast.net/~mharrigan2/pi.txt


I wanted to learn C++ but then I started having nightmares.
I would scream at night, "AHHHHH!!! THE SEMI-COLONS"
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CPU
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Posted: 15th Nov 2003 23:23
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thats so cool!
i have one of my own though it's not on the internet, i made a program that calculated all the prime numbers up to like 20 to 30 billion (i'm not kidding the file is like 17MB) and it locked up the computer for about 10 min.

Sparring - Loved by many, Pefected by few.
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Phaelax
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Posted: 16th Nov 2003 08:39
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PI = 3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647093844609550582231725359408128481117450284102701938521105559644622948954930381964428810975665933446128475648233786783165271201909145648566923460348610454326648213393607260249141273724587006606315588174881520920962829254091715364367892590360011330530548820466521384146951941511609433057270365759591953092186117381932611793105118548074462379962749567351885752724891227938183011949129833673362440656643086021394946395224737190702179860943702770539217176293176752384674818467669405132000568127145263560827785771342757789609173637178721468440901224953430146549585371050792279689258923542019956112129021960864034418159813629774771309960518707211349999998372978049951059731732816096318595024459455346908302642522308253344685035261931188171010003137838752886587533208381420617177669147303598253490428755468731159562863882353787593751957781857780532171226806613001927876611195909216420198938095257201065485863278865936153381827968230301952035301852968995773622599413891249721775283479131515574857242454150695950829533116861727855889075098381754637464939319255060400927701671139009848824012858361603563707660104710181942955596198946767837449448255379774726847104047534646208046684259069491293313677028989152104752162056966024058038150193511253382430035587640247496473263914199272604269922796782354781636009341721641219924586315030286182974555706749838505494588586926995690927210797509302955321165344987202755960236480665499119881834797753566369807426542527862551818417574672890977772793800081647060016145249192173217214772350141441973568548161361157352552133475741849468438523323907394143334547762416862518983569485562099219222184272550254256887671790494601653466804988627232791786085784383827967976681454100953883786360950680064225125205117392984896084128488626945604241965285022210661186306744278622039194945047123713786960956364371917287467764657573962413890865832645995813390478027590099465764078951269468398352595709825822620522489407726719478268482601476990902640136394437455305068203496252451749399651431429809190659250937221696461515709858387410597885959772975498930161753928468138268683868942774155991855925245953959431049972524680845987273644695848653836736222626099124608051243884390451244136549762780797715691435997700129616089441694868555848406353422072225828488648158456028506016842739452267467678895252138522549954666727823986456596116354886230577456498035593634568174324112515076069479451096596094025228879710893145669136867228748940560101503308617928680920874760917824938589009714909675985261365549781893129784821682998948722658804857564014270477555132379641451523746234364542858444795265867821051141354735739523113427166102135969536231442952484937187110145765403590279934403742007310578539062198387447808478489683321445713868751943506430218453191048481005370614680674919278191197939952061419663428754440643745123718192179998391015919561814675142691239748940907186494231961567945208095146550225231603881930142093762137855956638937787083039069792077346722182562599661501421503068038447734549202605414665925201497442850732518666002132434088190710486331734649651453905796268561005508106658796998163574736384052571459102897064140110971206280439039759515677157700420337869936007230558763176359421873125147120532928191826186125867321579198414848829164470609575270695722091756711672291098169091528017350671274858322287183520935396572512108357915136988209144421006751033467110314126711136990865851639831501970165151168517143765761835155650884909989859982387345528331635507647918535893226185489632132933089857064204675259070915481416549859461637180270981994309924488957571282890592323326097299712084433573265489382391193259746366730583604142813883032038249037589852437441702913276561809377344403070746921120191302033038019762110110044929321516084244485963766983895228684783123552658213144957685726243344189303968642624341077322697802807318915441101044682325271620105265227211166039666557309254711055785376346682065310989652691862056476931257058635662018558100729360659876486117910453348850346113657686753249441668039626579787718556084552965412665408530614344431858676975145661406800700237877659134401712749470420562230538994561314071127000407854733269939081454664645880797270826683063432858785698305235808933065757406795457163775254202114955761581400250126228594130216471550979259230990796547376125517656751357517829666454779174501129961489030463994713296210734043751895735961458901938971311179042978285647503203198691514028708085990480109412147221317947647772622414254854540332157185306142288137585043063321751829798662237172159160771669254748738986654949450114654062843366393790039769265672146385306736096571209180763832716641627488880078692560290228472104031721186082041900042296617119637792133757511495950156604963186294726547364252308177036751590673502350728354056704038674351362222477158915049530984448933309634087807693259939780541934144737744184263129860809988868741326047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Jess T
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Posted: 16th Nov 2003 12:35
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Damn it Phaelax, put that in a code box please...


Team EOD :: Programmer/Logical Engineer/All-Round Nice Guy
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JoelJ
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Posted: 17th Nov 2003 07:17
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CPU: post that here if you can, i want to see

Two words, moo.
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