Cabal Common Library Doc Functions

Overview

This is the main class for the helper library with its members. Scripts can instantiate a copy, e.g.

	this.myHelper = new Cabal_Common();

The Profiler boxes will give you a quick overview about runtimes. Times are measured with the listed examples.

Properties

internalVersion

Number. Property to give OXPs a chance to check the required lib min. version easily. This number will be raised with every release.

	var a = this.myHelper.internalVersion; a -> 15

Methods

baseChange()

	baseChange: function(n, to, from )

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Changes the base of n.

Parameters:

n

Number. To be changed.

to

Number. Base which should be used to convert to. Usually 2,10 or 16.

from

Number. Optional. Base from which should be converted. Usually 2,10 or 16.

Returns:

str

String. Base changed.

	var a = this.myHelper.baseChange(10, 16); // convert decimal 10 to hex var b = this.myHelper.baseChange(0xA, 2); // convert hex 0xA (10) to binary var c = this.myHelper.baseChange('a', 2, 16); // alternative convert hex 0xA to binary a -> 'a', b -> '1010', c -> '1010'

Author: Dr.J R Stockton.

clamp()

	clamp: function(value, max, min )

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Clamps value to max...min.

Paramaters:

value

Number. To be clamped.

max

Number. Maximum.

min

Number. Minimum.

Returns:

n

Number. Clamped.

	var a = this.myHelper.clamp(Math.random(),0.6,0.2); a -> 0.2

msbPos()

	msbPos: function( n )

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Returns position of most significant bit of n.

Paramaters:

n

Number. To be evaluated.

Returns:

n

Number. The position of the most significant bit or 0 (zero).

	var a = this.myHelper.msbPos(25); a -> 5

Author: Dr.J R Stockton.

nBitsUsed()

	nBitsUsed: function( n )

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Returns number of bits set in n. If n<0 a bitwise NOT will be applied before execution.

Parameters:

n

Number. To be evaluated.

Returns:

e

Number. The counted number of bits set to 1.

	var a = this.myHelper.nBitsUsed(13); a -> 3

num2Prec()

	num2Prec: function( x, p )

Returns rounded number with specified precision.

Parameters:

x

Number. To be rounded.

p

Number. Precision.

Returns:

e

Number. The rounded number.

	var a = this.myHelper.num2Prec(25.06532123,3); a -> 25.065

pseudoRand()

	pseudoRand: function( salt, mode )

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LCG (Linear congruential generator) pseudo-random number generator with salt (and pepper). Can be used to generate deterministic unique values, e.g. to decide if a specific entity should be spawned.

Parameters:

salt

Number. This is used to generate a pseudo random number.

mode

Boolean. Optional. If specified and true the returned value is integer (Math.floor(n*100)).

Returns:

n

Number.

• No mode. In range 0...1,
• mode. In range 0...100.

	var test = this.myHelper.pseudoRand(55); test -> 0.11969016003422439 var test = this.myHelper.pseudoRand(55,true); test -> 11

Author: Jens Ayrton (Ahruman).

rand()

	rand: function( n )

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Random number in range 0...n.

Parameters:

n

Number. Maximum value.

Returns:

n

Number. Returns the random Number.

	var crc = this.myHelper.rand(35); crc -> 12

Author: Dr.J R Stockton.

randSpan()

	randSpan: function( minN, maxN )

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Random number in range minN...maxN.

Paramaters:

minN

Number. Minimum.

maxN

Number. Maximum.

Returns:

n

Number. The newly generated random Number.

	var crc = this.myHelper.randSpan(35,88); crc -> 55

Author: Dr.J R Stockton.

strCompareVersion()

	strCompareVersion: function( strA, strB )

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Compares version strings (like “2.0.3”) against each other and returns number. It also strips pre/suffixes like “Build” or “Beta”. Subroutine from oxpVersionTest() and oxpVersionTest2Array(), but can also be used directly.

Parameters:

strA

String. Actual version.

strB

String. Version to be compared against.

Returns:

• 0 - Number. If strA < strB
• 1 - Number. If strA = strB
• 2 - Number. If strA > strB

	var check = this.myHelper.strCompareVersion("Beta2.1","1.0.7"); check -> 2

strDateFromMinutes()

	strDateFromMinutes: function( minutes )

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Takes an integer number of minutes and converts it into a string. The returned string has the form 'd' days, 'h' hours and 'm' minutes, accomodating all cases of singular, plural, and 0.

Parameters:

minutes

Number. The time in minutes.

Returns:

timeString

String.

	var str = this.myHelper.strDateFromMinutes(56566); str -> 39 days, 6 hours and 46 minutes var str = this.myHelper.strDateFromMinutes(-56566); str -> 39 days, 6 hours and 46 minutes ago

Author: Commander McLane.

strDecrypt()

	strDecrypt: function( str, pwd )

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Decrypts string.

Parameters:

str

String. To be decrypted. Minimum length 6 chars.

pwd

String. Password. Minimum length 4 chars.

Returns:

dec_str

String/Boolean. Decrypted string or false.

	var test = this.myHelper.strDecrypt("6053cae17efb01230f4768046cac63","MYPASS"); test -> "Hello world"

Author: Terry Yuen.

strEncrypt()

	strEncrypt: function( str, pwd )

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Encrypts string.

Parameters:

str

String. To be encrypted. Minimum length 6 chars.

pwd

String. Password. Minimum length 4 chars.

Returns:

enc_str

String/Boolean. Encrypted string or false.

	var test = this.myHelper.strEncrypt("Hello world","MYPASS"); test -> "6053cae17efb01230f4768046cac63"

Author: Terry Yuen.

strGetCRC()

	strGetCRC: function( str )

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Very simple CRC from string and does not create unique checksums. It uses Unicodes, but limits every char via &0xff and the output via &0x3fff.

Parameters:

str

String. Which should be used to create a CRC.

Returns:

crc

Number. The CRC.

	var crc = this.myHelper.strGetCRC("Hello"); crc -> 500

strLZ()

	strLZ: function( n )

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Returns string with a leading zero if n<10.

Parameters:

n

Number. To be evaluated.

Returns:

str

String. With leading zero if necessary.

	var a = this.myHelper.strLZ(3); a -> "03"

Author: Dr.J R Stockton.

strLZZ()

	strLZZ: function( n )

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Returns string with a leading zeros if n<100. Uses strLZ() as subfunction.

Parameters:

n

Number. To be evaluated.

Returns:

str

String. With leading zeros if necessary.

	var a = this.myHelper.strLZZ(3); a -> "003"

Author: Dr.J R Stockton.

strNLZ()

	strNLZ: function( n,len )

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Returns string with length of len filled with leading zeros.

Parameters:

n

Number. To be evaluated.

len

Number. Length. Maximum is 10.

Returns:

str

String. Filled up with leading zeros.

	var a = this.myHelper.strNLZ(3,4); a -> "0003"

strScreenSubString()

	strScreenSubString: function( str, chrs )

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Formats the string str into lines of at most chrs characters in length. Subfunction of strScreenString().

Parameters:

str

String. To be used.

chrs

Number. The length.

Returns:

out

String. With specified length.

	var scr = this.myHelper.strScreenSubString("Iwantthisandnotthatandforsurenotsuch",16); scr -> "Iwantthisandnott\nhatandforsurenot\nsuch"

strScreenString()

	strScreenString: function( str, mode, chrs )

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Splits string in pieces of chrs, with intermediate linebreaks for missionscreens. The method splits the incoming string by spaces and loops over the elements, and tries to fill up the current line until the maximum length (chrs) is reached. If there are still remaining elements the next line will be used. The replacement (mode) is done via regexp and removes the following: ‘\t \r \f \n \v’. If splitting is not possible or a word is longer than chrs, strScreenSubString() will be used.

Parameters:

str

String. To be used.

mode

Boolean. Optional. If mode is false or not specified it replaces special signs like linebreaks with spaces.

chrs

Number. Optional. Length. If not specified default of 70 is used.

Returns:

display

String. With linebreaks.

	var scr = this.myHelper.strScreenString("I want this and not that and for sure not such",1,16); scr -> "I want this and\nnot that and for\nsure not such"

strSplitToPhrases()

	strSplitToPhrases: function( str, n )

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Splits string into n words phrases.

Parameters:

str

String. To be used.

n

Number. Words.

Returns:

out

Array. Containing Strings with n words per element.

	var cleanedArray = this.myHelper.strSplitToPhrases("My cat has a good time",3); cleanedArray -> "My cat has","cat has a","has a good","a good time"

strToWidth()

	strToWidth: function( str, max, chr )

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Returns string with specific length based on Oolites font size. If stringwidth > max it is truncated, otherwise filled up with space or specified chr.

Parameters:

str

String. To be used.

max

Number. Maximum width.

chr

String. Char to be used to fill up if stringwidth < max.

Returns:

str

String. With specified width.

	var a = this.myHelper.strToWidth("MyveryOwnApproach",3); a -> "Myvery"

arrDiff()

	arrDiff: function( ar1, ar2 )

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Returns difference between two arrays.

Parameters:

ar1

Array. First.

ar2

Array. Second.

Returns:

diff

Array. Difference between two arrays.

	var testA = ["AA","AB","AC"],testB = ["AB","AC","AD"]; var cleanedArray = this.myHelper.arrDiff(testA,testB); cleanedArray -> "AA","AD"

arrRemoveByValue()

	arrRemoveByValue: function( arr, val )

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Removes specific entry from array.

Parameters:

arr

Array. From which things should be removed.

val

Object. Value that has to be removed.

Returns:

arr

Array. The cleaned array.

	var testA = ["A","B","C"]; var cleanedArray = this.myHelper.arrRemoveByValue(testA,"B"); cleanedArray -> "A","C"

arrShuffle()

	arrShuffle: function( arr )

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Returns shuffled array.

Parameters:

arr

Array.

Returns:

SHU

Array. Shuffled.

	var Q = "ABCDEFGHIKJKLM".split(""); var shuffledArray = this.myHelper.arrShuffle(Q); shuffledArray -> ["B","I","M","A","K","C","F","H","K","J","D","E","L","G"]

Author: Dr.J R Stockton.

arrSortByProperty()

	arrSortByProperty: function( arr, prop )

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Sort array containing objects by specific property.

Parameters:

arr

Array. To be sorted.

prop

String. Propertyname.

Returns:

what

Array. Sorted by specified property.

	var objA = [{ID:2,Other:"TestA"},{ID:1,Other:"TestB"}]; var sorted = this.myHelper.arrSortByProperty(objA,"ID"); sorted -> [{ID:1,Other:"TestB"},{ID:2,Other:"TestA"}]

arrUnique()

	arrUnique: function( arr )

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Removes duplicates from array.

Parameters:

arr

Array. The input array, from which duplicates are to be removed.

Returns:

r

Array. The cleaned array.

	var testArray = ["AB","AB","AB","AC","AC","AC"]; var cleanedArray = this.myHelper.arrUnique(testArray); cleanedArray -> "AB","AC"

mapCoordsDirection()

	mapCoordsDirection: function( posA, posB )

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Returns the general direction of the target coordinates compared to the current (or specified) system coordinates.

Parameters:

posA

Vector/ID. Map coordinates in LYs or simply a system.ID.

posB

Vector/ID. Optional. Map coordinates in LYs or simply a system.ID. Defaults to current system coordinates.

Returns:

str

String.

	var dir = this.myHelper.mapCoordsDirection([27,33,0]); dir -> "north-west"

Author: Eric Walch.

oxpVersionTest()

	oxpVersionTest: function( who, requires, quiet )

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Checks required OXPs and versions. The array is expected to contain two elements for each script and version must be null for legacy scripts!

Checking requirements can be a pain as the version property often contains several numbers, such as Oolites own scripts (“1.74.2”), and checking for a minimum version is sometimes necessary. The method does exactly this and returns false if the requirments are not matched and logs where they are not fullfilled. It also strips pre/suffixes like “Build” or “Beta”. To use it you’ll need an array of required OXPs and their versions. This array can hold JS and Legacy worldScripts and the version can be set to null (required for Legacy), false or 0 (integer) to bypass the version test and only perform the check for existance. The method checks for a property ‘deactivated’ in OXPs to determine whether or not they are deactived.

Parameters:

who

String. Actual scriptname. It’s only used to log for which OXP the requirements are not fullfilled.

requires

Array. Holds for every required OXP the scriptname and version. To check only for existance set version to null.

quiet

Boolean. Optional. If true don't log, only check.

Returns:

Boolean.

• false - If a requirement is not fullfilled or OXP is deactivated,
• true - Otherwise.

	var requires = ["snoopers","2.0.8","vector","1.5","Cabal_Common_Keyboard","1.0"]; var checked = this.myHelper.oxpVersionTest(this.name,requires); checked -> true (or false)

oxpVersionTest2Array()

	oxpVersionTest2Array: function( who, requires, quiet )

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Checks required OXPs and versions. The array is expected to contain two elements for each script and version must be null for legacy scripts! See the description for oxpVersionTest() for more details.

Parameters:

who

String. Actual scriptname. It’s only used to log for which OXP the requirements are not fullfilled.

requires

Array. Holds for every required OXP the scriptname and version. To check only for existance set version to null.

quiet

Boolean. Optional. If true don't log, only check.

Returns:

checked

Array. With values for checked elements of requires.

• 2 - version is greater,
• 1 - version is equal,
• 0 - not installed,
• -1 - OXP is deactivated,
• -2 - version is lower.

	var requires = ["snoopers","2.0.8","vector","1.5","Cabal_Common_Keyboard","1.0"]; var checked = this.myHelper.oxpVersionTest2Array(this.name,requires); checked -> 1,-2,1

entModelView()

	entModelView: function( which )

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Spawns or resets the modelview entity and returns it. Via JS we can set the orientation, position, etc. of the displayed model, but we can’t stop the rotation if spinModel is not explicitely set to false, because it is hardcoded for screen models and the AI of the model itself can’t do it, because AIs are not executed on missionscreens. That’s why we sometimes need a control entity to do the job.

The modelview entity scans for a specific role and if found sets its target and does the “safeScriptActionOnTarget: performTumble” on the missionscreen model. This overrides the hardcoded rotation with the specified settings in shipdata.plist for the model.

The model (for the missionscreen) has to declare

• role to be scanned via modelview entity - default for the library is ‘cabal_common_model’.
• max_flight_pitch (usually between 0..0.2)
• max_flight_roll (usually between 0..0.2)

Parameters:

which

String. Optional. Role to be used for modelview. If not specified defaults to ‘cabal_common_modelview’.

Returns:

mv

Entity. Returns modelview Entity or null.

	var a = this.myHelper.entModelView(); a -> [Ship "cabal_common_modelview" position: (8846.43, 8857.51, -2544.76) scanClass: CLASS_NEUTRAL status: STATUS_IN_FLIGHT]

entFaceEntity()

	entFaceEntity: function( ent1, ent2 )

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This function causes ent1 to be reorientated such that it faces ent2. A common use-case is when spawning stations whose docking tunnel should face another entity, typically the main planet. Reorienting is instantly.

Parameters:

ent1

Entity. To be reoriented.

ent2

Entity. To which ent1 should be oriented.

Returns:

nothing.

	var a = player.ship.target; var b = system.mainPlanet; this.myHelper.entFaceEntity(a,b);

entScreenCornerPos()

	entScreenCornerPos: function( level, signx, signy, further )

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Missionscreen model corner positioning.

Parameters:

level

Number. Amount of moving to screen corner. (0.0 ... 1.0).

signx

Number. Used as sign mantissa and multiplier (-1...1) for X axis.

signy

Number. Used as sign mantissa and multiplier (-1...1) for Y axis.

further

Number. Multiplier for Z axis. Defaults to 1.3.

Returns: nothing.

	this.myHelper.entScreenCornerPos(0.8,0.9,1.1,3.2);

screenGCD()

	screenGCD: function( a, b )

Returns greatest common denominator. Subfunction of .screenChecks().

Parameters:

a

Number.

b

Number.

Returns:

n

Number.

	var a = this.myHelper.screenGCD(25,5); a -> 5

screenAspect()

	screenAspect: function( w, h )

Returns aspect ratio. Subfunction of .screenChecks().

Parameters:

w

Number. Width.

h

Number. Height.

Returns:

n

Number.

	var a = this.myHelper.screenAspect(1024,768); a -> 1.3333333333

screenChecks()

	screenChecks: function( w, h )

Returns array with width, height, gcd and aspect ratio.

Parameters:

w

Number. Width. Optional.

h

Number. Height. Optional.

Returns:

a

Array.

	var a = this.myHelper.screenChecks(); a -> [1024,768,256,1.33333333]