A to Z Scripting: Basic maths - Revision history

Geep: /* Increasing/decreasing */ Warn against prefix forms

2023-02-01T19:35:22Z

Increasing/decreasing: Warn against prefix forms

← Older revision		Revision as of 19:35, 1 February 2023
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	counter = counter + 1; //set "counter" to: the current value of "counter" + 1		counter = counter + 1; //set "counter" to: the current value of "counter" + 1
	counter += 1; //set "counter" to: the current value of "counter" + 1		counter += 1; //set "counter" to: the current value of "counter" + 1


	An alternative method to increase or decrease a variable by 1 is:		An alternative method to increase or decrease a variable by 1 is:
	counter++; //increase "counter" by 1		counter++; //increase "counter" by 1
	counter--; //decrease "counter" by 1		counter--; //decrease "counter" by 1

			Be aware that the alternative "prefix" forms of these - found in the C language - are not supported:
			++counter; // not legal
			--counter; // not legal

	== Combining ==		== Combining ==

Dragofer: /* Increasing/decreasing */

2020-12-28T22:55:26Z

Increasing/decreasing

← Older revision		Revision as of 22:55, 28 December 2020
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	counter = counter + 1; //set "counter" to: the current value of "counter" + 1		counter = counter + 1; //set "counter" to: the current value of "counter" + 1
	counter += 1; //set "counter" to: the current value of "counter" + 1		counter += 1; //set "counter" to: the current value of "counter" + 1


	An alternative method to increase or decrease a variable by 1 is:		An alternative method to increase or decrease a variable by 1 is:
	counter++; //increase "counter" by 1		counter++; //increase "counter" by 1
	counter--; //decrease "counter" by 1		counter--; //decrease "counter" by 1


	== Combining ==		== Combining ==

Dragofer at 22:38, 28 December 2020

2020-12-28T22:38:34Z

← Older revision		Revision as of 22:38, 28 December 2020
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	== is used in conditionals to check whether a condition is true (2 values are equal to each other) before carrying out an associated set of instructions. That's described in detail in a later article, [[A to Z Scripting: Conditionals]].		== is used in conditionals to check whether a condition is true (2 values are equal to each other) before carrying out an associated set of instructions. That's described in detail in a later article, [[A to Z Scripting: Conditionals]].


	The = sign can be combined with a maths symbol. Both the lines below do the exact same thing:		The = sign can be combined with a maths symbol. Both the lines below do the exact same thing:

Dragofer at 22:38, 28 December 2020

2020-12-28T22:38:04Z

← Older revision		Revision as of 22:38, 28 December 2020
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	== is used in conditionals to check whether a condition is true (2 values are equal to each other) before carrying out an associated set of instructions. That's described in detail in a later article, [[A to Z Scripting: Conditionals]].		== is used in conditionals to check whether a condition is true (2 values are equal to each other) before carrying out an associated set of instructions. That's described in detail in a later article, [[A to Z Scripting: Conditionals]].

			The = sign can be combined with a maths symbol. Both the lines below do the exact same thing:
			float1 = float1 + float2; //set float1 to: current value + float2
			float1 += float2; //set float1 to: current value + float2


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	Increasing (incrementing) a variable's value by 1 would work like this:		Increasing (incrementing) a variable's value by 1 would work like this:
	counter = counter + 1; //set "counter" to: the current value of "counter" + 1		counter = counter + 1; //set "counter" to: the current value of "counter" + 1
			counter += 1; //set "counter" to: the current value of "counter" + 1

	An alternative method to increase a variable by 1 is:		An alternative method to increase or decrease a variable by 1 is:
	counter++; //increase "counter" by 1		counter++; //increase "counter" by 1
	counter--; //decrease "counter" by 1		counter--; //decrease "counter" by 1
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	sys.println(entity1.getName() + " is at the location " + entity1.getOrigin()); //+ doesn't work with entities, so you need to use getName() to turn it into a string		sys.println(entity1.getName() + " is at the location " + entity1.getOrigin()); //+ doesn't work with entities, so you need to use getName() to turn it into a string

	What you can't do is ~~combine~~ floats and vectors. You'll need to i.e. use a script event to convert the vector into a float (see "Vectors").		What you can't do is perform maths operations with both floats and vectors. You'll need to i.e. use a script event to convert the vector into a float (see "Vectors").

Dragofer at 19:25, 28 December 2020

2020-12-28T19:25:37Z

← Older revision		Revision as of 19:25, 28 December 2020
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	int() is a utility script, you can read more about them here: [[A to Z Scripting: Utility scripts]].		int() is a utility script, you can read more about them here: [[A to Z Scripting: Utility scripts]].


	== Vectors ==		== Vectors ==

Dragofer: /* Integers */

2020-12-28T19:25:21Z

Integers

← Older revision		Revision as of 19:25, 28 December 2020
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	== Integers ==		== Integers ==
	There's no data type for integers in DoomScript, but you can make an integer out of a float like this ~~(this uses a utility script called int(), see [[A to Z Scripting: Utility scripts]])~~:		There's no data type for integers in DoomScript, but you can make an integer out of a float like this:
	float integer1 = int(5.8); //returns 5		float integer1 = int(5.8); //returns 5

			int() is a utility script, you can read more about them here: [[A to Z Scripting: Utility scripts]].

	== Vectors ==		== Vectors ==

Dragofer at 19:24, 28 December 2020

2020-12-28T19:24:28Z

← Older revision		Revision as of 19:24, 28 December 2020
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	What you can't do is combine floats and vectors. You'll need to i.e. use a script event to convert the vector into a float (see "Vectors").		What you can't do is combine floats and vectors. You'll need to i.e. use a script event to convert the vector into a float (see "Vectors").


			== Integers ==
			There's no data type for integers in DoomScript, but you can make an integer out of a float like this (this uses a utility script called int(), see [[A to Z Scripting: Utility scripts]]):
			float integer1 = int(5.8); //returns 5

Dragofer at 23:42, 23 December 2020

2020-12-23T23:42:22Z

← Older revision		Revision as of 23:42, 23 December 2020
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	*Previous article: [[A to Z Scripting: More scripting basics]]		*Previous article: [[A to Z Scripting: More scripting basics]]
	*Table of contents: [[A to Z Scripting]]		*Table of contents: [[A to Z Scripting]]

			[[Category:Scripting]]

Dragofer: /* Vectors */

2020-12-23T13:00:03Z

Vectors

← Older revision		Revision as of 13:00, 23 December 2020
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	== Vectors ==		== Vectors ==
	You can add or subtract vectors from each other. Things like multiplication or ~~finding the magnitude~~ require script events such as DotProduct(), CrossProduct() and vecLength().		You can add or subtract vectors from each other. Things like multiplication or turning a vector into a distance require script events such as DotProduct(), CrossProduct() and vecLength().

	You can access & change individual components of a vector variable by appending _x, _y or _z to the name, i.e. teleport_destination_z. These will be floats.		You can access & change individual components of a vector variable by appending _x, _y or _z to the name, i.e. teleport_destination_z. These will be floats.
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	More detail on vector maths and what you can do with it in [[A to Z Scripting: Special methods]].		More detail on vector maths and what you can do with it in [[A to Z Scripting: Special methods]].


	== Next / previous article ==		== Next / previous article ==

Dragofer at 12:58, 23 December 2020

2020-12-23T12:58:17Z

@@ Line 21: / Line 21: @@
 == is used in conditionals to check whether a condition is true (2 values are equal to each other) before carrying out an associated set of instructions. That's described in detail in a later article, [[A to Z Scripting: Conditionals]].
 == Combining ==
@@ Line 31: / Line 41: @@
 What you can't do is combine floats and vectors. You'll need to i.e. use a script event to convert the vector into a float (see "Vectors").