Modding:Area

Areas describe a box of coords, effectively representing a part of the potential map positions. They are mostly used as a superior alternative to a table of coords, and many of its API functions can be used to obtain coords from a given area.

Properties

Although areas are technically userdata, they can be indexed like normal tables.

Area
Coord	a	This is the upper-leftmost coord of the area.
Coord	b	This is the bottom-rightmost coord of the area

API

Area Interface
Area	area.new(Coord a, Coord b)
Area	area.new(integer x1, integer y1, integer x2, integer y2)
boolean	area.eq(Area lhs, Area, rhs)
boolean	Area:contains(Coord c)
boolean	Area:contains(Area a)
boolean	Area:is_edge(Coord c)
Coord	Area:get()
Coord	Area:dim()
integer	Area:size()
Area	Area:clone()
Area	area.around( Coord c, integer value)
string	Area:tostring()
Area	Area:random_subarea(Coord dim)
Coord	Area:random_coord()
Coord	Area:random_edge_coord()
Coord	Area:random_inner_edge_coord()
Void	Area:shrink(integer value)
Area	Area:shrinked(integer value)
Void	Area:expand(integer value)
Area	Area:expanded(integer value)
Void	Area:clamp(Area a)
Area	Area:clamped(Area a)
void	Area:clamp_coord(Coord c)
Void	Area:fix()
boolean	Area:proper()
CoordIterator	Area:coords()
CoordIterator	Area:edges()
CoordIterator	Area:corners()

area.new(Coord a, Coord b) → Area

This creates a new area, using a and b as the upper-left and bottom-right coords as the extent of the area.

area.new(integer x1, integer y1, integer x2, integer y2) → Area

This creates a new area, using x1 and y1 as the upper-left position and x2 and y2 as the bottom-right position. Using this definition is the same as area.new( coord.new(x1,y1), coord.new(x2,y2) ).

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coord.eq( Area lhs, Area, rhs) → boolean

Area lhs == Area rhs → boolean

This determines if the given areas are coordinate-wise equal. (They might still be different objects! Beware using areas as table keys.)

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Area:contains(Coord c) → boolean

This determines if c' is contained in the given area.

Area:contains(Area c) → boolean

This determines if a is contained in the given area. a' must be completely within the given area for this function to return a true value.

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Area:is_edge(Coord c) → boolean

This determines if c is an edge coord of the given area. An edge coord is determined as a coord that shares an x- or y-coordinate with the upper-left or bottom-right coords.

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Area:get() → Coord, Coord

Returns the upper-left and bottom-right coords of the area (in that order).

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Area:dim() → Coord

Returns a coord representing the area's width in its x-coordinate and the area's height in its y-coordinate.

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Area:size() → integer

Returns an integer equal to the product of the area's height and width.

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Area:clone() → Area

Returns a copy of the area. This is important if you are, for example, using a coordinate iterator to select particular coordinates and store them in a table.

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area.around(Coord c, integer value) → Area

This creates an area around c whose edges extend by value from c. value is optional: it defaults to 1.

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Area:tostring() → string

Returns a string containing the x1, y1, x2, and y2 positions separated by a comma. (x1 and y1 refer to the upper-left coordinate, while x2 and y2 refer to the bottom-right coordinate.)

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Area:random_subarea(Coord dim) → Area

Returns an random area in the given area of dimensions dim' = coord.new(width,height). (The new area will never lie on the bottom or right edges of the original area.)

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Area:random_coord() → Coord

Returns a random coord within the area.

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Area:random_edge_coord() → Coord

Returns a random edge coord within the area.

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Area:random_inner_edge_coord() → Coord

Returns a random inner edge coord within the area. An inner edge coord is one that is also not a corner coord.

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Area:shrink(integer value)

Shrinks each edge of the area by value. value is optional: it defaults to 1. (Warning: this can cause the area to become invalid, such that the top-left coord is greater than the bottom-right one).

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Area:shrinked(integer value) → Area

As shrink, except instead of changing the existing area, a new area is created.

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Area:expand(integer value)

Expands each edge of the area by value. value is optional: it defaults to 1. (Warning: this can cause the area to become invalid, such that the top-left or bottom-right coords area beyond the scope of the map.

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Area:expanded(integer value) → Area

As expand, except instead of changing the existing area, a new area is created.

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Area:clamp(Area a)

Forces the area within the boundaries of a. Thus, if the original a has a top-left coordinate less than a's or a bottom-right coordinate greater than a's, that value will instead be set equal to a's. This can be used to validate an area changed by the :expand() function.

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Area:clamped(Area a) → Area

As clamp, except instead of changing the existing area, a new area is created.

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Area:clamp_coord(Coord c) → void

Forces c within the boundaries of the given area. See :clamp() for explanation.

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Area:fix()

Forces the area such that the top and left coordinates are at least equal to the bottom and right coordinates, respectively. This can be used to validate an area changed by the :shrink() function.

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Area:proper() → boolean

This determines if the top and left coordinates of the area are less than or equal to the bottom and right coordinates, respectively.

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Area:coords() → Coord iterator

Gives an iterator over all coords within the area. The iterator process begins in the upper-left coord and travels along each row from left to right, top to bottom.

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Area:edges() → Coord iterator

Gives an iterator over all edge coords within the area.

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Area:corners() → Coord iterator

Gives an iterator over all corner coords within the area. A corner coord is determine as a coord that is shares an x- and y-coordinate with the upper-left or bottom-right coords.

Constants

Constant Coords
null	area.FULL	This is an area equal to the full extent of the map. It is equivalent to area.new(1,1,78,20).
null	area.FULL_SHRINKED	This is an area equal to the full extend of the map, excluding its boundaries. It is equivalent to area.new(2,2,77,19).