Module: gears.geometry

Helper functions used to compute geometries.

When this module refer to a geometry table, this assume a table with at least an x, y, width and height keys and numeric values.

Info:

  • Copyright: 2008 Julien Danjou
  • Originally authored by: Julien Danjou <julien@danjou.info>
    (Full contributors list available on our github project)

Static module functions

gears.geometry.rectangle.get_square_distance (geom, x, y) -> number Get the square distance between a rectangle and a point.
gears.geometry.rectangle.get_closest_by_coord (list, x, y) -> () Return the closest rectangle from list for a given point.
gears.geometry.rectangle.get_by_coord (list, x, y) -> () Return the rectangle containing the [x, y] point.
gears.geometry.rectangle.get_in_direction (dir, recttbl, cur) -> () Get the nearest rectangle in the given direction.
gears.geometry.rectangle.are_equal (a, b) -> boolean Return true if the area are exactly identical.
gears.geometry.rectangle.is_inside (a, b) -> boolean Return if rectangle a is within rectangle b.
gears.geometry.rectangle.area_intersect_area (a, b) -> () Check if an area intersect another area.
gears.geometry.rectangle.get_intersection (a, b) -> table Get the intersect area between a and b.
gears.geometry.rectangle.area_remove (areas, elem) -> () Remove an area from a list, splitting the space between several area that can overlap.


Static module functions

gears.geometry.rectangle.get_square_distance (geom, x, y) -> number
Get the square distance between a rectangle and a point.

Parameters:

  • geom A rectangle
    • x number The horizontal coordinate
    • y number The vertical coordinate
    • width number The rectangle width
    • height number The rectangle height
  • x number X coordinate of point
  • y number Y coordinate of point

Returns:

    number The squared distance of the rectangle to the provided point.
gears.geometry.rectangle.get_closest_by_coord (list, x, y) -> ()
Return the closest rectangle from list for a given point.

Parameters:

  • list table A list of geometry tables.
  • x number The x coordinate
  • y number The y coordinate

Returns:

    The key from the closest geometry.
gears.geometry.rectangle.get_by_coord (list, x, y) -> ()
Return the rectangle containing the [x, y] point.

Note that if multiple element from the geometry list contains the point, the returned result is nondeterministic.

Parameters:

  • list table A list of geometry tables.
  • x number The x coordinate
  • y number The y coordinate

Returns:

    The key from the closest geometry. In case no result is found, nil is returned.
gears.geometry.rectangle.get_in_direction (dir, recttbl, cur) -> ()
Get the nearest rectangle in the given direction. Every rectangle is specified as a table with x, y, width, height keys, the same as client or screen geometries.

Parameters:

  • dir string The direction, can be either up, down, left or right.
  • recttbl table A table of rectangle specifications.
  • cur table The current rectangle.

Returns:

    The index for the rectangle in recttbl closer to cur in the given direction. nil if none found.
gears.geometry.rectangle.are_equal (a, b) -> boolean
Return true if the area are exactly identical.

The areas are table with a x, y, width and height keys.

Parameters:

Returns:

    boolean If the areas are identical.
gears.geometry.rectangle.is_inside (a, b) -> boolean
Return if rectangle a is within rectangle b.

This includes the edges. 100% of a area has to be within b for this function to return true. If you wish to know if any part of a intersect with b, use gears.geometry.rectangle.get_intersection.

Parameters:

  • a table The smaller area.
  • b table The larger area.

Returns:

    boolean If the areas are identical.

See also:

gears.geometry.rectangle.area_intersect_area (a, b) -> ()
Check if an area intersect another area.

Parameters:

Returns:

    True if they intersect, false otherwise.
gears.geometry.rectangle.get_intersection (a, b) -> table
Get the intersect area between a and b.

Parameters:

  • a The area.
    • x number The horizontal coordinate
    • y number The vertical coordinate
    • width number The rectangle width
    • height number The rectangle height
  • b The other area.
    • x number The horizontal coordinate
    • y number The vertical coordinate
    • width number The rectangle width
    • height number The rectangle height

Returns:

    table The intersect area.

See also:

gears.geometry.rectangle.area_remove (areas, elem) -> ()
Remove an area from a list, splitting the space between several area that can overlap.

Parameters:

  • areas table Table of areas.
  • elem Area to remove.
    • x number The horizontal coordinate
    • y number The vertical coordinate
    • width number The rectangle width
    • height number The rectangle height

Returns:

    The new area list.
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