NAME

"Tickit::Rect" - a lightweight data structure representing a rectangle

SYNOPSIS

 use Tickit::Rect;

 my $rect = Tickit::Rect->new(
    top => 0, left => 5, lines => 3, cols => 10
 );

DESCRIPTION

Objects in this class represent a rectangle, by storing the top left corner coordinate and the size in lines and columns. This data structure is purely abstract and not tied to a particular window or coordinate system. It exists simply as a convenient data store containing some useful utility methods.

CONSTRUCTORS

new

   $rect = Tickit::Rect->new( %args )

Construct a new rectangle of the given geometry, given by "top", "left" and either "lines" and "cols", or "bottom" and "right".

   $rect = Tickit::Rect->new( $str )

If given a single string, this will be parsed in the form

 (left,top)..(right,bottom)

intersect

   $rect = $existing_rect->intersect( $other_rect )

If there is an intersection between the given rectangles, return it. If not, return "undef".

translate

   $rect = $existing_rect->translate( $downward, $rightward )

Returns a new rectangle of the same size as the given one, moved down and to the right by the given argmuents (which may be negative)

ACCESSORS

top

left

bottom

right

   $top = $rect->top

   $left = $rect->left

   $bottom = $rect->bottom

   $right = $rect->right

Return the edge boundaries of the rectangle.

lines

cols

   $lines = $rect->lines

   $cols = $rect->cols

Return the size of the rectangle.

linerange

   @lines = $rect->linerange( $min, $max )

A convenient shortcut to generate the list of lines covered that are within the given bounds (either bound may be given as "undef"). Without bounds, equivalent to:

   $rect->top .. $rect->bottom - 1

METHODS

equals

   $bool = $rect->equals( $other )

   $bool = ( $rect == $other )

Returns true if $other represents the same area as $rect. This method overloads the numerical equality operator ("==").

contains

   $bool = $rect->contains( $other )

Returns true if $other is entirely contained within the bounds of $rect.

intersects

   $bool = $rect->intersects( $other )

Returns true if $other and $rect intersect at all, even if they overlap.

add

   @r = $rect->add( $other )

Returns a list of the non-overlapping regions covered by either $rect or $other.

In the trivial case that the two given rectangles do not touch, the result will simply be a list of the two initial rectangles. Otherwise a list of newly-constructed rectangles will be returned that covers the same area as the original two. This list will contain anywhere between 1 and 3 rectangles.

subtract

   @r = $rect->subtract( $other )

Returns a list of the non-overlapping regions covered by $rect but not by $other.

In the trivial case that $other completely covers $rect then the empty list is returned. In the trivial case that $other and $rect do not intersect then a list containing $rect is returned. Otherwise, a list of newly-constructed rectangles will be returned that covers the required area. This list will contain anywhere between 1 and 4 rectangles.

AUTHOR

Paul Evans <leonerd@leonerd.org.uk>