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.\" ========================================================================
.\"
.IX Title "Tickit::RectSet 3pm"
.TH Tickit::RectSet 3pm "2018-11-01" "perl v5.28.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
"Tickit::RectSet" \- store a set of rectangular regions
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Objects in this class store a set of rectangular regions. The object tracks
which areas are covered, to ensure that overlaps are avoided, and that
neighbouring regions are merged where possible. The order in which they are
added is not important.
.PP
New regions can be added using the \f(CW\*(C`add\*(C'\fR method. The \f(CW\*(C`rects\*(C'\fR method returns
a list of non-overlapping Tickit::Rect regions, in top-to-bottom,
left-to-right order.
.SH "CONSTRUCTOR"
.IX Header "CONSTRUCTOR"
.SS "new"
.IX Subsection "new"
.Vb 1
\&   $rectset = Tickit::RectSet\->new
.Ve
.PP
Returns a new \f(CW\*(C`Tickit::RectSet\*(C'\fR instance, initially empty.
.SH "METHODS"
.IX Header "METHODS"
.SS "rects"
.IX Subsection "rects"
.Vb 1
\&   @rects = $rectset\->rects
.Ve
.PP
Returns a list of the covered regions, in order first top to bottom, then left
to right.
.SS "add"
.IX Subsection "add"
.Vb 1
\&   $rectset\->add( $rect )
.Ve
.PP
Adds the region covered by \f(CW$rect\fR to the stored region list.
.SS "subtract"
.IX Subsection "subtract"
.Vb 1
\&   $rectset\->subtract( $rect )
.Ve
.PP
Removes any covered region that intersects with \f(CW$rect\fR from the stored
region list.
.SS "clear"
.IX Subsection "clear"
.Vb 1
\&   $rectset\->clear
.Ve
.PP
Remove all the regions from the set.
.SS "intersects"
.IX Subsection "intersects"
.Vb 1
\&   $bool = $rectset\->intersects( $rect )
.Ve
.PP
Returns true if \f(CW$rect\fR intersects with any region in the set.
.SS "contains"
.IX Subsection "contains"
.Vb 1
\&   $bool = $rectset\->contains( $rect )
.Ve
.PP
Returns true if \f(CW$rect\fR is entirely covered by the regions in the set. Note
that it may be that the rect requires two or more regions in the set to
completely cover it.
.SH "AUTHOR"
.IX Header "AUTHOR"
Paul Evans <leonerd@leonerd.org.uk>