This is an entity with height and width. Attributes (x, y) is one corner of the rect, whereas (x+w,y+h) is the opposite corner.

Width and height of the rectangle.

Anything in Collision::2D::Entity.

See Collision::2D::Entity->collide

 print 'boom' if $rect->collide($rect);
 print 'zing' if $rect->collide($circle);
 print 'yotz' if $rect->collide($grid);

See Collision::2D::Entity->intersect

 print 'bam' if $rect->intersect($rect);
 # etc..