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pod::Prima::Region(3) User Contributed Perl Documentation pod::Prima::Region(3)

NAME

Prima::Region - generic shapes for clipping and hit testing

SYNOPSIS

   $empty = Prima::Region->new;
   $rect  = Prima::Region->new( rect => [ 10, 10, 20, 20 ]);
   $rect  = Prima::Region->new( box  => [ 10, 10, 10, 10 ]); # same
   $poly  = Prima::Region->new( polygon => [ 0, 0, 100, 0, 100, 100 ]);
   $bits  = Prima::Region->new( image => $image );
   $drawable-> region( $rect );
   my $rgn = $drawable->region;
   $rgn->image->save('region.png') if $rgn;

DESCRIPTION

The Prima::Region class is a descendant of the Prima::Component class. A Prima::Region object is a representation of a generic shape that can be applied to a drawable and checked whether points are within its boundaries.

API

Creates a new region object. If called without any options then the resulting region will be empty The following options can be used:
Creates a rectangular region with inclusive-inclusive coordinates.
box => [ X, Y, WIDTH, HEIGHT ]
Same as "rect" but using the box semantics.
Creates a polygon shape with vertices given in @POINTS, and using the optional fillMode ( see "fillMode" in Drawable ).
Creates a region from a 1-bit image. If the image contains no pixels that are set to 1, the resulting region is created as an empty region.
Paints the region on a newly created bitmap and returns it. By default, the region offset is not included.
Returns the (X,Y,WIDTH,HEIGHT) bounding box that encloses the smallest possible rectangle, or (0,0,0,0) if the region is empty.
Applies one of the following set operations to the region:
Makes a copy of the REGION
The resulting region is an intersection of the two regions.
The resulting region is a union of the two regions.
Performs XOR operation on the two regions.
The resulting region is a difference between the two regions.
Creates a duplicate region object
Returns a "Prima::array" object filled with 4-integer tuples, where each is a box defined as a (x,y,width,height) tuple.
Returns the system handle for the region
Returns true if the regions are equal, false otherwise.
Paints the region on a newly created image and returns it. By default, the region offset is not included.
Returns true if the region is empty, false otherwise.
Shifts the region vertically and/or horizontally
Returns true if the (X,Y) point is inside the region
Checks whether a rectangle given by the inclusive-inclusive coordinates is inside, outside, or partially covered by the region. The return value can be one of these flags: 

   rgn::Inside
   rgn::Outside
   rgn::Partially

where the "rgn::Outside" constant has the value of 0.

AUTHOR

Dmitry Karasik, <dmitry@karasik.eu.org>.

SEE ALSO

Prima, Prima::Drawable, Prima::Drawable::Path

2024-08-20 perl v5.40.0