Graphics::Grid::Viewport - Viewport
version 0.001
use Graphics::Grid::Viewport; use Graphics::Grid::GPar; my $vp = Graphics::Grid::Viewport->new( x => 0.6, y => 0.6, width => 1, height => 1, angle => 45, gp => Graphics::Grid::GPar->new(col => "red") );
Viewports describe rectangular regions on a graphics device and define a number of coordinate systems within those regions.
A Grahpics::Grid::Unit object specifying x-location.
Default to unit(0.5, "npc").
unit(0.5, "npc")
A Grahpics::Grid::Unit object specifying y-location.
The reference point is the left-bottom of parent viewport.
A Grahpics::Grid::Unit object specifying width.
Default to unit(1, "npc").
unit(1, "npc")
Similar to the width attribute except that it is for height.
width
The justification of the object, which consumes this role, relative to its (x, y) location.
The value is an arrayref in the form of [$hjust, $vjust], where $hjust and $vjust are two numbers for horizontal and vertical justification respectively. Each number is usually from 0 to 1, but can also beyond hat range. 0 means left alignment and 1 means right alighment.
[$hjust, $vjust]
Default is [0.5, 0.5], which means the object's center is aligned to its (x, y) position.
[0.5, 0.5]
For example, for a rectangle which has $width and $height, and positioned at ($x, $y), the position of its left-bottom corner can be calculated in this way,
$left = $x - $hjust * $width; $bottom = $y - $vjust * $height;
This attribute also supports some string values. They map to numeric values like below.
string numeric --------------------------- ------------ left [ 0, 0.5 ] top [ 0.5, 1 ] right [ 1, 0.5 ] bottom [ 0.5, 0 ] center | centre [ 0.5, 0.5 ] bottom_left | left_bottom [ 0, 0 ] top_left | left_top [ 0, 1 ] bottom_right | right_bottom [ 1, 0 ] top_right | right_top [ 1, 1 ]
A reader accessor for the horizontal justification.
A reader accessor for vertical justification.
An object of Graphics::Grid::GPar. Default is an empty gpar object.
A numeric array ref of length two indicating the minimum and maximum on the x-scale. The limits may not be identical.
Default is [0, 1].
[0, 1]
A numeric array ref of length two indicating the minimum and maximum on the y-scale. The limits may not be identical.
A numeric value indicating the angle of rotation of the viewport. Positive values indicate the amount of rotation, in degrees, anticlockwise from the positive x-axis. Default is 0.
A Graphics::Grid::Layout object which splits the viewport into subregions.
Indices of rows occupied by this viewport in its parent's layout.
Indices of columns occupied by this viewport in its parent's layout.
A string to uniquely identify the viewport once it has been pushed onto the viewport tree. If not specified, it would be assigned automatically.
Graphics::Grid
Graphics::Grid::ViewportLike
Stephan Loyd <sloyd@cpan.org>
This software is copyright (c) 2018-2023 by Stephan Loyd.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
To install Graphics::Grid, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Graphics::Grid
CPAN shell
perl -MCPAN -e shell install Graphics::Grid
For more information on module installation, please visit the detailed CPAN module installation guide.