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package SVG::Estimate::Circle; |
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$SVG::Estimate::Circle::VERSION = '1.0113'; |
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use Moo; |
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use Math::Trig qw/pi/; |
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extends 'SVG::Estimate::Shape'; |
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with 'SVG::Estimate::Role::MakePolygon'; |
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with 'SVG::Estimate::Role::ArgsWithUnits'; |
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=head1 NAME |
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SVG::Estimate::Circle - Handles estimating circles. |
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=head1 VERSION |
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version 1.0113 |
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=head1 SYNOPSIS |
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my $circle = SVG::Estimate::Circle->new( |
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transformer => $transform, |
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start_point => [45,13], |
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cx => 1, |
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cy => 3, |
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r => 1, |
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); |
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my $length = $circle->length; |
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=head1 INHERITANCE |
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This class extends L. |
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=head1 METHODS |
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=head2 new() |
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Constructor. |
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=over |
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=item cx |
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Float representing center x. |
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=item cy |
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Float representing center y. |
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=item r |
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Float representing the radius. |
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=back |
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=cut |
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has cx => ( |
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is => 'ro', |
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default => sub { 0 }, |
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); |
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has cy => ( |
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is => 'ro', |
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default => sub { 0 }, |
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); |
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has r => ( |
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is => 'ro', |
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required => 1, |
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); |
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sub args_with_units { |
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0
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return qw/r/; |
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} |
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sub BUILDARGS { |
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my ($class, @args) = @_; |
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##Upgrade to hashref |
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my $args = @args % 2 ? $args[0] : { @args }; |
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$args->{cx} //= 0; |
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$args->{cy} //= 0; |
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my $center = [ $args->{cx}, $args->{cy} ]; |
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if ($args->{transformer}->has_transforms) { |
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##Approximate the circle with a polygon |
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my $poly = $class->make_polygon($args); |
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$args->{draw_start} = $poly->draw_start; |
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$args->{draw_end} = $poly->draw_end; |
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$args->{shape_length} = $poly->shape_length; |
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$args->{min_x} = $poly->min_x; |
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$args->{min_y} = $poly->min_y; |
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$args->{max_x} = $poly->max_x; |
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$args->{max_y} = $poly->max_y; |
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return $args; |
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} |
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$args->{draw_start} = [$args->{cx}+$args->{r}, $args->{cy}]; |
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$args->{draw_end} = $args->{draw_start}; |
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$args->{shape_length} = 2 * pi * $args->{r}; |
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$args->{min_x} = $args->{cx} - $args->{r}; |
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$args->{min_y} = $args->{cy} - $args->{r}; |
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$args->{max_x} = $args->{cx} + $args->{r}; |
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$args->{max_y} = $args->{cy} + $args->{r}; |
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return $args; |
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} |
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=head2 this_point ($args, $t) |
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This class method is used to calculate a point on a circle, given it's relative position (C<$t>, ranging |
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from 0 to 1, inclusive), and the radius and center of the circle from a hashref of C<$args> (C and C and ). |
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=cut |
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sub this_point { |
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my $class = shift; |
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my $args = shift; |
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my $t = shift; |
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my $angle = $t * 2 * pi; |
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my $cosr = cos $angle; |
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my $sinr = sin $angle; |
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my $x = $cosr * $args->{r} + $args->{cx}; |
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my $y = $sinr * $args->{r} + $args->{cy}; |
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return [$x, $y]; |
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} |
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1; |