Created
July 17, 2011 17:52
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use strict; | |
use warnings; | |
my @data = ( | |
{end => 1000, duration => 100, records => 100}, | |
{end => 1600, duration => 300, records => 400}, | |
{end => 1200, duration => 150, records => 50}, | |
{end => 1300, duration => 500, records => 900}, | |
); | |
my $time_start = 500; | |
my $time_end = 2500; | |
my $xy = make_plot(\@data, $time_start, $time_end); | |
use Data::Dumper; | |
warn Dumper $xy; | |
sub make_plot { | |
my $data = shift(); | |
my $start_time = shift; | |
my $end_time = shift; | |
my @jumps; | |
foreach my $datum (@$data) { | |
my $rec_per_time = $datum->{records} / ($datum->{duration} || 1); | |
my $end = $datum->{end}; | |
my $start = $end - $datum->{duration}; | |
$start-- if $start == $end; # for 0-time periods... | |
push @jumps, {when => $start, diff => $rec_per_time}, | |
{when => $end, diff => -$rec_per_time}; | |
} | |
@jumps = sort { $a->{when} <=> $b->{when} } @jumps; | |
my $y = 0; | |
while (@jumps && $jumps[0]->{when} < $start_time) { | |
$y += shift(@jumps)->{diff}; # here's the non-OO hacky variant just for you >:) | |
} | |
# start collecting points for plotting | |
my @plot_coords; # to contain arrayrefs of [$x, $y] | |
push @plot_coords, [$start_time, $y]; # start point | |
while (@jumps) { | |
my $j = shift @jumps; | |
last if $j->{when} > $end_time; | |
push @plot_coords, [$j->{when}, $y]; | |
$y += $j->{diff}; | |
push @plot_coords, [$j->{when}, $y]; | |
} | |
push @plot_coords, [$end_time, $y]; | |
return \@plot_coords; | |
} |
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