#! /usr/bin/perl -T use strict; use warnings; use GD; use POSIX; use Time::Zone; sub blendpx { my ($gd, $x, $y, $r, $g, $b, $frac) = @_; my ($ro, $go, $bo) = $gd->rgb($gd->getPixel($x, $y)); # workaround for icky 256-color graphs # $frac = int($frac * 32) / 32; my $rn = $ro * (1.0 - $frac) + $r * $frac; my $gn = $go * (1.0 - $frac) + $g * $frac; my $bn = $bo * (1.0 - $frac) + $b * $frac; $gd->setPixel($x, $y, $gd->colorResolve($rn, $gn, $bn)); } # Standard implementation of Wu's antialiased line algorithm. sub wuline { my ($gd, $x1, $y1, $x2, $y2, $r, $g, $b, $a) = @_; $x1 = POSIX::floor($x1); $x2 = POSIX::floor($x2); $y1 = POSIX::floor($y1); $y2 = POSIX::floor($y2); if (abs($x2 - $x1) > abs($y2 - $y1)) { # x-directional if ($y2 < $y1) { ($x2, $y2, $x1, $y1) = ($x1, $y1, $x2, $y2); } my $y = POSIX::floor($y1); my $frac = $y1 - $y; my $dx = ($x2 > $x1) ? 1 : -1; my $dy = ($y2 - $y1) / abs($x2 - $x1); for (my $x = $x1; $x != $x2 + $dx; $x += $dx) { blendpx($gd, $x, $y, $r, $g, $b, $a * (1.0 - $frac)); blendpx($gd, $x, $y + 1, $r, $g, $b, $a * $frac); $frac += $dy; if ($frac > 1) { $frac -= 1; ++$y; } } } else { # y-directional if ($x2 < $x1) { ($x2, $y2, $x1, $y1) = ($x1, $y1, $x2, $y2); } my $x = POSIX::floor($x1); my $frac = $x1 - $x; my $dy = ($y2 > $y1) ? 1 : -1; my $dx = ($x2 - $x1) / abs($y2 - $y1); for (my $y = $y1; $y != $y2 + $dy; $y += $dy) { blendpx($gd, $x, $y, $r, $g, $b, $a * (1.0 - $frac)); blendpx($gd, $x + 1, $y, $r, $g, $b, $a * $frac); $frac += $dx; if ($frac > 1) { $frac -= 1; ++$x; } } } } sub makegraph { my $xoffset = 70; my ($width, $height, $min_x, $max_x, $min_y, $max_y, $tickgran) = @_; # Create our base graph my $graph = new GD::Image($width, $height, 1); my $white = $graph->colorAllocate(255, 255, 255); my $gray = $graph->colorAllocate(230, 230, 255); my $black = $graph->colorAllocate(0, 0, 0); # $graph->fill(0, 0, $white); $graph->filledRectangle(0, 0, $width, $height, $white); # seems to work better $::xs = ($width - ($xoffset+2)) / ($max_x - $min_x); $::ys = ($height - 33) / ($min_y - $max_y); # Hour marks for my $i ($xoffset+1..$width-2) { if (((($i-($xoffset+1)) / $::xs + $min_x) / 3600) % 2 == 1) { $graph->line($i, 0, $i, $height - 1, $gray); } } # Hour text for my $i (0..23) { my @bounds = GD::Image::stringFT(undef, $black, "/usr/share/fonts/truetype/msttcorefonts/Arial.ttf", 10, 0, 0, 0, $i); my $w = $bounds[2] - $bounds[0]; # Determine where the center of this will be my $starthour = POSIX::fmod(($min_x + Time::Zone::tz_local_offset()) / 3600, 24); my $diff = POSIX::fmod($i - $starthour + 24, 24); my $center = ($diff * 3600 + 1800) * $::xs; next if ($center - $w / 2 < 1 || $center + $w / 2 > $width - ($xoffset+2)); $graph->stringFT($black, "/usr/share/fonts/truetype/msttcorefonts/Arial.ttf", 10, 0, $xoffset + $center - $w / 2, $height - 6, $i); } # # Y lines; we want max 11 of them (zero-line, plus five on each side, or # whatever) but we don't want the ticks to be on minimum 50 (or # whatever $tickgran is set to). However, if there would be # really really few lines, go down an order of magnitude and try # again. # my $ytick; do { $ytick = ($max_y - $min_y) / 11; $ytick = POSIX::ceil($ytick / $tickgran) * $tickgran; $tickgran *= 0.1; } while (($max_y - $min_y) / $ytick < 4); for my $i (-11..11) { my $y = ($i * $ytick - $max_y) * $::ys + 10; next if ($y < 2 || $y > $height - 18); if ($i == 0) { wuline($graph, $xoffset, $y, $width - 1, $y, 0, 0, 0, 1.0); wuline($graph, $xoffset, $y + 1, $width - 1, $y + 1, 0, 0, 0, 1.0); } else { wuline($graph, $xoffset, $y, $width - 1, $y, 0, 0, 0, 0.2); } # text my $traf = 8 * ($i * $ytick); my $text; if ($traf >= 500_000_000) { $text = (sprintf "%.1f Gbit", ($traf/1_000_000_000)); } elsif ($traf >= 500_000) { $text = (sprintf "%.1f Mbit", ($traf/1_000_000)); } else { $text = (sprintf "%.1f kbit", ($traf/1_000)); } my @bounds = GD::Image::stringFT(undef, $black, "/usr/share/fonts/truetype/msttcorefonts/Arial.ttf", 10, 0, 0, 0, $text); my $w = $bounds[2] - $bounds[0]; my $h = $bounds[1] - $bounds[5]; next if ($y - $h/2 < 2 || $y + $h/2 > $height - 12); $graph->stringFT($black, "/usr/share/fonts/truetype/msttcorefonts/Arial.ttf", 10, 0, ($xoffset - 4) - $w, $y + $h/2, $text); } # Nice border(TM) $graph->rectangle($xoffset, 0, $width - 1, $height - 1, $black); return $graph; } sub plotseries { my ($graph, $xvals, $yvals, $r, $g, $b, $min_x, $max_y) = @_; my $xoffset = 70; my @xvals = @{$xvals}; my @yvals = @{$yvals}; my $x = $xvals[0]; my $y = $yvals[0]; for my $i (1..$#xvals) { next if ($::xs * ($xvals[$i] - $x) < 2 && $::ys * ($yvals[$i] - $y) > -2); wuline($graph, ($x-$min_x) * $::xs + $xoffset + 1, ($y-$max_y) * $::ys + 10, ($xvals[$i]-$min_x) * $::xs + $xoffset + 1, ($yvals[$i]-$max_y) * $::ys + 10, $r, $g, $b, 1.0); $x = $xvals[$i]; $y = $yvals[$i]; } } 1;