摘要

许可协议

本作品已被作者Qef释出到公有领域。这适用于全世界。 在一些国家这可能不合法；如果是这样的话，那么： Qef无条件地授予任何人以任何目的使用本作品的权利，除非这些条件是法律规定所必需的。

Source code

This graph was generated by the Perl program below, which was specially written for the purpose. If changes need to be made, it's probably best to tweak the program and re-run it to get a new version, rather than editing the SVG directly.

use warnings;
use strict;

# The E12 series twice over, the first time divided by 10.
my @VALUES = qw(
    1.0 1.2 1.5 1.8 2.2 2.7 3.3 3.9 4.7 5.6 6.8 8.2
    10  12  15  18  22  27  33  39  47  56  68  82
);

# Parameters to set appearance.
my $AXIS_HT = 400;
my $VERT_SCALE = 4.5;
my $BAR_WIDTH = 20;
my $BAR_GAP = 3;
my $MARGIN = 10;

my $img_wd = ($BAR_WIDTH + $BAR_GAP) * @VALUES + $BAR_GAP + 2 * $MARGIN;
my $img_ht = $AXIS_HT + 2 * $MARGIN;
my $margin_right = $img_wd - $MARGIN;
my $margin_bottom = $img_ht - $MARGIN;

my $x = $MARGIN;
my $graph_path = '';
my $text_cmds = '';
for (@VALUES) {
    $x += $BAR_GAP;
    my $bar_ht = $_ * $VERT_SCALE;
    $graph_path .= "M$x,$margin_bottom v-$bar_ht h$BAR_WIDTH v$bar_ht Z\n";
    $x += $BAR_WIDTH;
    my $bar_top = $img_ht - $bar_ht - $MARGIN + -5;
    my $txt_x = $x - 0.5 * $BAR_WIDTH + 4.5;
    $text_cmds .= "  <text transform='translate($txt_x,$bar_top) rotate(270)'" .
                  " x='0' y='0' fill='#000' text-anchor='start'>$_</text>\n";
}

print <<"END";
<?xml version="1.0" encoding="UTF-8"?>
<svg version="1.0" width="$img_wd" height="$img_ht"
     xmlns="http://www.w3.org/2000/svg">

 <defs>
  <linearGradient id="grad" x2="0%" y1="0%" y2="100%">
   <stop offset="5%" stop-color="#F00" />
   <stop offset="95%" stop-color="#F90" />
  </linearGradient>
 </defs>

 <path stroke="#000" stroke-width="1" fill="none"
       d="M$MARGIN,$MARGIN V$margin_bottom H$margin_right"/>
 <path stroke="#000" stroke-width="0.6" fill="url(#grad)" d="$graph_path"/>
 <path stroke="#333" stroke-width="0.6" fill="url(#grad)" d="$graph_path">
 </g>
</svg>
END