2015-11-19 15:40:59 -08:00
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package DDG::Goodie::ChordDiagrams;
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# ABSTRACT: For getting the fingering for chords on popular strings instruments
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use DDG::Goodie;
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use SVG;
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use JSON;
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# docs: http://search.cpan.org/~ronan/SVG-2.33/lib/SVG/Manual.pm
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2015-11-19 15:40:59 -08:00
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zci answer_type => "chord_diagrams";
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zci is_cached => 1;
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name "Chord";
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primary_example_queries "C ukulele chord", "F# minor guitar tab";
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secondary_example_queries "Ebmaj7 ukulele chord";
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description "Shows a tab representing the correct frets, for a given chord, on a given strings instrument";
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code_url "https://github.com/duckduckgo/zeroclickinfo-goodies/blob/master/lib/DDG/Goodie/Chord.pm";
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topics "music";
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category "reference";
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attribution github => ["http://github.com/gerhuyy", "gerhuyy"],
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web => ["http://charliethe.ninja", "charles-l"],
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github => ["http://github.com/charles-l", "charles-l"];
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triggers any => "chord", "tab";
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local $/;
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open(my $fh, '<', share('guitar.json'));
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my $json_text = <$fh>;
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my $new_chords = decode_json($json_text);
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# Store the instruments that the program will respond to, with a
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# list storing the note of each string in order. (Add one to note
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# for sharps, and subtract one for flats)
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my @instruments = (
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"guitar"
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);
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# create svg X for muted strings
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sub mk_x {
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my $svg = shift;
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my $x = shift;
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my $y = shift;
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my $size = shift;
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$svg->line(
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x1=>$x - $size/2,
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y1=>$y - $size/2,
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x2=>$x + $size/2,
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y2=>$y + $size/2,
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style=>{
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'stroke'=>'black',
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'stroke-width'=>'2'
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});
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$svg->line(
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x1=>$x - $size/2,
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y1=>$y + $size/2,
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x2=>$x + $size/2,
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y2=>$y - $size/2,
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style=>{
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'stroke'=>'black',
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'stroke-width'=>'2'
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});
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};
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2015-12-03 18:43:39 -08:00
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# Generate chord SVG
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sub gen_svg {
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my (%opts) = @_;
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my $svg = SVG->new(width=>$opts{"width"}, height=>$opts{"height"});
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my $top_pad = 30;
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$svg->line(
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x1=>0,
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y1=>$top_pad,
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x2=>$opts{"width"},
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y2=>$top_pad,
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style=>{
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'stroke'=>'black',
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'stroke-width'=>'4'
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});
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my $fret_dist = (($opts{"height"} - $top_pad) / ($opts{"frets"}));
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for (my $i = 0; $i < $opts{"frets"}; $i++) {
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$svg->line(
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x1=>0,
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y1=>$top_pad + 2 + $i * $fret_dist,
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x2=>$opts{"width"},
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y2=>$top_pad + 2 + $i * $fret_dist,
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style=>{
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'stroke'=>'black',
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'stroke-width'=>'2'
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});
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}
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for (my $i = 0; $i < $opts{"strings"}; $i++) {
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$svg->line(
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x1=>1 + $i * (($opts{"width"} - 2) / ($opts{"strings"} - 1)),
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y1=>$top_pad,
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x2=>1 + $i * (($opts{"width"} - 2) / ($opts{"strings"} - 1)),
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y2=>$opts{"height"},
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style=>{
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'stroke'=>'black',
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'stroke-width'=>'2'
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});
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}
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my $i = 0;
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my $p_dist = ($opts{"width"} - 2) / ($opts{"strings"} - 1);
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for my $p (@{$opts{"points"}}) {
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last if ($i >= $opts{"strings"});
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my $fill = 'black';
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$fill = 'none' if ($p == 0);
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if ($p == -1) {
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mk_x($svg,
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$i * $p_dist + 1,
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$top_pad - $fret_dist/2 + 1,
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10)
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} else {
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$svg->circle(
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cx=>$i * $p_dist + 1,
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cy=>$top_pad + $fret_dist * $p - $fret_dist/2 + 2,
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r=>5,
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style=>{
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'stroke'=>'black',
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'stroke-width'=>2,
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'fill'=>$fill
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});
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}
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$i++;
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}
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return $svg;
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};
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2015-11-03 15:54:45 -08:00
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# The input parser. Uses regex to find the key to put the chord in, and the
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# chord if they are conjoined.
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# Also greps through the input words, looking for matches within the
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# chords and instrument hashes
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sub items{
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my @words = split(" ", lc $_[0]);
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$_[0] = join("sharp", split("#", $_[0]));
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my ($temp, $key, $mod, $chord, $dom, $temp2) = /( |^)([a-g])(sharp|b|)(m|min|minor|M|maj|major|sus[24]|aug9?|)(5|7|9|11|13|)( |$)/i ;
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if(/( |^)(5|7|9)( |$)/i){
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($temp, $dom, $temp2) = /( |^)(5|7|9|11|13)( |$)/i;
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}
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if(/( |^)(5|7|9)th( |$)/i){
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($temp, $dom, $temp2) = /( |^)(5|7|9|11|13)th( |$)/i;
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}
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my %mod_hash = (sharp => 1, b => -1);
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if (defined $mod) {
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$mod = $mod_hash{$mod} || 0;
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}
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if(defined $chord && ($chord eq "m" || $chord =~ /(min|minor)/i)){
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$chord = "min";
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}elsif(defined $chord && ($chord eq "M" || $chord =~ /(maj|major)/i)){
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$chord = "maj";
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}elsif(defined $chord && $chord =~ /sus[24]/i){
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$chord = lc $chord;
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}elsif(defined $chord && $chord =~ /aug/i){
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$chord = lc $chord;
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}elsif($dom){
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$chord = "dominant";
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}else{
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$chord = "maj";
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};
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if(!$dom){
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$dom = "";
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};
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my $instr = grep(@instruments, @words);
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return $instr, $chord, uc $key, $mod, $dom;
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};
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sub get_chord {
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my $chord = shift;
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my $name = shift; # maj, 5, min, etc.
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foreach(@$new_chords) {
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if (grep(/^$chord$/, @{%$_{'root'}})) {
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foreach(@{%$_{'types'}}) {
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if(%$_{'name'} eq $name) {
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return(\@{%$_{'variations'}});
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}
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}
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}
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}
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return undef;
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};
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# Handle statement
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handle remainder => sub {
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my ($instr_name, $chord_name, $key_name, $mod, $dom) = items($_);
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if((defined $instr_name) && (defined $chord_name) && (defined $key_name)){
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my $strings = 6;
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my $length = 4;
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my $input = join(" ", (uc $key_name) . (($mod == -1)? "b" :(($mod == 1)? "#" : "" )), $chord_name . $dom, "guitar chord");
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if ($mod == -1) {
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$mod = 'b';
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} elsif ($mod == 1) {
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$mod = '#'
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} else {
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$mod = '';
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}
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my $r = get_chord($key_name . $mod, $chord_name . $dom);
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return if not defined $r;
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my @results = @{$r};
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@results = map {
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svg => gen_svg(
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'width'=>100,
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'height'=>120,
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'frets'=>$length,
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'strings'=>$strings,
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'points'=> $_,
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)->xmlify,
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}, @results;
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return 'chord_diagrams', structured_answer => {
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id => 'chord_diagrams',
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name => 'Music',
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data => \@results,
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templates => {
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detail => 0,
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item => 'base_item',
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options => {
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url => "www.google.com",
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content => 'DDH.chord_diagrams.detail'
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},
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variants => {
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tile => 'narrow'
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}
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},
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meta => {}
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};
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};
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return;
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};
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1;
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