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69 lines
1.6 KiB
69 lines
1.6 KiB
// Scaling Variables
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$golden: 1.618;
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$minor-second: 1.067;
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$major-second: 1.125;
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$minor-third: 1.2;
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$major-third: 1.25;
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$perfect-fourth: 1.333;
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$augmented-fourth: 1.414;
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$perfect-fifth: 1.5;
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$minor-sixth: 1.6;
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$major-sixth: 1.667;
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$minor-seventh: 1.778;
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$major-seventh: 1.875;
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$octave: 2;
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$major-tenth: 2.5;
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$major-eleventh: 2.667;
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$major-twelfth: 3;
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$double-octave: 4;
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$modular-scale-ratio: $perfect-fourth !default;
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$modular-scale-base: em($em-base) !default;
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@function modular-scale($increment, $value: $modular-scale-base, $ratio: $modular-scale-ratio) {
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$v1: nth($value, 1);
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$v2: nth($value, length($value));
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$value: $v1;
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// scale $v2 to just above $v1
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@while $v2 > $v1 {
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$v2: ($v2 / $ratio); // will be off-by-1
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}
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@while $v2 < $v1 {
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$v2: ($v2 * $ratio); // will fix off-by-1
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}
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// check AFTER scaling $v2 to prevent double-counting corner-case
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$double-stranded: $v2 > $v1;
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@if $increment > 0 {
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@for $i from 1 through $increment {
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@if $double-stranded and ($v1 * $ratio) > $v2 {
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$value: $v2;
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$v2: ($v2 * $ratio);
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} @else {
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$v1: ($v1 * $ratio);
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$value: $v1;
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}
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}
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}
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@if $increment < 0 {
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// adjust $v2 to just below $v1
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@if $double-stranded {
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$v2: ($v2 / $ratio);
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}
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@for $i from $increment through -1 {
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@if $double-stranded and ($v1 / $ratio) < $v2 {
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$value: $v2;
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$v2: ($v2 / $ratio);
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} @else {
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$v1: ($v1 / $ratio);
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$value: $v1;
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}
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}
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}
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@return $value;
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}
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