feat(web): show selected subdivisions

1 files changed, 19 insertions, 6 deletions

diff --git a/web/src/math/Ratio.ts b/web/src/math/Ratio.ts
index 4973ff4..d8e1149 100644
--- a/web/src/math/Ratio.ts
+++ b/web/src/math/Ratio.ts
@@ -3,15 +3,15 @@ export type RatioData = [numerator: number, denominator: number];
 
 /** Representation of a ratio for performing fractional artithmetic. */
 export default class Ratio {
-  private readonly _numerator: number;
-  private readonly _denominator: number;
+  readonly #numerator: number;
+  readonly #denominator: number;
 
   get numerator(): number {
-    return this._numerator;
+    return this.#numerator;
   }
 
   get denominator(): number {
-    return this._denominator;
+    return this.#denominator;
   }
 
   constructor(numerator: number, denominator: number) {
@@ -25,8 +25,8 @@ export default class Ratio {
       throw new RangeError("Ratio demnominator cannot be zero");
     }
 
-    this._numerator = numerator;
-    this._denominator = denominator;
+    this.#numerator = numerator;
+    this.#denominator = denominator;
   }
 
   multiplyRatio(other: Ratio): Ratio {
@@ -43,6 +43,19 @@ export default class Ratio {
     );
   }
 
+  add(other: Ratio): Ratio {
+    return new Ratio(
+      this.numerator * other.denominator + other.numerator * this.denominator,
+      this.denominator * other.denominator,
+    );
+  }
+
+  compare(other: Ratio): number {
+    const left = this.numerator * other.denominator;
+    const right = other.numerator * this.denominator;
+    return left < right ? -1 : left > right ? 1 : 0;
+  }
+
   toNumber(): number {
     return this.numerator / this.denominator;
   }