Fix #1889: Add skill progress to overview

Adds a progress bar for each stat to show how close to level up you are.

src/PersonObjects/formulas/skill.ts

@@ -5,3 +5,37 @@ export function calculateSkill(exp: number, mult = 1): number {
 export function calculateExp(skill: number, mult = 1): number {
   return Math.exp((skill / mult + 200) / 32) - 534.6;
 }
+
+export function calculateSkillProgress(exp: number, mult = 1): ISkillProgress {
+  const currentSkill = calculateSkill(exp, mult);
+  const nextSkill = currentSkill + 1;
+  let baseExperience = calculateExp(currentSkill, mult);
+  if (baseExperience < 0) baseExperience = 0;
+  const nextExperience = calculateExp(nextSkill, mult)
+
+  return {
+    currentSkill,
+    nextSkill,
+    baseExperience,
+    experience: exp,
+    nextExperience,
+    progress: exp / nextExperience,
+  }
+}
+
+export interface ISkillProgress {
+  currentSkill: number;
+  nextSkill: number;
+  baseExperience: number;
+  experience: number;
+  nextExperience: number;
+  progress: number;
+}
+
+export function getEmptySkillProgress() {
+  return {
+    currentSkill: 0, nextSkill: 0,
+    baseExperience: 0, experience: 0, nextExperience: 0,
+    progress: 0,
+  };
+}