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Display weighted average of compatibility submissions (#78)

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BreadFish64 2018-03-18 20:22:51 -05:00 committed by Flame Sage
parent 8dd12e4204
commit 412a77d7c8
1 changed files with 13 additions and 1 deletions
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14
scripts/games/app.js
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@ -179,7 +179,19 @@ function processGame(game) {
model.testcase_date = "2000-01-01";
} else {
let recent = model.testcases[0];
model.compatibility = recent.compatibility;
// The displayed compatibility rating is an weighted arithmetic mean of the submitted ratings.
let numerator = 0;
let denominator = 0;
model.testcases.forEach(testcase => {
// Build date is a better metric but testcases from the TOML files only have a submission date.
let weigh_date = new Date(testcase.buildDate == undefined ? testcase.date : testcase.buildDate);
// The test case is weighted on an exponential decay curve such that a test case is half as relevant as each month (30 days) passes.
// The exponent is obtained by dividing the time in millisecond between the current date and date of testing by the number of milliseconds in 30 days (but negative because it's a decay).
let weight = Math.pow(.5, (currentDate - weigh_date) / -(30 * 1000 * 3600 * 24));
numerator += testcase.compatibility * weight;
denominator += weight;
});
model.compatibility = Math.round(numerator / denominator).toString();
model.testcase_date = recent.date;
}