Kevin-Mok/spotify-lib-vis
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Fix floating point precision issue in audio feat

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The last commit (fc6c30ec32) was affected
by a floating point addition/subtraction precision bug. The bug caused
nonsensical categories to appear on the audio feature bar charts. Now
fixed.
This commit is contained in:
Chris Shyi
2018-06-30 18:51:52 -04:00
parent fc6c30ec32
commit 01759c59b3
2 changed files with 23 additions and 13 deletions
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22
graphs/static/graphs/scripts/audio_feat_graph.js
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@@ -20,9 +20,9 @@ function drawAudioFeatGraph(audioFeature, intervalEndPoints, parentElem, userSec
let featureData = {};
let currentEndPoint = intervalEndPoints.begin; // start at beginning
// Create the keys first in order
while (currentEndPoint !== intervalEndPoints.end) {
while (currentEndPoint < intervalEndPoints.end) {
let startOfRange = currentEndPoint;
let endOfRange = startOfRange + intervalEndPoints.step;
let endOfRange = precise(startOfRange + intervalEndPoints.step);
let key = `${startOfRange} ~ ${endOfRange}`;
featureData[key] = 0;
@@ -40,13 +40,14 @@ function drawAudioFeatGraph(audioFeature, intervalEndPoints, parentElem, userSec
// categorize the data points
for (let dataPoint of response.data_points) {
dataPoint = parseFloat(dataPoint);
let currLowerBound = intervalEndPoints.end - intervalEndPoints.step;
let currLowerBound = precise(intervalEndPoints.end - intervalEndPoints.step);
let stepSize = intervalEndPoints.step;
// find the index of the first element greater than dataPoint
while (dataPoint < currLowerBound) {
currLowerBound -= stepSize;
while (dataPoint < currLowerBound && currLowerBound >= intervalEndPoints.begin) {
currLowerBound = precise(currLowerBound - stepSize);
}
let upperBound = currLowerBound + stepSize;
let upperBound = precise(currLowerBound + stepSize);
currLowerBound = precise(currLowerBound);
let key = `${currLowerBound} ~ ${upperBound}`;
featureData[key] += 1;
}
@@ -113,4 +114,13 @@ function drawAudioFeatGraph(audioFeature, intervalEndPoints, parentElem, userSec
*/
function capFeatureStr(audioFeature) {
return audioFeature.charAt(0).toUpperCase() + audioFeature.slice(1);
}
/**
* Converts a number to a floating point value with 2 significant figures
* @param number: the number to be converted
* @returns the input converted to two significant digits
*/
function precise(number) {
return Number.parseFloat(number.toPrecision(2));
}