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Get all y values in one go

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This commit is contained in:
Jordan Eldredge 2018-11-04 21:26:28 -08:00
parent 3b7f2d51ac
commit 94476eedc4
2 changed files with 9 additions and 3 deletions
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4
js/components/EqualizerWindow/EqGraph.js
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@ -89,12 +89,12 @@ class EqGraph extends React.Component {
ys.push(percentToRange(percent, min, max));
});
const getY = spline(xs, ys);
const allYs = spline(xs, ys);
const maxX = xs[xs.length - 1];
let lastY = ys[0];
for (let x = 0; x <= maxX; x++) {
const y = clamp(Math.round(getY(x)), 0, GRAPH_HEIGHT - 1);
const y = clamp(Math.round(allYs[x]), 0, GRAPH_HEIGHT - 1);
const yTop = Math.min(y, lastY);
const height = 1 + Math.abs(lastY - y);
this.canvasCtx.fillRect(paddingLeft + x, yTop, 1, height);

8
js/components/EqualizerWindow/spline.js
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@ -5,7 +5,7 @@ export default function spline(xs, ys) {
return 0;
});
ks = getNaturalKs(xs, ys, ks);
return x => {
const getY = x => {
let i = 1;
while (xs[i] < x) i++;
const t = (x - xs[i - 1]) / (xs[i] - xs[i - 1]);
@ -15,6 +15,12 @@ export default function spline(xs, ys) {
(1 - t) * ys[i - 1] + t * ys[i] + t * (1 - t) * (a * (1 - t) + b * t);
return q;
};
const maxX = xs[xs.length - 1];
const allYs = [];
for (let i = 0; i <= maxX; i++) {
allYs.push(getY(i));
}
return allYs;
}
function getNaturalKs(xs, ys, ks) {