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Bug 488418: Simplify kinetic averaging code, r=stuart

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This commit is contained in:
Mark Finkle 2009-04-15 01:51:10 -04:00
parent b3b7762080
commit 6297bd86f7
1 changed files with 7 additions and 14 deletions
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21
mobile/chrome/content/InputHandler.js
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@ -524,30 +524,23 @@ KineticData.prototype = {
if (mblen < 2) if (mblen < 2)
return false; return false;
let speedBufX = []; let tempX = 0;
let speedBufY = []; let tempY = 0;
// build arrays of each movement's speed in pixels/ms // build arrays of each movement's speed in pixels/ms
let prev = mb[0]; let prev = mb[0];
for (let i = 1; i < mblen; i++) { for (let i = 1; i < mblen; i++) {
let me = mb[i]; let me = mb[i];
let speedX = (me.sx - prev.sx) / (me.t - prev.t); tempX += (me.sx - prev.sx) / (me.t - prev.t);
speedBufX.push(speedX); tempY += (me.sy - prev.sy) / (me.t - prev.t);
let speedY = (me.sy - prev.sy) / (me.t - prev.t);
speedBufY.push(speedY);
prev = me; prev = me;
} }
function average(buf) { // average the speeds out (this could probably be a bit smarter)
return buf.reduce(function(a,b) a+b) / buf.length; this.speedX = tempX / mblen;
} this.speedY = tempY / mblen;
// average the speeds out (This could probably be a bit smarter)
this._speedX = average(speedBufX);
this._speedY = average(speedBufY);
// fire off our kinetic timer which will do all the work // fire off our kinetic timer which will do all the work
this._startKineticTimer(); this._startKineticTimer();