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Fix Phaser.Line.intersectsPoints for floating point inaccuracy. Round the result to 3 decimals, should be enough precision and solves the problems.

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See: http://www.html5gamedevs.com/topic/6840-phaserlineintersects-does-not-work-for-floats/
This commit is contained in:
Wouter Commandeur 2014-05-31 12:13:59 +02:00
parent 1e9d0b2438
commit 266eb10765
1 changed files with 7 additions and 2 deletions
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9
src/geom/Line.js
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@ -375,8 +375,13 @@ Phaser.Line.intersectsPoints = function (a, b, e, f, asSegment, result) {
return null;
}
result.x = ((b1 * c2) - (b2 * c1)) / denom;
result.y = ((a2 * c1) - (a1 * c2)) / denom;
/*
Round to 3 decimals here, due to javascript floating point is 'broken'
http://stackoverflow.com/questions/11832914/round-to-at-most-2-decimal-places-in-javascript
See workaround explanation there in accepted answer there..
*/
result.x = Math.round( ((((b1 * c2) - (b2 * c1)) / denom)+0.00001)*1000 ) / 1000;
result.y = Math.round( ((((a2 * c1) - (a1 * c2)) / denom)+0.00001)*1000 ) / 1000;
if (asSegment)
{