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Replace atan to atan2 for avoiding NaN

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sapics 2016-01-08 11:15:10 +09:00
parent 3c66c013d1
commit 5f876adc1c
1 changed files with 3 additions and 3 deletions
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6
src/path/Path.js
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@ -2836,10 +2836,10 @@ statics: {
var sin = Math.sin(phi), var sin = Math.sin(phi),
cos = Math.cos(phi), cos = Math.cos(phi),
tan = Math.tan(phi), tan = Math.tan(phi),
tx = -Math.atan(b * tan / a), tx = Math.atan2(b * tan, a),
ty = Math.atan(b / (tan * a)); ty = Math.atan2(b, tan * a);
// Due to symetry, we don't need to cycle through pi * n solutions: // Due to symetry, we don't need to cycle through pi * n solutions:
return [Math.abs(a * Math.cos(tx) * cos - b * Math.sin(tx) * sin), return [Math.abs(a * Math.cos(tx) * cos + b * Math.sin(tx) * sin),
Math.abs(b * Math.sin(ty) * cos + a * Math.cos(ty) * sin)]; Math.abs(b * Math.sin(ty) * cos + a * Math.cos(ty) * sin)];
}, },