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3bb0032cd6
rsc's algorithm - applied gofmt -w misc src - partial CL (last chunk) R=rsc, r http://go/go-review/1024041
27 lines
542 B
Go
27 lines
542 B
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package math
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// Atan returns the arc tangent of y/x, using
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// the signs of the two to determine the quadrant
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// of the return value.
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func Atan2(x, y float64) float64 {
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// Determine the quadrant and call atan.
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if x+y == x {
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if x >= 0 {
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return Pi / 2
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}
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return -Pi / 2;
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}
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q := Atan(x / y);
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if y < 0 {
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if q <= 0 {
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return q + Pi
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}
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return q - Pi;
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}
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return q;
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}
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