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std.math: add degreesToRadians and radiansToDegrees

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frmdstryr 2022-07-11 09:40:05 -04:00 committed by GitHub
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commit 3e2e6c108a
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lib/std/math.zig
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@ -292,6 +292,34 @@ pub inline fn tan(value: anytype) @TypeOf(value) {
return @tan(value);
}
// Convert an angle in radians to degrees. T must be a float type.
pub fn radiansToDegrees(comptime T: type, angle_in_radians: T) T {
if (@typeInfo(T) != .Float)
@compileError("T must be a float type.");
return angle_in_radians * 180.0 / pi;
}
test "radiansToDegrees" {
try std.testing.expectApproxEqAbs(@as(f32, 0), radiansToDegrees(f32, 0), 1e-6);
try std.testing.expectApproxEqAbs(@as(f32, 90), radiansToDegrees(f32, pi / 2.0), 1e-6);
try std.testing.expectApproxEqAbs(@as(f32, -45), radiansToDegrees(f32, -pi / 4.0), 1e-6);
try std.testing.expectApproxEqAbs(@as(f32, 180), radiansToDegrees(f32, pi), 1e-6);
try std.testing.expectApproxEqAbs(@as(f32, 360), radiansToDegrees(f32, 2.0 * pi), 1e-6);
}
// Convert an angle in degrees to radians. T must be a float type.
pub fn degreesToRadians(comptime T: type, angle_in_degrees: T) T {
if (@typeInfo(T) != .Float)
@compileError("T must be a float type.");
return angle_in_degrees * pi / 180.0;
}
test "degreesToRadians" {
try std.testing.expectApproxEqAbs(@as(f32, pi / 2.0), degreesToRadians(f32, 90), 1e-6);
try std.testing.expectApproxEqAbs(@as(f32, -3 * pi / 2.0), degreesToRadians(f32, -270), 1e-6);
try std.testing.expectApproxEqAbs(@as(f32, 2 * pi), degreesToRadians(f32, 360), 1e-6);
}
/// Base-e exponential function on a floating point number.
/// Uses a dedicated hardware instruction when available.
/// This is the same as calling the builtin @exp