add hyperbolic functions (#282)

* add hyperbolic functions
* changelog

Author: hroskes

CHANGELOG.rst

@@ -11,6 +11,7 @@
   `cache_get_size()` [hroskes]
 * don't generate docs for deprecated arguments [jcupitt]
 * buffer save tries with the target API first [jcupitt]
+* add hyperbolic functions `sinh`, `cosh`, `tanh`, `asinh`, `acosh`, `atanh`
 
 ## Version 2.1.15 (27 Dec 2020)
 

pyvips/enums.py

@@ -404,6 +404,18 @@ class OperationMath(object):
 
     ATAN (str): atan(), angles in degrees
 
+    SINH (str): sinh(), angles in radians
+
+    COSH (str): cosh(), angles in radians
+
+    TANH (str): tanh(), angles in radians
+
+    ASINH (str): asinh(), angles in radians
+
+    ACOSH (str): acosh(), angles in radians
+
+    ATANH (str): atanh(), angles in radians
+
     LOG (str): log base e
 
     LOG10 (str): log base 10
@@ -420,6 +432,12 @@ class OperationMath(object):
     ASIN = 'asin'
     ACOS = 'acos'
     ATAN = 'atan'
+    SINH = 'sinh'
+    COSH = 'cosh'
+    TANH = 'tanh'
+    ASINH = 'asinh'
+    ACOSH = 'acosh'
+    ATANH = 'atanh'
     LOG = 'log'
     LOG10 = 'log10'
     EXP = 'exp'

pyvips/vimage.py

@@ -1335,6 +1335,30 @@ def atan(self):
         """Return the inverse tangent of an image in degrees."""
         return self.math('atan')
 
+    def sinh(self):
+        """Return the hyperbolic sine of an image in radians."""
+        return self.math('sinh')
+
+    def cosh(self):
+        """Return the hyperbolic cosine of an image in radians."""
+        return self.math('cosh')
+
+    def tanh(self):
+        """Return the hyperbolic tangent of an image in radians."""
+        return self.math('tanh')
+
+    def asinh(self):
+        """Return the inverse hyperbolic sine of an image in radians."""
+        return self.math('asinh')
+
+    def acosh(self):
+        """Return the inverse hyperbolic cosine of an image in radians."""
+        return self.math('acosh')
+
+    def atanh(self):
+        """Return the inverse hyperbolic tangent of an image in radians."""
+        return self.math('atanh')
+
     def log(self):
         """Return the natural log of an image."""
         return self.math('log')