Use math.radians and math.degrees

Many places in the library were doing radian to degree conversion
via the manual calculation.  Doing timeit benchmarks on my system, I
am able to get a 4x speedup by using math.degrees or math.radians
instead

pyqtgraph/Point.py

@@ -8,7 +8,6 @@ Distributed under MIT/X11 license. See license.txt for more information.
 from .Qt import QtCore
 from math import atan2, hypot, degrees
 
-
 class Point(QtCore.QPointF):
     """Extension of QPointF which adds a few missing methods."""
     

pyqtgraph/SRTTransform.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from math import atan2, pi
+from math import atan2, degrees
 from .Qt import QtCore, QtGui
 from .Point import Point
 import numpy as np
@@ -77,7 +77,7 @@ class SRTTransform(QtGui.QTransform):
         self._state = {
             'pos': Point(p1),
             'scale': Point(dp2.length(), dp3.length() * sy),
-            'angle': (atan2(dp2[1], dp2[0]) * 180. / pi) + da
+            'angle': degrees(atan2(dp2[1], dp2[0])) + da
         }
         self.update()
         

pyqtgraph/SRTTransform3D.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from math import atan2, pi
+from math import atan2, degrees
 from .Qt import QtCore, QtGui
 from .Vector import Vector
 from .Transform3D import Transform3D
@@ -165,7 +165,7 @@ class SRTTransform3D(Transform3D):
         sin = (r-r.T)[rInd] / (2. * sign * axis[axisInd])
         
         ## finally, we get the complete angle from arctan(sin/cos)
-        self._state['angle'] = atan2(sin, cos) * 180 / pi
+        self._state['angle'] = degrees(atan2(sin, cos))
         if self._state['angle'] == 0:
             self._state['axis'] = (0,0,1)
         

pyqtgraph/Vector.py

@@ -4,7 +4,7 @@ Vector.py -  Extension of QVector3D which adds a few missing methods.
 Copyright 2010  Luke Campagnola
 Distributed under MIT/X11 license. See license.txt for more information.
 """
-from math import acos
+from math import acos, degrees
 from .Qt import QtGui, QtCore, QT_LIB
 from . import functions as fn
 import numpy as np
@@ -89,11 +89,11 @@ class Vector(QtGui.QVector3D):
         if n1 == 0. or n2 == 0.:
             return None
         ## Probably this should be done with arctan2 instead..
-        ang = acos(fn.clip_scalar(QtGui.QVector3D.dotProduct(self, a) / (n1 * n2), -1.0, 1.0)) ### in radians
+        rads = acos(fn.clip_scalar(QtGui.QVector3D.dotProduct(self, a) / (n1 * n2), -1.0, 1.0)) ### in radians
 #        c = self.crossProduct(a)
 #        if c > 0:
 #            ang *= -1.
-        return ang * 180. / np.pi
+        return degrees(rads)
 
     def __abs__(self):
         return Vector(abs(self.x()), abs(self.y()), abs(self.z()))

pyqtgraph/functions.py

@@ -432,16 +432,16 @@ def makeArrowPath(headLen=20, headWidth=None, tipAngle=20, tailLen=20, tailWidth
     If *tailLen* is None, no tail will be drawn.
     """
     if headWidth is None:
-        headWidth = headLen * math.tan(tipAngle * 0.5 * math.pi / 180.)
+        headWidth = headLen * math.tan(math.radians(tipAngle * 0.5))
     path = QtGui.QPainterPath()
     path.moveTo(0,0)
     path.lineTo(headLen, -headWidth)
     if tailLen is None:
-        innerY = headLen - headWidth * math.tan(baseAngle * math.pi / 180.)
+        innerY = headLen - headWidth * math.tan(math.radians(baseAngle))
         path.lineTo(innerY, 0)
     else:
         tailWidth *= 0.5
-        innerY = headLen - (headWidth-tailWidth) * math.tan(baseAngle* math.pi / 180.)
+        innerY = headLen - (headWidth-tailWidth) * math.tan(math.radians(baseAngle))
         path.lineTo(innerY, -tailWidth)
         path.lineTo(headLen + tailLen, -tailWidth)
         path.lineTo(headLen + tailLen, tailWidth)

pyqtgraph/graphicsItems/CurvePoint.py

@@ -1,4 +1,4 @@
-from math import atan2, pi
+from math import atan2, degrees
 from ..Qt import QtGui, QtCore
 from . import ArrowItem
 from ..functions import clip_scalar
@@ -79,10 +79,10 @@ class CurvePoint(GraphicsObject):
             
         p1 = self.parentItem().mapToScene(QtCore.QPointF(x[i1], y[i1]))
         p2 = self.parentItem().mapToScene(QtCore.QPointF(x[i2], y[i2]))
-        ang = atan2(p2.y()-p1.y(), p2.x()-p1.x()) ## returns radians
+        rads = atan2(p2.y()-p1.y(), p2.x()-p1.x()) ## returns radians
         self.resetTransform()
         if self._rotate:
-            self.setRotation(180 + ang * (180. / pi))
+            self.setRotation(180 + degrees(rads))
         QtGui.QGraphicsItem.setPos(self, *newPos)
         return True
         

pyqtgraph/graphicsItems/InfiniteLine.py

@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-from math import atan2, pi
+from math import atan2, degrees
 from ..Qt import QtGui, QtCore
 from ..Point import Point
 from .GraphicsObject import GraphicsObject
@@ -360,7 +360,7 @@ class InfiniteLine(GraphicsObject):
         up = tr.map(Point(left, 1))
         dif = end - start
         length = Point(dif).length()
-        angle = atan2(dif.y(), dif.x()) * 180 / pi
+        angle = degrees(atan2(dif.y(), dif.x()))
         
         p.translate(start)
         p.rotate(angle)

pyqtgraph/graphicsItems/ROI.py

@@ -17,7 +17,7 @@ import numpy as np
 #from numpy.linalg import norm
 from ..Point import *
 from ..SRTTransform import SRTTransform
-from math import atan2, cos, sin, pi, sqrt, hypot
+from math import atan2, cos, sin, pi, sqrt, hypot, radians, degrees
 from .. import functions as fn
 from .GraphicsObject import GraphicsObject
 from .UIGraphicsItem import UIGraphicsItem
@@ -1524,7 +1524,7 @@ class Handle(UIGraphicsItem):
         devPos = dt.map(QtCore.QPointF(0,0))
         tr = QtGui.QTransform()
         tr.translate(devPos.x(), devPos.y())
-        tr.rotate(va * 180. / pi)
+        tr.rotate(degrees(va))
         
         return dti.map(tr.map(self.path))
         
@@ -1663,7 +1663,7 @@ class LineROI(ROI):
         d = pos2-pos1
         l = d.length()
         ang = Point(1, 0).angle(d)
-        ra = ang * pi / 180.
+        ra = radians(ang if ang is not None else 0.)
         c = Point(-width/2. * sin(ra), -width/2. * cos(ra))
         pos1 = pos1 + c
         
@@ -1673,9 +1673,6 @@ class LineROI(ROI):
         self.addScaleHandle([0.5, 1], [0.5, 0.5])
 
 
-        
-
-
 class MultiRectROI(QtGui.QGraphicsObject):
     r"""
     Chain of rectangular ROIs connected by handles.

pyqtgraph/graphicsItems/TargetItem.py

@@ -1,4 +1,4 @@
-from math import atan2, pi
+from math import atan2, pi, degrees
 
 from ..Qt import QtGui, QtCore
 from ..Point import Point
@@ -243,7 +243,7 @@ class TargetItem(UIGraphicsItem):
         tr = QtGui.QTransform()
         tr.translate(devPos.x(), devPos.y())
         va = atan2(v.y(), v.x())
-        tr.rotate(va * 180.0 / pi)
+        tr.rotate(degrees(va))
         tr.scale(self.scale, self.scale)
         return dti.map(tr.map(self._path))
 

pyqtgraph/graphicsItems/TextItem.py

@@ -1,4 +1,4 @@
-from math import pi, atan2
+from math import atan2, degrees
 from ..Qt import QtCore, QtGui
 from ..Point import Point
 from .. import functions as fn
@@ -208,7 +208,7 @@ class TextItem(GraphicsObject):
         angle = -self.angle
         if self.rotateAxis is not None:
             d = pt.map(self.rotateAxis) - pt.map(Point(0, 0))
-            a = atan2(d.y(), d.x()) * 180 / pi
+            a = degrees(atan2(d.y(), d.x()))
             angle += a
         t.rotate(angle)  
         self.setTransform(t)

pyqtgraph/opengl/GLViewWidget.py

@@ -5,7 +5,7 @@ import numpy as np
 from .. import Vector
 from .. import functions as fn
 import warnings
-from math import cos, sin, tan
+from math import cos, sin, tan, degrees, radians
 ##Vector = QtGui.QVector3D
 
 ShareWidget = None
@@ -184,7 +184,7 @@ class GLViewWidget(QtWidgets.QOpenGLWidget):
         nearClip = dist * 0.001
         farClip = dist * 1000.
 
-        r = nearClip * tan(fov * 0.5 * np.pi / 180.)
+        r = nearClip * tan(0.5 * radians(fov))
         t = r * h / w
 
         ## Note that X0 and width in these equations must be the values used in viewport
@@ -326,8 +326,8 @@ class GLViewWidget(QtWidgets.QOpenGLWidget):
             pos = center - self.opts['rotation'].rotatedVector( Vector(0,0,dist) )
         else:
             # using 'euler' rotation method
-            elev = self.opts['elevation'] * np.pi / 180
+            elev = radians(self.opts['elevation'])
-            azim = self.opts['azimuth'] * np.pi / 180
+            azim = radians(self.opts['azimuth'])
             pos = Vector(
                 center.x() + dist * cos(elev) * cos(azim),
                 center.y() + dist * cos(elev) * sin(azim),
@@ -388,7 +388,7 @@ class GLViewWidget(QtWidgets.QOpenGLWidget):
             cPos = self.cameraPosition()
             cVec = self.opts['center'] - cPos
             dist = cVec.length()  ## distance from camera to center
-            xDist = dist * 2. * tan(0.5 * self.opts['fov'] * np.pi / 180.)  ## approx. width of view at distance of center point
+            xDist = dist * 2. * tan(0.5 * radians(self.opts['fov']))  ## approx. width of view at distance of center point
             xScale = xDist / self.width()
             zVec = QtGui.QVector3D(0,0,1)
             xVec = QtGui.QVector3D.crossProduct(zVec, cVec).normalized()
@@ -409,9 +409,9 @@ class GLViewWidget(QtWidgets.QOpenGLWidget):
                 # apply translation
                 self.opts['center'] += scale_factor * (xv*-dx + yv*dy + zv*dz)
             else: # use default euler rotation method
-                elev = np.radians(self.opts['elevation'])
+                elev = radians(self.opts['elevation'])
-                azim = np.radians(self.opts['azimuth'])
+                azim = radians(self.opts['azimuth'])
-                fov = np.radians(self.opts['fov'])
+                fov = radians(self.opts['fov'])
                 dist = (self.opts['center'] - self.cameraPosition()).length()
                 fov_factor = tan(fov / 2) * 2
                 scale_factor = dist * fov_factor / self.width()
@@ -435,7 +435,7 @@ class GLViewWidget(QtWidgets.QOpenGLWidget):
             dist = ((pos-cam)**2).sum(axis=-1)**0.5
         else:
             dist = (pos-cam).length()
-        xDist = dist * 2. * tan(0.5 * self.opts['fov'] * np.pi / 180.)
+        xDist = dist * 2. * tan(0.5 * radians(self.opts['fov']))
         return xDist / self.width()
         
     def mousePressEvent(self, ev):