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Commit6a5fd7b

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polar: Clarify some of the documenting comments on transforms
1 parentc1fc073 commit6a5fd7b

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+38
-43
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1 file changed

+38
-43
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‎lib/matplotlib/projections/polar.py

Lines changed: 38 additions & 43 deletions
Original file line numberDiff line numberDiff line change
@@ -839,8 +839,11 @@ def _init_axis(self):
839839
self.spines['polar'].register_axis(self.yaxis)
840840

841841
def_set_lim_and_transforms(self):
842-
# A view limit where the minimum radius can be locked if the user
843-
# specifies an alternate origin.
842+
# self.viewLim is set by the superclass and contains (θ, r) as its (x, y)
843+
# components.
844+
845+
# This is a view limit (still in (θ, r) space) where the minimum radius can be
846+
# locked if the user specifies an alternate origin.
844847
self._originViewLim=mtransforms.LockableBbox(self.viewLim)
845848

846849
# Handle angular offset and direction.
@@ -849,83 +852,75 @@ def _set_lim_and_transforms(self):
849852
self._theta_offset=mtransforms.Affine2D() \
850853
.translate(self._default_theta_offset,0.0)
851854
self.transShift=self._direction+self._theta_offset
852-
# A view limit shifted to the correct location after accounting for
853-
# orientation and offset.
854-
self._realViewLim=mtransforms.TransformedBbox(self.viewLim,
855-
self.transShift)
856-
857-
# Transforms the x and y axis separately by a scale factor
858-
# It is assumed that this part will have non-linear components
859-
self.transScale=mtransforms.TransformWrapper(
860-
mtransforms.IdentityTransform())
861-
862-
# Scale view limit into a bbox around the selected wedge. This may be
863-
# smaller than the usual unit axes rectangle if not plotting the full
864-
# circle.
865-
self.axesLim=_WedgeBbox((0.5,0.5),
866-
self._realViewLim,self._originViewLim)
867-
868-
# Scale the wedge to fill the axes.
855+
# This is a view limit in (θ, r) shifted to the correct location after
856+
# accounting for θ orientation and offset.
857+
self._realViewLim=mtransforms.TransformedBbox(self.viewLim,self.transShift)
858+
859+
# Transforms the θ and r axis separately by a scale factor. It is assumed that
860+
# this part will have the non-linear components.
861+
self.transScale=mtransforms.TransformWrapper(mtransforms.IdentityTransform())
862+
863+
# Scale view limit into a bbox around the selected wedge. This may be smaller
864+
# than the usual unit axes rectangle if not plotting the full circle.
865+
self.axesLim=_WedgeBbox((0.5,0.5),self._realViewLim,self._originViewLim)
866+
867+
# Scale the wedge to fill the Axes unit space.
869868
self.transWedge=mtransforms.BboxTransformFrom(self.axesLim)
870869

871-
# Scale theaxesto fill thefigure.
870+
# Scale theAxes unit spaceto fill theAxes actual position.
872871
self.transAxes=mtransforms.BboxTransformTo(self.bbox)
873872

874-
# A (possibly non-linear) projection on the (already scaled)
875-
#data. This one isaware of rmin
873+
# A (possibly non-linear) projection on the (already scaled) data. This one is
874+
# aware of rmin.
876875
self.transProjection=self.PolarTransform(
877876
self,
878877
scale_transform=self.transScale
879878
)
880879
# Add dependency on rorigin.
881880
self.transProjection.set_children(self._originViewLim)
882881

883-
# An affine transformation on the data, generally to limit the
884-
# range of the axes
882+
# An affine transformation on the data, generally to limit the range of the axes
885883
self.transProjectionAffine=self.PolarAffine(self.transScale,
886884
self._originViewLim)
887885

888-
# The complete data transformation stack -- from data all the
889-
# way to display coordinates
890-
#
891-
# 1. Remove any radial axis scaling (e.g. log scaling)
892-
# 2. Shift data in the theta direction
893-
# 3. Project the data from polar to cartesian values
894-
# (with the origin in the same place)
895-
# 4. Scale and translate the cartesian values to Axes coordinates
896-
# (here the origin is moved to the lower left of the Axes)
897-
# 5. Move and scale to fill the Axes
898-
# 6. Convert from Axes coordinates to Figure coordinates
886+
# The complete data transformation stack -- from data all the way to display
887+
# coordinates.
899888
self.transData= (
889+
# 1. Remove any radial axis scaling (e.g. log scaling).
900890
self.transScale+
891+
# 2. Shift data in the θ direction.
901892
self.transShift+
893+
# 3. Project the data from polar to cartesian values (with the origin in the
894+
# same place).
902895
self.transProjection+
903896
(
897+
# 4. Scale and translate the cartesian values to Axes coordinates (here
898+
# the origin is moved to the lower left of the Axes).
904899
self.transProjectionAffine+
900+
# 5. Move and scale to fill the Axes.
905901
self.transWedge+
902+
# 6. Convert from Axes coordinates to Figure coordinates.
906903
self.transAxes
907904
)
908905
)
909906

910-
# This is the transform for theta-axis ticks. It is
911-
# equivalent to transData, except it always puts r == 0.0 and r == 1.0
912-
# at the edge of the axis circles.
907+
# This is the transform for θ-axis ticks. It is equivalent to transData, except
908+
# it always puts r == 0.0 and r == 1.0 at the edge of the axis circles.
913909
self._xaxis_transform= (
914910
mtransforms.blended_transform_factory(
915911
mtransforms.IdentityTransform(),
916912
mtransforms.BboxTransformTo(self.viewLim))+
917913
self.transData)
918-
# Thetheta labels are flipped along the radius, so that text 1 is on
919-
#the outside bydefault. This should work the same as before.
914+
# Theθ labels are flipped along the radius, so that text 1 is on the outside by
915+
# default. This should work the same as before.
920916
flipr_transform=mtransforms.Affine2D() \
921917
.translate(0.0,-0.5) \
922918
.scale(1.0,-1.0) \
923919
.translate(0.0,0.5)
924920
self._xaxis_text_transform=flipr_transform+self._xaxis_transform
925921

926-
# This is the transform for r-axis ticks. It scales the theta
927-
# axis so the gridlines from 0.0 to 1.0, now go from thetamin to
928-
# thetamax.
922+
# This is the transform for r-axis ticks. It scales the θ-axis so the gridlines
923+
# from 0.0 to 1.0, now go from thetamin to thetamax.
929924
self._yaxis_transform= (
930925
mtransforms.blended_transform_factory(
931926
mtransforms.BboxTransformTo(self.viewLim),

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