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Commit06e389f

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Merge pull request#4699 from QuLogic/polar-limits
Polar limits enhancements
2 parents2ed56ab +7b998e1 commit06e389f

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Lines changed: 37 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,37 @@
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Enhancements to polar plot
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--------------------------
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The polar axes transforms have been greatly re-factored to allow for more
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customization of view limits and tick labelling. Additional options for view
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limits allow for creating an annulus, a sector, or some combination of the two.
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The:meth:`~matplotlib.axes.projections.polar.PolarAxes.set_rorigin` method may
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be used to provide an offset to the minimum plotting radius, producing an
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annulus.
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The:meth:`~matplotlib.projections.polar.PolarAxes.set_theta_zero_location` now
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has an optional:code:`offset` argument. This argument may be used to further
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specify the zero location based on the given anchor point.
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..figure::../../gallery/pie_and_polar_charts/images/sphx_glr_polar_scatter_001.png
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:target:../../gallery/pie_and_polar_charts/polar_scatter.html
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:align:center
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:scale:50
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Polar Offset Demo
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The:meth:`~matplotlib.axes.projections.polar.PolarAxes.set_thetamin` and
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:meth:`~matplotlib.axes.projections.polar.PolarAxes.set_thetamax` methods may
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be used to limit the range of angles plotted, producing sectors of a circle.
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..figure::../../gallery/pie_and_polar_charts/images/sphx_glr_polar_scatter_002.png
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:target:../../gallery/pie_and_polar_charts/polar_scatter.html
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:align:center
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:scale:50
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Polar Sector Demo
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Previous releases allowed plots containing negative radii for which the
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negative values are simply used as labels, and the real radius is shifted by
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the configured minimum. This release also allows negative radii to be used for
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grids and ticks, which were previously silently ignored.

‎examples/api/radar_chart.py

Lines changed: 8 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -37,11 +37,10 @@ def radar_factory(num_vars, frame='circle'):
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"""
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# calculate evenly-spaced axis angles
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theta=np.linspace(0,2*np.pi,num_vars,endpoint=False)
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# rotate theta such that the first axis is at the top
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theta+=np.pi/2
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defdraw_poly_patch(self):
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verts=unit_poly_verts(theta)
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# rotate theta such that the first axis is at the top
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verts=unit_poly_verts(theta+np.pi/2)
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returnplt.Polygon(verts,closed=True,edgecolor='k')
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defdraw_circle_patch(self):
@@ -60,6 +59,11 @@ class RadarAxes(PolarAxes):
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# define draw_frame method
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draw_patch=patch_dict[frame]
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def__init__(self,*args,**kwargs):
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super(RadarAxes,self).__init__(*args,**kwargs)
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# rotate plot such that the first axis is at the top
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self.set_theta_zero_location('N')
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deffill(self,*args,**kwargs):
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"""Override fill so that line is closed by default"""
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closed=kwargs.pop('closed',True)
@@ -93,7 +97,7 @@ def _gen_axes_spines(self):
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# spine_type must be 'left', 'right', 'top', 'bottom', or `circle`.
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spine_type='circle'
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verts=unit_poly_verts(theta)
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verts=unit_poly_verts(theta+np.pi/2)
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# close off polygon by repeating first vertex
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verts.append(verts[0])
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path=Path(verts)

‎examples/pie_and_polar_charts/polar_scatter.py

Lines changed: 31 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -3,8 +3,6 @@
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Scatter plot on polar axis
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==========================
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6-
Demo of scatter plot on a polar axis.
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Size increases radially in this example and color increases with angle
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(just to verify the symbols are being scattered correctly).
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"""
@@ -22,7 +20,37 @@
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area=200*r**2
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colors=theta
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ax=plt.subplot(111,projection='polar')
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fig=plt.figure()
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ax=fig.add_subplot(111,projection='polar')
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c=ax.scatter(theta,r,c=colors,s=area,cmap='hsv',alpha=0.75)
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###############################################################################
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# Scatter plot on polar axis, with offset origin
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# ----------------------------------------------
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#
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# The main difference with the previous plot is the configuration of the origin
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# radius, producing an annulus. Additionally, the theta zero location is set to
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# rotate the plot.
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fig=plt.figure()
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ax=fig.add_subplot(111,polar=True)
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c=ax.scatter(theta,r,c=colors,s=area,cmap='hsv',alpha=0.75)
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ax.set_rorigin(-2.5)
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ax.set_theta_zero_location('W',offset=10)
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###############################################################################
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# Scatter plot on polar axis confined to a sector
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# -----------------------------------------------
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#
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# The main difference with the previous plots is the configuration of the
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# theta start and end limits, producing a sector instead of a full circle.
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fig=plt.figure()
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ax=fig.add_subplot(111,polar=True)
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c=ax.scatter(theta,r,c=colors,s=area,cmap='hsv',alpha=0.75)
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ax.set_thetamin(45)
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ax.set_thetamax(135)
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plt.show()

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