You may use offsetbox module.
Here is an complete example. Note that the circle always has a size of
25 point and also is draggable,
Regards,
-JJ
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.patches import CirclePolygon, Circle
x = np.arange(0, 10, 0.1)
y = np.exp(-x/2.) * np.sin(2*np.pi*x)
fig = plt.figure()
ax = fig.add_subplot(111)
ax.plot(x, y, 'ro-', zorder=0)
ax.set_xlim(0, 10)
ax.set_ylim(-1, 1)
# I want this circle to appear as a circle
from matplotlib.offsetbox import DrawingArea, AnnotationBbox,
DraggableAnnotation
circle_radius = 25 # in points
da = DrawingArea(width=2*circle_radius, height=2*circle_radius,
xdescent=circle_radius, ydescent=circle_radius, clip=False)
circle = Circle((0.,0.), radius=circle_radius, zorder=1, alpha=0.5)
da.add_artist(circle)
an1 = AnnotationBbox(da,
xy=(7.5, 0.0), xycoords='data',
frameon=False, pad=0.,
annotation_clip=False,
box_alignment=(0.5, 0.5),
)
ax.add_artist(an1)
class DraggableAnn(DraggableAnnotation):
def finalize_offset(self):
loc_in_canvas = self.annotation.xytext
self.annotation.textcoords = "data"
pos_data =
self.annotation.axes.transData.inverted().transform_point(loc_in_canvas)
self.annotation.xytext = tuple(pos_data)
drag1 = DraggableAnn(an1, use_blit=False)
plt.show()
On Wed, Mar 9, 2011 at 11:15 PM, Mads Ipsen <[email protected]> wrote:
> I want the blue circle to appear as a circle with a 1:1 aspect ratio, making
> it look like a circle and not an ellipse. Just like the scale free circles
> making up the curve of the damped oscillationsn also shown in the plot.
>
> Preferably, the circle should also be scale free making it have the same
> size no-matter how much the plot has been zoomed.
>
>
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