Re: [Matplotlib-users] Not scaling patches.
On Thu, Aug 26, 2010 at 2:24 PM, Ben Edwards bedwa...@cs.unm.edu wrote:
Hello, I've used matplotlib for a while but never had cause to ask a
question until now. I am trying to add a patch to an axis, but would like
the patch to remain the same size when, interactively, I resize the
resulting figure. I am using TkAgg, and trying the following:
import matplotlib.pyplot as plt
import matplotlib.patches as patches
ax = plt.gca()
cp = patches.Circle((.5,.5),.025)
ax.add_patch(cp)
ax.set_aspect('equal')
plt.draw()
plt.show()
This gives me a nice blue circle in the middle of the plot, and using
ax.set_aspect('equal') I know that it will not be distorted into an ellipse.
But is there a way to ensure that when I make the Tk window bigger, that the
circle appears to be the same size as it was previously? I assume this would
entail some sort of transform, but I don't quite understand how they work...
Ben
I haven't tried using this tool myself, and it might not be what you want,
but there is an AnchoredArtist tool that might interest you:
http://matplotlib.sourceforge.net/mpl_toolkits/axes_grid/users/overview.html#anchoredartists
I think this means that it wouldn't move at all, and I don't know if that is
what you want. I hope this helps!
Ben Root
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Re: [Matplotlib-users] Not scaling patches.
On Thu, Aug 26, 2010 at 2:24 PM, Ben Edwards bedwa...@cs.unm.edu wrote:
Hello, I've used matplotlib for a while but never had cause to ask a
question until now. I am trying to add a patch to an axis, but would like
the patch to remain the same size when, interactively, I resize the
resulting figure. I am using TkAgg, and trying the following:
import matplotlib.pyplot as plt
import matplotlib.patches as patches
ax = plt.gca()
cp = patches.Circle((.5,.5),.025)
ax.add_patch(cp)
ax.set_aspect('equal')
plt.draw()
plt.show()
This gives me a nice blue circle in the middle of the plot, and using
ax.set_aspect('equal') I know that it will not be distorted into an ellipse.
But is there a way to ensure that when I make the Tk window bigger, that the
circle appears to be the same size as it was previously? I assume this would
entail some sort of transform, but I don't quite understand how they work...
You can make the circle this way, specifying everything in axes coordinates:
cp = patches.Circle((.5,.5),.025, transform=ax.transAxes)
However, this puts the circle in the same spot in axes coordinates
[(0.5,0.5) is the middle of the plot]. I'm not sure if that's what you
want. I can't see any way to get Circle to use different transforms
for the center and the size, so from here the only path forward I see
is subclassing Circle. This way you could add code to the draw method
to calculate the center in axes coordinates from the center in data
coords. This needs to be done at draw time since the mapping of data
coords-axes coords changes as you pan and zoom.
Ryan
--
Ryan May
Graduate Research Assistant
School of Meteorology
University of Oklahoma
--
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Re: [Matplotlib-users] Not scaling patches.
On 08/27/2010 07:15 AM, Ryan May wrote:
On Thu, Aug 26, 2010 at 2:24 PM, Ben Edwardsbedwa...@cs.unm.edu wrote:
Hello, I've used matplotlib for a while but never had cause to ask a
question until now. I am trying to add a patch to an axis, but would like
the patch to remain the same size when, interactively, I resize the
resulting figure. I am using TkAgg, and trying the following:
import matplotlib.pyplot as plt
import matplotlib.patches as patches
ax = plt.gca()
cp = patches.Circle((.5,.5),.025)
ax.add_patch(cp)
ax.set_aspect('equal')
plt.draw()
plt.show()
This gives me a nice blue circle in the middle of the plot, and using
ax.set_aspect('equal') I know that it will not be distorted into an ellipse.
But is there a way to ensure that when I make the Tk window bigger, that the
circle appears to be the same size as it was previously? I assume this would
entail some sort of transform, but I don't quite understand how they work...
You can make the circle this way, specifying everything in axes coordinates:
cp = patches.Circle((.5,.5),.025, transform=ax.transAxes)
However, this puts the circle in the same spot in axes coordinates
[(0.5,0.5) is the middle of the plot]. I'm not sure if that's what you
want. I can't see any way to get Circle to use different transforms
for the center and the size, so from here the only path forward I see
is subclassing Circle. This way you could add code to the draw method
to calculate the center in axes coordinates from the center in data
coords. This needs to be done at draw time since the mapping of data
coords-axes coords changes as you pan and zoom.
A simpler alternative is to use a CircleCollection with a single member.
Collections allow separate transforms for the patch and the offset;
the latter determines the location of the center.
Eric
Ryan
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Re: [Matplotlib-users] Not scaling patches.
On Fri, Aug 27, 2010 at 1:16 PM, Eric Firing efir...@hawaii.edu wrote: On 08/27/2010 07:15 AM, Ryan May wrote: You can make the circle this way, specifying everything in axes coordinates: cp = patches.Circle((.5,.5),.025, transform=ax.transAxes) However, this puts the circle in the same spot in axes coordinates [(0.5,0.5) is the middle of the plot]. I'm not sure if that's what you want. I can't see any way to get Circle to use different transforms for the center and the size, so from here the only path forward I see is subclassing Circle. This way you could add code to the draw method to calculate the center in axes coordinates from the center in data coords. This needs to be done at draw time since the mapping of data coords-axes coords changes as you pan and zoom. A simpler alternative is to use a CircleCollection with a single member. Collections allow separate transforms for the patch and the offset; the latter determines the location of the center. Why in the world didn't that occur to me? Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma -- Sell apps to millions through the Intel(R) Atom(Tm) Developer Program Be part of this innovative community and reach millions of netbook users worldwide. Take advantage of special opportunities to increase revenue and speed time-to-market. Join now, and jumpstart your future. http://p.sf.net/sfu/intel-atom-d2d ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
[Matplotlib-users] Not scaling patches.
Hello, I've used matplotlib for a while but never had cause to ask a
question until now. I am trying to add a patch to an axis, but would like
the patch to remain the same size when, interactively, I resize the
resulting figure. I am using TkAgg, and trying the following:
import matplotlib.pyplot as plt
import matplotlib.patches as patches
ax = plt.gca()
cp = patches.Circle((.5,.5),.025)
ax.add_patch(cp)
ax.set_aspect('equal')
plt.draw()
plt.show()
This gives me a nice blue circle in the middle of the plot, and using
ax.set_aspect('equal') I know that it will not be distorted into an ellipse.
But is there a way to ensure that when I make the Tk window bigger, that the
circle appears to be the same size as it was previously? I assume this would
entail some sort of transform, but I don't quite understand how they work...
Ben
--
Sell apps to millions through the Intel(R) Atom(Tm) Developer Program
Be part of this innovative community and reach millions of netbook users
worldwide. Take advantage of special opportunities to increase revenue and
speed time-to-market. Join now, and jumpstart your future.
http://p.sf.net/sfu/intel-atom-d2d___
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