# Creating axes with fixed distance from figure edge

Thanks Eric - unfortunately I need to be able to resize the figure
interactively and have the axes follow.

So an alternative that would be equally useful for me would be to
an option to say that the distance to the edge of the figure should be
preserved when resizing. In other words, I'm not too concerned about
whether I specify the original axes position in relative units or in
inches, but the important thing is that the distance to the edge of
the figure stays constant in absolute terms.

Is this something that would be easy to build as an Axes subclass?

Cheers,
Tom

···

On 9 September 2015 at 23:12, Eric Firing <efiring@...202...> wrote:

On 2015/09/09 11:01 AM, Thomas Robitaille wrote:

Hi everyone,

I am interested in creating axes in an interactive figure where the
distance from the spines of the axes to the figure edge are constant
in absolute terms.

To clarify what I mean, when using add_axes([0.1, 0.1, 0.8, 0.8]), the
spines of the axes are always located a distance from the edge of the
figure that is 10% of the size of the figure. However, in my case,
since the font size is constant, I want to be able to say that the
spines should always be e.g. 0.5" from the edge of the figure, which
would avoid wasting space when making the figure larger.

Is there a way to do this currently?

This is what I use for positioning in inches:

def axes_inches(fig, rect, **kw):
"""
Wrapper for Figure.add_axes in which *rect* is given in inches.
The translation to normalized coordinates is done immediately
based on the present figsize.

*rect* is left, bottom, width, height in inches

"""

fw = fig.get_figwidth()
fh = fig.get_figheight()
l, b, w, h = rect
relrect = [l / fw, b / fh, w / fw, h / fh]
return ax

Note, however, that this works correctly only if you don't change figsize
after calling it, so maybe it is not what you are looking for.

Eric

(I am aware of set_tight_layout which would result in something
similar, but this is not what I am after - I would like to be able to
specify the exact absolute distance from the figure edge)

Thanks!
Tom

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I managed to write an Axes sub-class to do this:

https://gist.github.com/astrofrog/8d579ea83e578a9cdb99

Try running this then resize the figure and the margin between axes
and figure edge will stay constant.

Is this something that would be useful to have in Matplotlib itself? I
could foresee something like:

If this would be useful, I can open a pull request.

Cheers,
Tom

···

On 9 September 2015 at 23:29, Thomas Robitaille <thomas.robitaille@...287...> wrote:

Thanks Eric - unfortunately I need to be able to resize the figure
interactively and have the axes follow.

So an alternative that would be equally useful for me would be to
an option to say that the distance to the edge of the figure should be
preserved when resizing. In other words, I'm not too concerned about
whether I specify the original axes position in relative units or in
inches, but the important thing is that the distance to the edge of
the figure stays constant in absolute terms.

Is this something that would be easy to build as an Axes subclass?

Cheers,
Tom

On 9 September 2015 at 23:12, Eric Firing <efiring@...202...> wrote:

On 2015/09/09 11:01 AM, Thomas Robitaille wrote:

Hi everyone,

I am interested in creating axes in an interactive figure where the
distance from the spines of the axes to the figure edge are constant
in absolute terms.

To clarify what I mean, when using add_axes([0.1, 0.1, 0.8, 0.8]), the
spines of the axes are always located a distance from the edge of the
figure that is 10% of the size of the figure. However, in my case,
since the font size is constant, I want to be able to say that the
spines should always be e.g. 0.5" from the edge of the figure, which
would avoid wasting space when making the figure larger.

Is there a way to do this currently?

This is what I use for positioning in inches:

def axes_inches(fig, rect, **kw):
"""
Wrapper for Figure.add_axes in which *rect* is given in inches.
The translation to normalized coordinates is done immediately
based on the present figsize.

*rect* is left, bottom, width, height in inches

"""

fw = fig.get_figwidth()
fh = fig.get_figheight()
l, b, w, h = rect
relrect = [l / fw, b / fh, w / fw, h / fh]
return ax

Note, however, that this works correctly only if you don't change figsize
after calling it, so maybe it is not what you are looking for.

Eric

(I am aware of set_tight_layout which would result in something
similar, but this is not what I am after - I would like to be able to
specify the exact absolute distance from the figure edge)

Thanks!
Tom

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What might be more generally useful is to make it easier to specify which coordinate system you wish some spec to apply to. To be frank, I can never keep the transform names straight, and it isn’t possible to specify it at all in some places.

···

On Sep 9, 2015 6:04 PM, “Thomas Robitaille” <thomas.robitaille@…287…> wrote:

I managed to write an Axes sub-class to do this:

https://gist.github.com/astrofrog/8d579ea83e578a9cdb99

Try running this then resize the figure and the margin between axes

and figure edge will stay constant.

Is this something that would be useful to have in Matplotlib itself? I

could foresee something like:

If this would be useful, I can open a pull request.

Cheers,

Tom

On 9 September 2015 at 23:29, Thomas Robitaille > > <thomas.robitaille@…1972…> wrote:

Thanks Eric - unfortunately I need to be able to resize the figure

interactively and have the axes follow.

So an alternative that would be equally useful for me would be to

an option to say that the distance to the edge of the figure should be

preserved when resizing. In other words, I’m not too concerned about

whether I specify the original axes position in relative units or in

inches, but the important thing is that the distance to the edge of

the figure stays constant in absolute terms.

Is this something that would be easy to build as an Axes subclass?

Cheers,

Tom

On 9 September 2015 at 23:12, Eric Firing <efiring@…202…> wrote:

On 2015/09/09 11:01 AM, Thomas Robitaille wrote:

Hi everyone,

I am interested in creating axes in an interactive figure where the

distance from the spines of the axes to the figure edge are constant

in absolute terms.

To clarify what I mean, when using add_axes([0.1, 0.1, 0.8, 0.8]), the

spines of the axes are always located a distance from the edge of the

figure that is 10% of the size of the figure. However, in my case,

since the font size is constant, I want to be able to say that the

spines should always be e.g. 0.5" from the edge of the figure, which

would avoid wasting space when making the figure larger.

Is there a way to do this currently?

This is what I use for positioning in inches:

def axes_inches(fig, rect, **kw):

``````"""
``````
``````Wrapper for Figure.add_axes in which *rect* is given in inches.
``````
``````The translation to normalized coordinates is done immediately
``````
``````based on the present figsize.
``````
``````*rect* is left, bottom, width, height in inches
``````
``````*kw* are passed to Figure.add_axes
``````
``````"""
``````
``````fw = fig.get_figwidth()
``````
``````fh = fig.get_figheight()
``````
``````l, b, w, h = rect
``````
``````relrect = [l / fw, b / fh, w / fw, h / fh]
``````
``````ax = fig.add_axes(relrect, **kw)
``````
``````return ax
``````

Note, however, that this works correctly only if you don’t change figsize

after calling it, so maybe it is not what you are looking for.

Eric

(I am aware of set_tight_layout which would result in something

similar, but this is not what I am after - I would like to be able to

specify the exact absolute distance from the figure edge)

Thanks!

Tom

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