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Commit6eeb109

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Merge pull request#6792 from f0k/pgf-transform
ENH: PGF Backend: Support interpolation='none'
2 parentsf95169e +0eb17a4 commit6eeb109

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3 files changed

+82
-39
lines changed

3 files changed

+82
-39
lines changed

‎examples/api/demo_affine_image.py‎

Lines changed: 30 additions & 19 deletions
Original file line numberDiff line numberDiff line change
@@ -1,11 +1,10 @@
11
"""
2-
For the backends thatsupports draw_image with optional affine
2+
For the backends thatsupport draw_image with optional affine
33
transform (e.g., agg, ps backend), the image of the output should
4-
have its boundarymatches thered rectangles.
4+
have its boundarymatch thedashed yellow rectangle.
55
"""
66

77
importnumpyasnp
8-
importmatplotlib.cmascm
98
importmatplotlib.mlabasmlab
109
importmatplotlib.pyplotasplt
1110
importmatplotlib.transformsasmtransforms
@@ -21,25 +20,37 @@ def get_image():
2120
returnZ
2221

2322

24-
if1:
23+
defdo_plot(ax,Z,transform):
24+
im=ax.imshow(Z,interpolation='none',
25+
origin='lower',
26+
extent=[-2,4,-3,2],clip_on=True)
2527

26-
# image rotation
28+
trans_data=transform+ax.transData
29+
im.set_transform(trans_data)
2730

28-
fig,ax1=plt.subplots(1,1)
29-
Z=get_image()
30-
im1=ax1.imshow(Z,interpolation='none',
31-
origin='lower',
32-
extent=[-2,4,-3,2],clip_on=True)
31+
# display intended extent of the image
32+
x1,x2,y1,y2=im.get_extent()
33+
ax.plot([x1,x2,x2,x1,x1], [y1,y1,y2,y2,y1],"y--",
34+
transform=trans_data)
35+
ax.set_xlim(-5,5)
36+
ax.set_ylim(-4,4)
3337

34-
trans_data2=mtransforms.Affine2D().rotate_deg(30)+ax1.transData
35-
im1.set_transform(trans_data2)
3638

37-
# display intended extent of the image
38-
x1,x2,y1,y2=im1.get_extent()
39-
x3,y3=x2,y1
39+
# prepare image and figure
40+
fig, ((ax1,ax2), (ax3,ax4))=plt.subplots(2,2)
41+
Z=get_image()
42+
43+
# image rotation
44+
do_plot(ax1,Z,mtransforms.Affine2D().rotate_deg(30))
45+
46+
# image skew
47+
do_plot(ax2,Z,mtransforms.Affine2D().skew_deg(30,15))
48+
49+
# scale and reflection
50+
do_plot(ax3,Z,mtransforms.Affine2D().scale(-1,.5))
4051

41-
ax1.plot([x1,x2,x2,x1,x1], [y1,y1,y2,y2,y1],"--",
42-
transform=trans_data2)
52+
# everything and a translation
53+
do_plot(ax4,Z,mtransforms.Affine2D().
54+
rotate_deg(30).skew_deg(30,15).scale(-1,.5).translate(.5,-1))
4355

44-
ax1.set_xlim(-3,5)
45-
ax1.set_ylim(-4,4)
56+
plt.show()

‎lib/matplotlib/backend_bases.py‎

Lines changed: 19 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -508,30 +508,34 @@ def get_image_magnification(self):
508508
"""
509509
return1.0
510510

511-
defdraw_image(self,gc,x,y,im,trans=None):
511+
defdraw_image(self,gc,x,y,im,transform=None):
512512
"""
513-
Drawthe image instance into the current axes;
513+
Drawan RGBA image.
514514
515515
*gc*
516-
aGraphicsContext containingclipping information
516+
a:class:`GraphicsContextBase` instance withclipping information.
517517
518518
*x*
519-
is the distance in pixels from the left hand side of the canvas.
519+
the distance in physical units (i.e., dots or pixels) from the left
520+
hand side of the canvas.
520521
521522
*y*
522-
the distance from the origin. That is, if origin is
523-
upper, y is the distance from top. If origin is lower, y
524-
is the distance from bottom
523+
the distance in physical units (i.e., dots or pixels) from the
524+
bottom side of the canvas.
525525
526526
*im*
527527
An NxMx4 array of RGBA pixels (of dtype uint8).
528528
529-
*trans*
530-
If the concrete backend is written such that
531-
`option_scale_image` returns `True`, an affine
532-
transformation may also be passed to `draw_image`. The
533-
backend should apply the transformation to the image
534-
before applying the translation of `x` and `y`.
529+
*transform*
530+
If and only if the concrete backend is written such that
531+
:meth:`option_scale_image` returns ``True``, an affine
532+
transformation *may* be passed to :meth:`draw_image`. It takes the
533+
form of a :class:`~matplotlib.transforms.Affine2DBase` instance.
534+
The translation vector of the transformation is given in physical
535+
units (i.e., dots or pixels). Note that the transformation does not
536+
override `x` and `y`, and has to be applied *before* translating
537+
the result by `x` and `y` (this can be accomplished by adding `x`
538+
and `y` to the translation vector defined by `transform`).
535539
"""
536540
raiseNotImplementedError
537541

@@ -544,8 +548,8 @@ def option_image_nocomposite(self):
544548

545549
defoption_scale_image(self):
546550
"""
547-
override this method for renderers that support arbitrary
548-
scaling of image (mostof thevectorbackend).
551+
override this method for renderers that support arbitrary affine
552+
transformations in :meth:`draw_image` (most vectorbackends).
549553
"""
550554
returnFalse
551555

‎lib/matplotlib/backends/backend_pgf.py‎

Lines changed: 33 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -609,9 +609,23 @@ def _pgf_path_draw(self, stroke=True, fill=False):
609609
actions.append("fill")
610610
writeln(self.fh,r"\pgfusepath{%s}"%",".join(actions))
611611

612-
defdraw_image(self,gc,x,y,im):
613-
# TODO: Almost no documentation for the behavior of this function.
614-
# Something missing?
612+
defoption_scale_image(self):
613+
"""
614+
pgf backend supports affine transform of image.
615+
"""
616+
returnTrue
617+
618+
defoption_image_nocomposite(self):
619+
"""
620+
return whether to generate a composite image from multiple images on
621+
a set of axes
622+
"""
623+
returnnotrcParams['image.composite_image']
624+
625+
defdraw_image(self,gc,x,y,im,transform=None):
626+
h,w=im.shape[:2]
627+
ifw==0orh==0:
628+
return
615629

616630
# save the images to png files
617631
path=os.path.dirname(self.fh.name)
@@ -623,9 +637,23 @@ def draw_image(self, gc, x, y, im):
623637
# reference the image in the pgf picture
624638
writeln(self.fh,r"\begin{pgfscope}")
625639
self._print_pgf_clip(gc)
626-
h,w=im.shape[:2]
627640
f=1./self.dpi# from display coords to inch
628-
writeln(self.fh,r"\pgftext[at=\pgfqpoint{%fin}{%fin},left,bottom]{\pgfimage[interpolate=true,width=%fin,height=%fin]{%s}}"% (x*f,y*f,w*f,h*f,fname_img))
641+
iftransformisNone:
642+
writeln(self.fh,
643+
r"\pgfsys@transformshift{%fin}{%fin}"% (x*f,y*f))
644+
w,h=w*f,h*f
645+
else:
646+
tr1,tr2,tr3,tr4,tr5,tr6=transform.frozen().to_values()
647+
writeln(self.fh,
648+
r"\pgfsys@transformcm{%f}{%f}{%f}{%f}{%fin}{%fin}"%
649+
(tr1*f,tr2*f,tr3*f,tr4*f,
650+
(tr5+x)*f, (tr6+y)*f))
651+
w=h=1# scale is already included in the transform
652+
interp=str(transformisNone).lower()# interpolation in PDF reader
653+
writeln(self.fh,
654+
r"\pgftext[left,bottom]"
655+
r"{\pgfimage[interpolate=%s,width=%fin,height=%fin]{%s}}"%
656+
(interp,w,h,fname_img))
629657
writeln(self.fh,r"\end{pgfscope}")
630658

631659
defdraw_tex(self,gc,x,y,s,prop,angle,ismath="TeX!",mtext=None):

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