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Commit4e8d111

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Add URL support for images in PDF backend
1 parent51ce677 commit4e8d111

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3 files changed

+174
-28
lines changed

3 files changed

+174
-28
lines changed
Lines changed: 10 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,10 @@
1+
URL Support for Images in PDF Backend
2+
-------------------------------------
3+
4+
The PDF backend can now generate clickable images if a URL is provided to the
5+
image. There are a few limitations worth noting though:
6+
7+
* If parts of the image are clipped, the non-visible parts are still clickable.
8+
* If there are transforms applied to the image, the whole enclosing rectangle
9+
is clickable. However, if you use ``interpolation='none'`` for the image,
10+
only the transformed image area is clickable (depending on viewer support).

‎lib/matplotlib/backends/backend_pdf.py

Lines changed: 69 additions & 28 deletions
Original file line numberDiff line numberDiff line change
@@ -230,32 +230,66 @@ def _datetime_to_pdf(d):
230230
returnr
231231

232232

233-
def_calculate_quad_point_coordinates(x,y,width,height,angle=0):
233+
def_calculate_rotated_quad_point_coordinates(x,y,width,height,angle):
234234
"""
235235
Calculate the coordinates of rectangle when rotated by angle around x, y
236236
"""
237237

238-
angle=math.radians(-angle)
238+
angle=math.radians(angle)
239239
sin_angle=math.sin(angle)
240240
cos_angle=math.cos(angle)
241-
a=x+height*sin_angle
241+
width_cos=width*cos_angle
242+
width_sin=width*sin_angle
243+
a=x-height*sin_angle
242244
b=y+height*cos_angle
243-
c=x+width*cos_angle+height*sin_angle
244-
d=y-width*sin_angle+height*cos_angle
245-
e=x+width*cos_angle
246-
f=y-width*sin_angle
245+
c=a+width_cos
246+
d=b+width_sin
247+
e=x+width_cos
248+
f=y+width_sin
247249
return ((x,y), (e,f), (c,d), (a,b))
248250

249251

250-
def_get_coordinates_of_block(x,y,width,height,angle=0):
252+
def_calculate_transformed_quad_point_coordinates(x,y,trans):
251253
"""
252-
Get the coordinates of rotated rectangle and rectangle that covers the
253-
rotated rectangle.
254+
Calculate the coordinates of rectangle when transformed by trans
255+
positioned at x, y
256+
"""
257+
tr1,tr2,tr3,tr4,tr5,tr6=trans
258+
# Conceptual code
259+
# width = 1
260+
# height = 1
261+
# a = x + 0 * tr1 + height * tr3 + tr5
262+
# b = y + 0 * tr2 + height * tr4 + tr6
263+
# c = x + width * tr1 + height * tr3 + tr5
264+
# d = y + width * tr2 + height * tr4 + tr6
265+
# e = x + width * tr1 + 0 * tr3 + tr5
266+
# f = y + width * tr2 + 0 * tr4 + tr6
267+
# x = x + 0 * tr1 + 0 * tr3 + tr5
268+
# y = y + 0 * tr2 + 0 * tr4 + tr6
269+
x=x+tr5
270+
y=y+tr6
271+
a=x+tr3
272+
b=y+tr4
273+
c=a+tr1
274+
d=b+tr2
275+
e=x+tr1
276+
f=y+tr2
277+
return (((x,y), (e,f), (c,d), (a,b)),
278+
(0ifmath.isclose(tr2,0)else45))
279+
280+
281+
def_get_coordinates_of_block(x,y,width,height,angle,trans):
282+
"""
283+
Get the coordinates of rotated or transformed rectangle and rectangle
284+
that covers the rotated or transformed rectangle.
254285
"""
255286

256-
vertices=_calculate_quad_point_coordinates(x,y,width,
257-
height,angle)
258-
287+
iftransisNone:
288+
vertices=_calculate_rotated_quad_point_coordinates(x,y,width,
289+
height,angle)
290+
else:
291+
vertices,angle=_calculate_transformed_quad_point_coordinates(x,y,
292+
trans)
259293
# Find min and max values for rectangle
260294
# adjust so that QuadPoints is inside Rect
261295
# PDF docs says that QuadPoints should be ignored if any point lies
@@ -268,27 +302,29 @@ def _get_coordinates_of_block(x, y, width, height, angle=0):
268302
max_x=max(v[0]forvinvertices)+pad
269303
max_y=max(v[1]forvinvertices)+pad
270304
return (tuple(itertools.chain.from_iterable(vertices)),
271-
(min_x,min_y,max_x,max_y))
305+
(min_x,min_y,max_x,max_y),angle)
272306

273307

274-
def_get_link_annotation(gc,x,y,width,height,angle=0):
308+
def_get_link_annotation(gc,x,y,width,height,angle=0,trans=None):
275309
"""
276310
Create a link annotation object for embedding URLs.
277311
"""
278-
quadpoints,rect=_get_coordinates_of_block(x,y,width,height,angle)
279312
link_annotation= {
280313
'Type':Name('Annot'),
281314
'Subtype':Name('Link'),
282-
'Rect':rect,
283315
'Border': [0,0,0],
284316
'A': {
285317
'S':Name('URI'),
286318
'URI':gc.get_url(),
287319
},
288320
}
321+
quadpoints,rect,angle=_get_coordinates_of_block(x,y,width,height,
322+
angle,trans)
323+
link_annotation['Rect']=rect
289324
ifangle%90:
290325
# Add QuadPoints
291326
link_annotation['QuadPoints']=quadpoints
327+
292328
returnlink_annotation
293329

294330

@@ -2012,21 +2048,24 @@ def draw_image(self, gc, x, y, im, transform=None):
20122048

20132049
self.check_gc(gc)
20142050

2015-
w=72.0*w/self.image_dpi
2016-
h=72.0*h/self.image_dpi
2017-
20182051
imob=self.file.imageObject(im)
20192052

20202053
iftransformisNone:
2054+
w=72.0*w/self.image_dpi
2055+
h=72.0*h/self.image_dpi
2056+
ifgc.get_url()isnotNone:
2057+
self._add_link_annotation(gc,x,y,w,h)
20212058
self.file.output(Op.gsave,
20222059
w,0,0,h,x,y,Op.concat_matrix,
20232060
imob,Op.use_xobject,Op.grestore)
20242061
else:
2025-
tr1,tr2,tr3,tr4,tr5,tr6=transform.frozen().to_values()
2062+
trans=transform.frozen().to_values()
2063+
ifgc.get_url()isnotNone:
2064+
self._add_link_annotation(gc,x,y,w,h,trans=trans)
20262065

20272066
self.file.output(Op.gsave,
20282067
1,0,0,1,x,y,Op.concat_matrix,
2029-
tr1,tr2,tr3,tr4,tr5,tr6,Op.concat_matrix,
2068+
*trans,Op.concat_matrix,
20302069
imob,Op.use_xobject,Op.grestore)
20312070

20322071
defdraw_path(self,gc,path,transform,rgbFace=None):
@@ -2038,6 +2077,11 @@ def draw_path(self, gc, path, transform, rgbFace=None):
20382077
gc.get_sketch_params())
20392078
self.file.output(self.gc.paint())
20402079

2080+
def_add_link_annotation(self,gc,x,y,width,height,angle=0,
2081+
trans=None):
2082+
self.file._annotations[-1][1].append(
2083+
_get_link_annotation(gc,x,y,width,height,angle,trans))
2084+
20412085
defdraw_path_collection(self,gc,master_transform,paths,all_transforms,
20422086
offsets,offsetTrans,facecolors,edgecolors,
20432087
linewidths,linestyles,antialiaseds,urls,
@@ -2206,8 +2250,7 @@ def draw_mathtext(self, gc, x, y, s, prop, angle):
22062250
self._text2path.mathtext_parser.parse(s,72,prop)
22072251

22082252
ifgc.get_url()isnotNone:
2209-
self.file._annotations[-1][1].append(_get_link_annotation(
2210-
gc,x,y,width,height,angle))
2253+
self._add_link_annotation(gc,x,y,width,height,angle)
22112254

22122255
fonttype=mpl.rcParams['pdf.fonttype']
22132256

@@ -2263,8 +2306,7 @@ def draw_tex(self, gc, x, y, s, prop, angle, *, mtext=None):
22632306
page,=dvi
22642307

22652308
ifgc.get_url()isnotNone:
2266-
self.file._annotations[-1][1].append(_get_link_annotation(
2267-
gc,x,y,page.width,page.height,angle))
2309+
self._add_link_annotation(gc,x,y,page.width,page.height,angle)
22682310

22692311
# Gather font information and do some setup for combining
22702312
# characters into strings. The variable seq will contain a
@@ -2364,8 +2406,7 @@ def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
23642406
ifgc.get_url()isnotNone:
23652407
font.set_text(s)
23662408
width,height=font.get_width_height()
2367-
self.file._annotations[-1][1].append(_get_link_annotation(
2368-
gc,x,y,width/64,height/64,angle))
2409+
self._add_link_annotation(gc,x,y,width/64,height/64,angle)
23692410

23702411
# If fonttype is neither 3 nor 42, emit the whole string at once
23712412
# without manual kerning.

‎lib/matplotlib/tests/test_backend_pdf.py

Lines changed: 95 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -360,6 +360,101 @@ def test_kerning():
360360
fig.text(0,.75,s,size=20)
361361

362362

363+
deftest_image_url():
364+
pikepdf=pytest.importorskip('pikepdf')
365+
366+
image_url='https://test_image_urls.matplotlib.org/'
367+
image_url2='https://test_image_urls2.matplotlib.org/'
368+
369+
X,Y=np.meshgrid(np.arange(-5,5,1),np.arange(-5,5,1))
370+
Z=np.sin(Y**2)
371+
fig,ax=plt.subplots()
372+
ax.imshow(Z,extent=[0,1,0,1],url=image_url)
373+
withio.BytesIO()asfd:
374+
fig.savefig(fd,format="pdf")
375+
withpikepdf.Pdf.open(fd)aspdf:
376+
annots=pdf.pages[0].Annots
377+
378+
# Iteration over Annots must occur within the context manager,
379+
# otherwise it may fail depending on the pdf structure.
380+
annot=next(
381+
(aforainannotsifa.A.URI==image_url),
382+
None)
383+
assertannotisnotNone
384+
# Positions in points (72 per inch.)
385+
assertannot.Rect== [decimal.Decimal('122.4'),
386+
decimal.Decimal('43.2'),
387+
468,
388+
decimal.Decimal('388.8')]
389+
ax.set_xlim(0,3)
390+
ax.imshow(Z[::-1],extent=[2,3,0,1],url=image_url2)
391+
# Must save as separate images
392+
plt.rcParams['image.composite_image']=False
393+
withio.BytesIO()asfd:
394+
fig.savefig(fd,format="pdf")
395+
withpikepdf.Pdf.open(fd)aspdf:
396+
annots=pdf.pages[0].Annots
397+
398+
# Iteration over Annots must occur within the context manager,
399+
# otherwise it may fail depending on the pdf structure.
400+
annot=next(
401+
(aforainannotsifa.A.URI==image_url2),
402+
None)
403+
assertannotisnotNone
404+
# Positions in points (72 per inch.)
405+
assertannot.Rect== [decimal.Decimal('369.6'),
406+
decimal.Decimal('141.6'),
407+
decimal.Decimal('518.64'),
408+
decimal.Decimal('290.64')]
409+
410+
411+
deftest_transformed_image_url():
412+
pikepdf=pytest.importorskip('pikepdf')
413+
414+
image_url='https://test_image_urls.matplotlib.org/'
415+
416+
X,Y=np.meshgrid(np.arange(-5,5,1),np.arange(-5,5,1))
417+
Z=np.sin(Y**2)
418+
fig,ax=plt.subplots()
419+
im=ax.imshow(Z,interpolation='none',url=image_url)
420+
withio.BytesIO()asfd:
421+
fig.savefig(fd,format="pdf")
422+
withpikepdf.Pdf.open(fd)aspdf:
423+
annots=pdf.pages[0].Annots
424+
425+
# Iteration over Annots must occur within the context manager,
426+
# otherwise it may fail depending on the pdf structure.
427+
annot=next(
428+
(aforainannotsifa.A.URI==image_url),
429+
None)
430+
assertannotisnotNone
431+
# Positions in points (72 per inch.)
432+
assertannot.Rect== [decimal.Decimal('122.4'),
433+
decimal.Decimal('43.2'),
434+
decimal.Decimal('468.4'),
435+
decimal.Decimal('389.2')]
436+
assertgetattr(annot,'QuadPoints',None)isNone
437+
# Transform
438+
im.set_transform(mpl.transforms.Affine2D().skew_deg(30,15)+ax.transData)
439+
withio.BytesIO()asfd:
440+
fig.savefig(fd,format="pdf")
441+
withpikepdf.Pdf.open(fd)aspdf:
442+
annots=pdf.pages[0].Annots
443+
444+
# Iteration over Annots must occur within the context manager,
445+
# otherwise it may fail depending on the pdf structure.
446+
annot=next(
447+
(aforainannotsifa.A.URI==image_url),
448+
None)
449+
assertannotisnotNone
450+
# Positions in points (72 per inch.)
451+
assertannot.Rect[0]==decimal.Decimal('112.411830343')
452+
assertgetattr(annot,'QuadPoints',None)isnotNone
453+
# Positions in points (72 per inch)
454+
assertannot.Rect[0]== \
455+
annot.QuadPoints[0]-decimal.Decimal('0.00001')
456+
457+
363458
deftest_glyphs_subset():
364459
fpath=str(_get_data_path("fonts/ttf/DejaVuSerif.ttf"))
365460
chars="these should be subsetted! 1234567890"

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