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SF.net SVN: matplotlib:[7441] trunk/matplotlib/examples/pylab_examples/ demo_text_path.py
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From: <lee...@us...> - 2009-08-09 20:58:31
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Revision: 7441
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=7441&view=rev
Author: leejjoon
Date: 2009-08-09 20:58:24 +0000 (Sun, 09 Aug 2009)
Log Message:
-----------
added demo_text_path.py
Added Paths:
-----------
trunk/matplotlib/examples/pylab_examples/demo_text_path.py
Added: trunk/matplotlib/examples/pylab_examples/demo_text_path.py
===================================================================
--- trunk/matplotlib/examples/pylab_examples/demo_text_path.py (rev 0)
+++ trunk/matplotlib/examples/pylab_examples/demo_text_path.py 2009-08-09 20:58:24 UTC (rev 7441)
@@ -0,0 +1,213 @@
+
+# -*- coding: utf-8 -*-
+
+import matplotlib.pyplot as plt
+from matplotlib.image import BboxImage
+import numpy as np
+from matplotlib.transforms import Affine2D, IdentityTransform
+
+import matplotlib.font_manager as font_manager
+from matplotlib.ft2font import FT2Font, KERNING_DEFAULT, LOAD_NO_HINTING
+from matplotlib.font_manager import FontProperties
+from matplotlib.path import Path
+import matplotlib.patches as mpatches
+
+from matplotlib.offsetbox import AnnotationBbox,\
+ AnchoredOffsetbox, AuxTransformBox
+
+#from matplotlib.offsetbox import
+
+from matplotlib.cbook import get_sample_data
+
+
+class TextPatch(mpatches.PathPatch):
+
+ FONT_SCALE = 100.
+
+ def __init__(self, xy, s, size=None, prop=None, bbox_image=None,
+ *kl, **kwargs):
+ if prop is None:
+ prop = FontProperties()
+
+ if size is None:
+ size = prop.get_size_in_points()
+
+ self._xy = xy
+ self.set_size(size)
+
+ self.text_path = self.text_get_path(prop, s)
+
+ mpatches.PathPatch.__init__(self, self.text_path, *kl, **kwargs)
+
+ self._init_bbox_image(bbox_image)
+
+
+ def _init_bbox_image(self, im):
+
+ if im is None:
+ self.bbox_image = None
+ else:
+ bbox_image = BboxImage(self.get_window_extent,
+ norm = None,
+ origin=None,
+ )
+ bbox_image.set_transform(IdentityTransform())
+
+ bbox_image.set_data(im)
+ self.bbox_image = bbox_image
+
+ def draw(self, renderer=None):
+
+
+ if self.bbox_image is not None:
+ # the clip path must be updated every draw. any solution? -JJ
+ self.bbox_image.set_clip_path(self.text_path, self.get_transform())
+ self.bbox_image.draw(renderer)
+
+ mpatches.PathPatch.draw(self, renderer)
+
+
+ def set_size(self, size):
+ self._size = size
+
+ def get_size(self):
+ return self._size
+
+ def get_patch_transform(self):
+ tr = Affine2D().scale(self._size/self.FONT_SCALE, self._size/self.FONT_SCALE)
+ return tr.translate(*self._xy)
+
+ def glyph_char_path(self, glyph, currx=0.):
+
+ verts, codes = [], []
+ for step in glyph.path:
+ if step[0] == 0: # MOVE_TO
+ verts.append((step[1], step[2]))
+ codes.append(Path.MOVETO)
+ elif step[0] == 1: # LINE_TO
+ verts.append((step[1], step[2]))
+ codes.append(Path.LINETO)
+ elif step[0] == 2: # CURVE3
+ verts.extend([(step[1], step[2]),
+ (step[3], step[4])])
+ codes.extend([Path.CURVE3, Path.CURVE3])
+ elif step[0] == 3: # CURVE4
+ verts.extend([(step[1], step[2]),
+ (step[3], step[4]),
+ (step[5], step[6])])
+ codes.extend([Path.CURVE4, Path.CURVE4, Path.CURVE4])
+ elif step[0] == 4: # ENDPOLY
+ verts.append((0, 0,))
+ codes.append(Path.CLOSEPOLY)
+
+ verts = [(x+currx, y) for (x,y) in verts]
+
+ return verts, codes
+
+
+ def text_get_path(self, prop, s):
+
+ fname = font_manager.findfont(prop)
+ font = FT2Font(str(fname))
+
+ font.set_size(self.FONT_SCALE, 72)
+
+ cmap = font.get_charmap()
+ lastgind = None
+
+ currx = 0
+
+ verts, codes = [], []
+
+ for c in s:
+
+ ccode = ord(c)
+ gind = cmap.get(ccode)
+ if gind is None:
+ ccode = ord('?')
+ gind = 0
+ glyph = font.load_char(ccode, flags=LOAD_NO_HINTING)
+
+
+ if lastgind is not None:
+ kern = font.get_kerning(lastgind, gind, KERNING_DEFAULT)
+ else:
+ kern = 0
+ currx += (kern / 64.0) #/ (self.FONT_SCALE)
+
+ verts1, codes1 = self.glyph_char_path(glyph, currx)
+ verts.extend(verts1)
+ codes.extend(codes1)
+
+
+ currx += (glyph.linearHoriAdvance / 65536.0) #/ (self.FONT_SCALE)
+ lastgind = gind
+
+ return Path(verts, codes)
+
+if 1:
+
+ fig = plt.figure(1)
+
+ # EXAMPLE 1
+
+ ax = plt.subplot(211)
+
+ from matplotlib._png import read_png
+ fn = get_sample_data("lena.png", asfileobj=False)
+ arr = read_png(fn)
+ p = TextPatch((0, 0), "!?", size=150, fc="none", ec="k",
+ bbox_image=arr,
+ transform=IdentityTransform())
+ p.set_clip_on(False)
+
+ # make offset box
+ offsetbox = AuxTransformBox(IdentityTransform())
+ offsetbox.add_artist(p)
+
+ # make anchored offset box
+ ao = AnchoredOffsetbox(loc=2, child=offsetbox, frameon=True, borderpad=0.2)
+
+ ax.add_artist(ao)
+
+
+
+ # EXAMPLE 2
+
+ ax = plt.subplot(212)
+
+ shadow1 = TextPatch((3, -2), "TextPath", size=70, fc="none", ec="0.6", lw=3,
+ transform=IdentityTransform())
+ shadow2 = TextPatch((3, -2), "TextPath", size=70, fc="0.3", ec="none",
+ transform=IdentityTransform())
+
+ arr = np.arange(256).reshape(1,256)/256.
+ text_path = TextPatch((0, 0), "TextPath", size=70, fc="none", ec="none", lw=1,
+ bbox_image=arr,
+ transform=IdentityTransform())
+
+ # make offset box
+ offsetbox = AuxTransformBox(IdentityTransform())
+ offsetbox.add_artist(shadow1)
+ offsetbox.add_artist(shadow2)
+ offsetbox.add_artist(text_path)
+
+ # place the anchored offset box using AnnotationBbox
+ ab = AnnotationBbox(offsetbox, (0.5, 0.5),
+ xycoords='data',
+ boxcoords="offset points",
+ box_alignment=(0.5,0.5),
+ )
+
+
+ ax.add_artist(ab)
+
+ ax.set_xlim(0, 1)
+ ax.set_ylim(0, 1)
+
+
+
+
+
+ plt.draw()
+ plt.show()
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