def save(self, filename, format='auto', backend='auto', backend_options={}):
if format == 'auto':
format = filename.split('.')[-1]
if backend == 'auto':
if format == 'png':
backend = 'image'
else:
backend = 'cairo'
# Create the backend instance
if backend == 'image':
backend = MathtexBackendImage()
elif backend == 'cairo':
if not HAVE_CAIRO_BACKEND:
raise RuntimeError("Cairo backend requested when not available.")
backend = MathtexBackendCairo()
# Set the options for the backend
backend.options = backend_options
# Render!
self.render_to_backend(backend)
# Save
backend.save(filename, format)
def as_rgba_bitmap(self):
"""
Renders the expression to an RGBA bitmap using the Image backend and
returns it.
"""
backend = MathtexBackendImage()
self.render_to_backend(backend)
return backend.as_rgba()
def as_rgba_bitmap(self):
"""
Renders the expression to an RGBA bitmap using the Image backend and
returns it.
"""
backend = MathtexBackendImage()
self.render_to_backend(backend)
return backend.as_rgba()
def as_mask(self):
"""
Renders the expression to an alpha mask using the Image backend.
The result is returned as a numpy array.
"""
backend = MathtexBackendImage()
self.render_to_backend(backend)
return backend.as_mask()
def as_mask(self):
"""
Renders the expression to an alpha mask using the Image backend.
The result is returned as a numpy array.
"""
backend = MathtexBackendImage()
self.render_to_backend(backend)
return backend.as_mask()
def _draw_mathtext(self, gc, x, y, s, prop, angle):
if not HAVE_MATHTEX:
return
m = Mathtex(s, matplotlib.rcParams['mathtext.fontset'],
prop.get_size_in_points(), self.dpi, rcParams['mathtext.default'],
cache=True)
b = MathtexBackendImage()
m.render_to_backend(b)
width, height = m.width, m.height + m.depth
font_image = b.image
if angle==90:
width, height = height, width
x -= width
y -= height
imw = font_image.get_width()
imh = font_image.get_height()
N = imw * imh
# a numpixels by num fonts array
Xall = npy.zeros((N,1), npy.uint8)
image_str = font_image.as_str()
Xall[:,0] = npy.fromstring(image_str, npy.uint8)
# get the max alpha at each pixel
Xs = npy.amax(Xall,axis=1)
# convert it to it's proper shape
Xs.shape = imh, imw
pixbuf = gtk.gdk.Pixbuf(gtk.gdk.COLORSPACE_RGB, has_alpha=True,
bits_per_sample=8, width=imw, height=imh)
array = pixbuf_get_pixels_array(pixbuf)
rgb = gc.get_rgb()
array[:,:,0]=int(rgb[0]*255)
array[:,:,1]=int(rgb[1]*255)
array[:,:,2]=int(rgb[2]*255)
array[:,:,3]=Xs
try: # new in 2.2
# can use None instead of gc.gdkGC, if don't need clipping
self.gdkDrawable.draw_pixbuf (gc.gdkGC, pixbuf, 0, 0,
int(x), int(y), imw, imh,
gdk.RGB_DITHER_NONE, 0, 0)
except AttributeError:
# deprecated in 2.2
pixbuf.render_to_drawable(self.gdkDrawable, gc.gdkGC, 0, 0,
int(x), int(y), imw, imh,
gdk.RGB_DITHER_NONE, 0, 0)
def save(self,
filename,
format='auto',
backend='auto',
backend_options={}):
if format == 'auto':
format = filename.split('.')[-1]
if backend == 'auto':
if format == 'png':
backend = 'image'
else:
backend = 'cairo'
# Create the backend instance
if backend == 'image':
backend = MathtexBackendImage()
elif backend == 'cairo':
if not HAVE_CAIRO_BACKEND:
raise RuntimeError(
"Cairo backend requested when not available.")
backend = MathtexBackendCairo()
# Set the options for the backend
backend.options = backend_options
# Render!
self.render_to_backend(backend)
# Save
backend.save(filename, format)
def draw_mathtext(self, gc, x, y, s, prop, angle):
"""
Draw the math text using mathtex.mathtex_main
"""
if __debug__: verbose.report('RendererAgg.draw_mathtext',
'debug-annoying')
if HAVE_MATHTEX:
m = Mathtex(s, rcParams['mathtext.fontset'], prop.get_size_in_points(),
self.dpi, rcParams['mathtext.default'], cache=True)
b = MathtexBackendImage()
m.render_to_backend(b)
self._renderer.draw_text_image(b.image, int(x), int(y) + 1, angle, gc)
def _draw_mathtext(self, gc, x, y, s, prop, angle):
if not HAVE_MATHTEX:
return
m = Mathtex(s,
rcParams['mathtext.fontset'],
prop.get_size_in_points(),
self.dpi,
rcParams['mathtext.default'],
cache=True)
b = MathtexBackendImage()
m.render_to_backend(b)
gc.draw_mathtext(x, y, angle, 255 - b.image.as_array())
