def autobounds(pars):
"""
if pars is an nexponential parameter vector, return bounds
assuming the sign of the amplitude guess and positive rate
contants. return value is a len(pars) list of (pmin, pmax) bounds
"""
pos = 0., None
neg = None, 0.
bounds = []
for a, alpha in cbook.pieces(pars):
if a<0: abounds = neg
else: abounds = pos
bounds.append(abounds) # amplitude bounds
bounds.append(pos) # alpha bounds strictly pos
return bounds
def _set_gd_style(self, gc):
color = self.get_gd_color( gc.get_rgb() )
offset, dashes = gc.get_dashes()
if dashes is not None:
pixels = self.points_to_pixels(dashes)
style = []
for on, off in pieces(pixels):
if on<1: on = 1
else: on = round(on)
if off<1: off = 1
else: off = round(off)
style.extend([color]*on)
style.extend([gd.gdTransparent]*off)
self.im.setStyle(style)
return gd.gdStyled
else:
if gc.get_antialiased():
self.im.setAntiAliased(color)
return gd.gdAntiAliased
else:
self.im.setStyle([color])
return gd.gdStyled
def _set_gd_style(self, gc):
color = self.get_gd_color(gc.get_rgb())
offset, dashes = gc.get_dashes()
if dashes is not None:
pixels = self.points_to_pixels(dashes)
style = []
for on, off in pieces(pixels):
if on < 1: on = 1
else: on = round(on)
if off < 1: off = 1
else: off = round(off)
style.extend([color] * on)
style.extend([gd.gdTransparent] * off)
self.im.setStyle(style)
return gd.gdStyled
else:
if gc.get_antialiased():
self.im.setAntiAliased(color)
return gd.gdAntiAliased
else:
self.im.setStyle([color])
return gd.gdStyled