From: Rune V. Sjøen <rvsjoen@gm...>  20100328 11:14:51

Hello again, and thanks. I did not have a chance to look at this until now but using arc instead of angle worked out great. 2010/3/24 JaeJoon Lee <lee.j.joon@...> > You should not use "angle" style if you change the x,y position (this > is due to the algorithm of how the line connecting two points are > create). > > Try something like below instead. > > if foo: > if theta  foo < 10: > print >>sys.stderr, "Overlapping, offsetting a little bit" > y1 = y1 + 0.1 > if x1 > 0 : > cstyle="arc,angleA=180,armA=30,armB=10,angleB=%f"%(theta,) > else: > cstyle="arc,angleA=0,armA=30,armB=10,angleB=%f"%(theta,) > > There is not much documentation of how each algorithm works (it is > beyond my english skill). They are loosely based on the latex pstrick > package and the screenshot in the following link may be useful to get > some idea though. > > > http://matplotlib.sourceforge.net/users/annotations_guide.html#annotatingwitharrow > > Regards, > > JJ > > > 2010/3/24 Rune V. Sjøen <rvsjoen@...>: > > Hello again, and thank you very much for the answer, suddenly it all got > > much clearer to me. The only 'issue' I am having is (from screenshot) > what > > happens to the line pointing to Logs when I try to offset it a little bit > on > > the Y axis. It looks like either the angleA or angleB is wrong, but I > don't > > see and reason why it would be as the X coordinates does not change. > > > > Another thing I do not quite understand is what that patchB does. > > > > figure(1, figsize=(6,6)) > > ax = axes([0.1, 0.1, 0.8, 0.8]) > > > > labels = 'Frogs', 'Hogs', 'Dogs', 'Logs' > > fracs = [45, 135 ,1, 1] > > > > p = pie(fracs) > > > > foo = None > > for p1, l1 in zip(p[0], labels): > > > > r = p1.r > > dr = r*0.1 > > t1, t2 = p1.theta1, p1.theta2 > > theta = (t1+t2)/2. > > > > xc = cos(theta/180.*pi)*r > > yc = sin(theta/180.*pi)*r > > x1 = cos(theta/180.*pi)*(r+dr) > > y1 = sin(theta/180.*pi)*(r+dr) > > > > if x1 > 0 : > > x1 = r+2*dr > > ha, va = "left", "center" > > cstyle="angle,angleA=180,angleB=%f"%(theta,) > > print >> sys.stderr, ha, ",A,", va > > else: > > x1 = (r+2*dr) > > ha, va = "right", "center" > > cstyle="angle,angleA=0,angleB=%f"%(theta,) > > print >> sys.stderr, ha, ",B,", va > > > > if foo: > > if theta  foo < 10: > > print >>sys.stderr, "Overlapping, offsetting a little > > bit" > > y1 = y1 + 0.1 > > foo = theta > > > > annotate(l1, > > (xc, yc), xycoords="data", > > xytext=(x1, y1), textcoords="data", ha=ha, va=va, > > arrowprops=dict(arrowstyle="", > > connectionstyle=cstyle, > > patchB=p1)) > > > >  Rune > > > > 2010/3/23 JaeJoon Lee <lee.j.joon@...> > >> > >> This should be doable using the annotation. Here is a simple cookup I > >> just did. it uses a naive algorithm to place the labels, but I guess > >> it gives you an idea how things work. > >> a screenshot is attached. > >> > >> Regards, > >> > >> JJ > >> > >> > >> from pylab import * > >> > >> # make a square figure and axes > >> figure(1, figsize=(6,6)) > >> ax = axes([0.1, 0.1, 0.8, 0.8]) > >> > >> labels = 'Frogs', 'Hogs', 'Dogs', 'Logs' > >> fracs = [15,30,45, 10] > >> > >> explode=(0, 0.05, 0, 0) > >> p = pie(fracs, explode=explode, shadow=True) > >> title('Raining Hogs and Dogs', bbox={'facecolor':'0.8', 'pad':5}) > >> > >> for p1, l1 in zip(p[0], labels): > >> r = p1.r > >> dr = r*0.1 > >> t1, t2 = p1.theta1, p1.theta2 > >> theta = (t1+t2)/2. > >> > >> xc, yc = r/2.*cos(theta/180.*pi), r/2.*sin(theta/180.*pi) > >> x1, y1 = (r+dr)*cos(theta/180.*pi), (r+dr)*sin(theta/180.*pi) > >> if x1 > 0 : > >> x1 = r+2*dr > >> ha, va = "left", "center" > >> tt = 180 > >> cstyle="angle,angleA=0,angleB=%f"%(theta,) > >> else: > >> x1 = (r+2*dr) > >> ha, va = "right", "center" > >> tt = 0 > >> cstyle="angle,angleA=0,angleB=%f"%(theta,) > >> > >> annotate(l1, > >> (xc, yc), xycoords="data", > >> xytext=(x1, y1), textcoords="data", ha=ha, va=va, > >> arrowprops=dict(arrowstyle="", > >> connectionstyle=cstyle, > >> patchB=p1)) > >> > >> show() > > > > > 