Dear all,
I have now implemented the draw_path_collection, draw_quad_mesh, and
draw_markers methods in the Mac OS X native backend (see patch 2179017 at
http://sourceforge.net/tracker/?func=detail&atid=560722&aid=2179017&group_id=80706).
Some timings are below. In terms of raw drawing speed, the native backend can
be either faster or slower than agg. On the other hand, the native backend can
be considerably faster if the agg backend uses many calls to draw(); the native
backend can avoid these superfluous because it has complete control over the
event loop (see the third example below).
Best,
--Michiel.
# Scatter plot
n = 1e6
import matplotlib.pyplot as plt
f=plt.figure()
import numpy as np
x=np.arange(n)
y=np.sin(x)
ax=f.add_subplot(111)
plt.scatter(x,y,c=x**2.0)
# Time in seconds
# n 100,000 1,000,000 2,000,000 3,000,000
# MacOSX 6 45 92 140
# WxAgg 7 56 112 172
# TkAgg 9 56 113 172
# GtkAgg 7 55 111 173
# Quad mesh
import numpy as np
from matplotlib.pyplot import figure, show, savefig
from matplotlib import cm, colors
from numpy import ma
n = 1000
x = np.cos(np.linspace(-1.5,1.5,n))
y = np.linspace(-1.5,1.5,n*2)
X,Y = np.meshgrid(x,y);
Qx = np.sin(Y**2) - np.cos(X)
Qz = np.sin(Y) + np.sin(X)
Qx = (Qx + 1.1)
Z = np.sqrt(X**2 + Y**3)/5;
Z = (Z - Z.min()) / (Z.max() - Z.min())
# The color array can include masked values:
Zm = ma.masked_where(np.fabs(Qz) < 0.5*np.amax(Qz), Z)
fig = figure()
ax = fig.add_subplot(111)
ax.set_axis_bgcolor("#bdb76b")
ax.pcolormesh(Qx,Qz,Z)
show()
# Timings in seconds
# n Mac OS X TkAgg
# 500 6 6
# 1000 23 7
# 2000 138 40
# Subplots
from pylab import *
figure()
x=np.arange(20)
y=1+x**2
n = 4
for i in range(n*n):
subplot(n,n,i+1)
bar(x,y,log=True)
xlim(-5,25)
ylim(1,1e4)
# Timings in seconds
# n Mac OS X TkAgg
# 2 2 6
# 3 3 23
# 4 5 66
--- On Tue, 10/28/08, Michiel de Hoon <mjldeh...@yahoo.com> wrote:
> --- On Tue, 10/28/08, John Hunter <jdh2...@gmail.com>
> wrote:
> > I haven't had a chance to look at the code yet,
> > but I suspect he hasn't implemented the
> > path collection draw method. If it's not
> > implemented, we fall back on drawing each path
> > separately, which is a lot slower. scatter ultimately
> > triggers a call to Renderer.draw_path_collection
> > which has a default implementation and a specialization
> > in backend_agg.
>
> Good point. Indeed I was not aware of the
> draw_path_collection method and I have not implemented it. I
> will implement this method and report back with the timings
> for Eric's example.
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