Hi,
I'm plotting thousands of short lines on a plot. Because "plot" and "Line2D"
are quite slow for this case, I'm trying to use lineCollection. Here comes the
part of my testing code:
...
segs = []
# Manual set for testing
x2 = np.zeros(2,dtype=int)
ys2 = [np.zeros(2,dtype=float)]
x2[0] = 1000000
x2[1] = 2000000
ys2[0][0] = ys2[0][1] = 50
segs.extend( [zip(x2,y) for y in ys2] )
for i in range(0, len(records)):
...
# get xStart, xEnd, and y
...
x2[0] = xStart
x2[1] = xEnd
ys2[0][0] = ys2[0][1] = y
segs.extend( [zip(x2,y) for y in ys2] )
line_segments = LineCollection(segs, linewidth=4, alpha=0.3, colors = 'r',
linestyle = 'solid')
ax.add_collection(line_segments)
...
The problem I have is only the first segment of the lines in the "segs" which I
manually set the values is shown in the plot. If I move the first part in the
for loop to test, it works. What am I missing?
Thank you in advance.
Jin
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