Revision: 6435
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=6435&view=rev
Author: jdh2358
Date: 2008-11-23 19:16:40 +0000 (Sun, 23 Nov 2008)
Log Message:
-----------
remove deprecated fill example
Removed Paths:
-------------
trunk/matplotlib/examples/pylab_examples/fill_between_posneg.py
Deleted: trunk/matplotlib/examples/pylab_examples/fill_between_posneg.py
===================================================================
--- trunk/matplotlib/examples/pylab_examples/fill_between_posneg.py
2008-11-23 19:15:01 UTC (rev 6434)
+++ trunk/matplotlib/examples/pylab_examples/fill_between_posneg.py
2008-11-23 19:16:40 UTC (rev 6435)
@@ -1,101 +0,0 @@
-#!/usr/bin/env python
-"""
-From: James Boyle <[EMAIL PROTECTED]>
-Subject: possible candidate for examples directory using fill
-To: John Hunter <[EMAIL PROTECTED]>
-Date: Tue, 8 Mar 2005 15:44:11 -0800
-
-I often compare the output from two sensors and I am interested in the
-sign of the differences.
-
-I wrote the enclosed code for find the polygons of the positive and
-negative regions of the difference of two curves. It is written for
-simple-minded straightforwardness rather than speed or elegance.
-It is easy to fill in the two sets of polygons with contrasting colors.
-For efficiency one could use collections but my curves are such that
-fill is quick enough.
-
-The code uses a simple linear technique to find the crossover point,
-this too could be made more sophisticated if one desired.
-
-I have found this code to be very handy for the comparisons I perform
--
-maybe someone else would find it useful.
-
---Jim
-"""
-
-#!/usr/bin/env python
-
-from pylab import *
-
-def findZero(i,x,y1,y2):
- im1 = i-1
- m1 = (y1[i] - y1[im1])/(x[i] - x[im1])
- m2 = (y2[i] - y2[im1])/(x[i] - x[im1])
- b1 = y1[im1] - m1*x[im1]
- b2 = y2[im1] - m2*x[im1]
- xZero = (b1 - b2)/(m2 - m1)
- yZero = m1*xZero + b1
- return (xZero, yZero)
-
-def posNegFill(x,y1,y2):
- diff = y2 - y1
- pos = []
- neg = []
- xx1 = [x[0]]
- xx2 = [x[0]]
- yy1 = [y1[0]]
- yy2 = [y2[0]]
- oldSign = (diff[0] < 0 )
- npts = x.shape[0]
- for i in range(1,npts):
- newSign = (diff[i] < 0)
- if newSign != oldSign:
- xz,yz = findZero(i,x,y1,y2)
- xx1.append(xz)
- yy1.append(yz)
- xx2.reverse()
- xx1.extend(xx2)
- yy2.reverse()
- yy1.extend(yy2)
- if oldSign:
- neg.append( (xx1,yy1) )
- else:
- pos.append( (xx1,yy1) )
- xx1 = [xz,x[i]]
- xx2 = [xz,x[i]]
- yy1 = [yz,y1[i]]
- yy2 = [yz,y2[i]]
- oldSign = newSign
- else:
- xx1.append( x[i])
- xx2.append( x[i])
- yy1.append(y1[i])
- yy2.append(y2[i])
- if i == npts-1:
- xx2.reverse()
- xx1.extend(xx2)
- yy2.reverse()
- yy1.extend(yy2)
- if oldSign :
- neg.append( (xx1,yy1) )
- else:
- pos.append( (xx1,yy1) )
- return pos,neg
-
-x1 = arange(0, 2, 0.01)
-y1 = sin(2*pi*x1)
-y2 = sin(4*pi*x1)
-
-# find positive and negative polygons of difference
-pos,neg = posNegFill(x1,y1,y2)
-# positive y2 > y1 is blue
-for x,y in pos:
- p = fill(x,y,'b')
-
-# negative Y2 < y1 is red
-for x,y in neg:
- p = fill(x,y,'r')
-
-show()
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