Matplotlib-users Digest, Vol 72, Issue 10

If you pick one of the curves in the close location to tangancy area, the OnPick function will be ececuted twice (2 curves) and will display 2 markers. I want to find the shortest distance from the pick location (mouse coord.) to a discrete point on the curve and draw marker on the curve at this location (only one). See the line with “print lineObj”

···

From: "matplotlib-users-request@lists.sourceforge.net" matplotlib-users-request@lists.sourceforge.net
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Sent: Saturday, May 12, 2012 10:59 AM
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Today’s Topics:

  1. pick event (Arek Kedzior)
  2. Re: pick event (Jerzy Karczmarczuk)
  3. Re: pick event (Benjamin Root)

Message: 1
Date: Sat, 12 May 2012 06:07:37 -0700 (PDT)
From: Arek Kedzior <akedzior@…9…>
Subject: [Matplotlib-users] pick event
To: "matplotlib-users@lists.sourceforge.net"
matplotlib-users@lists.sourceforge.net
Message-ID:
<1336828057.20499.YahooMailNeo@…83…4083…>
Content-Type: text/plain; charset=“iso-8859-1”

I am trying to use pick event.? See the simple script
below.? I am interested to find the shortest distance between pick
point (mouse coord.) and the ?line at the discrete points only (points on
the curve from data)
What am I doing wrong ?
Regards,
Arek
?
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.lines import Line2D
import math as math
?

create figure and attach axes to it

fig = plt.figure(1)
ax = fig.add_subplot(111)
?
?
def getMinDistance(xmouse, ymouse,
xList, yList):
??? “”"
??? find shortest distance between mouse
coordinates and pick point
??? point pick may be a list of points if
data is clouded
??? Input
??? xmouse - x coordinate of mouse (x - pick)
??? ymouse - y coordinate of mouse (y - pick)
??? xList? - xData from curve
??? yList? - yData from curve
??? Returns:
??? dmin? - minimum distance
??? index - index of data point in the xList
and yList
??? “”"
???dmin? = math.sqrt((xList[0] -
xmouse)**2. + (yList[0]-ymouse)**2.)?
???index = 0
??? for idx in range(1,len(xList)):
??? d =
math.sqrt((xList[idx] - xmouse)**2. + (yList[idx]-ymouse)**2.)
??? if(d < dmin):
???
dmin = d
???
index = idx
???return dmin, index
?
def showMarker(x, y, color):
??? “”"
??? draw marker at loction x, y with color
??? “”"
??? # draw marker
??? markerOn, = ax.plot(x, y, ‘o’, color

color)
???
def OnPick(event):
??? “”"
??? pick event
??? “”"
??? print ‘****************************’
??? mouseEvent = event.mouseevent
??? # get pick coord
??? xmouse, ymouse = mouseEvent.xdata,
mouseEvent.ydata
??? # get the artist
??? lineObj = event.artist
???print lineObj
???if not isinstance(lineObj, Line2D):
??? return
???ind = event.ind
???# check if indexes exist of the pick
object
??? N = len(ind)
??? if not N:
??? return
??? # get curve picked data
??? Xdata, Ydata = lineObj.get_data()
??? color = lineObj.get_color()
???xLi = np.take(Xdata, ind)
??? yLi = np.take(Ydata, ind)
??? dmin, index = getMinDistance(xmouse,
ymouse, xLi, yLi)
???
???xP = xLi[index]
??? yP = yLi[index]
???
???xStr = ‘%.4g’ % xP
??? yStr = ‘%.4g’ % yP
??? txt = 'X = ’ + xStr + ’ ;? ’ + 'Y =
’ + yStr
??? print txt
??? # show
marker
??? showMarker(xP, yP, color)
??? # redraw to show marker
??? fig.canvas.draw()
???

connect to pick event???

fig.canvas.mpl_connect(‘pick_event’,OnPick)
?

generate data for display

x = np.arange(-4,4,0.1)??? # x-
coord
y2 = x**2 + 5.0???

y coord of first curve

y? = 2*x +
4.0???

y coord of the second curve

create the list of x and y data

xList = [x,
x]???
yList = [y, y2]
objList = []??? # store draw lines
(artists)

display 2 curves

for idx in range(len(xList)):
??? obj, = ax.plot(xList[idx], yList[idx],
picker = 5)
??? objList.append(obj)
?

display plot

plt.show(1)
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Message: 2
Date: Sat, 12 May 2012 16:44:16 +0200
From: Jerzy Karczmarczuk <jerzy.karczmarczuk@…3937…>
Subject: Re: [Matplotlib-users] pick event
To: matplotlib-users@lists.sourceforge.net
Message-ID: <4FAE7740.7070709@…3937…>
Content-Type: text/plain; charset=“iso-8859-1”

Arek Ke;dzior:

I am trying to use pick event.

What am I doing wrong ?
Wrong with WHAT?
What do you expect?

Jerzy Karczmarczuk

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Message: 3
Date: Sat, 12 May 2012 10:59:39 -0400
From: Benjamin Root <ben.root@…1304…>
Subject: Re: [Matplotlib-users] pick event
To: “jerzy.karczmarczuk@…3937…” <jerzy.karczmarczuk@…3937…>
Cc: "matplotlib-users@lists.sourceforge.net"
matplotlib-users@lists.sourceforge.net
Message-ID:
<CANNq6FnEP7Ugwvfj5FmVAyqsqyzhcc4bZg95J1Gzf_sq=2hK_g@…288…>
Content-Type: text/plain;
charset=“utf-8”

On Saturday, May 12, 2012, Jerzy Karczmarczuk wrote:

Arek K?dzior:

I am trying to use pick event.

What am I doing wrong ?

Wrong with WHAT?
What do you expect?

Jerzy Karczmarczuk

Arek.

Could you provide a little more detail about your issue?

Cheers!
Ben Root
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