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”
···
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Today’s Topics:
- pick event (Arek Kedzior)
- Re: pick event (Jerzy Karczmarczuk)
- 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
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<1336828057.20499.YahooMailNeo@…83…4083…>
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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
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<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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