matplotlib-users Mailing List for matplotlib

Arek Ke;dzior:
> If you pick one of the curves in the close location to tangancy area, 
> the OnPick function will be executed 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"
Ok, now I -- perhaps -- understand.
This is a speculation...

Your approach cannot work, since the low level event handling issues TWO 
pick events, one for each curve. Everything works very well, your 
program finds the appropriate point ... on both curves, separately.

I suggest that you try to react to lower level mouse events. Look into 
the Pick code within the Artist class. The system tries to pick all the 
children, and here - I believe - resides your problem. You should 
perhaps discriminate the picked target at this point.

Jerzy Karczmarczuk

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: "mat...@li..." <mat...@li...>
To: mat...@li... 
Sent: Saturday, May 12, 2012 10:59 AM
Subject: Matplotlib-users Digest, Vol 72, Issue 10
  
Send Matplotlib-users mailing list submissions to
    mat...@li...

To subscribe or unsubscribe via the World Wide Web, visit
    https://lists.sourceforge.net/lists/listinfo/matplotlib-users
or, via email, send a message with subject or body 'help' to
    mat...@li...

You can reach the person managing the list at
    mat...@li...

When replying, please edit your Subject line so it is more specific
than "Re: Contents of Matplotlib-users digest..."


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 <ake...@ya...>
Subject: [Matplotlib-users] pick event
To: "mat...@li..."
    <mat...@li...>
Message-ID:
    <133...@we...>
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)
-------------- next part --------------
An HTML attachment was scrubbed...

------------------------------

Message: 2
Date: Sat, 12 May 2012 16:44:16 +0200
From: Jerzy Karczmarczuk <jer...@un...>
Subject: Re: [Matplotlib-users] pick event
To: mat...@li...
Message-ID: <4FA...@un...>
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

-------------- next part --------------
An HTML attachment was scrubbed...

------------------------------

Message: 3
Date: Sat, 12 May 2012 10:59:39 -0400
From: Benjamin Root <ben...@ou...>
Subject: Re: [Matplotlib-users] pick event
To: "jer...@un..." <jer...@un...>
Cc: "mat...@li..."
    <mat...@li...>
Message-ID:
    <CAN...@ma...>
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
-------------- next part --------------
An HTML attachment was scrubbed...

------------------------------

------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/

------------------------------

_______________________________________________
Matplotlib-users mailing list
Mat...@li...
https://lists.sourceforge.net/lists/listinfo/matplotlib-users


End of 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: "mat...@li..." <mat...@li...>
To: mat...@li... 
Sent: Saturday, May 12, 2012 10:59 AM
Subject: Matplotlib-users Digest, Vol 72, Issue 10
  
Send Matplotlib-users mailing list submissions to
    mat...@li...

To subscribe or unsubscribe via the World Wide Web, visit
    https://lists.sourceforge.net/lists/listinfo/matplotlib-users
or, via email, send a message with subject or body 'help' to
    mat...@li...

You can reach the person managing the list at
    mat...@li...

When replying, please edit your Subject line so it is more specific
than "Re: Contents of Matplotlib-users digest..."


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 <ake...@ya...>
Subject: [Matplotlib-users] pick event
To: "mat...@li..."
    <mat...@li...>
Message-ID:
    <133...@we...>
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)
-------------- next part --------------
An HTML attachment was scrubbed...

------------------------------

Message: 2
Date: Sat, 12 May 2012 16:44:16 +0200
From: Jerzy Karczmarczuk <jer...@un...>
Subject: Re: [Matplotlib-users] pick event
To: mat...@li...
Message-ID: <4FA...@un...>
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

-------------- next part --------------
An HTML attachment was scrubbed...

------------------------------

Message: 3
Date: Sat, 12 May 2012 10:59:39 -0400
From: Benjamin Root <ben...@ou...>
Subject: Re: [Matplotlib-users] pick event
To: "jer...@un..." <jer...@un...>
Cc: "mat...@li..."
    <mat...@li...>
Message-ID:
    <CAN...@ma...>
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
-------------- next part --------------
An HTML attachment was scrubbed...

------------------------------

------------------------------------------------------------------------------
Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and 
threat landscape has changed and how IT managers can respond. Discussions 
will include endpoint security, mobile security and the latest in malware 
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/

------------------------------

_______________________________________________
Matplotlib-users mailing list
Mat...@li...
https://lists.sourceforge.net/lists/listinfo/matplotlib-users


End of Matplotlib-users Digest, Vol 72, Issue 10
************************************************

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

>  Arek Kędzior:
>
>   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

Arek Ke;dzior:
> I am trying to use pick event.
...
> What am I doing wrong ?
Wrong with WHAT?
What do you expect?

Jerzy Karczmarczuk

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)