matplotlib-users Mailing List for matplotlib

from matplotlib.widgets import Lasso
It might not of made the last release.
http://svn.sourceforge.net/viewvc/matplotlib/trunk/matplotlib/lib/matplotlib/widgets.py?revision=2583&view=markup

On 8/7/06, Daniel Kornhauser <kor...@re...> wrote:
> Hey guys:
>
> Charlie I did not find your lasso example so I cooked up mine, I attach it.
> Can you give me the file name that contains the new Lasso widget for
> "doodling" ?
>
> This is just the start of the lasso or "region of interest" widget I
> still have to :
>     - fill the region with a color
>     - make it work with layers
>     - add methods that return the pixel region or the contour coordinates
>     - make a nice class
>
> If anybody has made such a widget I would love to see the code, I hate
> reinventing the wheel.
>
> If there is not such an example such as the lasso tool, can my example
> be added to the examples ?
> What is the process ?
>
> Anyway, I can't believe there is not such a widget, I thought there must
> be some people that use matplotlib for Digital Image Processing ?
> Isn't there ?
>
> Any critique on my code would be appreciated, I have never programed
> with matplotlib ...
>
>
>                                                                    Daniel.
>
>
>
>
> Charlie Moad wrote:
> > On 8/4/06, Daniel Kornhauser <kor...@re...> wrote:
> >> Hi:
> >>
> >> Just stared playing with matplotlib, I want to draw a polygon on top of
> >> an image to select a region of interest in the image.
> >> Does anybody have any example or advice on how to interactively draw a
> >> polygon with the mouse by placing it's vertices's one click at a time ?
> >> Another case that I have would be just to fill a region with a thick
> >> line, searched for a "doodle example" or a "paint example" but could not
> >> find them, any advice would be appreciated too.
> >
> > Look in at the widget examples.  There is a new Lasso widget for
> > "doodling" and a RectangleSelector.
> >
> > - Charlie
>
>
>
> #!/usr/bin/env python
> """
> This example shows how to use matplotlib to create regions of interest.
> I has two modes:
>      - the segment mode, each time you click the mouse you can create a line segment
>      - the free hand mode, by keeping pressed the right button you can create a iregular contour
> The right button closes the loop.
> Daniel Kornhauser
> """
> from pylab import *
>
> class ROI:
>
>     def __init__(self, ax, fig):
>         self.previous_point = []
>         self.start_point = []
>         self.end_point = []
>         self.line = None
>
>         self.fig =  fig
>         self.fig.canvas.draw()
>
>     def motion_notify_callback(self, event):
>         if event.inaxes:
>             ax = event.inaxes
>             x, y = event.xdata, event.ydata
>             if event.button == None and self.line != None: # Move line around
>                 self.line.set_data([self.previous_point[0], x],
>                                    [self.previous_point[1], y])
>                 self.fig.canvas.draw()
>             elif event.button == 1: # Free Hand Drawing
>                     line = Line2D([self.previous_point[0], x],
>                                   [self.previous_point[1], y])
>                     ax.add_line(line)
>                     self.previous_point = [x, y]
>                     self.fig.canvas.draw()
>
>
>     def button_press_callback(self, event):
>         if event.inaxes:
>             x, y = event.xdata, event.ydata
>             ax = event.inaxes
>             if event.button == 1:  # If you press the right button
>                     if self.line == None: # if there is no line, create a line
>                         self.line = Line2D([x,  x],
>                                            [y, y],
>                                            marker = 'o')
>                         self.start_point = [x,y]
>                         self.previous_point =  self.start_point
>                         ax.add_line(self.line)
>                         self.fig.canvas.draw()
>                     # add a segment
>                     else: # if there is a line, create a segment
>                         self.line = Line2D([self.previous_point[0], x],
>                                            [self.previous_point[1], y],
>                                            marker = 'o')
>                         self.previous_point = [x,y]
>                         event.inaxes.add_line(self.line)
>                         self.fig.canvas.draw()
>
>             elif event.button == 3 and self.line != None: # close the loop
>                         self.line.set_data([self.previous_point[0], self.start_point[0]],
>                                            [self.previous_point[1], self.start_point[1]])
>                         ax.add_line(self.line)
>                         self.fig.canvas.draw()
>                         self.line = None
>
> def main():
>     fig = figure()
>     ax = fig.add_subplot(111)
>     ax.set_title(" left click: line segment       left pressed: doodle        right click: close region")
>     cursor = ROI(ax, fig)
>     fig.canvas.mpl_connect('motion_notify_event', cursor.motion_notify_callback)
>     fig.canvas.mpl_connect('button_press_event', cursor.button_press_callback)
>     show()
>
> if __name__ == "__main__":
>     main()
>
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>

Hey guys:

Charlie I did not find your lasso example so I cooked up mine, I attach it.
Can you give me the file name that contains the new Lasso widget for  
"doodling" ?

This is just the start of the lasso or "region of interest" widget I 
still have to :
    - fill the region with a color
    - make it work with layers
    - add methods that return the pixel region or the contour coordinates
    - make a nice class

If anybody has made such a widget I would love to see the code, I hate 
reinventing the wheel.

If there is not such an example such as the lasso tool, can my example 
be added to the examples ?
What is the process ?

Anyway, I can't believe there is not such a widget, I thought there must 
be some people that use matplotlib for Digital Image Processing ?
Isn't there ?

Any critique on my code would be appreciated, I have never programed 
with matplotlib ...


                                                                   Daniel.




Charlie Moad wrote:
> On 8/4/06, Daniel Kornhauser <kor...@re...> wrote:
>> Hi:
>>
>> Just stared playing with matplotlib, I want to draw a polygon on top of
>> an image to select a region of interest in the image.
>> Does anybody have any example or advice on how to interactively draw a
>> polygon with the mouse by placing it's vertices's one click at a time ?
>> Another case that I have would be just to fill a region with a thick
>> line, searched for a "doodle example" or a "paint example" but could not
>> find them, any advice would be appreciated too.
>
> Look in at the widget examples.  There is a new Lasso widget for
> "doodling" and a RectangleSelector.
>
> - Charlie