class skimage.viewer.canvastools.RectangleTool(manager, on_move=None, on_release=None, on_enter=None, maxdist=10, rect_props=None) [source]
 
Bases: skimage.viewer.canvastools.base.CanvasToolBase, matplotlib.widgets.RectangleSelector Widget for selecting a rectangular region in a plot. After making the desired selection, press “Enter” to accept the selection and call the on_enter callback function.  Parameters 
 
managerViewer or PlotPlugin. 

Skimage viewer or plot plugin object.  
on_movefunction 

Function called whenever a control handle is moved. This function must accept the rectangle extents as the only argument.  
on_releasefunction 

Function called whenever the control handle is released.  
on_enterfunction 

Function called whenever the “enter” key is pressed.  
maxdistfloat 

Maximum pixel distance allowed when selecting control handle.  
rect_propsdict 

Properties for matplotlib.patches.Rectangle. This class redefines defaults in matplotlib.widgets.RectangleSelector.     Examples >>> from skimage import data
>>> from skimage.viewer import ImageViewer
>>> from skimage.viewer.canvastools import RectangleTool
>>> from skimage.draw import line
>>> from skimage.draw import set_color
 >>> viewer = ImageViewer(data.coffee())  
 >>> def print_the_rect(extents):
...     global viewer
...     im = viewer.image
...     coord = np.int64(extents)
...     [rr1, cc1] = line(coord[2],coord[0],coord[2],coord[1])
...     [rr2, cc2] = line(coord[2],coord[1],coord[3],coord[1])
...     [rr3, cc3] = line(coord[3],coord[1],coord[3],coord[0])
...     [rr4, cc4] = line(coord[3],coord[0],coord[2],coord[0])
...     set_color(im, (rr1, cc1), [255, 255, 0])
...     set_color(im, (rr2, cc2), [0, 255, 255])
...     set_color(im, (rr3, cc3), [255, 0, 255])
...     set_color(im, (rr4, cc4), [0, 0, 0])
...     viewer.image=im
 >>> rect_tool = RectangleTool(viewer, on_enter=print_the_rect) 
>>> viewer.show() 
  Attributes 
 
extentstuple 

Return (xmin, xmax, ymin, ymax).      
__init__(manager, on_move=None, on_release=None, on_enter=None, maxdist=10, rect_props=None) [source]
 
 Parameters 
 
axAxes 

The parent axes for the widget.  
onselectfunction 

A callback function that is called after a selection is completed. It must have the signature: def onselect(eclick: MouseEvent, erelease: MouseEvent)
 where eclick and erelease are the mouse click and release MouseEvents that start and complete the selection.  
drawtype{“box”, “line”, “none”}, default: “box” 

Whether to draw the full rectangle box, the diagonal line of the rectangle, or nothing at all.  
minspanxfloat, default: 0 

Selections with an x-span less than minspanx are ignored.  
minspanyfloat, default: 0 

Selections with an y-span less than minspany are ignored.  
useblitbool, default: False 

Whether to use blitting for faster drawing (if supported by the backend).  
linepropsdict, optional 

Properties with which the line is drawn, if drawtype == "line". Default: dict(color="black", linestyle="-", linewidth=2, alpha=0.5)
  
rectpropsdict, optional 

Properties with which the rectangle is drawn, if drawtype ==
"box". Default: dict(facecolor="red", edgecolor="black", alpha=0.2, fill=True)
  
spancoords{“data”, “pixels”}, default: “data” 

Whether to interpret minspanx and minspany in data or in pixel coordinates.  
buttonMouseButton, list of MouseButton, default: all buttons 

Button(s) that trigger rectangle selection.  
maxdistfloat, default: 10 

Distance in pixels within which the interactive tool handles can be activated.  
marker_propsdict 

Properties with which the interactive handles are drawn. Currently not implemented and ignored.  
interactivebool, default: False 

Whether to draw a set of handles that allow interaction with the widget after it is drawn.  
state_modifier_keysdict, optional 

Keyboard modifiers which affect the widget’s behavior. Values amend the defaults.  “move”: Move the existing shape, default: no modifier. “clear”: Clear the current shape, default: “escape”. “square”: Makes the shape square, default: “shift”. “center”: Make the initial point the center of the shape, default: “ctrl”.  “square” and “center” can be combined.     
  
property corners  
Corners of rectangle from lower left, moving clockwise. 
  
property edge_centers  
Midpoint of rectangle edges from left, moving clockwise. 
  
property extents  
Return (xmin, xmax, ymin, ymax). 
  
property geometry  
Geometry information that gets passed to callback functions. 
  
on_mouse_press(event) [source]

  
on_mouse_release(event) [source]

  
on_move(event) [source]