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Issue 25959: Explain in docstring that PhotoImage.zoom arguments are

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multipliers, not final sizes.  Explain y default for .zoom and .subsample.
Initial patch by Serhiy Storchaka.
This commit is contained in:
Terry Jan Reedy 2016-03-11 15:30:35 -05:00
parent 29bf27fe7f
commit ca0250a878
1 changed files with 8 additions and 4 deletions
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12
Lib/tkinter/__init__.py
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@ -3407,16 +3407,20 @@ class PhotoImage(Image):
destImage = PhotoImage(master=self.tk) destImage = PhotoImage(master=self.tk)
self.tk.call(destImage, 'copy', self.name) self.tk.call(destImage, 'copy', self.name)
return destImage return destImage
def zoom(self,x,y=''): def zoom(self, x, y=''):
"""Return a new PhotoImage with the same image as this widget """Return a new PhotoImage with the same image as this widget
but zoom it with X and Y.""" but zoom it with a factor of x in the X direction and y in the Y
direction. If y is not given, the default value is the same as x.
"""
destImage = PhotoImage(master=self.tk) destImage = PhotoImage(master=self.tk)
if y=='': y=x if y=='': y=x
self.tk.call(destImage, 'copy', self.name, '-zoom',x,y) self.tk.call(destImage, 'copy', self.name, '-zoom',x,y)
return destImage return destImage
def subsample(self,x,y=''): def subsample(self, x, y=''):
"""Return a new PhotoImage based on the same image as this widget """Return a new PhotoImage based on the same image as this widget
but use only every Xth or Yth pixel.""" but use only every Xth or Yth pixel. If y is not given, the
default value is the same as x.
"""
destImage = PhotoImage(master=self.tk) destImage = PhotoImage(master=self.tk)
if y=='': y=x if y=='': y=x
self.tk.call(destImage, 'copy', self.name, '-subsample',x,y) self.tk.call(destImage, 'copy', self.name, '-subsample',x,y)