if imgwide <= scrwide and imghigh <= scrhigh: # too big for display?
self.state('normal') # no: win size per img
elif sys.platform[:3] == 'win': # do windows fullscreen
self.state('zoomed') # others use geometry()
self.saveimage = imgpil
self.savephoto = imgtk # keep reference on me
trace((scrwide, scrhigh), imgpil.size)

def sizeToDisplaySide(self, scaler):

resize to fill one side of the display

imgpil = self.saveimage
scrwide, scrhigh = self.maxsize() # wm screen size x,y
imgwide, imghigh = imgpil.size # img size in pixels
newwide, newhigh = scaler(scrwide, scrhigh, imgwide, imghigh)
if (newwide newhigh < imgwide imghigh):
filter = Image.ANTIALIAS # shrink: antialias
else: # grow: bicub sharper
filter = Image.BICUBIC
imgnew = imgpil.resize((newwide, newhigh), filter)
self.drawImage(imgnew)

def onSizeToDisplayHeight(self, event):
def scaleHigh(scrwide, scrhigh, imgwide, imghigh):
newhigh = scrhigh
newwide = int(scrhigh * (imgwide / imghigh)) # 3.x true div
return (newwide, newhigh) # proportional
self.sizeToDisplaySide(scaleHigh)

def onSizeToDisplayWidth(self, event):
def scaleWide(scrwide, scrhigh, imgwide, imghigh):
newwide = scrwide
newhigh = int(scrwide * (imghigh / imgwide)) # 3.x true div
return (newwide, newhigh)
self.sizeToDisplaySide(scaleWide)

def zoom(self, factor):

zoom in or out in increments

imgpil = self.saveimage
wide, high = imgpil.size
if factor < 1.0: # antialias best if shrink
filter = Image.ANTIALIAS # also nearest, bilinear
else:
filter = Image.BICUBIC
new = imgpil.resize((int(wide factor), int(high factor)), filter)
self.drawImage(new)

def onZoomIn(self, event, incr=.10):
self.zoom(1.0 + incr)

def onZoomOut(self, event, decr=.10):
self.zoom(1.0 - decr)

def onSaveImage(self, event):

save current image state to file

filename = saveDialog.show()

PyPhoto: An Image Viewer and Resizer | 725