On 10/20/2015 3:05 PM, Randy Day wrote:
I'm writing a simple image manipulation
on a PhotoImage (tkinter), and running
into an odd problem. The code below works,
except for one thing:
As the image is scanned, I'd like to
observe the pixels getting inverted on
the image (as a kind of progress bar).
What happens is that the code runs the
complete loop before refreshing the
photo.
I have no idea why, but here are some ideas I'd try out.
So is it refreshing upon completion of the loop, or upon exit from
process()?
What happens if you put an outer loop around yours to process hght in
ten (pick a number) steps?
Emile
I've tried various forms of
refresh(), update(), etc., within the
loop, but so far no luck. Am I
missing something simple?
def process(): # Ordinarily this would be process(photo,wdth,hgt)
global wdth # but I ran into problems calling it from a button
global hgt #command with parameters...
global photo # the PhotoImage displayed by the calling code
# indents set to 1 to avoid word wrap
# Loop through rows and columns of the image
v=wdth
z=0
a=-1
for y in range (0,hgt):
w=v
v=z # swap v and z so rows are scanned l/r r/l l/r
z=w
a=-a # set our inc/dec step for lr->rl scan
for x in range(v,z,a):
pix = photo.get(x,y) if pix == u'0 0 0' :
#pixel_turn_on()
photo.put("#%02x%02x%02x" % (255,255,255), (x,y))
else:
#pixel_turn_off()
photo.put("#%02x%02x%02x" % (0,0,0), (x,y))
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