Computer Science Canada

pic ids
Author:  Andy [ Sun Jan 11, 2004 9:06 pm ]
Post subject:  pic ids
ok i know how to take a snap shot on the screen but what i want to know is i you save two pictures using Pic.Save can you compare them to see if they're the same picture?
Author:  Cervantes [ Sun Jan 11, 2004 9:53 pm ]
Post subject: 
compare them in Turing or in Windows?

I haven't used Pic.Save before.. the only way I can think to compare them is to compare their file sizes. I know that doesn't mean they're the same, but its the best I can do Neutral
Author:  McKenzie [ Sun Jan 11, 2004 10:05 pm ]
Post subject: 
You have to use this interesting function called whatdotcolour, maybe you've heard of it
code:

var same :=true
Pic.Draw(firstpic,somex,somey,picXor)
Pic.Draw(secondpic,somex,somey,picXor)
for x:somex .. somex + picWidth -1
    for y:somey .. somey + picHeight -1
        if whatdotcolour(x,y) > 0 then
            same := false
        end if
    end for
end for
Author:  Cervantes [ Sun Jan 11, 2004 10:10 pm ]
Post subject: 
whatdotcolour? never heard of it! Thinking
but the whatdotcolour > 0 part confuses me.... so your just checking the outline..?
Author:  McKenzie [ Sun Jan 11, 2004 10:10 pm ]
Post subject: 
but seriously you can just open them up as binary files read one character at a time from each and compare them this way.
Author:  McKenzie [ Sun Jan 11, 2004 10:16 pm ]
Post subject: 
it'll work, but it was a joke. Dodge loves whatdotcolour, and I recently wrote a tutorial on the almost useless ability to draw pics using picXor. I figured why not combine them? whatdotcolour is actually quite usefull. What it does is return the colour value of a pixel on the screen. In this case if both pics are the same the XOR will cause the to blank out. So I check the entire area to see if its all white.
Author:  Cervantes [ Sun Jan 11, 2004 10:23 pm ]
Post subject: 
yeah I kinda noticed his love for whatdotcolor lol. I love it too Very Happy (btw what I said about never heard of it was a joke too)
Author:  McKenzie [ Sun Jan 11, 2004 10:26 pm ]
Post subject: 
oops, should have figured that when you asked about the outline Embarassed
Author:  Cervantes [ Sun Jan 11, 2004 10:28 pm ]
Post subject: 
indeed. Razz

dodge what do you need this for?? are you just playing around or are you making some elaborate program (that I'm assuming would use whatdotcolor exclusively Razz)

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