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Author Topic: Snow Demo  (Read 8947 times)

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Offline JWinslow23

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Re: Snow Demo
« Reply #15 on: January 26, 2014, 12:19:59 pm »
Sometimes, with your version, snowflakes appear to merge with other snowflakes. And it usually ends before the entire screen is filled. Just saying.
« Last Edit: January 26, 2014, 12:22:59 pm by JWinslow23 »
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Offline Xeda112358

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Re: Snow Demo
« Reply #16 on: January 26, 2014, 12:27:00 pm »
Uh, yup, I forgot to add one line:
Code: [Select]
Ans→L2(Ans
This should be inserted before (or after, doesn't really matter) the line redrawing the new location of the snowflake.
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Offline JWinslow23

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Re: Snow Demo
« Reply #17 on: January 26, 2014, 12:34:10 pm »
Works, except for one thing...

When there is only one opening in the top spot, it freezes. I recommend you just generate a snowflake position, and if a snowflake isn't there already, then and only then can you add it as a snowflake.
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Offline Xeda112358

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Re: Snow Demo
« Reply #18 on: January 26, 2014, 12:39:05 pm »
It shouldn't freeze... I mean, theoretically, with a perfect random number generator it can, but the probability that it hasn't found an opening after n iterations is (15/16)n.

It has always worked pretty quickly for me at finding the opening. Also, my program exits when the screen is full (or clear is pressed).
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Offline JWinslow23

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Re: Snow Demo
« Reply #19 on: January 26, 2014, 12:48:45 pm »
Let me explain it to you in the least complicated way I can...

The RNG makes a snowflake in two unfilled positions at the top.
Near the end, these positions become filled.
When there is only one unfilled position, it finds that position, makes a snowflake there, then checks for another unfilled position.
The problem is, there is no unfilled position.
So it keeps generating forever.
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Offline Xeda112358

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Re: Snow Demo
« Reply #20 on: January 26, 2014, 12:53:52 pm »
It generates 2 each cycle by default.
There are 128 positions.
This will never happen :P

And in case you wanted to do a number that doesn't evenly divide into 128, this piece of the code allows exiting as soon as 128 flakes are on screen:
Code: [Select]
E+1→E
If E=128
S→B
That exits the For() loop to prevent generating any more snow flakes, then if you look at the main Repeat loop conditions:
Code: [Select]
Repeat E>=128 or getKey=45
This exits if [Clear] is pressed or E is 128 or larger. E counts how many flakes have been drawn.
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Offline JWinslow23

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Re: Snow Demo
« Reply #21 on: January 26, 2014, 12:57:32 pm »
Really? Cause it has. :P

Try setting 100 as rand before starting the program. You'll see what I mean.

« Last Edit: January 26, 2014, 01:11:50 pm by JWinslow23 »
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Offline Xeda112358

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Re: Snow Demo
« Reply #22 on: January 26, 2014, 01:09:15 pm »
That appears to be a bug with collision detection. Feel free to try to figure it out :P
Theoretically, the top spots should only be full if all the rest below are full.
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Offline JWinslow23

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Re: Snow Demo
« Reply #23 on: January 26, 2014, 01:12:41 pm »
And they are. :P

Really, the demo "fills" a top spot every iteration. Then, on the next iteration, it falls down.

If you wanna know how to fix it, I know.
« Last Edit: January 26, 2014, 01:14:41 pm by JWinslow23 »
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Offline Xeda112358

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Re: Snow Demo
« Reply #24 on: January 26, 2014, 01:39:59 pm »
[discussion in IRC]
[time passes]
Here is my program, it just does one at a time for competition and it spits out a new flake at each iteration with probability 1/2.
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Offline JWinslow23

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Re: Snow Demo
« Reply #25 on: January 26, 2014, 01:40:55 pm »
OK, it's settled.

Xeda and I are going to have a competition.

The rules:
We must modify our codes to be almost similar, except for mine using lists and hers using matrices. (i.e. either I generate my snowflakes one after another, or she generates hers at random times)
We must each test 3 values of rand: 0, 10, and 100.
We shall make another program in this format and run it:
Code: [Select]
startTmr -> Z
prgmOURSNOW
Disp checkTmr(ZWhoever has a lower value for most of them is the winner.
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Offline Xeda112358

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Re: Snow Demo
« Reply #26 on: January 26, 2014, 01:43:46 pm »
Do you generate a new snowflake with probability .5 ?
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Offline JWinslow23

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Re: Snow Demo
« Reply #27 on: January 26, 2014, 01:47:44 pm »
int(2rand has a .5 probability of being 1 or 0, right? So yeah.
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Offline Xeda112358

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Re: Snow Demo
« Reply #28 on: January 26, 2014, 01:51:01 pm »
Yep, that is what I am using. By the way, I am just running through the program 3 times and timing it with the given rand seeds. (I am doing it all in one program, though)
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Offline JWinslow23

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Re: Snow Demo
« Reply #29 on: January 26, 2014, 01:55:51 pm »
So am I.

Here's what I got.

rand
0
50
100
Josiah
201
201
191
Xeda
477
334
353

I dunno, it's really at the mercy of the generator. And how many times you use it.
« Last Edit: January 26, 2014, 01:56:27 pm by JWinslow23 »
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