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Dark GDK / Random number problem

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Skolmen
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Posted: 6th Nov 2009 22:45
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Hello!

I'm currently working on a game where I want a sprite to move with a random velocity between -3 and 3. Anyhow I don't know how to make a random number that can be lower than zero. The second problem is that when I do get a rondom number (between zero and three) the velocity keeps changing all the time, and the sprite is "lagging".

Would really apreciate some answeres

C++ newbie.
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american eagle
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Posted: 7th Nov 2009 01:49
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first of all doing random number below 0 can be done simply like this:


your other problem you have to post snap of your code so i can tell what's the problem
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cleonjones
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Posted: 7th Nov 2009 02:32
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I'm guessing you're assigning the random velocity inside the LoopGDK() section of your code, you should set it outside and before that loop. If you want it set when something specific happens, I would use some if statements or a function of your own

?
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Skolmen
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Posted: 7th Nov 2009 19:20
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Well, assigning the velocity outside of the loop made the lagging go away. However, the dbRND(6)-3 seems to generate the same number every time, and the number generated is 3. Anyone know how to solve this?

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prasoc
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Posted: 7th Nov 2009 19:41
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"int i;
i=dbRND(6)-3;
" will not go below zero



Are you using dbRandomize() every loop? if so, DON'T!


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american eagle
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Posted: 7th Nov 2009 20:36
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prasoc my friend u r wrong it should be dbRND(6)-3
the dbRND gives values from 0 to 6 and to make it go from -3 to 3 u shoud put -3 ur way will give numbers from -6 to - 3
though ur right about dbRandomize(dbTimer()) it should be just one time not in the loop
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prasoc
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Posted: 7th Nov 2009 20:39
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oh my bad. I don't even know what I was thinking of then lol


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