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Dark GDK / Trouble with Random Numbers

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EagleEye626
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Posted: 9th Sep 2009 03:25
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Hi guys. Working on a C++ program in this class I'm taking. I'm having trouble with random numbers. I'm trying to get a circle drawn on the midpoint of a line. I think the problem is that my calculations aren't right because of the dbRND functions. How do you generate a random number between, say, 250 to 450?
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Lilith
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Posted: 9th Sep 2009 05:43 Edited at: 9th Sep 2009 05:43
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dbRND returns a number between 0 and the number specified. If you want a range with a higher minimum, as in your example, determine the difference between the minimum and maximum and find a random value between 0 and that difference. Then add the minimum.

In your example, 450 - 250 = 200.

return 250 + dbRND (200);

I won't argue if dbRND is inclusive of zero or the expected maximum. A bit of experimentation should show if you need to increase the range by one or shift something down to get a zero base.

Lilith, Night Butterfly
I'm not a programmer but I play one in the office
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EagleEye626
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Posted: 9th Sep 2009 06:12
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That didn't work...what you said to do makes sense, but the circle keeps appearing in random places and not where it's supposed to.
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EagleEye626
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Posted: 9th Sep 2009 06:15
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Didn't work....it makes sense though, but the circle is still appearing in random places
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Lilith
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Posted: 9th Sep 2009 07:23
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Quote: "That didn't work...what you said to do makes sense, but the circle keeps appearing in random places and not where it's supposed to.
"


Where is it supposed to? Random numbers shouldn't supposed to be in a supposed position.

Lilith, Night Butterfly
I'm not a programmer but I play one in the office
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EagleEye626
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Posted: 9th Sep 2009 14:49
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The line's endpoints are supposed to be random, and the circle is supposed to be on the midpoint of the line every time they are drawn.
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puppyofkosh
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Posted: 9th Sep 2009 23:15
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This should do it, but it doesn't use the darkGDK random functions

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zapakitul
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Posted: 10th Sep 2009 01:11 Edited at: 10th Sep 2009 01:11
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This is what I use to generate random numbers:
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