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Languages & Coding => Blitz Code Archives => Algorithms => Topic started by: BlitzBot on June 29, 2017, 12:28:43 AM

Title: [bb] RND substitute by jfk EO-11110 [ 1+ years ago ]
Post by: BlitzBot on June 29, 2017, 12:28:43 AM

Title : RND substitute
Author : jfk EO-11110
Posted : 1+ years ago

Description : This is pretty useless, however if you will ever need a function that does RND without to use Blitz's built in Rnd() function then this may be useful.

Note: the sequences are NOT reproducable, so whenever you run it the numbers will differ.

No smart maths here, just a simple overflow usage.

Code :

Code: BlitzBasic

1. Graphics 640,480,32,2
2. SetBuffer FrontBuffer()
3.  
4. Global rnd_inc
5.  
6.  
7. Repeat
8.  Plot  my_RND#(100,540), my_RND#(100,380)
9. Until KeyDown(1)
10.  
11. End
12.  
13.  
14.  
15.  
16. Function my_RND#(v1#,v2#)
17.  rnd_inc=(rnd_inc)+(ScanLine()*MilliSecs()) Mod 3500000000
18.  rnd_st$=Abs(rnd_inc)
19.  rnd_st$=Right$("000000"+Abs(rnd_inc),6)
20.  rnd_st$="0."+rnd_st$
21.  n#=v1+(Float(rnd_st$)*(v2-v1))
22.  Return n
23. End Function

Comments :


_33(Posted 1+ years ago)

 Do you know how SLOW it is to convert a numeric to a string, then use Right$, concatenate the string with something else, convert it back to numeric.... ????


Azathoth(Posted 1+ years ago)

 You're overwriting 'rnd_st$' :rnd_st$=Abs(rnd_inc)rnd_st$=Right$("000000"+Abs(rnd_inc),6)