Short Intro Challenge Keftales.

[Shockwave]

I had a line to spare so I added windowed mode so I could display the credits in the title bar :p

This effect is using the classic Keftales formula, I've added some attractive copper stlye colours, animated the colours, moved them around and done a real time zoom on it too.

Hope you like it

Code: [Select]

#DEFINE PTC_WIN
 #Include Once "tinyptc.bi"
 If( ptc_open( "DBF ZOOMING AND MOVING KEFTALES BY SHOCKWAVE^DBF *IN 20 LINES* ESC EXIT", 640, 480 ) = 0 ) Then End
 dim shared buffer(640*480) as integer
 dim shared as double zf
 dim shared as integer mvx,mvy,gadd,gadd2,x,y
 do             
    gadd=gadd+3
    gadd2=gadd2+20
    zf=.011+(.01*sin(gadd/191))
    mvx=499*sin(gadd/153)
    mvy=499*cos(gadd/131)
    for y=0 to 479       
    for x=0 to 640
        pwr=120+119*sin((((x+mvx)*(y+mvy))+gadd2) * zf)         
        buffer(x+(y*640))=rgb(pwr,pwr*y shr 9, pwr * y *culp)
    next
    next
 ptc_update@buffer(0)
 loop until inkey$<>""


[Tetra]

  Nice going you managed to cram a lot of stuff into that one, particularly like the range of colors on the screen

[Shockwave]

It's really cool what can be done in 20 lines

[Rbz]

Really cool   

[Optimus]

Heh,. keftales
I like very much the colors.

[Shockwave]

Cheers Optimus

[benny!]

...

Code: [Select]

...
        buffer(x+(y*640))=rgb(pwr,pwr*y shr 9, pwr * y *culp)
...


Sorry for bringing this topic up, but I currently try to fork code to add some more examples to TinyC5. Since I do not know Freebasic, what is the meaning of the culp multiplier ?

[neriakX]

unbelievable ... 20 lines. it's looking very nice! k++ for the source

[Shockwave]

Sorry Benny, it's old code!
That variable doesn't seem to do anything.. I've just forgotten to take it out

[combatking0]

That variable doesn't seem to do anything.. I've just forgotten to take it out

I do that all the time - often I'll build something on top of an older program, which itself was recycled, and before I know it I've got lines from a program I made 5 years ago lurking in new code

[benny!]

Sorry Benny, it's old code!
That variable doesn't seem to do anything.. I've just forgotten to take it out

Alright, no worries. I just wanted to convert the code to javascript and don't wanted to make a mistake. Hope you don't mind if I use that code (credits are of course give to you).

[Raizor]

What is a keftale anyway? I googled and just found an old Kefren's demo

[relsoft]

What is a keftale anyway? I googled and just found an old Kefren's demo

This.