simple vectorstars

[xp^tsa]

eine möglichkeit  "vectorstars" zu basteln (unoptimiert)

1-bitplane screen, rotiert 3 achsen, sin/cos vorberechnet, ausführbar mit aktueller amiblitzversion

Code:

Statement xCls{a.l}
 MOVE.l d0,a0 : ADD.l #40*256,a0
 MOVEQ #0,d0 : MOVEQ #0,d1 : MOVEQ #0,d2  : MOVEQ #0,d3  : MOVEQ #0,d4
 MOVEQ #0,d5 : MOVEQ #0,d6 : MOVE.l d0,a1 : MOVE.l d0,a2 : MOVE.l d0,a3
 MOVE #255,d7
 loop1:MOVEM.l d0-d6/a1-a3,-(a0):DBRA d7,loop1
 AsmExit
End Statement

BitMap 0,320,256,1
BitMap 1,320,256,1

AGAPalRGB 0,0,32,22,33
AGAPalRGB 0,1,200,200,200

NEWTYPE.ball
x.q
y
z
nx
ny
End NEWTYPE

Dim List balls.ball(50)

While AddLast(balls())
 balls()\x=Rnd(40)-20
 balls()\y=Rnd(40)-20
 balls()\z=Rnd(40)-20
Wend

distance.w = 20


Dim Costable(360)
Dim Sintable(360)

For i=0 To 359
Costable(i)=Int( Cos(i*0.017453) *1024 )
Sintable(i)=Int( Sin(i*0.017453) *1024 )
Next

BLITZ
InitCopList 0,44,256,$10001,8,2,0

Mouse On
CreateDisplay 0
DisplayBitMap 0,0:DisplayPalette 0,0
Use BitMap db

While Joyb(0)=0
 VWait
 DisplayBitMap 0,db
 db=1-db
 Use BitMap db

 xCls{Peek.l (Addr BitMap(db)+8)}

vx + 2; X rotation speed
vy + 1; Y rotation speed
vz + 1; Z rotation speed

If vx>359:vx=1:EndIf
If vy>359:vy=1:EndIf
If vz>359:vz=1:EndIf

distance=10+MouseY

 cosx=Costable(vx)
 cosy=Costable(vy)
 cosz=Costable(vz)
 sinx=Sintable(vx)
 siny=Sintable(vy)
 sinz=Sintable(vz)

ResetList balls()
While NextItem(balls())

;simply move stars
 balls()\x+1
 If balls()\x>20 Then balls()\x=-20

;"3d-engine" ^^
 ty = ((balls()\y * cosx) - (balls()\z * sinx))/1024
 tz = ((balls()\y * sinx) + (balls()\z * cosx))/1024
 tx = ((balls()\x * cosy) - (tz * siny))/1024
 tz = ((balls()\x * siny) + (tz * cosy))/1024

 balls()\nx  = ( 200 * tx) / (distance - tz )  + 160
 balls()\ny  = ( 200 * ty) / (distance - tz)   + 127

 nodraw=0
 If balls()\nx > 319 : nodraw=1 : EndIf
 If balls()\ny > 255 : nodraw=1 : EndIf
 If balls()\nx < 1   : nodraw=1 : EndIf
 If balls()\ny < 1   : nodraw=1 : EndIf
 
 If nodraw=0
 Plot balls()\nx,balls()\ny,1
 EndIf  

 Wend
Wend

End