you're a little cell lost in a petri dish, become the biggest cell by absorbing smaller cells!
The trick is finding which one you are before you get absorbed! The player is the cell on the right in the png image.
Arrow keys to move around: note you loose mass as you do
R to reset
Esc to quit
Image download link
https://www.dropbox.com/s/3gbeo8ionh7fktd/osmosis.png
Code: Select all
;*****************************************************************************
;* July-August 2014 PurePunch contest
;* PureBasic 5.22
;* 50 lines of 80 chars, 2 months delay
;* Name : Osmosis
;* Author : idle
;* Date : 4/7/2014
;* Notes :Your a tiny cell lost in a petri dish full of predators. The trick is finding where you are before you loose!
;* :Arrow keys move you round, escape ends , R resets
;*****************************************************************************
Structure ball:x.d:vx.d:y.d:vy.d:r.d:m.d:sprite.i:EndStructure:Global ri,bo
Global NewList bb.ball():Global Dim sp(12):Global *player.ball,st,time
Procedure CircleToCircle(*b.ball,*b1.ball):dx.d=*b\x-*b1\x:dy.d=*b\y-*b1\y
dist.d=Sqr(dx*dx+dy*dy):t.d=*b\r+*b1\r:If dist<t:fd.d=(dist-t)/dist:m0.d=*b\m
m1.d=*b1\m:x0.d=*b\x-*b\vx:x1.d=*b1\x-*b1\vx:y0.d=*b\y-*b\vy:y1.d=*b1\y-*b1\vy
dx=*b\x-*b1\x:dy=*b\y-*b1\y:nx.d=dx/t:ny.d=dy/t
p.d=(2*(x0*nx+y0*ny)-(x1*nx+y1*ny))/(m0+m1)*(1/(2*#PI)):dx=x0-(p*m1*nx)
dy=y0-(p*m1*ny):*b\vx=*b\x-dx:*b\vy=*b\y-dy:dx=x1+(p*m0*nx):dy=y1+(p*m0*ny)
*b1\vx=*b1\x-dx:*b1\vy=*b1\y-dy:ProcedureReturn 1:EndIf:EndProcedure
Procedure up():Protected dx.d,dy.d:ForEach bb():dx=(bb()\x-bb()\vx)
dy=(bb()\y-bb()\vy):bb()\vx=bb()\x:bb()\vy=bb()\y:bb()\x+dx:bb()\y+dy
If bb()\x-bb()\r<0:bb()\vx=0+bb()\r:bb()\x=bb()\vx:bb()\x-dx
ElseIf bb()\x+bb()\r>ri:bb()\vx=ri-bb()\r:bb()\x=bb()\vx:bb()\x-dx:EndIf
If bb()\y-bb()\r<=0:bb()\vy=0+bb()\r:bb()\y=bb()\vy:bb()\y-dy
ElseIf bb()\y+bb()\r>=bo:bb()\vy=bo-bb()\r:bb()\y=bb()\vy:bb()\y-dy:EndIf:Next
EndProcedure:Procedure Reset():ClearList(bb()):For a=1 To 100:AddElement(bb())
If a=1:r=18:*player=@bb():Else:r=Random(20,3):EndIf:vx.d=(-1+Random(2))*0.5
vy.d=(-1+Random(2))*0.5 : bb()\x=Random(ri-r,r):bb()\y=Random(bo-r,r)
bb()\vx=bb()\x+vx:bb()\vy=bb()\y+vy:bb()\r=r:bb()\m=#PI*r*r:s=Random(1,0)
If a=1:s=3:EndIf:bb()\sprite=sp(s):Next:st=ElapsedMilliseconds():time=0
EndProcedure:Procedure RunWorld():Protected*bt.ball,ft.d,su.d,ag.d
Repeat:Repeat:EV=WindowEvent():If EV=#PB_Event_CloseWindow:End:EndIf:ag+0.03
Until EV=0:FirstElement(bb()):ExamineKeyboard():If KeyboardPushed(#PB_Key_Up)
bb()\y-0.01:bb()\m-1:ElseIf KeyboardPushed(#PB_Key_Down):bb()\y+0.01
bb()\m-1:EndIf:If KeyboardPushed(#PB_Key_Left):bb()\x-0.01:bb()\m-1
ElseIf KeyboardPushed(#PB_Key_Right):bb()\x+0.01:bb()\m-1
ElseIf KeyboardInkey()="r":Reset():EndIf:For a=1 To 5:up():ForEach bb()
*bt=@bb():While NextElement(bb()):r= CircleToCircle(@bb(),*bt):If r
If bb()\r>=*bt\r
bb()\m+2:*bt\m-2:Else:*bt\m+2:bb()\m-2:EndIf:bb()\r=Sqr(bb()\m/#PI)
*bt\r=Sqr(*bt\m/#PI):EndIf:Wend:ChangeCurrentElement(bb(),*bt):Next:Next
ClearScreen(0):SpriteQuality(#PB_Sprite_BilinearFiltering)
ZoomSprite(sp(12),ri*2,ri*2):RotateSprite(sp(12),ag,0)
DisplayTransparentSprite(sp(12),0-ri/2,0-ri/2):su=-*player\m:ForEach bb()
r=bb()\r:If bb()\m>0:su+bb()\m:ZoomSprite(bb()\sprite,bb()\r*2,bb()\r*2)
RotateSprite(sp(2),bb()\x-bb()\vx,1):ZoomSprite(sp(2),bb()\r*1.8,bb()\r*1.8)
rt=bb()\r*0.9:DisplayTransparentSprite(sp(2),bb()\x-rt,bb()\y-rt,127)
DisplayTransparentSprite(bb()\sprite,bb()\x-bb()\r,bb()\y-bb()\r,127)
Else: If *player=@bb():If Not time:time=(ElapsedMilliseconds()-st)/1000
MessageRequester("osmosis","You got absorbed IN "+Str(time)+" seconds")
EndIf:Else:DeleteElement(bb()):EndIf:EndIf:Next:If *player\m>su:If Not time
time=(ElapsedMilliseconds()-st)/1000
MessageRequester("osmosis","You became the largest In "+Str(time)+" seconds")
EndIf:EndIf:FlipBuffers():Until KeyboardPushed(#PB_Key_Escape):EndProcedure
InitSprite():InitKeyboard():UsePNGImageDecoder():ri=1000:bo=600
OpenWindow(0,0,0,ri,bo,"Osmosis"):OpenWindowedScreen(WindowID(0),0,0,ri,bo)
For a=0 To 3:sp(a)=LoadSprite(-1,"osmosis.png",8)
ClipSprite(sp(a),a*128,0,128,128):Next
sp(12)=LoadSprite(-1,"osmosis.png")
ClipSprite(sp(12),0,128,512,384):reset():RunWorld()
