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' Particle Pinch
'
' Copyright 2005 Ian Cowburn
'
' $Id$
'
Strict
Import noddybox.vector
Import noddybox.bitmapfont

Const MASSSIZE:Int=8
Const MASSRAD:Int=4

Type GameGFX
	Global font:TBitmapFont
	Global smallfont:TBitmapFont
	Global star:TImage
	Global mass:TImage
	Global collector:TImage
	Global point:TImage
	Global particle:Timage
	Global pointer:TImage
	
	Global play_button:TImage
	Global edit_button:TImage
	Global load_button:TImage
	Global toy_button:TImage
	Global quit_button:TImage
	Global left_button:TImage
	Global right_button:TImage
	Global scores_button:TImage
End Type

Type TMass
	Field x:Double
	Field y:Double
	Field v:TVector
	Field mass:Double
	Field friend:Int
	Field inverse:Int
	Field img:TImage
	Field swallow:Int
	
	Method New()
		v=TVector.Create()
		x=Rnd(0,GraphicsWidth())
		y=Rnd(0,GraphicsWidth())
		mass=25
		friend=True
		inverse=False
		swallow=0
	End Method
	
	Method Attract(o:TMass)
		If o=Self
			Return
		EndIf
		
		Local d:TVector=TVector.Create(o.x-x,o.y-y)
		Local l:Double=d.Length()
		
		If l>0.1
			l:*l
			d.Normalise()
			d.Scale((1/l)*o.mass)
			
			If o.inverse
				d.Minus()
			EndIf
			
			v.Add(d)
			
			If d.Length()>MASSSIZE
				d.SetLength(MASSSIZE)
			EndIf
		EndIf
	End Method
	
	Method Move()
		x:+v.x
		y:+v.y
	End Method

	Method Draw()
		SetColor(255,255,255)
		DrawImage(img,x,y,swallow)
		swallow=0
	End Method
End Type


Type TPoint
	Global img:TImage
	
	Field x:Double
	Field y:Double
	Field lx:Double
	Field ly:Double
	Field v:TVector
	Field r:Int
	Field g:Int
	Field b:Int
	Field dead:Int
	Field lost:Int
	
	Method New()
		v=TVector.Create()
		x=Rnd(0,GraphicsWidth())
		y=Rnd(0,GraphicsWidth())
		lx=x
		ly=y
		r=Rand(100,200)
		g=Rand(100,200)
		b=Rand(100,200)
		dead=False
		lost=False
	End Method
	
	Method Attract:Int(o:TMass)
		If dead Or lost
			Return
		EndIf
		
		Local d:TVector=TVector.Create(o.x-x,o.y-y)
		Local l:Double=d.Length()
		
		If l<MASSRAD
			If o.friend
				dead=True
			Else
				lost=True
			EndIf
			TParticleMachine.AddCaptured(Self)
			o.swallow=1
		Else
			l:*l
			d.Normalise()
			d.Scale((1/l)*o.mass)

			If o.inverse
				d.Minus()
			EndIf
			
			v.Add(d)
			
			If d.Length()>MASSRAD
				d.SetLength(MASSRAD)
			EndIf
		EndIf
		
		Return dead
	End Method
	
	Method Move()
		If (Not dead) And (Not lost)
			lx=x
			ly=y
			x:+v.x
			y:+v.y
			
			If x<0 Or y<0 Or x>GraphicsWidth() Or y>GraphicsHeight()
				lost=True
				TParticleMachine.AddLost(Self)
			EndIf
		EndIf
	End Method

	Method Draw()
		If (Not dead) And (Not lost)
			SetColor(r,g,b)
			DrawImage(img,x,y,0)
		EndIf
	End Method
End Type


Type TParticle
	Global img:TImage
	Field x:Double
	Field y:Double
	Field a:Double
	Field r:Int
	Field g:Int
	Field b:Int
	Field dx:Double
	Field dy:Double
	Field ai:Double
	
	Function FromLostPoint:TParticle(p:TPoint, d:Int)
		Local o:TParticle=New TParticle
		o.x=p.lx'-p.v.x*d
		o.y=p.ly'-p.v.y*d
		o.dx=-p.v.x*d
		o.dy=-p.v.y*d
		o.r=p.r
		o.g=p.g
		o.b=p.b
		o.a=1
		o.ai=-0.05
		Return o
	End Function
	
	Function FromCapturedPoint:TParticle(p:TPoint, d:Int)
		Local o:TParticle=New TParticle
		o.x=p.x
		o.y=p.y
		o.dx=Rnd(-1,1)
		o.dy=Rnd(-1,1)
		o.r=p.r
		o.g=p.g
		o.b=p.b
		o.a=1
		o.ai=-0.05
		Return o
	End Function
	
	Function FromCoord:TParticle(x:Int, y:Int)
		Local o:TParticle=New TParticle
		o.x=x
		o.y=y
		o.dx=Rnd(-2,2)
		o.dy=Rnd(-2,2)
		o.r=Rand(128,255)
		o.g=Rand(128,255)
		o.b=Rand(128,255)
		o.a=1
		o.ai=-0.01
		Return o
	End Function
	
	Method Update()
		x:+dx
		y:+dy
		a:+ai
		
		If a>0
			SetAlpha(a)
			SetColor(r,g,b)
			DrawImage(img,x,y)
		EndIf
	End Method
End Type


Type TParticleMachine
	Global list:TList
	
	Function Init()
		list=CreateList()
	End Function
	
	Function Clear()
		list.Clear()
	End Function
	
	Function AddLost(p:TPoint)
		For Local f:Int=0 To 5
			list.AddLast(TParticle.FromLostPoint(p,f))
		Next
	End Function
	
	Function AddCaptured(p:TPoint)
		For Local f:Int=0 To 5
			list.AddLast(TParticle.FromCapturedPoint(p,f))
		Next
	End Function
	
	Function AddFirework(x:Int, y:Int)
		For Local f:Int=0 To 20
			list.AddLast(TParticle.FromCoord(x,y))
		Next
	End Function
	
	Function Process()
		Local l:TLink=list.FirstLink()
		Local t:TLink
		
		While l<>Null
			Local p:TParticle=TParticle(l.Value())
			p.Update()
			
			If p.a<0.01
				t=l.NextLink()
				l.Remove()
				l=t
			Else
				l=l.NextLink()
			EndIf
		Wend
		
		SetAlpha(1)
		SetColor(255,255,255)
	End Function
End Type