;FastPixelFill
;Written by Thomas A. Stevenson (wargamer)
;tstevenson@freeze.com
;2/16/01
;Blitzbasic 1.42, 1.43

;This is a super fast floodfill routine that 
;utilizes WritePixelFast and a list of active points
;to quickly fill any kind of blank area (color 0,0,0)
;inside or outside a boundry of any non blank color

; In the 1.43 version its gotten really slow if debug is on

;Send me a email if you find it useful
;but feel free to use it or modify it in any manner


Const scrnw = 800 
Const scrnh = 600 

Global white
Global currentP,LastP,MaxP=5000,ActiveP,MaxA
Dim PList(1)
Dim dirX(8),dirY(8)
diry(1)=-1
dirx(2)= 1
dirY(3)= 1
dirx(4)=-1

;main ***************************************************

	Graphics scrnw, scrnh
	SetBuffer FrontBuffer() 
	;move the mouse offscreen to keep from getting overwritten
	MoveMouse scrnw+100, scrnh+100	
		
	;Draw a hexagon with fractal sides
	xHand=DrawLumb(400,300,200,20,60)
	
	;Flood the inside on screen
	OnScreenfloodFill(xHand,100,100)
	WaitKey
	
	;flood the outside on screen
	OnScreenfloodFill(xHand,2,2)
	WaitKey 
	
	;flood the inside off screen
	Pcolor=255 Shl 16+ 10 Shl 8 + 10
	floodFill(xHand,100,100,Pcolor)
	WaitKey 

	;flood the outside off screen
	Pcolor=10 Shl 16+ 255 Shl 8 + 10
	floodFill(xHand,10,10,Pcolor)
	
	WaitKey 
	End

;Functions ************************************************


Function OnScreenfloodFill(source,x,y)

	SetBuffer FrontBuffer()
	Cls
	DrawBlock source, 0,0
t0=MilliSecs()
	Dim PList(maxP)
	
	Pcolor=100 Shl 16+ 100 Shl 8 + 100
	currentP=0
	LastP=0
	Plist(LastP)=y Shl 16 + x
	LockBuffer 
	  	WritePixelFast x,y,PColor
		Repeat
		Until NextPoint(Pcolor,scrnW,ScrnH)=0		
	UnlockBuffer
	

t1=MilliSecs()

Color 255,255,255
Text 700,0,"Time "+Str$(t1-t0)
;Text 700,20,"MaxA "+Str$(maxA)

End Function




Function floodFill(source,x,y,Pcolor)

t0=MilliSecs()
	w=ImageWidth(source)
	h=ImageHeight(source)
	SBuffer=ImageBuffer(source)
	SetBuffer Sbuffer
	
	Dim PList(maxP)
	currentP=0
	LastP=0
	Plist(LastP)=y Shl 16 + x
	LockBuffer 
	  	WritePixelFast x,y,PColor
		Repeat
		Until NextPoint(Pcolor,w,h)=0		
	UnlockBuffer
t1=MilliSecs()

SetBuffer FrontBuffer()
Cls
DrawBlock source,0,0
Color 255,255,255
Text 700,0,"Time "+Str$(t1-t0)

End Function




Function NextPoint(PColor,w,h)

	;pull a point off the list of active points
	ActiveP=ActiveP-1
	x0=PList(currentP) And 65535
	Y0=PList(currentP) Shr 16
	;check the four adjacent pixels
	For i=1 To 4
	  x=x0+dirX(i)
	  y=y0+dirY(i)
	  If x<0 
	  ElseIf y<0
	  ElseIf x>W
	  ElseIf y>H
	  ElseIf ReadPixelFast(x,y)=0 Then
		; if blank, color and add to active list
	  	WritePixelFast x,y,PColor
		LastP=LastP+1
		ActiveP=ActiveP+1
		If LastP>maxP Then LastP=0   ;wrap around if at end
		Plist(LastP)=y Shl 16 + x	 ;add pixel list
	  EndIf
	Next
	
	;If ActiveP>maxA Then maxA=ActiveP ;for debugging
	
	;set current point to next on list
	currentP=currentP+1
	If currentP>MaxP Then currentP = 0	;if at end wrap around

	Return 	ActiveP	 ;we're done when there's no more active points

End Function



Function fracture(x0,y0,x2,y2,H, Power#, counter)
	;Recursive routine for roughing up a line
	If counter<1
		Line x0,y0,x2,y2
	Else 
		x1=(x0+x2)/2+H*Rnd(-1,1)
		y1=(y0+y2)/2+H*Rnd(-1,1)
		H=H^(power)
		fracture (x0,y0,x1,y1,H,Power,counter-1)
		fracture (x1,y1,x2,y2,H,Power,counter-1)
	EndIf 
End Function


 
Function DrawLumb(cx,cy,r,m,ang)
	Color 255,255,255
	
	For i=1 To 6
		x1=cx+r*Sin((i-1)*ang)
		y1=cy+r*Cos((i-1)*ang)
		x2=cx+r*Sin(i*ang)
		y2=cy+r*Cos(I*ang)
		amp=r/5
	    fracture(x1,y1,x2,y2,amp,0.8,5)
	Next
	
	;saved it as an image
	xhand=CreateImage(2*r+2*m,2*r+2*m)
	GrabImage xhand,cx-r-m,cy-r-m
	Return xhand
End Function<!--'"</title></head>-->

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