; Big Map demo  (Blitz Basic 1.36)
; By Tom Stevenson (wargamer)
; 1/23/2001
; This program demonstrates how a large map can be created/updated from many image screens
; It would be simpler just to create one giant image to update the screen from
; but many video cards can't handle this.  (Direct X limitation)

;screen constants, map size constants
Const ScrnW=800, ScrnH=600 ,Xscrns=3, Yscrns=3, nScreens=Xscrns*Yscrns
;Upper left coordinates of map section on screen
Global mapX, mapY						
;maxim values for MapX and MapY
Global MaxMapX = ScrnW * (Xscrns-1)+100    	;(hardwire 50 pixel margins)
Global MaxMapY = ScrnH * (Yscrns-1)+100    	;(hardwire 50 pixel margins)
;hexagon dimensions
Global cellsizeX=44, cellsizeY=50, aHex=7   
;structure for holding screen information
Type ScreenInfo
  Field hand,x,y
End Type

;Initiate map screens  
Graphics ScrnW,ScrnH
Dim scrn.ScreenInfo (nScreens)
For x=0 To XScrns-1
  For y=0 To YScrns-1
	i=i+1
	scrn.ScreenInfo (i) =New ScreenInfo
	scrn(i)\x= x * ScrnW   ;X offset of screen relative to map origin 0,0
	scrn(i)\y= y * ScrnH   ;Y offset of screen relative to map origin 0,0
	scrn(i)\hand=CreateImage(scrnW, scrnH)  ;create a blank screen
  	drawscreen(scrn(i))                     ;fill the screens once
  Next 
Next 
 
;draw initial screen
SetBuffer BackBuffer()
Cls
Mapdraw()

;main control loop
Repeat
	If KeyDown(1) Then done=True			;esc
	If KeyDown(203) Then mapX=mapX-10    	;left arrow
	If KeyDown(205) Then mapX=mapX+10    	;right arrow
 	If KeyDown(200) Then mapY=mapY-10    	;up arrow
	If KeyDown(208) Then mapY=mapY+10    	;down arrow
	If KeyDown(201) Then mapY=mapY-100   	;page up
	If KeyDown(209) Then mapY=mapY+100   	;page down
	If KeyDown(199) Then mapY=0:mapX=0   	;home
	If KeyDown(207) Then 					;end
	  mapY=MaxMapY:      mapX=MaxMapX  
	EndIf

	;make sure map coordinates or in bounds	
	If MapX<0 Then MapX=0
	If MapY<0 Then MapY=0
	If MapX>MaxMapX Then MapX=MaxMapX
	If MapY>MaxMapY Then MapY=MaxMapY
	If MapX<>MapX2 Or MapY<>MapY2
		;redraw map only if necessary
		MapX2 = MapX
		MapY2 = MapY
		Mapdraw()
	EndIf
Until done
WaitKey
End


Function drawScreen(map.ScreenInfo)
	;creates initial screens
	If map\hand=0 Then 
	  Stop
	  End
	Else
	  drawbuf=ImageBuffer (map\hand)
	EndIf
	SetBuffer drawbuf
	
	Viewport 0,0,ScrnW,ScrnH
	Cls
;here is the key
	Origin -map\x,-map\y

	;draw some stuff that extends across screens
	Color 255,0,0
	Rect 600,400,400,400
	Rect 0,0,800,200
	Color 0,250,0
	Oval 800,600,400,300
	Rect 800,200,800,200
	Color 0,255,255
	Rect 600,1000,1000,200
	Color 255,255,0
	;draw a small square in the bottom right corner 
	Rect ScrnW * (Xscrns)-20, ScrnH * (Yscrns)-20,20,20
	Rect 0,0,20,20
		
	;draw hexes
	Origin 0,0
	Color 255,255,255
	Xoff=map\X Mod cellsizeX
	Yoff=map\Y Mod cellsizeY
	For my = 0 To 12
      For mx = -1 To 17
		hX1 = mX * cellsizeX -Xoff
    	hy1 = mY * cellsizeY - ((mX+1) Mod 2) * cellsizeY / 2 -Yoff
        For side = 1 To 3
  			hx2 = hx1 + cellsizeX
  			Select  side
  			Case 1
    			rx1 = hx1 + aHex
    			rx2 = hx2 - aHex
    			ry1 = hy1
    			ry2 = hy1
			Case 2
			    rx1 = hx2 - aHex
			    rx2 = hx2 + aHex
			    ry1 = hy1
			    ry2 = hy1 + cellsizeY / 2
		  	Case 3
				rx1 = hx2 + aHex
			    rx2 = hx2 - aHex
			    ry1 = hy1 + cellsizeY / 2
			    ry2 = hy1 + cellsizeY
			End Select
	    	Line rx1, ry1, rx2, ry2
	    Next 
	  Next
	Next 
	SetBuffer BackBuffer()
End Function


Function Mapdraw()
	SetBuffer BackBuffer()
	Cls
	m=50   ;margin
	Viewport m,m,ScrnW-m-m, ScrnH-m-m
	;This is key
	Origin m-MapX,m-MapY
	;copy image blocks to back buffer
	For i=1 To nScreens
	  DrawBlockRect scrn(i)\hand, scrn(i)\X, scrn(i)\Y, 0, 0, scrnW,ScrnH
	Next 
	Viewport 0,0,ScrnW,ScrnH
	Origin 0,0
	Text 20,20,"Map Coordinates: "+Str$(mapX) +" " + Str$(mapY)
	Text ScrnW-160,20, "Esc Key = Quit"
	Text 20,ScrnH-20,"Use Up, Down, PageUp, PageDown, Home, and End keys to scroll"
	Flip ;swap front and back buffers
End Function

While Not KeyDown(1)
Wend
End<!--'"</title></head>-->

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