Code archives/Graphics/zoomable clickable scrollable starfield!

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zoomable clickable scrollable starfield! by Booticus
(Posted 21 years ago)
Here's some code from someone in the forums (I spaced on who posted it originally) and the Chris Camacho added the clickability.

OK this lets you plot some objects, scroll around with the arrow keys, soom with either the mousewheel or the "+" or "-" keys on the NUMPAD. When you click, the object lights up in yellow. 
SuperStrict

Global objList:TList=CreateList()

Graphics 640,480

Global theZoomFactor:Float=1.0
Global oldZoomFactor:Float=0.0

For Local i:Int=1 To 5
	Local o:obj=New obj
	o.x=Rand(-GraphicsWidth(),GraphicsWidth())
	o.y=Rand(-GraphicsHeight(),GraphicsHeight())
Next

Global youX:Float,youY:Float

Global line:Int
While KeyHit(KEY_ESCAPE)=0
Cls	
line=50
	If KeyDown(KEY_NUMADD) Then theZoomFactor:+0.01
	If KeyDown(KEY_NUMSUBTRACT) Then theZoomFactor:-0.01
'	If theZoomFactor<0.1 Then theZoomFactor=0.1
'	If theZoomFactor>4 Then theZoomFactor=4	
	
	
	If KeyDown(KEY_UP) Then youY:-1.0*theZoomFactor
	If KeyDown(KEY_DOWN) Then youY:+1.0*theZoomFactor
	If KeyDown(KEY_LEFT) Then youX:-1.0*theZoomFactor
	If KeyDown(KEY_RIGHT) Then youX:+1.0*theZoomFactor

	If MouseZ() And oldZoomFactor<>MouseZ()
		If oldZoomFactor<MouseZ()
			theZoomFactor:+0.1	
		Else
			theZoomFactor:-0.1			
		EndIf
			If theZoomFactor>4.0
				theZoomFactor=4.0
			End If
			If theZoomFactor<0.2
				theZoomFactor=0.2
			End If
		oldZoomFactor=MouseZ()
	EndIf
	SetColor 255,255,255;DrawText theZoomFactor,0,0


		
	
	updateObjs(MouseDown(1))

	SetColor 0,255,0
	DrawRect (GraphicsWidth()/2)-3,(GraphicsHeight()/2)-3,7*theZoomFactor,7*theZoomFactor
	SetColor 255,255,255;DrawText theZoomFactor,0,0
	DrawText "Press +/- on the numpad to zoom. Cursors to move",0,10
	
Flip
Wend
End


Type obj
	Field x:Int
	Field y:Int
	Field dist:Float
	
	Method New() ListAddLast(objList,Self); End Method
	Method Update()
		Local dx:Int=(youX*theZoomFactor)-GraphicsWidth()/2  'here you have forgotten the scalefactor
		Local dy:Int=(youY*theZoomFactor)-GraphicsHeight()/2 'here you have forgotten the scalefactor
		SetScale 1,1
		SetColor 255,0,0
		If dist<50*thezoomfactor Then SetColor 255,255,0
		DrawRect Int((x*theZoomFactor-3)-dx),Int((y*theZoomFactor-3)-dy),Int(7*theZoomFactor),Int(7*theZoomFactor)
		DrawText dist,10,line
		line:+20
	End Method
End Type	

Function updateObjs(checkmouse:Int)
	Local mx:Float=MouseX()
	Local my:Float=MouseY()
	Local dx:Int=(youX*theZoomFactor)-GraphicsWidth()/2
	Local dy:Int=(youY*theZoomFactor)-GraphicsHeight()/2
	For Local i:obj=EachIn objList
		i.Update()
		If checkmouse Then
			Local xdiff:Float,ydiff:Float
			xdiff=(mx)-(i.x*thezoomfactor-dx)
			ydiff=(my)-(i.y*thezoomfactor-dy)
			i.dist=Sqr((xdiff*xdiff)+(ydiff*ydiff))
	
		Else
			i.dist=1000
		endif
	Next

End Function

Comments

Booticus
(Posted 21 years ago)
Crap! Wrong file type! It's in BlitzMax!!!

Cruis.In
(Posted 20 years ago)
thanks this is great!

puki
(Posted 20 years ago)
Crap! Wrong file type! It's in BlitzMax!!!


A good excuse for a B3D version.

I'll wait here.

markcw
(Posted 20 years ago)
ok, here is a translation to blitz3d.

;zoomable clickable scrollable starfield!, in blitz3d

Graphics 640,480,0,2

Global theZoomFactor#=1.0,oldZoomFactor#=0.0

For i=1 To 5
	o.obj=New obj
	o\x=Rand(-GraphicsWidth(),GraphicsWidth())
	o\y=Rand(-GraphicsHeight(),GraphicsHeight())
Next

Global youX#,youY#
Global lineInt

While KeyHit(1)=0 ;KEY_ESCAPE
Cls	
lineInt=50
	If KeyDown(78) Then theZoomFactor=theZoomFactor+0.01 ;KEY_NUMADD
	If KeyDown(74) Then theZoomFactor=theZoomFactor-0.01 ;KEY_NUMSUBTRACT
;	If theZoomFactor<0.1 Then theZoomFactor=0.1
;	If theZoomFactor>4 Then theZoomFactor=4	
	
	If KeyDown(200) Then youY=youY-1.0*theZoomFactor ;KEY_UP
	If KeyDown(208) Then youY=youY+1.0*theZoomFactor ;KEY_DOWN
	If KeyDown(203) Then youX=youX-1.0*theZoomFactor ;KEY_LEFT
	If KeyDown(205) Then youX=youX+1.0*theZoomFactor ;KEY_RIGHT

	If MouseZ() And oldZoomFactor<>MouseZ()
		If oldZoomFactor<MouseZ()
			theZoomFactor=theZoomFactor+0.1	
		Else
			theZoomFactor=theZoomFactor-0.1			
		EndIf
			If theZoomFactor>4.0
				theZoomFactor=4.0
			End If
			If theZoomFactor<0.2
				theZoomFactor=0.2
			End If
		oldZoomFactor=MouseZ()
	EndIf
	Color 255,255,255:Text 0,0,theZoomFactor

	updateObjs(MouseDown(1))

	Color 0,255,0
	Rect (GraphicsWidth()/2)-3,(GraphicsHeight()/2)-3,7*theZoomFactor,7*theZoomFactor
	Color 255,255,255:Text 0,0,theZoomFactor
	Text 0,10,"Press +/- on the numpad to zoom. Cursors to move"
	
Flip
Wend
End

Type obj
	Field x
	Field y
	Field dist#
End Type

Function Update(x,y,dist#)
	Local dx=(youX*theZoomFactor)-GraphicsWidth()/2  ;here you have forgotten the scalefactor
	Local dy=(youY*theZoomFactor)-GraphicsHeight()/2 ;here you have forgotten the scalefactor
	;SetScale 1,1
	Color 255,0,0
	If dist<50*theZoomFactor Then Color 255,255,0
	Rect ((x*theZoomFactor-3)-dx),((y*theZoomFactor-3)-dy),(7*theZoomFactor),(7*theZoomFactor)
	Text 10,lineInt,dist
	lineInt=lineInt+20
End Function

Function updateObjs(checkmouse)
	Local mx#=MouseX()
	Local my#=MouseY()
	Local dx=(youX*theZoomFactor)-GraphicsWidth()/2
	Local dy=(youY*theZoomFactor)-GraphicsHeight()/2
	Local xdiff#,ydiff#
	For i.obj=Each obj
		Update(i\x,i\y,i\dist#)
		If checkmouse Then
			xdiff=(mx)-(i\x*theZoomFactor-dx)
			ydiff=(my)-(i\y*theZoomFactor-dy)
			i\dist=Sqr((xdiff*xdiff)+(ydiff*ydiff))
		Else
			i\dist=1000
		EndIf
	Next
End Function


Cygnus
(Posted 20 years ago)
Why not change the code above, and post the max one in a new showcase? :)

Boiled Sweets
(Posted 20 years ago)
Dare I say it, erm it's a bit naff...

markcw
(Posted 20 years ago)
hehe. yeah it is a bit. i didn't know that until i had translated it. if you increase the scroll speed and number of clickable dots it might be better.

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