The most important thing here is how objects are drawn to the screen. Check out the 'draw' method of my 'obj' type.
Use the Mousewheel to zoom in / out, centered upong location of cursor. Click and drag to pan. Double clicking instantly zooms full-in on the mouse cursor.
I hope it is useful to somebody!
SuperStrict
Framework BRL.GLMax2D
Import BaH.Random
Import maxgui.drivers
Import BRL.PNGLoader
Import BRL.BMPLoader
Type obj
Global List:TList
Field X:Float
Field Y:Float
Field Size:Float
Field HalfSize:Float
Field R:Int
Field G:Int
Field B:Int
Method New()
X = Rand(0 , GW)
Y = Rand(0 , GH)
Size = Rnd(0 , 1)
Size = size^3
HalfSize = Size / 2.0
R = Rand(0,255)
G = Rand(0,255)
B = Rand(0 , 255)
If Not List Then List = New TList
List.AddLast(Self)
End Method
Method Draw(ZoomOriginX:Float,ZoomOriginY:Float,_VIEWSCALE:Float)
SetColor(r,g,b)
Local drawx:Float = ( (X - ZoomOriginX ) * _viewscale)
Local drawy:Float = ((Y- ZoomOriginY ) * _viewscale)
DrawRect(drawX-HalfSize,drawY-HalfSize,size+1,size+1)
End Method
End Type
Global GW:Int = ClientWidth(Desktop())
Global GH:Int = ClientHeight(Desktop())
Global GHW:Float = GW/2.0
Global GHH:Float = GH/2.0
Global Dragging:Byte = 0
Global MSX:Int
Global MSY:Int
Global MPosX:Int
Global MPosY:Int
Global DoubleClickTime:Int
Global DoubleClickDelay:Int = 300
Global Viewscale:Float = 1.0
Global WorldViewOriginX:Float = GHW
Global WorldViewOriginY:Float = GHH
Global ZoomTargetX:Float = GHW
Global ZoomTargetY:Float = GHH
Global ZoomTargetScale:Float = 1
Global ZoomFactor:Float = 1.25
Global ZoomMAX:Float = 30.0
Global ZoomMin:Float = 0.50
'Global RootDir:String = CurrentDir()
AddHook EmitEventHook, EventHook
SetGraphicsDriver(GLMax2DDriver() )
?Debug
Global GraphicsContext:TGraphics = CreateGraphics(GW , GH , 0 , 60 , Graphics_BACKBUFFER)
?Not Debug
Global GraphicsContext:TGraphics = CreateGraphics(GW , GH , 32 , 60 , Graphics_BACKBUFFER)
?
SetGraphics(GraphicsContext)
HideMouse()
For Local i:Int = 0 To 3000
Local temp:obj = New obj
Next
Local ms:Int,time:Int,dt:Float
While Not KeyHit(KEY_ESCAPE)
'ms = MilliSecs()
'dt = ms - time
'time = ms
'Print 1000.0/dt
Cls
SetScale(1 , 1)
SetOrigin(GHW,GHH)
SetColor(255 , 255 , 0)
SetLineWidth(5)
Local tempx:Float = (-WorldViewOriginX * viewscale)
Local tempy:Float = (-WorldViewOriginY * viewscale )
Local tempx2:Float = tempx+(GW*viewscale)
Local tempy2:Float = tempy+(GH*viewscale)
DrawLine(tempx , tempy , tempx2 , tempy)
DrawLine(tempx2, tempy , tempx2 , tempy2)
DrawLine(Tempx2 , tempy2 , tempx , tempy2)
DrawLine(tempx , tempy2 , tempx , tempy)
SetLineWidth(1)
SetColor(255 , 255 , 255)
SetViewScale()
For Local t:obj = EachIn Obj.List
t.draw(WorldViewOriginX, WorldViewOriginY, viewscale)
Next
SetScale(1 , 1)
SetOrigin(0 , 0)
SetBlend(LightBlend)
SetAlpha(0.4)
SetColor(255 , 155 , 0)
SetLineWidth(2)
DrawLine(MPosX- 15 , MPosY, MPosX+ 15 , MPosY)
DrawLine(MPosX, MPosY- 15 , MPosX, MPosY+ 15 )
SetLineWidth(1)
SetBlend(SolidBlend)
SetColor(255 , 255 , 255)
DrawText("SCALE: " + viewscale , 50 , 50)
Flip 0
Wend
Function SetViewScale()
WorldViewOriginX = ZoomTargetX
WorldViewOriginY = ZoomTargetY
ViewScale = ZoomTargetScale
SetScale(Viewscale , Viewscale)
End Function
Function ZoomIn(MouseScreenX:Int , MouseScreenY:Int)
If Not (ZoomTargetScale >= ZoomMax)
Local mx:Float = (MouseScreenX - GHW) /ZoomTargetScale
Local my:Float = (MouseScreenY - GHH) /ZoomTargetScale
Local z:Float = 1.0 - (1.0/ZoomFactor)
ZoomTargetX = (mx)*(z) + WorldViewOriginX
ZoomTargetY = (my)*(z) + WorldViewOriginY
If ZoomTargetX > GW
ZoomTargetX = GW
Else If ZoomTargetX < 0
ZoomTargetX = 0
EndIf
If ZoomTargetY > GH
ZoomTargetY = GH
Else If ZoomTargetY < 0
ZoomTargetY = 0
EndIf
ZoomTargetScale:* ZoomFactor
If ZoomTargetScale > ZoomMax Then ZoomTargetScale = ZoomMax
EndIf
End Function
Function ZoomOut(MouseScreenX:Int , MouseScreenY:Int)
If Not (ZoomTargetScale =< ZoomMin)
Local mx:Float = (MouseScreenX - GHW) / ZoomTargetScale
Local my:Float = (MouseScreenY - GHH) / ZoomTargetScale
Local z:Float = 1.0 - ZoomFactor
ZoomTargetX = mx*(z)+ WorldViewOriginX
ZoomTargetY = my*(z)+ WorldViewOriginY
ZoomTargetScale:/ ZoomFactor
If ZoomTargetScale < ZoomMin Then ZoomTargetScale = ZoomMin
EndIf
End Function
Function DoubleClick(button:Int , MouseScreenX:Int , MouseScreenY:Int)
ZoomTargetX = WorldViewOriginX + (MouseScreenX - GHW) / ZoomTargetScale
ZoomTargetY = WorldViewOriginY + (MouseScreenY - GHH) / ZoomTargetScale
ZoomTargetScale = ZoomMax
End Function
Function Drag(MouseScreenX:Int , MouseScreenY:Int)
Local dx:Float = (MouseScreenX - MSX) / viewscale
Local dy:Float = (MouseScreenY - MSY) / viewscale
WorldViewOriginX:- dx
WorldViewOriginY:- dy
ZoomTargetX:- dx
ZoomTargetY:- dy
MSX = MouseScreenX
MSY = MouseScreenY
If WorldViewOriginX < 0
WorldViewOriginX = 0
ZoomTargetX = 0
Else If WorldViewOriginX > GW
WorldViewOriginX = GW
ZoomTargetX = GW
EndIf
If WorldViewOriginY < 0
WorldViewOriginY = 0
ZoomTargetY = 0
Else If WorldViewOriginY > GH
WorldViewOriginY = GH
ZoomTargetY = GH
EndIf
End Function
Function EventHook:Object(ID:Int , Data:Object , Context:Object)
Local Event:TEvent = TEvent(data)
If Event = Null Then Return event
Select event.id
Case EVENT_MOUSEWHEEL
If Event.Data > 0
ZoomIn(event.x,Event.Y)
Else
ZoomOut(event.x,Event.Y)
EndIf
Case EVENT_APPTERMINATE
End
Case EVENT_KEYDOWN
Select Event.Data
Case KEY_ESCAPE End
End Select
Case EVENT_MOUSEDOWN
Local ms:Int = MilliSecs()
If ms - DoubleClickTime =< DoubleClickDelay
DoubleClick(event.Data , event.X , event.Y)
Return Null
Else DoubleClickTime = ms
EndIf
Select Event.data
Case 1
Dragging = 1
MSX = Event.X
MSY = Event.Y
Case 3
Dragging = 1
MSX = Event.X
MSY = Event.Y
End Select
Case EVENT_MOUSEUP
Select Event.data
Case 1,3
Dragging = 0
End Select
Case EVENT_MOUSEMOVE
MPosx = Event.x
MPosY = Event.y
If Dragging
Drag(event.x,event.y)
EndIf
End Select
End Function
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